4134 lines
121 KiB
C
4134 lines
121 KiB
C
/*
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* Copyright (c) 2000-2006 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#include <linux/log2.h>
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#include "xfs.h"
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#include "xfs_fs.h"
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#include "xfs_types.h"
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#include "xfs_bit.h"
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#include "xfs_log.h"
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#include "xfs_inum.h"
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#include "xfs_trans.h"
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#include "xfs_trans_priv.h"
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#include "xfs_sb.h"
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#include "xfs_ag.h"
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#include "xfs_mount.h"
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#include "xfs_bmap_btree.h"
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#include "xfs_alloc_btree.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_attr_sf.h"
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#include "xfs_dinode.h"
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#include "xfs_inode.h"
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#include "xfs_buf_item.h"
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#include "xfs_inode_item.h"
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#include "xfs_btree.h"
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#include "xfs_btree_trace.h"
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#include "xfs_alloc.h"
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#include "xfs_ialloc.h"
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#include "xfs_bmap.h"
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#include "xfs_error.h"
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#include "xfs_utils.h"
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#include "xfs_quota.h"
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#include "xfs_filestream.h"
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#include "xfs_vnodeops.h"
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#include "xfs_trace.h"
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kmem_zone_t *xfs_ifork_zone;
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kmem_zone_t *xfs_inode_zone;
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/*
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* Used in xfs_itruncate(). This is the maximum number of extents
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* freed from a file in a single transaction.
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*/
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#define XFS_ITRUNC_MAX_EXTENTS 2
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STATIC int xfs_iflush_int(xfs_inode_t *, xfs_buf_t *);
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STATIC int xfs_iformat_local(xfs_inode_t *, xfs_dinode_t *, int, int);
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STATIC int xfs_iformat_extents(xfs_inode_t *, xfs_dinode_t *, int);
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STATIC int xfs_iformat_btree(xfs_inode_t *, xfs_dinode_t *, int);
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#ifdef DEBUG
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/*
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* Make sure that the extents in the given memory buffer
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* are valid.
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*/
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STATIC void
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xfs_validate_extents(
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xfs_ifork_t *ifp,
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int nrecs,
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xfs_exntfmt_t fmt)
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{
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xfs_bmbt_irec_t irec;
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xfs_bmbt_rec_host_t rec;
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int i;
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for (i = 0; i < nrecs; i++) {
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xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
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rec.l0 = get_unaligned(&ep->l0);
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rec.l1 = get_unaligned(&ep->l1);
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xfs_bmbt_get_all(&rec, &irec);
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if (fmt == XFS_EXTFMT_NOSTATE)
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ASSERT(irec.br_state == XFS_EXT_NORM);
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}
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}
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#else /* DEBUG */
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#define xfs_validate_extents(ifp, nrecs, fmt)
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#endif /* DEBUG */
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/*
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* Check that none of the inode's in the buffer have a next
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* unlinked field of 0.
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*/
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#if defined(DEBUG)
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void
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xfs_inobp_check(
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xfs_mount_t *mp,
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xfs_buf_t *bp)
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{
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int i;
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int j;
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xfs_dinode_t *dip;
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j = mp->m_inode_cluster_size >> mp->m_sb.sb_inodelog;
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for (i = 0; i < j; i++) {
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dip = (xfs_dinode_t *)xfs_buf_offset(bp,
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i * mp->m_sb.sb_inodesize);
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if (!dip->di_next_unlinked) {
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xfs_alert(mp,
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"Detected bogus zero next_unlinked field in incore inode buffer 0x%p.",
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bp);
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ASSERT(dip->di_next_unlinked);
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}
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}
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}
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#endif
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/*
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* Find the buffer associated with the given inode map
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* We do basic validation checks on the buffer once it has been
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* retrieved from disk.
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*/
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STATIC int
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xfs_imap_to_bp(
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xfs_mount_t *mp,
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xfs_trans_t *tp,
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struct xfs_imap *imap,
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xfs_buf_t **bpp,
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uint buf_flags,
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uint iget_flags)
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{
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int error;
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int i;
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int ni;
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xfs_buf_t *bp;
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error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, imap->im_blkno,
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(int)imap->im_len, buf_flags, &bp);
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if (error) {
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if (error != EAGAIN) {
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xfs_warn(mp,
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"%s: xfs_trans_read_buf() returned error %d.",
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__func__, error);
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} else {
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ASSERT(buf_flags & XBF_TRYLOCK);
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}
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return error;
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}
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/*
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* Validate the magic number and version of every inode in the buffer
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* (if DEBUG kernel) or the first inode in the buffer, otherwise.
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*/
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#ifdef DEBUG
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ni = BBTOB(imap->im_len) >> mp->m_sb.sb_inodelog;
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#else /* usual case */
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ni = 1;
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#endif
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for (i = 0; i < ni; i++) {
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int di_ok;
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xfs_dinode_t *dip;
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dip = (xfs_dinode_t *)xfs_buf_offset(bp,
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(i << mp->m_sb.sb_inodelog));
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di_ok = be16_to_cpu(dip->di_magic) == XFS_DINODE_MAGIC &&
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XFS_DINODE_GOOD_VERSION(dip->di_version);
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if (unlikely(XFS_TEST_ERROR(!di_ok, mp,
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XFS_ERRTAG_ITOBP_INOTOBP,
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XFS_RANDOM_ITOBP_INOTOBP))) {
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if (iget_flags & XFS_IGET_UNTRUSTED) {
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xfs_trans_brelse(tp, bp);
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return XFS_ERROR(EINVAL);
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}
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XFS_CORRUPTION_ERROR("xfs_imap_to_bp",
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XFS_ERRLEVEL_HIGH, mp, dip);
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#ifdef DEBUG
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xfs_emerg(mp,
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"bad inode magic/vsn daddr %lld #%d (magic=%x)",
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(unsigned long long)imap->im_blkno, i,
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be16_to_cpu(dip->di_magic));
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ASSERT(0);
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#endif
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xfs_trans_brelse(tp, bp);
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return XFS_ERROR(EFSCORRUPTED);
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}
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}
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xfs_inobp_check(mp, bp);
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/*
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* Mark the buffer as an inode buffer now that it looks good
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*/
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XFS_BUF_SET_VTYPE(bp, B_FS_INO);
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*bpp = bp;
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return 0;
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}
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/*
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* This routine is called to map an inode number within a file
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* system to the buffer containing the on-disk version of the
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* inode. It returns a pointer to the buffer containing the
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* on-disk inode in the bpp parameter, and in the dip parameter
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* it returns a pointer to the on-disk inode within that buffer.
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*
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* If a non-zero error is returned, then the contents of bpp and
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* dipp are undefined.
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*
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* Use xfs_imap() to determine the size and location of the
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* buffer to read from disk.
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*/
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int
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xfs_inotobp(
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xfs_mount_t *mp,
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xfs_trans_t *tp,
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xfs_ino_t ino,
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xfs_dinode_t **dipp,
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xfs_buf_t **bpp,
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int *offset,
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uint imap_flags)
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{
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struct xfs_imap imap;
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xfs_buf_t *bp;
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int error;
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imap.im_blkno = 0;
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error = xfs_imap(mp, tp, ino, &imap, imap_flags);
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if (error)
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return error;
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error = xfs_imap_to_bp(mp, tp, &imap, &bp, XBF_LOCK, imap_flags);
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if (error)
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return error;
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*dipp = (xfs_dinode_t *)xfs_buf_offset(bp, imap.im_boffset);
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*bpp = bp;
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*offset = imap.im_boffset;
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return 0;
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}
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/*
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* This routine is called to map an inode to the buffer containing
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* the on-disk version of the inode. It returns a pointer to the
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* buffer containing the on-disk inode in the bpp parameter, and in
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* the dip parameter it returns a pointer to the on-disk inode within
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* that buffer.
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*
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* If a non-zero error is returned, then the contents of bpp and
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* dipp are undefined.
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*
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* The inode is expected to already been mapped to its buffer and read
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* in once, thus we can use the mapping information stored in the inode
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* rather than calling xfs_imap(). This allows us to avoid the overhead
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* of looking at the inode btree for small block file systems
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* (see xfs_imap()).
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*/
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int
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xfs_itobp(
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xfs_mount_t *mp,
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xfs_trans_t *tp,
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xfs_inode_t *ip,
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xfs_dinode_t **dipp,
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xfs_buf_t **bpp,
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uint buf_flags)
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{
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xfs_buf_t *bp;
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int error;
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ASSERT(ip->i_imap.im_blkno != 0);
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error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp, buf_flags, 0);
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if (error)
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return error;
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if (!bp) {
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ASSERT(buf_flags & XBF_TRYLOCK);
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ASSERT(tp == NULL);
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*bpp = NULL;
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return EAGAIN;
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}
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*dipp = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
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*bpp = bp;
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return 0;
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}
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/*
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* Move inode type and inode format specific information from the
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* on-disk inode to the in-core inode. For fifos, devs, and sockets
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* this means set if_rdev to the proper value. For files, directories,
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* and symlinks this means to bring in the in-line data or extent
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* pointers. For a file in B-tree format, only the root is immediately
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* brought in-core. The rest will be in-lined in if_extents when it
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* is first referenced (see xfs_iread_extents()).
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*/
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STATIC int
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xfs_iformat(
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xfs_inode_t *ip,
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xfs_dinode_t *dip)
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{
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xfs_attr_shortform_t *atp;
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int size;
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int error;
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xfs_fsize_t di_size;
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ip->i_df.if_ext_max =
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XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
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error = 0;
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if (unlikely(be32_to_cpu(dip->di_nextents) +
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be16_to_cpu(dip->di_anextents) >
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be64_to_cpu(dip->di_nblocks))) {
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xfs_warn(ip->i_mount,
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"corrupt dinode %Lu, extent total = %d, nblocks = %Lu.",
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(unsigned long long)ip->i_ino,
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(int)(be32_to_cpu(dip->di_nextents) +
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be16_to_cpu(dip->di_anextents)),
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(unsigned long long)
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be64_to_cpu(dip->di_nblocks));
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XFS_CORRUPTION_ERROR("xfs_iformat(1)", XFS_ERRLEVEL_LOW,
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ip->i_mount, dip);
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return XFS_ERROR(EFSCORRUPTED);
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}
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if (unlikely(dip->di_forkoff > ip->i_mount->m_sb.sb_inodesize)) {
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xfs_warn(ip->i_mount, "corrupt dinode %Lu, forkoff = 0x%x.",
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(unsigned long long)ip->i_ino,
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dip->di_forkoff);
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XFS_CORRUPTION_ERROR("xfs_iformat(2)", XFS_ERRLEVEL_LOW,
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ip->i_mount, dip);
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return XFS_ERROR(EFSCORRUPTED);
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}
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if (unlikely((ip->i_d.di_flags & XFS_DIFLAG_REALTIME) &&
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!ip->i_mount->m_rtdev_targp)) {
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xfs_warn(ip->i_mount,
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"corrupt dinode %Lu, has realtime flag set.",
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ip->i_ino);
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XFS_CORRUPTION_ERROR("xfs_iformat(realtime)",
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XFS_ERRLEVEL_LOW, ip->i_mount, dip);
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return XFS_ERROR(EFSCORRUPTED);
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}
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switch (ip->i_d.di_mode & S_IFMT) {
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case S_IFIFO:
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case S_IFCHR:
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case S_IFBLK:
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case S_IFSOCK:
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if (unlikely(dip->di_format != XFS_DINODE_FMT_DEV)) {
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XFS_CORRUPTION_ERROR("xfs_iformat(3)", XFS_ERRLEVEL_LOW,
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ip->i_mount, dip);
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return XFS_ERROR(EFSCORRUPTED);
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}
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ip->i_d.di_size = 0;
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ip->i_size = 0;
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ip->i_df.if_u2.if_rdev = xfs_dinode_get_rdev(dip);
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break;
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case S_IFREG:
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case S_IFLNK:
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case S_IFDIR:
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switch (dip->di_format) {
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case XFS_DINODE_FMT_LOCAL:
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/*
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* no local regular files yet
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*/
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if (unlikely((be16_to_cpu(dip->di_mode) & S_IFMT) == S_IFREG)) {
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xfs_warn(ip->i_mount,
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"corrupt inode %Lu (local format for regular file).",
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(unsigned long long) ip->i_ino);
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XFS_CORRUPTION_ERROR("xfs_iformat(4)",
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XFS_ERRLEVEL_LOW,
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ip->i_mount, dip);
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return XFS_ERROR(EFSCORRUPTED);
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}
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di_size = be64_to_cpu(dip->di_size);
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if (unlikely(di_size > XFS_DFORK_DSIZE(dip, ip->i_mount))) {
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xfs_warn(ip->i_mount,
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"corrupt inode %Lu (bad size %Ld for local inode).",
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(unsigned long long) ip->i_ino,
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(long long) di_size);
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XFS_CORRUPTION_ERROR("xfs_iformat(5)",
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XFS_ERRLEVEL_LOW,
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ip->i_mount, dip);
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return XFS_ERROR(EFSCORRUPTED);
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}
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size = (int)di_size;
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error = xfs_iformat_local(ip, dip, XFS_DATA_FORK, size);
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break;
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case XFS_DINODE_FMT_EXTENTS:
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error = xfs_iformat_extents(ip, dip, XFS_DATA_FORK);
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break;
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case XFS_DINODE_FMT_BTREE:
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error = xfs_iformat_btree(ip, dip, XFS_DATA_FORK);
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break;
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default:
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XFS_ERROR_REPORT("xfs_iformat(6)", XFS_ERRLEVEL_LOW,
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ip->i_mount);
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return XFS_ERROR(EFSCORRUPTED);
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}
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break;
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default:
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XFS_ERROR_REPORT("xfs_iformat(7)", XFS_ERRLEVEL_LOW, ip->i_mount);
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return XFS_ERROR(EFSCORRUPTED);
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}
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if (error) {
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return error;
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}
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if (!XFS_DFORK_Q(dip))
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return 0;
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ASSERT(ip->i_afp == NULL);
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ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP | KM_NOFS);
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ip->i_afp->if_ext_max =
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XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
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switch (dip->di_aformat) {
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case XFS_DINODE_FMT_LOCAL:
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atp = (xfs_attr_shortform_t *)XFS_DFORK_APTR(dip);
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size = be16_to_cpu(atp->hdr.totsize);
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|
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if (unlikely(size < sizeof(struct xfs_attr_sf_hdr))) {
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xfs_warn(ip->i_mount,
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"corrupt inode %Lu (bad attr fork size %Ld).",
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(unsigned long long) ip->i_ino,
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(long long) size);
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XFS_CORRUPTION_ERROR("xfs_iformat(8)",
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XFS_ERRLEVEL_LOW,
|
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ip->i_mount, dip);
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return XFS_ERROR(EFSCORRUPTED);
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}
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error = xfs_iformat_local(ip, dip, XFS_ATTR_FORK, size);
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break;
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case XFS_DINODE_FMT_EXTENTS:
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error = xfs_iformat_extents(ip, dip, XFS_ATTR_FORK);
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break;
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case XFS_DINODE_FMT_BTREE:
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error = xfs_iformat_btree(ip, dip, XFS_ATTR_FORK);
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break;
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default:
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error = XFS_ERROR(EFSCORRUPTED);
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break;
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}
|
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if (error) {
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kmem_zone_free(xfs_ifork_zone, ip->i_afp);
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ip->i_afp = NULL;
|
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xfs_idestroy_fork(ip, XFS_DATA_FORK);
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}
|
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return error;
|
|
}
|
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|
|
/*
|
|
* The file is in-lined in the on-disk inode.
|
|
* If it fits into if_inline_data, then copy
|
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* it there, otherwise allocate a buffer for it
|
|
* and copy the data there. Either way, set
|
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* if_data to point at the data.
|
|
* If we allocate a buffer for the data, make
|
|
* sure that its size is a multiple of 4 and
|
|
* record the real size in i_real_bytes.
|
|
*/
|
|
STATIC int
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xfs_iformat_local(
|
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xfs_inode_t *ip,
|
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xfs_dinode_t *dip,
|
|
int whichfork,
|
|
int size)
|
|
{
|
|
xfs_ifork_t *ifp;
|
|
int real_size;
|
|
|
|
/*
|
|
* If the size is unreasonable, then something
|
|
* is wrong and we just bail out rather than crash in
|
|
* kmem_alloc() or memcpy() below.
|
|
*/
|
|
if (unlikely(size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
|
|
xfs_warn(ip->i_mount,
|
|
"corrupt inode %Lu (bad size %d for local fork, size = %d).",
|
|
(unsigned long long) ip->i_ino, size,
|
|
XFS_DFORK_SIZE(dip, ip->i_mount, whichfork));
|
|
XFS_CORRUPTION_ERROR("xfs_iformat_local", XFS_ERRLEVEL_LOW,
|
|
ip->i_mount, dip);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
real_size = 0;
|
|
if (size == 0)
|
|
ifp->if_u1.if_data = NULL;
|
|
else if (size <= sizeof(ifp->if_u2.if_inline_data))
|
|
ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
|
|
else {
|
|
real_size = roundup(size, 4);
|
|
ifp->if_u1.if_data = kmem_alloc(real_size, KM_SLEEP | KM_NOFS);
|
|
}
|
|
ifp->if_bytes = size;
|
|
ifp->if_real_bytes = real_size;
|
|
if (size)
|
|
memcpy(ifp->if_u1.if_data, XFS_DFORK_PTR(dip, whichfork), size);
|
|
ifp->if_flags &= ~XFS_IFEXTENTS;
|
|
ifp->if_flags |= XFS_IFINLINE;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The file consists of a set of extents all
|
|
* of which fit into the on-disk inode.
|
|
* If there are few enough extents to fit into
|
|
* the if_inline_ext, then copy them there.
|
|
* Otherwise allocate a buffer for them and copy
|
|
* them into it. Either way, set if_extents
|
|
* to point at the extents.
|
|
*/
|
|
STATIC int
|
|
xfs_iformat_extents(
|
|
xfs_inode_t *ip,
|
|
xfs_dinode_t *dip,
|
|
int whichfork)
|
|
{
|
|
xfs_bmbt_rec_t *dp;
|
|
xfs_ifork_t *ifp;
|
|
int nex;
|
|
int size;
|
|
int i;
|
|
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
nex = XFS_DFORK_NEXTENTS(dip, whichfork);
|
|
size = nex * (uint)sizeof(xfs_bmbt_rec_t);
|
|
|
|
/*
|
|
* If the number of extents is unreasonable, then something
|
|
* is wrong and we just bail out rather than crash in
|
|
* kmem_alloc() or memcpy() below.
|
|
*/
|
|
if (unlikely(size < 0 || size > XFS_DFORK_SIZE(dip, ip->i_mount, whichfork))) {
|
|
xfs_warn(ip->i_mount, "corrupt inode %Lu ((a)extents = %d).",
|
|
(unsigned long long) ip->i_ino, nex);
|
|
XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW,
|
|
ip->i_mount, dip);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
ifp->if_real_bytes = 0;
|
|
if (nex == 0)
|
|
ifp->if_u1.if_extents = NULL;
|
|
else if (nex <= XFS_INLINE_EXTS)
|
|
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
|
|
else
|
|
xfs_iext_add(ifp, 0, nex);
|
|
|
|
ifp->if_bytes = size;
|
|
if (size) {
|
|
dp = (xfs_bmbt_rec_t *) XFS_DFORK_PTR(dip, whichfork);
|
|
xfs_validate_extents(ifp, nex, XFS_EXTFMT_INODE(ip));
|
|
for (i = 0; i < nex; i++, dp++) {
|
|
xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
|
|
ep->l0 = get_unaligned_be64(&dp->l0);
|
|
ep->l1 = get_unaligned_be64(&dp->l1);
|
|
}
|
|
XFS_BMAP_TRACE_EXLIST(ip, nex, whichfork);
|
|
if (whichfork != XFS_DATA_FORK ||
|
|
XFS_EXTFMT_INODE(ip) == XFS_EXTFMT_NOSTATE)
|
|
if (unlikely(xfs_check_nostate_extents(
|
|
ifp, 0, nex))) {
|
|
XFS_ERROR_REPORT("xfs_iformat_extents(2)",
|
|
XFS_ERRLEVEL_LOW,
|
|
ip->i_mount);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
}
|
|
ifp->if_flags |= XFS_IFEXTENTS;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* The file has too many extents to fit into
|
|
* the inode, so they are in B-tree format.
|
|
* Allocate a buffer for the root of the B-tree
|
|
* and copy the root into it. The i_extents
|
|
* field will remain NULL until all of the
|
|
* extents are read in (when they are needed).
|
|
*/
|
|
STATIC int
|
|
xfs_iformat_btree(
|
|
xfs_inode_t *ip,
|
|
xfs_dinode_t *dip,
|
|
int whichfork)
|
|
{
|
|
xfs_bmdr_block_t *dfp;
|
|
xfs_ifork_t *ifp;
|
|
/* REFERENCED */
|
|
int nrecs;
|
|
int size;
|
|
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
dfp = (xfs_bmdr_block_t *)XFS_DFORK_PTR(dip, whichfork);
|
|
size = XFS_BMAP_BROOT_SPACE(dfp);
|
|
nrecs = be16_to_cpu(dfp->bb_numrecs);
|
|
|
|
/*
|
|
* blow out if -- fork has less extents than can fit in
|
|
* fork (fork shouldn't be a btree format), root btree
|
|
* block has more records than can fit into the fork,
|
|
* or the number of extents is greater than the number of
|
|
* blocks.
|
|
*/
|
|
if (unlikely(XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max
|
|
|| XFS_BMDR_SPACE_CALC(nrecs) >
|
|
XFS_DFORK_SIZE(dip, ip->i_mount, whichfork)
|
|
|| XFS_IFORK_NEXTENTS(ip, whichfork) > ip->i_d.di_nblocks)) {
|
|
xfs_warn(ip->i_mount, "corrupt inode %Lu (btree).",
|
|
(unsigned long long) ip->i_ino);
|
|
XFS_CORRUPTION_ERROR("xfs_iformat_btree", XFS_ERRLEVEL_LOW,
|
|
ip->i_mount, dip);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
ifp->if_broot_bytes = size;
|
|
ifp->if_broot = kmem_alloc(size, KM_SLEEP | KM_NOFS);
|
|
ASSERT(ifp->if_broot != NULL);
|
|
/*
|
|
* Copy and convert from the on-disk structure
|
|
* to the in-memory structure.
|
|
*/
|
|
xfs_bmdr_to_bmbt(ip->i_mount, dfp,
|
|
XFS_DFORK_SIZE(dip, ip->i_mount, whichfork),
|
|
ifp->if_broot, size);
|
|
ifp->if_flags &= ~XFS_IFEXTENTS;
|
|
ifp->if_flags |= XFS_IFBROOT;
|
|
|
|
return 0;
|
|
}
|
|
|
|
STATIC void
|
|
xfs_dinode_from_disk(
|
|
xfs_icdinode_t *to,
|
|
xfs_dinode_t *from)
|
|
{
|
|
to->di_magic = be16_to_cpu(from->di_magic);
|
|
to->di_mode = be16_to_cpu(from->di_mode);
|
|
to->di_version = from ->di_version;
|
|
to->di_format = from->di_format;
|
|
to->di_onlink = be16_to_cpu(from->di_onlink);
|
|
to->di_uid = be32_to_cpu(from->di_uid);
|
|
to->di_gid = be32_to_cpu(from->di_gid);
|
|
to->di_nlink = be32_to_cpu(from->di_nlink);
|
|
to->di_projid_lo = be16_to_cpu(from->di_projid_lo);
|
|
to->di_projid_hi = be16_to_cpu(from->di_projid_hi);
|
|
memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
|
|
to->di_flushiter = be16_to_cpu(from->di_flushiter);
|
|
to->di_atime.t_sec = be32_to_cpu(from->di_atime.t_sec);
|
|
to->di_atime.t_nsec = be32_to_cpu(from->di_atime.t_nsec);
|
|
to->di_mtime.t_sec = be32_to_cpu(from->di_mtime.t_sec);
|
|
to->di_mtime.t_nsec = be32_to_cpu(from->di_mtime.t_nsec);
|
|
to->di_ctime.t_sec = be32_to_cpu(from->di_ctime.t_sec);
|
|
to->di_ctime.t_nsec = be32_to_cpu(from->di_ctime.t_nsec);
|
|
to->di_size = be64_to_cpu(from->di_size);
|
|
to->di_nblocks = be64_to_cpu(from->di_nblocks);
|
|
to->di_extsize = be32_to_cpu(from->di_extsize);
|
|
to->di_nextents = be32_to_cpu(from->di_nextents);
|
|
to->di_anextents = be16_to_cpu(from->di_anextents);
|
|
to->di_forkoff = from->di_forkoff;
|
|
to->di_aformat = from->di_aformat;
|
|
to->di_dmevmask = be32_to_cpu(from->di_dmevmask);
|
|
to->di_dmstate = be16_to_cpu(from->di_dmstate);
|
|
to->di_flags = be16_to_cpu(from->di_flags);
|
|
to->di_gen = be32_to_cpu(from->di_gen);
|
|
}
|
|
|
|
void
|
|
xfs_dinode_to_disk(
|
|
xfs_dinode_t *to,
|
|
xfs_icdinode_t *from)
|
|
{
|
|
to->di_magic = cpu_to_be16(from->di_magic);
|
|
to->di_mode = cpu_to_be16(from->di_mode);
|
|
to->di_version = from ->di_version;
|
|
to->di_format = from->di_format;
|
|
to->di_onlink = cpu_to_be16(from->di_onlink);
|
|
to->di_uid = cpu_to_be32(from->di_uid);
|
|
to->di_gid = cpu_to_be32(from->di_gid);
|
|
to->di_nlink = cpu_to_be32(from->di_nlink);
|
|
to->di_projid_lo = cpu_to_be16(from->di_projid_lo);
|
|
to->di_projid_hi = cpu_to_be16(from->di_projid_hi);
|
|
memcpy(to->di_pad, from->di_pad, sizeof(to->di_pad));
|
|
to->di_flushiter = cpu_to_be16(from->di_flushiter);
|
|
to->di_atime.t_sec = cpu_to_be32(from->di_atime.t_sec);
|
|
to->di_atime.t_nsec = cpu_to_be32(from->di_atime.t_nsec);
|
|
to->di_mtime.t_sec = cpu_to_be32(from->di_mtime.t_sec);
|
|
to->di_mtime.t_nsec = cpu_to_be32(from->di_mtime.t_nsec);
|
|
to->di_ctime.t_sec = cpu_to_be32(from->di_ctime.t_sec);
|
|
to->di_ctime.t_nsec = cpu_to_be32(from->di_ctime.t_nsec);
|
|
to->di_size = cpu_to_be64(from->di_size);
|
|
to->di_nblocks = cpu_to_be64(from->di_nblocks);
|
|
to->di_extsize = cpu_to_be32(from->di_extsize);
|
|
to->di_nextents = cpu_to_be32(from->di_nextents);
|
|
to->di_anextents = cpu_to_be16(from->di_anextents);
|
|
to->di_forkoff = from->di_forkoff;
|
|
to->di_aformat = from->di_aformat;
|
|
to->di_dmevmask = cpu_to_be32(from->di_dmevmask);
|
|
to->di_dmstate = cpu_to_be16(from->di_dmstate);
|
|
to->di_flags = cpu_to_be16(from->di_flags);
|
|
to->di_gen = cpu_to_be32(from->di_gen);
|
|
}
|
|
|
|
STATIC uint
|
|
_xfs_dic2xflags(
|
|
__uint16_t di_flags)
|
|
{
|
|
uint flags = 0;
|
|
|
|
if (di_flags & XFS_DIFLAG_ANY) {
|
|
if (di_flags & XFS_DIFLAG_REALTIME)
|
|
flags |= XFS_XFLAG_REALTIME;
|
|
if (di_flags & XFS_DIFLAG_PREALLOC)
|
|
flags |= XFS_XFLAG_PREALLOC;
|
|
if (di_flags & XFS_DIFLAG_IMMUTABLE)
|
|
flags |= XFS_XFLAG_IMMUTABLE;
|
|
if (di_flags & XFS_DIFLAG_APPEND)
|
|
flags |= XFS_XFLAG_APPEND;
|
|
if (di_flags & XFS_DIFLAG_SYNC)
|
|
flags |= XFS_XFLAG_SYNC;
|
|
if (di_flags & XFS_DIFLAG_NOATIME)
|
|
flags |= XFS_XFLAG_NOATIME;
|
|
if (di_flags & XFS_DIFLAG_NODUMP)
|
|
flags |= XFS_XFLAG_NODUMP;
|
|
if (di_flags & XFS_DIFLAG_RTINHERIT)
|
|
flags |= XFS_XFLAG_RTINHERIT;
|
|
if (di_flags & XFS_DIFLAG_PROJINHERIT)
|
|
flags |= XFS_XFLAG_PROJINHERIT;
|
|
if (di_flags & XFS_DIFLAG_NOSYMLINKS)
|
|
flags |= XFS_XFLAG_NOSYMLINKS;
|
|
if (di_flags & XFS_DIFLAG_EXTSIZE)
|
|
flags |= XFS_XFLAG_EXTSIZE;
|
|
if (di_flags & XFS_DIFLAG_EXTSZINHERIT)
|
|
flags |= XFS_XFLAG_EXTSZINHERIT;
|
|
if (di_flags & XFS_DIFLAG_NODEFRAG)
|
|
flags |= XFS_XFLAG_NODEFRAG;
|
|
if (di_flags & XFS_DIFLAG_FILESTREAM)
|
|
flags |= XFS_XFLAG_FILESTREAM;
|
|
}
|
|
|
|
return flags;
|
|
}
|
|
|
|
uint
|
|
xfs_ip2xflags(
|
|
xfs_inode_t *ip)
|
|
{
|
|
xfs_icdinode_t *dic = &ip->i_d;
|
|
|
|
return _xfs_dic2xflags(dic->di_flags) |
|
|
(XFS_IFORK_Q(ip) ? XFS_XFLAG_HASATTR : 0);
|
|
}
|
|
|
|
uint
|
|
xfs_dic2xflags(
|
|
xfs_dinode_t *dip)
|
|
{
|
|
return _xfs_dic2xflags(be16_to_cpu(dip->di_flags)) |
|
|
(XFS_DFORK_Q(dip) ? XFS_XFLAG_HASATTR : 0);
|
|
}
|
|
|
|
/*
|
|
* Read the disk inode attributes into the in-core inode structure.
|
|
*/
|
|
int
|
|
xfs_iread(
|
|
xfs_mount_t *mp,
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *ip,
|
|
uint iget_flags)
|
|
{
|
|
xfs_buf_t *bp;
|
|
xfs_dinode_t *dip;
|
|
int error;
|
|
|
|
/*
|
|
* Fill in the location information in the in-core inode.
|
|
*/
|
|
error = xfs_imap(mp, tp, ip->i_ino, &ip->i_imap, iget_flags);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Get pointers to the on-disk inode and the buffer containing it.
|
|
*/
|
|
error = xfs_imap_to_bp(mp, tp, &ip->i_imap, &bp,
|
|
XBF_LOCK, iget_flags);
|
|
if (error)
|
|
return error;
|
|
dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
|
|
|
|
/*
|
|
* If we got something that isn't an inode it means someone
|
|
* (nfs or dmi) has a stale handle.
|
|
*/
|
|
if (be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC) {
|
|
#ifdef DEBUG
|
|
xfs_alert(mp,
|
|
"%s: dip->di_magic (0x%x) != XFS_DINODE_MAGIC (0x%x)",
|
|
__func__, be16_to_cpu(dip->di_magic), XFS_DINODE_MAGIC);
|
|
#endif /* DEBUG */
|
|
error = XFS_ERROR(EINVAL);
|
|
goto out_brelse;
|
|
}
|
|
|
|
/*
|
|
* If the on-disk inode is already linked to a directory
|
|
* entry, copy all of the inode into the in-core inode.
|
|
* xfs_iformat() handles copying in the inode format
|
|
* specific information.
|
|
* Otherwise, just get the truly permanent information.
|
|
*/
|
|
if (dip->di_mode) {
|
|
xfs_dinode_from_disk(&ip->i_d, dip);
|
|
error = xfs_iformat(ip, dip);
|
|
if (error) {
|
|
#ifdef DEBUG
|
|
xfs_alert(mp, "%s: xfs_iformat() returned error %d",
|
|
__func__, error);
|
|
#endif /* DEBUG */
|
|
goto out_brelse;
|
|
}
|
|
} else {
|
|
ip->i_d.di_magic = be16_to_cpu(dip->di_magic);
|
|
ip->i_d.di_version = dip->di_version;
|
|
ip->i_d.di_gen = be32_to_cpu(dip->di_gen);
|
|
ip->i_d.di_flushiter = be16_to_cpu(dip->di_flushiter);
|
|
/*
|
|
* Make sure to pull in the mode here as well in
|
|
* case the inode is released without being used.
|
|
* This ensures that xfs_inactive() will see that
|
|
* the inode is already free and not try to mess
|
|
* with the uninitialized part of it.
|
|
*/
|
|
ip->i_d.di_mode = 0;
|
|
/*
|
|
* Initialize the per-fork minima and maxima for a new
|
|
* inode here. xfs_iformat will do it for old inodes.
|
|
*/
|
|
ip->i_df.if_ext_max =
|
|
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
|
|
}
|
|
|
|
/*
|
|
* The inode format changed when we moved the link count and
|
|
* made it 32 bits long. If this is an old format inode,
|
|
* convert it in memory to look like a new one. If it gets
|
|
* flushed to disk we will convert back before flushing or
|
|
* logging it. We zero out the new projid field and the old link
|
|
* count field. We'll handle clearing the pad field (the remains
|
|
* of the old uuid field) when we actually convert the inode to
|
|
* the new format. We don't change the version number so that we
|
|
* can distinguish this from a real new format inode.
|
|
*/
|
|
if (ip->i_d.di_version == 1) {
|
|
ip->i_d.di_nlink = ip->i_d.di_onlink;
|
|
ip->i_d.di_onlink = 0;
|
|
xfs_set_projid(ip, 0);
|
|
}
|
|
|
|
ip->i_delayed_blks = 0;
|
|
ip->i_size = ip->i_d.di_size;
|
|
|
|
/*
|
|
* Mark the buffer containing the inode as something to keep
|
|
* around for a while. This helps to keep recently accessed
|
|
* meta-data in-core longer.
|
|
*/
|
|
xfs_buf_set_ref(bp, XFS_INO_REF);
|
|
|
|
/*
|
|
* Use xfs_trans_brelse() to release the buffer containing the
|
|
* on-disk inode, because it was acquired with xfs_trans_read_buf()
|
|
* in xfs_itobp() above. If tp is NULL, this is just a normal
|
|
* brelse(). If we're within a transaction, then xfs_trans_brelse()
|
|
* will only release the buffer if it is not dirty within the
|
|
* transaction. It will be OK to release the buffer in this case,
|
|
* because inodes on disk are never destroyed and we will be
|
|
* locking the new in-core inode before putting it in the hash
|
|
* table where other processes can find it. Thus we don't have
|
|
* to worry about the inode being changed just because we released
|
|
* the buffer.
|
|
*/
|
|
out_brelse:
|
|
xfs_trans_brelse(tp, bp);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Read in extents from a btree-format inode.
|
|
* Allocate and fill in if_extents. Real work is done in xfs_bmap.c.
|
|
*/
|
|
int
|
|
xfs_iread_extents(
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *ip,
|
|
int whichfork)
|
|
{
|
|
int error;
|
|
xfs_ifork_t *ifp;
|
|
xfs_extnum_t nextents;
|
|
|
|
if (unlikely(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
|
|
XFS_ERROR_REPORT("xfs_iread_extents", XFS_ERRLEVEL_LOW,
|
|
ip->i_mount);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
nextents = XFS_IFORK_NEXTENTS(ip, whichfork);
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
|
|
/*
|
|
* We know that the size is valid (it's checked in iformat_btree)
|
|
*/
|
|
ifp->if_lastex = NULLEXTNUM;
|
|
ifp->if_bytes = ifp->if_real_bytes = 0;
|
|
ifp->if_flags |= XFS_IFEXTENTS;
|
|
xfs_iext_add(ifp, 0, nextents);
|
|
error = xfs_bmap_read_extents(tp, ip, whichfork);
|
|
if (error) {
|
|
xfs_iext_destroy(ifp);
|
|
ifp->if_flags &= ~XFS_IFEXTENTS;
|
|
return error;
|
|
}
|
|
xfs_validate_extents(ifp, nextents, XFS_EXTFMT_INODE(ip));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Allocate an inode on disk and return a copy of its in-core version.
|
|
* The in-core inode is locked exclusively. Set mode, nlink, and rdev
|
|
* appropriately within the inode. The uid and gid for the inode are
|
|
* set according to the contents of the given cred structure.
|
|
*
|
|
* Use xfs_dialloc() to allocate the on-disk inode. If xfs_dialloc()
|
|
* has a free inode available, call xfs_iget()
|
|
* to obtain the in-core version of the allocated inode. Finally,
|
|
* fill in the inode and log its initial contents. In this case,
|
|
* ialloc_context would be set to NULL and call_again set to false.
|
|
*
|
|
* If xfs_dialloc() does not have an available inode,
|
|
* it will replenish its supply by doing an allocation. Since we can
|
|
* only do one allocation within a transaction without deadlocks, we
|
|
* must commit the current transaction before returning the inode itself.
|
|
* In this case, therefore, we will set call_again to true and return.
|
|
* The caller should then commit the current transaction, start a new
|
|
* transaction, and call xfs_ialloc() again to actually get the inode.
|
|
*
|
|
* To ensure that some other process does not grab the inode that
|
|
* was allocated during the first call to xfs_ialloc(), this routine
|
|
* also returns the [locked] bp pointing to the head of the freelist
|
|
* as ialloc_context. The caller should hold this buffer across
|
|
* the commit and pass it back into this routine on the second call.
|
|
*
|
|
* If we are allocating quota inodes, we do not have a parent inode
|
|
* to attach to or associate with (i.e. pip == NULL) because they
|
|
* are not linked into the directory structure - they are attached
|
|
* directly to the superblock - and so have no parent.
|
|
*/
|
|
int
|
|
xfs_ialloc(
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *pip,
|
|
mode_t mode,
|
|
xfs_nlink_t nlink,
|
|
xfs_dev_t rdev,
|
|
prid_t prid,
|
|
int okalloc,
|
|
xfs_buf_t **ialloc_context,
|
|
boolean_t *call_again,
|
|
xfs_inode_t **ipp)
|
|
{
|
|
xfs_ino_t ino;
|
|
xfs_inode_t *ip;
|
|
uint flags;
|
|
int error;
|
|
timespec_t tv;
|
|
int filestreams = 0;
|
|
|
|
/*
|
|
* Call the space management code to pick
|
|
* the on-disk inode to be allocated.
|
|
*/
|
|
error = xfs_dialloc(tp, pip ? pip->i_ino : 0, mode, okalloc,
|
|
ialloc_context, call_again, &ino);
|
|
if (error)
|
|
return error;
|
|
if (*call_again || ino == NULLFSINO) {
|
|
*ipp = NULL;
|
|
return 0;
|
|
}
|
|
ASSERT(*ialloc_context == NULL);
|
|
|
|
/*
|
|
* Get the in-core inode with the lock held exclusively.
|
|
* This is because we're setting fields here we need
|
|
* to prevent others from looking at until we're done.
|
|
*/
|
|
error = xfs_iget(tp->t_mountp, tp, ino, XFS_IGET_CREATE,
|
|
XFS_ILOCK_EXCL, &ip);
|
|
if (error)
|
|
return error;
|
|
ASSERT(ip != NULL);
|
|
|
|
ip->i_d.di_mode = (__uint16_t)mode;
|
|
ip->i_d.di_onlink = 0;
|
|
ip->i_d.di_nlink = nlink;
|
|
ASSERT(ip->i_d.di_nlink == nlink);
|
|
ip->i_d.di_uid = current_fsuid();
|
|
ip->i_d.di_gid = current_fsgid();
|
|
xfs_set_projid(ip, prid);
|
|
memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
|
|
|
|
/*
|
|
* If the superblock version is up to where we support new format
|
|
* inodes and this is currently an old format inode, then change
|
|
* the inode version number now. This way we only do the conversion
|
|
* here rather than here and in the flush/logging code.
|
|
*/
|
|
if (xfs_sb_version_hasnlink(&tp->t_mountp->m_sb) &&
|
|
ip->i_d.di_version == 1) {
|
|
ip->i_d.di_version = 2;
|
|
/*
|
|
* We've already zeroed the old link count, the projid field,
|
|
* and the pad field.
|
|
*/
|
|
}
|
|
|
|
/*
|
|
* Project ids won't be stored on disk if we are using a version 1 inode.
|
|
*/
|
|
if ((prid != 0) && (ip->i_d.di_version == 1))
|
|
xfs_bump_ino_vers2(tp, ip);
|
|
|
|
if (pip && XFS_INHERIT_GID(pip)) {
|
|
ip->i_d.di_gid = pip->i_d.di_gid;
|
|
if ((pip->i_d.di_mode & S_ISGID) && (mode & S_IFMT) == S_IFDIR) {
|
|
ip->i_d.di_mode |= S_ISGID;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* If the group ID of the new file does not match the effective group
|
|
* ID or one of the supplementary group IDs, the S_ISGID bit is cleared
|
|
* (and only if the irix_sgid_inherit compatibility variable is set).
|
|
*/
|
|
if ((irix_sgid_inherit) &&
|
|
(ip->i_d.di_mode & S_ISGID) &&
|
|
(!in_group_p((gid_t)ip->i_d.di_gid))) {
|
|
ip->i_d.di_mode &= ~S_ISGID;
|
|
}
|
|
|
|
ip->i_d.di_size = 0;
|
|
ip->i_size = 0;
|
|
ip->i_d.di_nextents = 0;
|
|
ASSERT(ip->i_d.di_nblocks == 0);
|
|
|
|
nanotime(&tv);
|
|
ip->i_d.di_mtime.t_sec = (__int32_t)tv.tv_sec;
|
|
ip->i_d.di_mtime.t_nsec = (__int32_t)tv.tv_nsec;
|
|
ip->i_d.di_atime = ip->i_d.di_mtime;
|
|
ip->i_d.di_ctime = ip->i_d.di_mtime;
|
|
|
|
/*
|
|
* di_gen will have been taken care of in xfs_iread.
|
|
*/
|
|
ip->i_d.di_extsize = 0;
|
|
ip->i_d.di_dmevmask = 0;
|
|
ip->i_d.di_dmstate = 0;
|
|
ip->i_d.di_flags = 0;
|
|
flags = XFS_ILOG_CORE;
|
|
switch (mode & S_IFMT) {
|
|
case S_IFIFO:
|
|
case S_IFCHR:
|
|
case S_IFBLK:
|
|
case S_IFSOCK:
|
|
ip->i_d.di_format = XFS_DINODE_FMT_DEV;
|
|
ip->i_df.if_u2.if_rdev = rdev;
|
|
ip->i_df.if_flags = 0;
|
|
flags |= XFS_ILOG_DEV;
|
|
break;
|
|
case S_IFREG:
|
|
/*
|
|
* we can't set up filestreams until after the VFS inode
|
|
* is set up properly.
|
|
*/
|
|
if (pip && xfs_inode_is_filestream(pip))
|
|
filestreams = 1;
|
|
/* fall through */
|
|
case S_IFDIR:
|
|
if (pip && (pip->i_d.di_flags & XFS_DIFLAG_ANY)) {
|
|
uint di_flags = 0;
|
|
|
|
if ((mode & S_IFMT) == S_IFDIR) {
|
|
if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
|
|
di_flags |= XFS_DIFLAG_RTINHERIT;
|
|
if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
|
|
di_flags |= XFS_DIFLAG_EXTSZINHERIT;
|
|
ip->i_d.di_extsize = pip->i_d.di_extsize;
|
|
}
|
|
} else if ((mode & S_IFMT) == S_IFREG) {
|
|
if (pip->i_d.di_flags & XFS_DIFLAG_RTINHERIT)
|
|
di_flags |= XFS_DIFLAG_REALTIME;
|
|
if (pip->i_d.di_flags & XFS_DIFLAG_EXTSZINHERIT) {
|
|
di_flags |= XFS_DIFLAG_EXTSIZE;
|
|
ip->i_d.di_extsize = pip->i_d.di_extsize;
|
|
}
|
|
}
|
|
if ((pip->i_d.di_flags & XFS_DIFLAG_NOATIME) &&
|
|
xfs_inherit_noatime)
|
|
di_flags |= XFS_DIFLAG_NOATIME;
|
|
if ((pip->i_d.di_flags & XFS_DIFLAG_NODUMP) &&
|
|
xfs_inherit_nodump)
|
|
di_flags |= XFS_DIFLAG_NODUMP;
|
|
if ((pip->i_d.di_flags & XFS_DIFLAG_SYNC) &&
|
|
xfs_inherit_sync)
|
|
di_flags |= XFS_DIFLAG_SYNC;
|
|
if ((pip->i_d.di_flags & XFS_DIFLAG_NOSYMLINKS) &&
|
|
xfs_inherit_nosymlinks)
|
|
di_flags |= XFS_DIFLAG_NOSYMLINKS;
|
|
if (pip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT)
|
|
di_flags |= XFS_DIFLAG_PROJINHERIT;
|
|
if ((pip->i_d.di_flags & XFS_DIFLAG_NODEFRAG) &&
|
|
xfs_inherit_nodefrag)
|
|
di_flags |= XFS_DIFLAG_NODEFRAG;
|
|
if (pip->i_d.di_flags & XFS_DIFLAG_FILESTREAM)
|
|
di_flags |= XFS_DIFLAG_FILESTREAM;
|
|
ip->i_d.di_flags |= di_flags;
|
|
}
|
|
/* FALLTHROUGH */
|
|
case S_IFLNK:
|
|
ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
|
|
ip->i_df.if_flags = XFS_IFEXTENTS;
|
|
ip->i_df.if_bytes = ip->i_df.if_real_bytes = 0;
|
|
ip->i_df.if_u1.if_extents = NULL;
|
|
break;
|
|
default:
|
|
ASSERT(0);
|
|
}
|
|
/*
|
|
* Attribute fork settings for new inode.
|
|
*/
|
|
ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
|
|
ip->i_d.di_anextents = 0;
|
|
|
|
/*
|
|
* Log the new values stuffed into the inode.
|
|
*/
|
|
xfs_trans_ijoin_ref(tp, ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_log_inode(tp, ip, flags);
|
|
|
|
/* now that we have an i_mode we can setup inode ops and unlock */
|
|
xfs_setup_inode(ip);
|
|
|
|
/* now we have set up the vfs inode we can associate the filestream */
|
|
if (filestreams) {
|
|
error = xfs_filestream_associate(pip, ip);
|
|
if (error < 0)
|
|
return -error;
|
|
if (!error)
|
|
xfs_iflags_set(ip, XFS_IFILESTREAM);
|
|
}
|
|
|
|
*ipp = ip;
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Check to make sure that there are no blocks allocated to the
|
|
* file beyond the size of the file. We don't check this for
|
|
* files with fixed size extents or real time extents, but we
|
|
* at least do it for regular files.
|
|
*/
|
|
#ifdef DEBUG
|
|
void
|
|
xfs_isize_check(
|
|
xfs_mount_t *mp,
|
|
xfs_inode_t *ip,
|
|
xfs_fsize_t isize)
|
|
{
|
|
xfs_fileoff_t map_first;
|
|
int nimaps;
|
|
xfs_bmbt_irec_t imaps[2];
|
|
|
|
if ((ip->i_d.di_mode & S_IFMT) != S_IFREG)
|
|
return;
|
|
|
|
if (XFS_IS_REALTIME_INODE(ip))
|
|
return;
|
|
|
|
if (ip->i_d.di_flags & XFS_DIFLAG_EXTSIZE)
|
|
return;
|
|
|
|
nimaps = 2;
|
|
map_first = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
|
|
/*
|
|
* The filesystem could be shutting down, so bmapi may return
|
|
* an error.
|
|
*/
|
|
if (xfs_bmapi(NULL, ip, map_first,
|
|
(XFS_B_TO_FSB(mp,
|
|
(xfs_ufsize_t)XFS_MAXIOFFSET(mp)) -
|
|
map_first),
|
|
XFS_BMAPI_ENTIRE, NULL, 0, imaps, &nimaps,
|
|
NULL))
|
|
return;
|
|
ASSERT(nimaps == 1);
|
|
ASSERT(imaps[0].br_startblock == HOLESTARTBLOCK);
|
|
}
|
|
#endif /* DEBUG */
|
|
|
|
/*
|
|
* Calculate the last possible buffered byte in a file. This must
|
|
* include data that was buffered beyond the EOF by the write code.
|
|
* This also needs to deal with overflowing the xfs_fsize_t type
|
|
* which can happen for sizes near the limit.
|
|
*
|
|
* We also need to take into account any blocks beyond the EOF. It
|
|
* may be the case that they were buffered by a write which failed.
|
|
* In that case the pages will still be in memory, but the inode size
|
|
* will never have been updated.
|
|
*/
|
|
STATIC xfs_fsize_t
|
|
xfs_file_last_byte(
|
|
xfs_inode_t *ip)
|
|
{
|
|
xfs_mount_t *mp;
|
|
xfs_fsize_t last_byte;
|
|
xfs_fileoff_t last_block;
|
|
xfs_fileoff_t size_last_block;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED));
|
|
|
|
mp = ip->i_mount;
|
|
/*
|
|
* Only check for blocks beyond the EOF if the extents have
|
|
* been read in. This eliminates the need for the inode lock,
|
|
* and it also saves us from looking when it really isn't
|
|
* necessary.
|
|
*/
|
|
if (ip->i_df.if_flags & XFS_IFEXTENTS) {
|
|
xfs_ilock(ip, XFS_ILOCK_SHARED);
|
|
error = xfs_bmap_last_offset(NULL, ip, &last_block,
|
|
XFS_DATA_FORK);
|
|
xfs_iunlock(ip, XFS_ILOCK_SHARED);
|
|
if (error) {
|
|
last_block = 0;
|
|
}
|
|
} else {
|
|
last_block = 0;
|
|
}
|
|
size_last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)ip->i_size);
|
|
last_block = XFS_FILEOFF_MAX(last_block, size_last_block);
|
|
|
|
last_byte = XFS_FSB_TO_B(mp, last_block);
|
|
if (last_byte < 0) {
|
|
return XFS_MAXIOFFSET(mp);
|
|
}
|
|
last_byte += (1 << mp->m_writeio_log);
|
|
if (last_byte < 0) {
|
|
return XFS_MAXIOFFSET(mp);
|
|
}
|
|
return last_byte;
|
|
}
|
|
|
|
/*
|
|
* Start the truncation of the file to new_size. The new size
|
|
* must be smaller than the current size. This routine will
|
|
* clear the buffer and page caches of file data in the removed
|
|
* range, and xfs_itruncate_finish() will remove the underlying
|
|
* disk blocks.
|
|
*
|
|
* The inode must have its I/O lock locked EXCLUSIVELY, and it
|
|
* must NOT have the inode lock held at all. This is because we're
|
|
* calling into the buffer/page cache code and we can't hold the
|
|
* inode lock when we do so.
|
|
*
|
|
* We need to wait for any direct I/Os in flight to complete before we
|
|
* proceed with the truncate. This is needed to prevent the extents
|
|
* being read or written by the direct I/Os from being removed while the
|
|
* I/O is in flight as there is no other method of synchronising
|
|
* direct I/O with the truncate operation. Also, because we hold
|
|
* the IOLOCK in exclusive mode, we prevent new direct I/Os from being
|
|
* started until the truncate completes and drops the lock. Essentially,
|
|
* the xfs_ioend_wait() call forms an I/O barrier that provides strict
|
|
* ordering between direct I/Os and the truncate operation.
|
|
*
|
|
* The flags parameter can have either the value XFS_ITRUNC_DEFINITE
|
|
* or XFS_ITRUNC_MAYBE. The XFS_ITRUNC_MAYBE value should be used
|
|
* in the case that the caller is locking things out of order and
|
|
* may not be able to call xfs_itruncate_finish() with the inode lock
|
|
* held without dropping the I/O lock. If the caller must drop the
|
|
* I/O lock before calling xfs_itruncate_finish(), then xfs_itruncate_start()
|
|
* must be called again with all the same restrictions as the initial
|
|
* call.
|
|
*/
|
|
int
|
|
xfs_itruncate_start(
|
|
xfs_inode_t *ip,
|
|
uint flags,
|
|
xfs_fsize_t new_size)
|
|
{
|
|
xfs_fsize_t last_byte;
|
|
xfs_off_t toss_start;
|
|
xfs_mount_t *mp;
|
|
int error = 0;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
|
|
ASSERT((new_size == 0) || (new_size <= ip->i_size));
|
|
ASSERT((flags == XFS_ITRUNC_DEFINITE) ||
|
|
(flags == XFS_ITRUNC_MAYBE));
|
|
|
|
mp = ip->i_mount;
|
|
|
|
/* wait for the completion of any pending DIOs */
|
|
if (new_size == 0 || new_size < ip->i_size)
|
|
xfs_ioend_wait(ip);
|
|
|
|
/*
|
|
* Call toss_pages or flushinval_pages to get rid of pages
|
|
* overlapping the region being removed. We have to use
|
|
* the less efficient flushinval_pages in the case that the
|
|
* caller may not be able to finish the truncate without
|
|
* dropping the inode's I/O lock. Make sure
|
|
* to catch any pages brought in by buffers overlapping
|
|
* the EOF by searching out beyond the isize by our
|
|
* block size. We round new_size up to a block boundary
|
|
* so that we don't toss things on the same block as
|
|
* new_size but before it.
|
|
*
|
|
* Before calling toss_page or flushinval_pages, make sure to
|
|
* call remapf() over the same region if the file is mapped.
|
|
* This frees up mapped file references to the pages in the
|
|
* given range and for the flushinval_pages case it ensures
|
|
* that we get the latest mapped changes flushed out.
|
|
*/
|
|
toss_start = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
|
|
toss_start = XFS_FSB_TO_B(mp, toss_start);
|
|
if (toss_start < 0) {
|
|
/*
|
|
* The place to start tossing is beyond our maximum
|
|
* file size, so there is no way that the data extended
|
|
* out there.
|
|
*/
|
|
return 0;
|
|
}
|
|
last_byte = xfs_file_last_byte(ip);
|
|
trace_xfs_itruncate_start(ip, flags, new_size, toss_start, last_byte);
|
|
if (last_byte > toss_start) {
|
|
if (flags & XFS_ITRUNC_DEFINITE) {
|
|
xfs_tosspages(ip, toss_start,
|
|
-1, FI_REMAPF_LOCKED);
|
|
} else {
|
|
error = xfs_flushinval_pages(ip, toss_start,
|
|
-1, FI_REMAPF_LOCKED);
|
|
}
|
|
}
|
|
|
|
#ifdef DEBUG
|
|
if (new_size == 0) {
|
|
ASSERT(VN_CACHED(VFS_I(ip)) == 0);
|
|
}
|
|
#endif
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Shrink the file to the given new_size. The new size must be smaller than
|
|
* the current size. This will free up the underlying blocks in the removed
|
|
* range after a call to xfs_itruncate_start() or xfs_atruncate_start().
|
|
*
|
|
* The transaction passed to this routine must have made a permanent log
|
|
* reservation of at least XFS_ITRUNCATE_LOG_RES. This routine may commit the
|
|
* given transaction and start new ones, so make sure everything involved in
|
|
* the transaction is tidy before calling here. Some transaction will be
|
|
* returned to the caller to be committed. The incoming transaction must
|
|
* already include the inode, and both inode locks must be held exclusively.
|
|
* The inode must also be "held" within the transaction. On return the inode
|
|
* will be "held" within the returned transaction. This routine does NOT
|
|
* require any disk space to be reserved for it within the transaction.
|
|
*
|
|
* The fork parameter must be either xfs_attr_fork or xfs_data_fork, and it
|
|
* indicates the fork which is to be truncated. For the attribute fork we only
|
|
* support truncation to size 0.
|
|
*
|
|
* We use the sync parameter to indicate whether or not the first transaction
|
|
* we perform might have to be synchronous. For the attr fork, it needs to be
|
|
* so if the unlink of the inode is not yet known to be permanent in the log.
|
|
* This keeps us from freeing and reusing the blocks of the attribute fork
|
|
* before the unlink of the inode becomes permanent.
|
|
*
|
|
* For the data fork, we normally have to run synchronously if we're being
|
|
* called out of the inactive path or we're being called out of the create path
|
|
* where we're truncating an existing file. Either way, the truncate needs to
|
|
* be sync so blocks don't reappear in the file with altered data in case of a
|
|
* crash. wsync filesystems can run the first case async because anything that
|
|
* shrinks the inode has to run sync so by the time we're called here from
|
|
* inactive, the inode size is permanently set to 0.
|
|
*
|
|
* Calls from the truncate path always need to be sync unless we're in a wsync
|
|
* filesystem and the file has already been unlinked.
|
|
*
|
|
* The caller is responsible for correctly setting the sync parameter. It gets
|
|
* too hard for us to guess here which path we're being called out of just
|
|
* based on inode state.
|
|
*
|
|
* If we get an error, we must return with the inode locked and linked into the
|
|
* current transaction. This keeps things simple for the higher level code,
|
|
* because it always knows that the inode is locked and held in the transaction
|
|
* that returns to it whether errors occur or not. We don't mark the inode
|
|
* dirty on error so that transactions can be easily aborted if possible.
|
|
*/
|
|
int
|
|
xfs_itruncate_finish(
|
|
xfs_trans_t **tp,
|
|
xfs_inode_t *ip,
|
|
xfs_fsize_t new_size,
|
|
int fork,
|
|
int sync)
|
|
{
|
|
xfs_fsblock_t first_block;
|
|
xfs_fileoff_t first_unmap_block;
|
|
xfs_fileoff_t last_block;
|
|
xfs_filblks_t unmap_len=0;
|
|
xfs_mount_t *mp;
|
|
xfs_trans_t *ntp;
|
|
int done;
|
|
int committed;
|
|
xfs_bmap_free_t free_list;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_IOLOCK_EXCL));
|
|
ASSERT((new_size == 0) || (new_size <= ip->i_size));
|
|
ASSERT(*tp != NULL);
|
|
ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
|
|
ASSERT(ip->i_transp == *tp);
|
|
ASSERT(ip->i_itemp != NULL);
|
|
ASSERT(ip->i_itemp->ili_lock_flags == 0);
|
|
|
|
|
|
ntp = *tp;
|
|
mp = (ntp)->t_mountp;
|
|
ASSERT(! XFS_NOT_DQATTACHED(mp, ip));
|
|
|
|
/*
|
|
* We only support truncating the entire attribute fork.
|
|
*/
|
|
if (fork == XFS_ATTR_FORK) {
|
|
new_size = 0LL;
|
|
}
|
|
first_unmap_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)new_size);
|
|
trace_xfs_itruncate_finish_start(ip, new_size);
|
|
|
|
/*
|
|
* The first thing we do is set the size to new_size permanently
|
|
* on disk. This way we don't have to worry about anyone ever
|
|
* being able to look at the data being freed even in the face
|
|
* of a crash. What we're getting around here is the case where
|
|
* we free a block, it is allocated to another file, it is written
|
|
* to, and then we crash. If the new data gets written to the
|
|
* file but the log buffers containing the free and reallocation
|
|
* don't, then we'd end up with garbage in the blocks being freed.
|
|
* As long as we make the new_size permanent before actually
|
|
* freeing any blocks it doesn't matter if they get writtten to.
|
|
*
|
|
* The callers must signal into us whether or not the size
|
|
* setting here must be synchronous. There are a few cases
|
|
* where it doesn't have to be synchronous. Those cases
|
|
* occur if the file is unlinked and we know the unlink is
|
|
* permanent or if the blocks being truncated are guaranteed
|
|
* to be beyond the inode eof (regardless of the link count)
|
|
* and the eof value is permanent. Both of these cases occur
|
|
* only on wsync-mounted filesystems. In those cases, we're
|
|
* guaranteed that no user will ever see the data in the blocks
|
|
* that are being truncated so the truncate can run async.
|
|
* In the free beyond eof case, the file may wind up with
|
|
* more blocks allocated to it than it needs if we crash
|
|
* and that won't get fixed until the next time the file
|
|
* is re-opened and closed but that's ok as that shouldn't
|
|
* be too many blocks.
|
|
*
|
|
* However, we can't just make all wsync xactions run async
|
|
* because there's one call out of the create path that needs
|
|
* to run sync where it's truncating an existing file to size
|
|
* 0 whose size is > 0.
|
|
*
|
|
* It's probably possible to come up with a test in this
|
|
* routine that would correctly distinguish all the above
|
|
* cases from the values of the function parameters and the
|
|
* inode state but for sanity's sake, I've decided to let the
|
|
* layers above just tell us. It's simpler to correctly figure
|
|
* out in the layer above exactly under what conditions we
|
|
* can run async and I think it's easier for others read and
|
|
* follow the logic in case something has to be changed.
|
|
* cscope is your friend -- rcc.
|
|
*
|
|
* The attribute fork is much simpler.
|
|
*
|
|
* For the attribute fork we allow the caller to tell us whether
|
|
* the unlink of the inode that led to this call is yet permanent
|
|
* in the on disk log. If it is not and we will be freeing extents
|
|
* in this inode then we make the first transaction synchronous
|
|
* to make sure that the unlink is permanent by the time we free
|
|
* the blocks.
|
|
*/
|
|
if (fork == XFS_DATA_FORK) {
|
|
if (ip->i_d.di_nextents > 0) {
|
|
/*
|
|
* If we are not changing the file size then do
|
|
* not update the on-disk file size - we may be
|
|
* called from xfs_inactive_free_eofblocks(). If we
|
|
* update the on-disk file size and then the system
|
|
* crashes before the contents of the file are
|
|
* flushed to disk then the files may be full of
|
|
* holes (ie NULL files bug).
|
|
*/
|
|
if (ip->i_size != new_size) {
|
|
ip->i_d.di_size = new_size;
|
|
ip->i_size = new_size;
|
|
xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
|
|
}
|
|
}
|
|
} else if (sync) {
|
|
ASSERT(!(mp->m_flags & XFS_MOUNT_WSYNC));
|
|
if (ip->i_d.di_anextents > 0)
|
|
xfs_trans_set_sync(ntp);
|
|
}
|
|
ASSERT(fork == XFS_DATA_FORK ||
|
|
(fork == XFS_ATTR_FORK &&
|
|
((sync && !(mp->m_flags & XFS_MOUNT_WSYNC)) ||
|
|
(sync == 0 && (mp->m_flags & XFS_MOUNT_WSYNC)))));
|
|
|
|
/*
|
|
* Since it is possible for space to become allocated beyond
|
|
* the end of the file (in a crash where the space is allocated
|
|
* but the inode size is not yet updated), simply remove any
|
|
* blocks which show up between the new EOF and the maximum
|
|
* possible file size. If the first block to be removed is
|
|
* beyond the maximum file size (ie it is the same as last_block),
|
|
* then there is nothing to do.
|
|
*/
|
|
last_block = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
|
|
ASSERT(first_unmap_block <= last_block);
|
|
done = 0;
|
|
if (last_block == first_unmap_block) {
|
|
done = 1;
|
|
} else {
|
|
unmap_len = last_block - first_unmap_block + 1;
|
|
}
|
|
while (!done) {
|
|
/*
|
|
* Free up up to XFS_ITRUNC_MAX_EXTENTS. xfs_bunmapi()
|
|
* will tell us whether it freed the entire range or
|
|
* not. If this is a synchronous mount (wsync),
|
|
* then we can tell bunmapi to keep all the
|
|
* transactions asynchronous since the unlink
|
|
* transaction that made this inode inactive has
|
|
* already hit the disk. There's no danger of
|
|
* the freed blocks being reused, there being a
|
|
* crash, and the reused blocks suddenly reappearing
|
|
* in this file with garbage in them once recovery
|
|
* runs.
|
|
*/
|
|
xfs_bmap_init(&free_list, &first_block);
|
|
error = xfs_bunmapi(ntp, ip,
|
|
first_unmap_block, unmap_len,
|
|
xfs_bmapi_aflag(fork),
|
|
XFS_ITRUNC_MAX_EXTENTS,
|
|
&first_block, &free_list,
|
|
&done);
|
|
if (error) {
|
|
/*
|
|
* If the bunmapi call encounters an error,
|
|
* return to the caller where the transaction
|
|
* can be properly aborted. We just need to
|
|
* make sure we're not holding any resources
|
|
* that we were not when we came in.
|
|
*/
|
|
xfs_bmap_cancel(&free_list);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* Duplicate the transaction that has the permanent
|
|
* reservation and commit the old transaction.
|
|
*/
|
|
error = xfs_bmap_finish(tp, &free_list, &committed);
|
|
ntp = *tp;
|
|
if (committed)
|
|
xfs_trans_ijoin(ntp, ip);
|
|
|
|
if (error) {
|
|
/*
|
|
* If the bmap finish call encounters an error, return
|
|
* to the caller where the transaction can be properly
|
|
* aborted. We just need to make sure we're not
|
|
* holding any resources that we were not when we came
|
|
* in.
|
|
*
|
|
* Aborting from this point might lose some blocks in
|
|
* the file system, but oh well.
|
|
*/
|
|
xfs_bmap_cancel(&free_list);
|
|
return error;
|
|
}
|
|
|
|
if (committed) {
|
|
/*
|
|
* Mark the inode dirty so it will be logged and
|
|
* moved forward in the log as part of every commit.
|
|
*/
|
|
xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
|
|
}
|
|
|
|
ntp = xfs_trans_dup(ntp);
|
|
error = xfs_trans_commit(*tp, 0);
|
|
*tp = ntp;
|
|
|
|
xfs_trans_ijoin(ntp, ip);
|
|
|
|
if (error)
|
|
return error;
|
|
/*
|
|
* transaction commit worked ok so we can drop the extra ticket
|
|
* reference that we gained in xfs_trans_dup()
|
|
*/
|
|
xfs_log_ticket_put(ntp->t_ticket);
|
|
error = xfs_trans_reserve(ntp, 0,
|
|
XFS_ITRUNCATE_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_ITRUNCATE_LOG_COUNT);
|
|
if (error)
|
|
return error;
|
|
}
|
|
/*
|
|
* Only update the size in the case of the data fork, but
|
|
* always re-log the inode so that our permanent transaction
|
|
* can keep on rolling it forward in the log.
|
|
*/
|
|
if (fork == XFS_DATA_FORK) {
|
|
xfs_isize_check(mp, ip, new_size);
|
|
/*
|
|
* If we are not changing the file size then do
|
|
* not update the on-disk file size - we may be
|
|
* called from xfs_inactive_free_eofblocks(). If we
|
|
* update the on-disk file size and then the system
|
|
* crashes before the contents of the file are
|
|
* flushed to disk then the files may be full of
|
|
* holes (ie NULL files bug).
|
|
*/
|
|
if (ip->i_size != new_size) {
|
|
ip->i_d.di_size = new_size;
|
|
ip->i_size = new_size;
|
|
}
|
|
}
|
|
xfs_trans_log_inode(ntp, ip, XFS_ILOG_CORE);
|
|
ASSERT((new_size != 0) ||
|
|
(fork == XFS_ATTR_FORK) ||
|
|
(ip->i_delayed_blks == 0));
|
|
ASSERT((new_size != 0) ||
|
|
(fork == XFS_ATTR_FORK) ||
|
|
(ip->i_d.di_nextents == 0));
|
|
trace_xfs_itruncate_finish_end(ip, new_size);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This is called when the inode's link count goes to 0.
|
|
* We place the on-disk inode on a list in the AGI. It
|
|
* will be pulled from this list when the inode is freed.
|
|
*/
|
|
int
|
|
xfs_iunlink(
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *ip)
|
|
{
|
|
xfs_mount_t *mp;
|
|
xfs_agi_t *agi;
|
|
xfs_dinode_t *dip;
|
|
xfs_buf_t *agibp;
|
|
xfs_buf_t *ibp;
|
|
xfs_agino_t agino;
|
|
short bucket_index;
|
|
int offset;
|
|
int error;
|
|
|
|
ASSERT(ip->i_d.di_nlink == 0);
|
|
ASSERT(ip->i_d.di_mode != 0);
|
|
ASSERT(ip->i_transp == tp);
|
|
|
|
mp = tp->t_mountp;
|
|
|
|
/*
|
|
* Get the agi buffer first. It ensures lock ordering
|
|
* on the list.
|
|
*/
|
|
error = xfs_read_agi(mp, tp, XFS_INO_TO_AGNO(mp, ip->i_ino), &agibp);
|
|
if (error)
|
|
return error;
|
|
agi = XFS_BUF_TO_AGI(agibp);
|
|
|
|
/*
|
|
* Get the index into the agi hash table for the
|
|
* list this inode will go on.
|
|
*/
|
|
agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
|
|
ASSERT(agino != 0);
|
|
bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
|
|
ASSERT(agi->agi_unlinked[bucket_index]);
|
|
ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != agino);
|
|
|
|
if (be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO) {
|
|
/*
|
|
* There is already another inode in the bucket we need
|
|
* to add ourselves to. Add us at the front of the list.
|
|
* Here we put the head pointer into our next pointer,
|
|
* and then we fall through to point the head at us.
|
|
*/
|
|
error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
|
|
if (error)
|
|
return error;
|
|
|
|
ASSERT(be32_to_cpu(dip->di_next_unlinked) == NULLAGINO);
|
|
/* both on-disk, don't endian flip twice */
|
|
dip->di_next_unlinked = agi->agi_unlinked[bucket_index];
|
|
offset = ip->i_imap.im_boffset +
|
|
offsetof(xfs_dinode_t, di_next_unlinked);
|
|
xfs_trans_inode_buf(tp, ibp);
|
|
xfs_trans_log_buf(tp, ibp, offset,
|
|
(offset + sizeof(xfs_agino_t) - 1));
|
|
xfs_inobp_check(mp, ibp);
|
|
}
|
|
|
|
/*
|
|
* Point the bucket head pointer at the inode being inserted.
|
|
*/
|
|
ASSERT(agino != 0);
|
|
agi->agi_unlinked[bucket_index] = cpu_to_be32(agino);
|
|
offset = offsetof(xfs_agi_t, agi_unlinked) +
|
|
(sizeof(xfs_agino_t) * bucket_index);
|
|
xfs_trans_log_buf(tp, agibp, offset,
|
|
(offset + sizeof(xfs_agino_t) - 1));
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pull the on-disk inode from the AGI unlinked list.
|
|
*/
|
|
STATIC int
|
|
xfs_iunlink_remove(
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *ip)
|
|
{
|
|
xfs_ino_t next_ino;
|
|
xfs_mount_t *mp;
|
|
xfs_agi_t *agi;
|
|
xfs_dinode_t *dip;
|
|
xfs_buf_t *agibp;
|
|
xfs_buf_t *ibp;
|
|
xfs_agnumber_t agno;
|
|
xfs_agino_t agino;
|
|
xfs_agino_t next_agino;
|
|
xfs_buf_t *last_ibp;
|
|
xfs_dinode_t *last_dip = NULL;
|
|
short bucket_index;
|
|
int offset, last_offset = 0;
|
|
int error;
|
|
|
|
mp = tp->t_mountp;
|
|
agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
|
|
|
|
/*
|
|
* Get the agi buffer first. It ensures lock ordering
|
|
* on the list.
|
|
*/
|
|
error = xfs_read_agi(mp, tp, agno, &agibp);
|
|
if (error)
|
|
return error;
|
|
|
|
agi = XFS_BUF_TO_AGI(agibp);
|
|
|
|
/*
|
|
* Get the index into the agi hash table for the
|
|
* list this inode will go on.
|
|
*/
|
|
agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
|
|
ASSERT(agino != 0);
|
|
bucket_index = agino % XFS_AGI_UNLINKED_BUCKETS;
|
|
ASSERT(be32_to_cpu(agi->agi_unlinked[bucket_index]) != NULLAGINO);
|
|
ASSERT(agi->agi_unlinked[bucket_index]);
|
|
|
|
if (be32_to_cpu(agi->agi_unlinked[bucket_index]) == agino) {
|
|
/*
|
|
* We're at the head of the list. Get the inode's
|
|
* on-disk buffer to see if there is anyone after us
|
|
* on the list. Only modify our next pointer if it
|
|
* is not already NULLAGINO. This saves us the overhead
|
|
* of dealing with the buffer when there is no need to
|
|
* change it.
|
|
*/
|
|
error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
|
|
if (error) {
|
|
xfs_warn(mp, "%s: xfs_itobp() returned error %d.",
|
|
__func__, error);
|
|
return error;
|
|
}
|
|
next_agino = be32_to_cpu(dip->di_next_unlinked);
|
|
ASSERT(next_agino != 0);
|
|
if (next_agino != NULLAGINO) {
|
|
dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
|
|
offset = ip->i_imap.im_boffset +
|
|
offsetof(xfs_dinode_t, di_next_unlinked);
|
|
xfs_trans_inode_buf(tp, ibp);
|
|
xfs_trans_log_buf(tp, ibp, offset,
|
|
(offset + sizeof(xfs_agino_t) - 1));
|
|
xfs_inobp_check(mp, ibp);
|
|
} else {
|
|
xfs_trans_brelse(tp, ibp);
|
|
}
|
|
/*
|
|
* Point the bucket head pointer at the next inode.
|
|
*/
|
|
ASSERT(next_agino != 0);
|
|
ASSERT(next_agino != agino);
|
|
agi->agi_unlinked[bucket_index] = cpu_to_be32(next_agino);
|
|
offset = offsetof(xfs_agi_t, agi_unlinked) +
|
|
(sizeof(xfs_agino_t) * bucket_index);
|
|
xfs_trans_log_buf(tp, agibp, offset,
|
|
(offset + sizeof(xfs_agino_t) - 1));
|
|
} else {
|
|
/*
|
|
* We need to search the list for the inode being freed.
|
|
*/
|
|
next_agino = be32_to_cpu(agi->agi_unlinked[bucket_index]);
|
|
last_ibp = NULL;
|
|
while (next_agino != agino) {
|
|
/*
|
|
* If the last inode wasn't the one pointing to
|
|
* us, then release its buffer since we're not
|
|
* going to do anything with it.
|
|
*/
|
|
if (last_ibp != NULL) {
|
|
xfs_trans_brelse(tp, last_ibp);
|
|
}
|
|
next_ino = XFS_AGINO_TO_INO(mp, agno, next_agino);
|
|
error = xfs_inotobp(mp, tp, next_ino, &last_dip,
|
|
&last_ibp, &last_offset, 0);
|
|
if (error) {
|
|
xfs_warn(mp,
|
|
"%s: xfs_inotobp() returned error %d.",
|
|
__func__, error);
|
|
return error;
|
|
}
|
|
next_agino = be32_to_cpu(last_dip->di_next_unlinked);
|
|
ASSERT(next_agino != NULLAGINO);
|
|
ASSERT(next_agino != 0);
|
|
}
|
|
/*
|
|
* Now last_ibp points to the buffer previous to us on
|
|
* the unlinked list. Pull us from the list.
|
|
*/
|
|
error = xfs_itobp(mp, tp, ip, &dip, &ibp, XBF_LOCK);
|
|
if (error) {
|
|
xfs_warn(mp, "%s: xfs_itobp(2) returned error %d.",
|
|
__func__, error);
|
|
return error;
|
|
}
|
|
next_agino = be32_to_cpu(dip->di_next_unlinked);
|
|
ASSERT(next_agino != 0);
|
|
ASSERT(next_agino != agino);
|
|
if (next_agino != NULLAGINO) {
|
|
dip->di_next_unlinked = cpu_to_be32(NULLAGINO);
|
|
offset = ip->i_imap.im_boffset +
|
|
offsetof(xfs_dinode_t, di_next_unlinked);
|
|
xfs_trans_inode_buf(tp, ibp);
|
|
xfs_trans_log_buf(tp, ibp, offset,
|
|
(offset + sizeof(xfs_agino_t) - 1));
|
|
xfs_inobp_check(mp, ibp);
|
|
} else {
|
|
xfs_trans_brelse(tp, ibp);
|
|
}
|
|
/*
|
|
* Point the previous inode on the list to the next inode.
|
|
*/
|
|
last_dip->di_next_unlinked = cpu_to_be32(next_agino);
|
|
ASSERT(next_agino != 0);
|
|
offset = last_offset + offsetof(xfs_dinode_t, di_next_unlinked);
|
|
xfs_trans_inode_buf(tp, last_ibp);
|
|
xfs_trans_log_buf(tp, last_ibp, offset,
|
|
(offset + sizeof(xfs_agino_t) - 1));
|
|
xfs_inobp_check(mp, last_ibp);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* A big issue when freeing the inode cluster is is that we _cannot_ skip any
|
|
* inodes that are in memory - they all must be marked stale and attached to
|
|
* the cluster buffer.
|
|
*/
|
|
STATIC void
|
|
xfs_ifree_cluster(
|
|
xfs_inode_t *free_ip,
|
|
xfs_trans_t *tp,
|
|
xfs_ino_t inum)
|
|
{
|
|
xfs_mount_t *mp = free_ip->i_mount;
|
|
int blks_per_cluster;
|
|
int nbufs;
|
|
int ninodes;
|
|
int i, j;
|
|
xfs_daddr_t blkno;
|
|
xfs_buf_t *bp;
|
|
xfs_inode_t *ip;
|
|
xfs_inode_log_item_t *iip;
|
|
xfs_log_item_t *lip;
|
|
struct xfs_perag *pag;
|
|
|
|
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, inum));
|
|
if (mp->m_sb.sb_blocksize >= XFS_INODE_CLUSTER_SIZE(mp)) {
|
|
blks_per_cluster = 1;
|
|
ninodes = mp->m_sb.sb_inopblock;
|
|
nbufs = XFS_IALLOC_BLOCKS(mp);
|
|
} else {
|
|
blks_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) /
|
|
mp->m_sb.sb_blocksize;
|
|
ninodes = blks_per_cluster * mp->m_sb.sb_inopblock;
|
|
nbufs = XFS_IALLOC_BLOCKS(mp) / blks_per_cluster;
|
|
}
|
|
|
|
for (j = 0; j < nbufs; j++, inum += ninodes) {
|
|
blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
|
|
XFS_INO_TO_AGBNO(mp, inum));
|
|
|
|
/*
|
|
* We obtain and lock the backing buffer first in the process
|
|
* here, as we have to ensure that any dirty inode that we
|
|
* can't get the flush lock on is attached to the buffer.
|
|
* If we scan the in-memory inodes first, then buffer IO can
|
|
* complete before we get a lock on it, and hence we may fail
|
|
* to mark all the active inodes on the buffer stale.
|
|
*/
|
|
bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, blkno,
|
|
mp->m_bsize * blks_per_cluster,
|
|
XBF_LOCK);
|
|
|
|
/*
|
|
* Walk the inodes already attached to the buffer and mark them
|
|
* stale. These will all have the flush locks held, so an
|
|
* in-memory inode walk can't lock them. By marking them all
|
|
* stale first, we will not attempt to lock them in the loop
|
|
* below as the XFS_ISTALE flag will be set.
|
|
*/
|
|
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
|
|
while (lip) {
|
|
if (lip->li_type == XFS_LI_INODE) {
|
|
iip = (xfs_inode_log_item_t *)lip;
|
|
ASSERT(iip->ili_logged == 1);
|
|
lip->li_cb = xfs_istale_done;
|
|
xfs_trans_ail_copy_lsn(mp->m_ail,
|
|
&iip->ili_flush_lsn,
|
|
&iip->ili_item.li_lsn);
|
|
xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
|
|
}
|
|
lip = lip->li_bio_list;
|
|
}
|
|
|
|
|
|
/*
|
|
* For each inode in memory attempt to add it to the inode
|
|
* buffer and set it up for being staled on buffer IO
|
|
* completion. This is safe as we've locked out tail pushing
|
|
* and flushing by locking the buffer.
|
|
*
|
|
* We have already marked every inode that was part of a
|
|
* transaction stale above, which means there is no point in
|
|
* even trying to lock them.
|
|
*/
|
|
for (i = 0; i < ninodes; i++) {
|
|
retry:
|
|
rcu_read_lock();
|
|
ip = radix_tree_lookup(&pag->pag_ici_root,
|
|
XFS_INO_TO_AGINO(mp, (inum + i)));
|
|
|
|
/* Inode not in memory, nothing to do */
|
|
if (!ip) {
|
|
rcu_read_unlock();
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* because this is an RCU protected lookup, we could
|
|
* find a recently freed or even reallocated inode
|
|
* during the lookup. We need to check under the
|
|
* i_flags_lock for a valid inode here. Skip it if it
|
|
* is not valid, the wrong inode or stale.
|
|
*/
|
|
spin_lock(&ip->i_flags_lock);
|
|
if (ip->i_ino != inum + i ||
|
|
__xfs_iflags_test(ip, XFS_ISTALE)) {
|
|
spin_unlock(&ip->i_flags_lock);
|
|
rcu_read_unlock();
|
|
continue;
|
|
}
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
/*
|
|
* Don't try to lock/unlock the current inode, but we
|
|
* _cannot_ skip the other inodes that we did not find
|
|
* in the list attached to the buffer and are not
|
|
* already marked stale. If we can't lock it, back off
|
|
* and retry.
|
|
*/
|
|
if (ip != free_ip &&
|
|
!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
|
|
rcu_read_unlock();
|
|
delay(1);
|
|
goto retry;
|
|
}
|
|
rcu_read_unlock();
|
|
|
|
xfs_iflock(ip);
|
|
xfs_iflags_set(ip, XFS_ISTALE);
|
|
|
|
/*
|
|
* we don't need to attach clean inodes or those only
|
|
* with unlogged changes (which we throw away, anyway).
|
|
*/
|
|
iip = ip->i_itemp;
|
|
if (!iip || xfs_inode_clean(ip)) {
|
|
ASSERT(ip != free_ip);
|
|
ip->i_update_core = 0;
|
|
xfs_ifunlock(ip);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
continue;
|
|
}
|
|
|
|
iip->ili_last_fields = iip->ili_format.ilf_fields;
|
|
iip->ili_format.ilf_fields = 0;
|
|
iip->ili_logged = 1;
|
|
xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
|
|
&iip->ili_item.li_lsn);
|
|
|
|
xfs_buf_attach_iodone(bp, xfs_istale_done,
|
|
&iip->ili_item);
|
|
|
|
if (ip != free_ip)
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
xfs_trans_stale_inode_buf(tp, bp);
|
|
xfs_trans_binval(tp, bp);
|
|
}
|
|
|
|
xfs_perag_put(pag);
|
|
}
|
|
|
|
/*
|
|
* This is called to return an inode to the inode free list.
|
|
* The inode should already be truncated to 0 length and have
|
|
* no pages associated with it. This routine also assumes that
|
|
* the inode is already a part of the transaction.
|
|
*
|
|
* The on-disk copy of the inode will have been added to the list
|
|
* of unlinked inodes in the AGI. We need to remove the inode from
|
|
* that list atomically with respect to freeing it here.
|
|
*/
|
|
int
|
|
xfs_ifree(
|
|
xfs_trans_t *tp,
|
|
xfs_inode_t *ip,
|
|
xfs_bmap_free_t *flist)
|
|
{
|
|
int error;
|
|
int delete;
|
|
xfs_ino_t first_ino;
|
|
xfs_dinode_t *dip;
|
|
xfs_buf_t *ibp;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
ASSERT(ip->i_transp == tp);
|
|
ASSERT(ip->i_d.di_nlink == 0);
|
|
ASSERT(ip->i_d.di_nextents == 0);
|
|
ASSERT(ip->i_d.di_anextents == 0);
|
|
ASSERT((ip->i_d.di_size == 0 && ip->i_size == 0) ||
|
|
((ip->i_d.di_mode & S_IFMT) != S_IFREG));
|
|
ASSERT(ip->i_d.di_nblocks == 0);
|
|
|
|
/*
|
|
* Pull the on-disk inode from the AGI unlinked list.
|
|
*/
|
|
error = xfs_iunlink_remove(tp, ip);
|
|
if (error != 0) {
|
|
return error;
|
|
}
|
|
|
|
error = xfs_difree(tp, ip->i_ino, flist, &delete, &first_ino);
|
|
if (error != 0) {
|
|
return error;
|
|
}
|
|
ip->i_d.di_mode = 0; /* mark incore inode as free */
|
|
ip->i_d.di_flags = 0;
|
|
ip->i_d.di_dmevmask = 0;
|
|
ip->i_d.di_forkoff = 0; /* mark the attr fork not in use */
|
|
ip->i_df.if_ext_max =
|
|
XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
|
|
ip->i_d.di_format = XFS_DINODE_FMT_EXTENTS;
|
|
ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
|
|
/*
|
|
* Bump the generation count so no one will be confused
|
|
* by reincarnations of this inode.
|
|
*/
|
|
ip->i_d.di_gen++;
|
|
|
|
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
|
|
|
|
error = xfs_itobp(ip->i_mount, tp, ip, &dip, &ibp, XBF_LOCK);
|
|
if (error)
|
|
return error;
|
|
|
|
/*
|
|
* Clear the on-disk di_mode. This is to prevent xfs_bulkstat
|
|
* from picking up this inode when it is reclaimed (its incore state
|
|
* initialzed but not flushed to disk yet). The in-core di_mode is
|
|
* already cleared and a corresponding transaction logged.
|
|
* The hack here just synchronizes the in-core to on-disk
|
|
* di_mode value in advance before the actual inode sync to disk.
|
|
* This is OK because the inode is already unlinked and would never
|
|
* change its di_mode again for this inode generation.
|
|
* This is a temporary hack that would require a proper fix
|
|
* in the future.
|
|
*/
|
|
dip->di_mode = 0;
|
|
|
|
if (delete) {
|
|
xfs_ifree_cluster(ip, tp, first_ino);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Reallocate the space for if_broot based on the number of records
|
|
* being added or deleted as indicated in rec_diff. Move the records
|
|
* and pointers in if_broot to fit the new size. When shrinking this
|
|
* will eliminate holes between the records and pointers created by
|
|
* the caller. When growing this will create holes to be filled in
|
|
* by the caller.
|
|
*
|
|
* The caller must not request to add more records than would fit in
|
|
* the on-disk inode root. If the if_broot is currently NULL, then
|
|
* if we adding records one will be allocated. The caller must also
|
|
* not request that the number of records go below zero, although
|
|
* it can go to zero.
|
|
*
|
|
* ip -- the inode whose if_broot area is changing
|
|
* ext_diff -- the change in the number of records, positive or negative,
|
|
* requested for the if_broot array.
|
|
*/
|
|
void
|
|
xfs_iroot_realloc(
|
|
xfs_inode_t *ip,
|
|
int rec_diff,
|
|
int whichfork)
|
|
{
|
|
struct xfs_mount *mp = ip->i_mount;
|
|
int cur_max;
|
|
xfs_ifork_t *ifp;
|
|
struct xfs_btree_block *new_broot;
|
|
int new_max;
|
|
size_t new_size;
|
|
char *np;
|
|
char *op;
|
|
|
|
/*
|
|
* Handle the degenerate case quietly.
|
|
*/
|
|
if (rec_diff == 0) {
|
|
return;
|
|
}
|
|
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
if (rec_diff > 0) {
|
|
/*
|
|
* If there wasn't any memory allocated before, just
|
|
* allocate it now and get out.
|
|
*/
|
|
if (ifp->if_broot_bytes == 0) {
|
|
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(rec_diff);
|
|
ifp->if_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS);
|
|
ifp->if_broot_bytes = (int)new_size;
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* If there is already an existing if_broot, then we need
|
|
* to realloc() it and shift the pointers to their new
|
|
* location. The records don't change location because
|
|
* they are kept butted up against the btree block header.
|
|
*/
|
|
cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
|
|
new_max = cur_max + rec_diff;
|
|
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max);
|
|
ifp->if_broot = kmem_realloc(ifp->if_broot, new_size,
|
|
(size_t)XFS_BMAP_BROOT_SPACE_CALC(cur_max), /* old size */
|
|
KM_SLEEP | KM_NOFS);
|
|
op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
|
|
ifp->if_broot_bytes);
|
|
np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
|
|
(int)new_size);
|
|
ifp->if_broot_bytes = (int)new_size;
|
|
ASSERT(ifp->if_broot_bytes <=
|
|
XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ);
|
|
memmove(np, op, cur_max * (uint)sizeof(xfs_dfsbno_t));
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* rec_diff is less than 0. In this case, we are shrinking the
|
|
* if_broot buffer. It must already exist. If we go to zero
|
|
* records, just get rid of the root and clear the status bit.
|
|
*/
|
|
ASSERT((ifp->if_broot != NULL) && (ifp->if_broot_bytes > 0));
|
|
cur_max = xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0);
|
|
new_max = cur_max + rec_diff;
|
|
ASSERT(new_max >= 0);
|
|
if (new_max > 0)
|
|
new_size = (size_t)XFS_BMAP_BROOT_SPACE_CALC(new_max);
|
|
else
|
|
new_size = 0;
|
|
if (new_size > 0) {
|
|
new_broot = kmem_alloc(new_size, KM_SLEEP | KM_NOFS);
|
|
/*
|
|
* First copy over the btree block header.
|
|
*/
|
|
memcpy(new_broot, ifp->if_broot, XFS_BTREE_LBLOCK_LEN);
|
|
} else {
|
|
new_broot = NULL;
|
|
ifp->if_flags &= ~XFS_IFBROOT;
|
|
}
|
|
|
|
/*
|
|
* Only copy the records and pointers if there are any.
|
|
*/
|
|
if (new_max > 0) {
|
|
/*
|
|
* First copy the records.
|
|
*/
|
|
op = (char *)XFS_BMBT_REC_ADDR(mp, ifp->if_broot, 1);
|
|
np = (char *)XFS_BMBT_REC_ADDR(mp, new_broot, 1);
|
|
memcpy(np, op, new_max * (uint)sizeof(xfs_bmbt_rec_t));
|
|
|
|
/*
|
|
* Then copy the pointers.
|
|
*/
|
|
op = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, ifp->if_broot, 1,
|
|
ifp->if_broot_bytes);
|
|
np = (char *)XFS_BMAP_BROOT_PTR_ADDR(mp, new_broot, 1,
|
|
(int)new_size);
|
|
memcpy(np, op, new_max * (uint)sizeof(xfs_dfsbno_t));
|
|
}
|
|
kmem_free(ifp->if_broot);
|
|
ifp->if_broot = new_broot;
|
|
ifp->if_broot_bytes = (int)new_size;
|
|
ASSERT(ifp->if_broot_bytes <=
|
|
XFS_IFORK_SIZE(ip, whichfork) + XFS_BROOT_SIZE_ADJ);
|
|
return;
|
|
}
|
|
|
|
|
|
/*
|
|
* This is called when the amount of space needed for if_data
|
|
* is increased or decreased. The change in size is indicated by
|
|
* the number of bytes that need to be added or deleted in the
|
|
* byte_diff parameter.
|
|
*
|
|
* If the amount of space needed has decreased below the size of the
|
|
* inline buffer, then switch to using the inline buffer. Otherwise,
|
|
* use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
|
|
* to what is needed.
|
|
*
|
|
* ip -- the inode whose if_data area is changing
|
|
* byte_diff -- the change in the number of bytes, positive or negative,
|
|
* requested for the if_data array.
|
|
*/
|
|
void
|
|
xfs_idata_realloc(
|
|
xfs_inode_t *ip,
|
|
int byte_diff,
|
|
int whichfork)
|
|
{
|
|
xfs_ifork_t *ifp;
|
|
int new_size;
|
|
int real_size;
|
|
|
|
if (byte_diff == 0) {
|
|
return;
|
|
}
|
|
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
new_size = (int)ifp->if_bytes + byte_diff;
|
|
ASSERT(new_size >= 0);
|
|
|
|
if (new_size == 0) {
|
|
if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
|
|
kmem_free(ifp->if_u1.if_data);
|
|
}
|
|
ifp->if_u1.if_data = NULL;
|
|
real_size = 0;
|
|
} else if (new_size <= sizeof(ifp->if_u2.if_inline_data)) {
|
|
/*
|
|
* If the valid extents/data can fit in if_inline_ext/data,
|
|
* copy them from the malloc'd vector and free it.
|
|
*/
|
|
if (ifp->if_u1.if_data == NULL) {
|
|
ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
|
|
} else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
|
|
ASSERT(ifp->if_real_bytes != 0);
|
|
memcpy(ifp->if_u2.if_inline_data, ifp->if_u1.if_data,
|
|
new_size);
|
|
kmem_free(ifp->if_u1.if_data);
|
|
ifp->if_u1.if_data = ifp->if_u2.if_inline_data;
|
|
}
|
|
real_size = 0;
|
|
} else {
|
|
/*
|
|
* Stuck with malloc/realloc.
|
|
* For inline data, the underlying buffer must be
|
|
* a multiple of 4 bytes in size so that it can be
|
|
* logged and stay on word boundaries. We enforce
|
|
* that here.
|
|
*/
|
|
real_size = roundup(new_size, 4);
|
|
if (ifp->if_u1.if_data == NULL) {
|
|
ASSERT(ifp->if_real_bytes == 0);
|
|
ifp->if_u1.if_data = kmem_alloc(real_size,
|
|
KM_SLEEP | KM_NOFS);
|
|
} else if (ifp->if_u1.if_data != ifp->if_u2.if_inline_data) {
|
|
/*
|
|
* Only do the realloc if the underlying size
|
|
* is really changing.
|
|
*/
|
|
if (ifp->if_real_bytes != real_size) {
|
|
ifp->if_u1.if_data =
|
|
kmem_realloc(ifp->if_u1.if_data,
|
|
real_size,
|
|
ifp->if_real_bytes,
|
|
KM_SLEEP | KM_NOFS);
|
|
}
|
|
} else {
|
|
ASSERT(ifp->if_real_bytes == 0);
|
|
ifp->if_u1.if_data = kmem_alloc(real_size,
|
|
KM_SLEEP | KM_NOFS);
|
|
memcpy(ifp->if_u1.if_data, ifp->if_u2.if_inline_data,
|
|
ifp->if_bytes);
|
|
}
|
|
}
|
|
ifp->if_real_bytes = real_size;
|
|
ifp->if_bytes = new_size;
|
|
ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
|
|
}
|
|
|
|
void
|
|
xfs_idestroy_fork(
|
|
xfs_inode_t *ip,
|
|
int whichfork)
|
|
{
|
|
xfs_ifork_t *ifp;
|
|
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
if (ifp->if_broot != NULL) {
|
|
kmem_free(ifp->if_broot);
|
|
ifp->if_broot = NULL;
|
|
}
|
|
|
|
/*
|
|
* If the format is local, then we can't have an extents
|
|
* array so just look for an inline data array. If we're
|
|
* not local then we may or may not have an extents list,
|
|
* so check and free it up if we do.
|
|
*/
|
|
if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
|
|
if ((ifp->if_u1.if_data != ifp->if_u2.if_inline_data) &&
|
|
(ifp->if_u1.if_data != NULL)) {
|
|
ASSERT(ifp->if_real_bytes != 0);
|
|
kmem_free(ifp->if_u1.if_data);
|
|
ifp->if_u1.if_data = NULL;
|
|
ifp->if_real_bytes = 0;
|
|
}
|
|
} else if ((ifp->if_flags & XFS_IFEXTENTS) &&
|
|
((ifp->if_flags & XFS_IFEXTIREC) ||
|
|
((ifp->if_u1.if_extents != NULL) &&
|
|
(ifp->if_u1.if_extents != ifp->if_u2.if_inline_ext)))) {
|
|
ASSERT(ifp->if_real_bytes != 0);
|
|
xfs_iext_destroy(ifp);
|
|
}
|
|
ASSERT(ifp->if_u1.if_extents == NULL ||
|
|
ifp->if_u1.if_extents == ifp->if_u2.if_inline_ext);
|
|
ASSERT(ifp->if_real_bytes == 0);
|
|
if (whichfork == XFS_ATTR_FORK) {
|
|
kmem_zone_free(xfs_ifork_zone, ip->i_afp);
|
|
ip->i_afp = NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is called to unpin an inode. The caller must have the inode locked
|
|
* in at least shared mode so that the buffer cannot be subsequently pinned
|
|
* once someone is waiting for it to be unpinned.
|
|
*/
|
|
static void
|
|
xfs_iunpin_nowait(
|
|
struct xfs_inode *ip)
|
|
{
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
|
|
|
|
trace_xfs_inode_unpin_nowait(ip, _RET_IP_);
|
|
|
|
/* Give the log a push to start the unpinning I/O */
|
|
xfs_log_force_lsn(ip->i_mount, ip->i_itemp->ili_last_lsn, 0);
|
|
|
|
}
|
|
|
|
void
|
|
xfs_iunpin_wait(
|
|
struct xfs_inode *ip)
|
|
{
|
|
if (xfs_ipincount(ip)) {
|
|
xfs_iunpin_nowait(ip);
|
|
wait_event(ip->i_ipin_wait, (xfs_ipincount(ip) == 0));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* xfs_iextents_copy()
|
|
*
|
|
* This is called to copy the REAL extents (as opposed to the delayed
|
|
* allocation extents) from the inode into the given buffer. It
|
|
* returns the number of bytes copied into the buffer.
|
|
*
|
|
* If there are no delayed allocation extents, then we can just
|
|
* memcpy() the extents into the buffer. Otherwise, we need to
|
|
* examine each extent in turn and skip those which are delayed.
|
|
*/
|
|
int
|
|
xfs_iextents_copy(
|
|
xfs_inode_t *ip,
|
|
xfs_bmbt_rec_t *dp,
|
|
int whichfork)
|
|
{
|
|
int copied;
|
|
int i;
|
|
xfs_ifork_t *ifp;
|
|
int nrecs;
|
|
xfs_fsblock_t start_block;
|
|
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
|
|
ASSERT(ifp->if_bytes > 0);
|
|
|
|
nrecs = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
XFS_BMAP_TRACE_EXLIST(ip, nrecs, whichfork);
|
|
ASSERT(nrecs > 0);
|
|
|
|
/*
|
|
* There are some delayed allocation extents in the
|
|
* inode, so copy the extents one at a time and skip
|
|
* the delayed ones. There must be at least one
|
|
* non-delayed extent.
|
|
*/
|
|
copied = 0;
|
|
for (i = 0; i < nrecs; i++) {
|
|
xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, i);
|
|
start_block = xfs_bmbt_get_startblock(ep);
|
|
if (isnullstartblock(start_block)) {
|
|
/*
|
|
* It's a delayed allocation extent, so skip it.
|
|
*/
|
|
continue;
|
|
}
|
|
|
|
/* Translate to on disk format */
|
|
put_unaligned(cpu_to_be64(ep->l0), &dp->l0);
|
|
put_unaligned(cpu_to_be64(ep->l1), &dp->l1);
|
|
dp++;
|
|
copied++;
|
|
}
|
|
ASSERT(copied != 0);
|
|
xfs_validate_extents(ifp, copied, XFS_EXTFMT_INODE(ip));
|
|
|
|
return (copied * (uint)sizeof(xfs_bmbt_rec_t));
|
|
}
|
|
|
|
/*
|
|
* Each of the following cases stores data into the same region
|
|
* of the on-disk inode, so only one of them can be valid at
|
|
* any given time. While it is possible to have conflicting formats
|
|
* and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
|
|
* in EXTENTS format, this can only happen when the fork has
|
|
* changed formats after being modified but before being flushed.
|
|
* In these cases, the format always takes precedence, because the
|
|
* format indicates the current state of the fork.
|
|
*/
|
|
/*ARGSUSED*/
|
|
STATIC void
|
|
xfs_iflush_fork(
|
|
xfs_inode_t *ip,
|
|
xfs_dinode_t *dip,
|
|
xfs_inode_log_item_t *iip,
|
|
int whichfork,
|
|
xfs_buf_t *bp)
|
|
{
|
|
char *cp;
|
|
xfs_ifork_t *ifp;
|
|
xfs_mount_t *mp;
|
|
#ifdef XFS_TRANS_DEBUG
|
|
int first;
|
|
#endif
|
|
static const short brootflag[2] =
|
|
{ XFS_ILOG_DBROOT, XFS_ILOG_ABROOT };
|
|
static const short dataflag[2] =
|
|
{ XFS_ILOG_DDATA, XFS_ILOG_ADATA };
|
|
static const short extflag[2] =
|
|
{ XFS_ILOG_DEXT, XFS_ILOG_AEXT };
|
|
|
|
if (!iip)
|
|
return;
|
|
ifp = XFS_IFORK_PTR(ip, whichfork);
|
|
/*
|
|
* This can happen if we gave up in iformat in an error path,
|
|
* for the attribute fork.
|
|
*/
|
|
if (!ifp) {
|
|
ASSERT(whichfork == XFS_ATTR_FORK);
|
|
return;
|
|
}
|
|
cp = XFS_DFORK_PTR(dip, whichfork);
|
|
mp = ip->i_mount;
|
|
switch (XFS_IFORK_FORMAT(ip, whichfork)) {
|
|
case XFS_DINODE_FMT_LOCAL:
|
|
if ((iip->ili_format.ilf_fields & dataflag[whichfork]) &&
|
|
(ifp->if_bytes > 0)) {
|
|
ASSERT(ifp->if_u1.if_data != NULL);
|
|
ASSERT(ifp->if_bytes <= XFS_IFORK_SIZE(ip, whichfork));
|
|
memcpy(cp, ifp->if_u1.if_data, ifp->if_bytes);
|
|
}
|
|
break;
|
|
|
|
case XFS_DINODE_FMT_EXTENTS:
|
|
ASSERT((ifp->if_flags & XFS_IFEXTENTS) ||
|
|
!(iip->ili_format.ilf_fields & extflag[whichfork]));
|
|
ASSERT((xfs_iext_get_ext(ifp, 0) != NULL) ||
|
|
(ifp->if_bytes == 0));
|
|
ASSERT((xfs_iext_get_ext(ifp, 0) == NULL) ||
|
|
(ifp->if_bytes > 0));
|
|
if ((iip->ili_format.ilf_fields & extflag[whichfork]) &&
|
|
(ifp->if_bytes > 0)) {
|
|
ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) > 0);
|
|
(void)xfs_iextents_copy(ip, (xfs_bmbt_rec_t *)cp,
|
|
whichfork);
|
|
}
|
|
break;
|
|
|
|
case XFS_DINODE_FMT_BTREE:
|
|
if ((iip->ili_format.ilf_fields & brootflag[whichfork]) &&
|
|
(ifp->if_broot_bytes > 0)) {
|
|
ASSERT(ifp->if_broot != NULL);
|
|
ASSERT(ifp->if_broot_bytes <=
|
|
(XFS_IFORK_SIZE(ip, whichfork) +
|
|
XFS_BROOT_SIZE_ADJ));
|
|
xfs_bmbt_to_bmdr(mp, ifp->if_broot, ifp->if_broot_bytes,
|
|
(xfs_bmdr_block_t *)cp,
|
|
XFS_DFORK_SIZE(dip, mp, whichfork));
|
|
}
|
|
break;
|
|
|
|
case XFS_DINODE_FMT_DEV:
|
|
if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
|
|
ASSERT(whichfork == XFS_DATA_FORK);
|
|
xfs_dinode_put_rdev(dip, ip->i_df.if_u2.if_rdev);
|
|
}
|
|
break;
|
|
|
|
case XFS_DINODE_FMT_UUID:
|
|
if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
|
|
ASSERT(whichfork == XFS_DATA_FORK);
|
|
memcpy(XFS_DFORK_DPTR(dip),
|
|
&ip->i_df.if_u2.if_uuid,
|
|
sizeof(uuid_t));
|
|
}
|
|
break;
|
|
|
|
default:
|
|
ASSERT(0);
|
|
break;
|
|
}
|
|
}
|
|
|
|
STATIC int
|
|
xfs_iflush_cluster(
|
|
xfs_inode_t *ip,
|
|
xfs_buf_t *bp)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
struct xfs_perag *pag;
|
|
unsigned long first_index, mask;
|
|
unsigned long inodes_per_cluster;
|
|
int ilist_size;
|
|
xfs_inode_t **ilist;
|
|
xfs_inode_t *iq;
|
|
int nr_found;
|
|
int clcount = 0;
|
|
int bufwasdelwri;
|
|
int i;
|
|
|
|
pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
|
|
|
|
inodes_per_cluster = XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog;
|
|
ilist_size = inodes_per_cluster * sizeof(xfs_inode_t *);
|
|
ilist = kmem_alloc(ilist_size, KM_MAYFAIL|KM_NOFS);
|
|
if (!ilist)
|
|
goto out_put;
|
|
|
|
mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1);
|
|
first_index = XFS_INO_TO_AGINO(mp, ip->i_ino) & mask;
|
|
rcu_read_lock();
|
|
/* really need a gang lookup range call here */
|
|
nr_found = radix_tree_gang_lookup(&pag->pag_ici_root, (void**)ilist,
|
|
first_index, inodes_per_cluster);
|
|
if (nr_found == 0)
|
|
goto out_free;
|
|
|
|
for (i = 0; i < nr_found; i++) {
|
|
iq = ilist[i];
|
|
if (iq == ip)
|
|
continue;
|
|
|
|
/*
|
|
* because this is an RCU protected lookup, we could find a
|
|
* recently freed or even reallocated inode during the lookup.
|
|
* We need to check under the i_flags_lock for a valid inode
|
|
* here. Skip it if it is not valid or the wrong inode.
|
|
*/
|
|
spin_lock(&ip->i_flags_lock);
|
|
if (!ip->i_ino ||
|
|
(XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) != first_index) {
|
|
spin_unlock(&ip->i_flags_lock);
|
|
continue;
|
|
}
|
|
spin_unlock(&ip->i_flags_lock);
|
|
|
|
/*
|
|
* Do an un-protected check to see if the inode is dirty and
|
|
* is a candidate for flushing. These checks will be repeated
|
|
* later after the appropriate locks are acquired.
|
|
*/
|
|
if (xfs_inode_clean(iq) && xfs_ipincount(iq) == 0)
|
|
continue;
|
|
|
|
/*
|
|
* Try to get locks. If any are unavailable or it is pinned,
|
|
* then this inode cannot be flushed and is skipped.
|
|
*/
|
|
|
|
if (!xfs_ilock_nowait(iq, XFS_ILOCK_SHARED))
|
|
continue;
|
|
if (!xfs_iflock_nowait(iq)) {
|
|
xfs_iunlock(iq, XFS_ILOCK_SHARED);
|
|
continue;
|
|
}
|
|
if (xfs_ipincount(iq)) {
|
|
xfs_ifunlock(iq);
|
|
xfs_iunlock(iq, XFS_ILOCK_SHARED);
|
|
continue;
|
|
}
|
|
|
|
/*
|
|
* arriving here means that this inode can be flushed. First
|
|
* re-check that it's dirty before flushing.
|
|
*/
|
|
if (!xfs_inode_clean(iq)) {
|
|
int error;
|
|
error = xfs_iflush_int(iq, bp);
|
|
if (error) {
|
|
xfs_iunlock(iq, XFS_ILOCK_SHARED);
|
|
goto cluster_corrupt_out;
|
|
}
|
|
clcount++;
|
|
} else {
|
|
xfs_ifunlock(iq);
|
|
}
|
|
xfs_iunlock(iq, XFS_ILOCK_SHARED);
|
|
}
|
|
|
|
if (clcount) {
|
|
XFS_STATS_INC(xs_icluster_flushcnt);
|
|
XFS_STATS_ADD(xs_icluster_flushinode, clcount);
|
|
}
|
|
|
|
out_free:
|
|
rcu_read_unlock();
|
|
kmem_free(ilist);
|
|
out_put:
|
|
xfs_perag_put(pag);
|
|
return 0;
|
|
|
|
|
|
cluster_corrupt_out:
|
|
/*
|
|
* Corruption detected in the clustering loop. Invalidate the
|
|
* inode buffer and shut down the filesystem.
|
|
*/
|
|
rcu_read_unlock();
|
|
/*
|
|
* Clean up the buffer. If it was B_DELWRI, just release it --
|
|
* brelse can handle it with no problems. If not, shut down the
|
|
* filesystem before releasing the buffer.
|
|
*/
|
|
bufwasdelwri = XFS_BUF_ISDELAYWRITE(bp);
|
|
if (bufwasdelwri)
|
|
xfs_buf_relse(bp);
|
|
|
|
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
|
|
|
|
if (!bufwasdelwri) {
|
|
/*
|
|
* Just like incore_relse: if we have b_iodone functions,
|
|
* mark the buffer as an error and call them. Otherwise
|
|
* mark it as stale and brelse.
|
|
*/
|
|
if (XFS_BUF_IODONE_FUNC(bp)) {
|
|
XFS_BUF_UNDONE(bp);
|
|
XFS_BUF_STALE(bp);
|
|
XFS_BUF_ERROR(bp,EIO);
|
|
xfs_buf_ioend(bp, 0);
|
|
} else {
|
|
XFS_BUF_STALE(bp);
|
|
xfs_buf_relse(bp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Unlocks the flush lock
|
|
*/
|
|
xfs_iflush_abort(iq);
|
|
kmem_free(ilist);
|
|
xfs_perag_put(pag);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
/*
|
|
* xfs_iflush() will write a modified inode's changes out to the
|
|
* inode's on disk home. The caller must have the inode lock held
|
|
* in at least shared mode and the inode flush completion must be
|
|
* active as well. The inode lock will still be held upon return from
|
|
* the call and the caller is free to unlock it.
|
|
* The inode flush will be completed when the inode reaches the disk.
|
|
* The flags indicate how the inode's buffer should be written out.
|
|
*/
|
|
int
|
|
xfs_iflush(
|
|
xfs_inode_t *ip,
|
|
uint flags)
|
|
{
|
|
xfs_inode_log_item_t *iip;
|
|
xfs_buf_t *bp;
|
|
xfs_dinode_t *dip;
|
|
xfs_mount_t *mp;
|
|
int error;
|
|
|
|
XFS_STATS_INC(xs_iflush_count);
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
|
|
ASSERT(!completion_done(&ip->i_flush));
|
|
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
|
|
ip->i_d.di_nextents > ip->i_df.if_ext_max);
|
|
|
|
iip = ip->i_itemp;
|
|
mp = ip->i_mount;
|
|
|
|
/*
|
|
* We can't flush the inode until it is unpinned, so wait for it if we
|
|
* are allowed to block. We know noone new can pin it, because we are
|
|
* holding the inode lock shared and you need to hold it exclusively to
|
|
* pin the inode.
|
|
*
|
|
* If we are not allowed to block, force the log out asynchronously so
|
|
* that when we come back the inode will be unpinned. If other inodes
|
|
* in the same cluster are dirty, they will probably write the inode
|
|
* out for us if they occur after the log force completes.
|
|
*/
|
|
if (!(flags & SYNC_WAIT) && xfs_ipincount(ip)) {
|
|
xfs_iunpin_nowait(ip);
|
|
xfs_ifunlock(ip);
|
|
return EAGAIN;
|
|
}
|
|
xfs_iunpin_wait(ip);
|
|
|
|
/*
|
|
* For stale inodes we cannot rely on the backing buffer remaining
|
|
* stale in cache for the remaining life of the stale inode and so
|
|
* xfs_itobp() below may give us a buffer that no longer contains
|
|
* inodes below. We have to check this after ensuring the inode is
|
|
* unpinned so that it is safe to reclaim the stale inode after the
|
|
* flush call.
|
|
*/
|
|
if (xfs_iflags_test(ip, XFS_ISTALE)) {
|
|
xfs_ifunlock(ip);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* This may have been unpinned because the filesystem is shutting
|
|
* down forcibly. If that's the case we must not write this inode
|
|
* to disk, because the log record didn't make it to disk!
|
|
*/
|
|
if (XFS_FORCED_SHUTDOWN(mp)) {
|
|
ip->i_update_core = 0;
|
|
if (iip)
|
|
iip->ili_format.ilf_fields = 0;
|
|
xfs_ifunlock(ip);
|
|
return XFS_ERROR(EIO);
|
|
}
|
|
|
|
/*
|
|
* Get the buffer containing the on-disk inode.
|
|
*/
|
|
error = xfs_itobp(mp, NULL, ip, &dip, &bp,
|
|
(flags & SYNC_TRYLOCK) ? XBF_TRYLOCK : XBF_LOCK);
|
|
if (error || !bp) {
|
|
xfs_ifunlock(ip);
|
|
return error;
|
|
}
|
|
|
|
/*
|
|
* First flush out the inode that xfs_iflush was called with.
|
|
*/
|
|
error = xfs_iflush_int(ip, bp);
|
|
if (error)
|
|
goto corrupt_out;
|
|
|
|
/*
|
|
* If the buffer is pinned then push on the log now so we won't
|
|
* get stuck waiting in the write for too long.
|
|
*/
|
|
if (XFS_BUF_ISPINNED(bp))
|
|
xfs_log_force(mp, 0);
|
|
|
|
/*
|
|
* inode clustering:
|
|
* see if other inodes can be gathered into this write
|
|
*/
|
|
error = xfs_iflush_cluster(ip, bp);
|
|
if (error)
|
|
goto cluster_corrupt_out;
|
|
|
|
if (flags & SYNC_WAIT)
|
|
error = xfs_bwrite(mp, bp);
|
|
else
|
|
xfs_bdwrite(mp, bp);
|
|
return error;
|
|
|
|
corrupt_out:
|
|
xfs_buf_relse(bp);
|
|
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
|
|
cluster_corrupt_out:
|
|
/*
|
|
* Unlocks the flush lock
|
|
*/
|
|
xfs_iflush_abort(ip);
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
|
|
STATIC int
|
|
xfs_iflush_int(
|
|
xfs_inode_t *ip,
|
|
xfs_buf_t *bp)
|
|
{
|
|
xfs_inode_log_item_t *iip;
|
|
xfs_dinode_t *dip;
|
|
xfs_mount_t *mp;
|
|
#ifdef XFS_TRANS_DEBUG
|
|
int first;
|
|
#endif
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
|
|
ASSERT(!completion_done(&ip->i_flush));
|
|
ASSERT(ip->i_d.di_format != XFS_DINODE_FMT_BTREE ||
|
|
ip->i_d.di_nextents > ip->i_df.if_ext_max);
|
|
|
|
iip = ip->i_itemp;
|
|
mp = ip->i_mount;
|
|
|
|
/* set *dip = inode's place in the buffer */
|
|
dip = (xfs_dinode_t *)xfs_buf_offset(bp, ip->i_imap.im_boffset);
|
|
|
|
/*
|
|
* Clear i_update_core before copying out the data.
|
|
* This is for coordination with our timestamp updates
|
|
* that don't hold the inode lock. They will always
|
|
* update the timestamps BEFORE setting i_update_core,
|
|
* so if we clear i_update_core after they set it we
|
|
* are guaranteed to see their updates to the timestamps.
|
|
* I believe that this depends on strongly ordered memory
|
|
* semantics, but we have that. We use the SYNCHRONIZE
|
|
* macro to make sure that the compiler does not reorder
|
|
* the i_update_core access below the data copy below.
|
|
*/
|
|
ip->i_update_core = 0;
|
|
SYNCHRONIZE();
|
|
|
|
/*
|
|
* Make sure to get the latest timestamps from the Linux inode.
|
|
*/
|
|
xfs_synchronize_times(ip);
|
|
|
|
if (XFS_TEST_ERROR(be16_to_cpu(dip->di_magic) != XFS_DINODE_MAGIC,
|
|
mp, XFS_ERRTAG_IFLUSH_1, XFS_RANDOM_IFLUSH_1)) {
|
|
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
|
|
"%s: Bad inode %Lu magic number 0x%x, ptr 0x%p",
|
|
__func__, ip->i_ino, be16_to_cpu(dip->di_magic), dip);
|
|
goto corrupt_out;
|
|
}
|
|
if (XFS_TEST_ERROR(ip->i_d.di_magic != XFS_DINODE_MAGIC,
|
|
mp, XFS_ERRTAG_IFLUSH_2, XFS_RANDOM_IFLUSH_2)) {
|
|
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
|
|
"%s: Bad inode %Lu, ptr 0x%p, magic number 0x%x",
|
|
__func__, ip->i_ino, ip, ip->i_d.di_magic);
|
|
goto corrupt_out;
|
|
}
|
|
if ((ip->i_d.di_mode & S_IFMT) == S_IFREG) {
|
|
if (XFS_TEST_ERROR(
|
|
(ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
|
|
(ip->i_d.di_format != XFS_DINODE_FMT_BTREE),
|
|
mp, XFS_ERRTAG_IFLUSH_3, XFS_RANDOM_IFLUSH_3)) {
|
|
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
|
|
"%s: Bad regular inode %Lu, ptr 0x%p",
|
|
__func__, ip->i_ino, ip);
|
|
goto corrupt_out;
|
|
}
|
|
} else if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
|
|
if (XFS_TEST_ERROR(
|
|
(ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS) &&
|
|
(ip->i_d.di_format != XFS_DINODE_FMT_BTREE) &&
|
|
(ip->i_d.di_format != XFS_DINODE_FMT_LOCAL),
|
|
mp, XFS_ERRTAG_IFLUSH_4, XFS_RANDOM_IFLUSH_4)) {
|
|
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
|
|
"%s: Bad directory inode %Lu, ptr 0x%p",
|
|
__func__, ip->i_ino, ip);
|
|
goto corrupt_out;
|
|
}
|
|
}
|
|
if (XFS_TEST_ERROR(ip->i_d.di_nextents + ip->i_d.di_anextents >
|
|
ip->i_d.di_nblocks, mp, XFS_ERRTAG_IFLUSH_5,
|
|
XFS_RANDOM_IFLUSH_5)) {
|
|
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
|
|
"%s: detected corrupt incore inode %Lu, "
|
|
"total extents = %d, nblocks = %Ld, ptr 0x%p",
|
|
__func__, ip->i_ino,
|
|
ip->i_d.di_nextents + ip->i_d.di_anextents,
|
|
ip->i_d.di_nblocks, ip);
|
|
goto corrupt_out;
|
|
}
|
|
if (XFS_TEST_ERROR(ip->i_d.di_forkoff > mp->m_sb.sb_inodesize,
|
|
mp, XFS_ERRTAG_IFLUSH_6, XFS_RANDOM_IFLUSH_6)) {
|
|
xfs_alert_tag(mp, XFS_PTAG_IFLUSH,
|
|
"%s: bad inode %Lu, forkoff 0x%x, ptr 0x%p",
|
|
__func__, ip->i_ino, ip->i_d.di_forkoff, ip);
|
|
goto corrupt_out;
|
|
}
|
|
/*
|
|
* bump the flush iteration count, used to detect flushes which
|
|
* postdate a log record during recovery.
|
|
*/
|
|
|
|
ip->i_d.di_flushiter++;
|
|
|
|
/*
|
|
* Copy the dirty parts of the inode into the on-disk
|
|
* inode. We always copy out the core of the inode,
|
|
* because if the inode is dirty at all the core must
|
|
* be.
|
|
*/
|
|
xfs_dinode_to_disk(dip, &ip->i_d);
|
|
|
|
/* Wrap, we never let the log put out DI_MAX_FLUSH */
|
|
if (ip->i_d.di_flushiter == DI_MAX_FLUSH)
|
|
ip->i_d.di_flushiter = 0;
|
|
|
|
/*
|
|
* If this is really an old format inode and the superblock version
|
|
* has not been updated to support only new format inodes, then
|
|
* convert back to the old inode format. If the superblock version
|
|
* has been updated, then make the conversion permanent.
|
|
*/
|
|
ASSERT(ip->i_d.di_version == 1 || xfs_sb_version_hasnlink(&mp->m_sb));
|
|
if (ip->i_d.di_version == 1) {
|
|
if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
|
|
/*
|
|
* Convert it back.
|
|
*/
|
|
ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
|
|
dip->di_onlink = cpu_to_be16(ip->i_d.di_nlink);
|
|
} else {
|
|
/*
|
|
* The superblock version has already been bumped,
|
|
* so just make the conversion to the new inode
|
|
* format permanent.
|
|
*/
|
|
ip->i_d.di_version = 2;
|
|
dip->di_version = 2;
|
|
ip->i_d.di_onlink = 0;
|
|
dip->di_onlink = 0;
|
|
memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
|
|
memset(&(dip->di_pad[0]), 0,
|
|
sizeof(dip->di_pad));
|
|
ASSERT(xfs_get_projid(ip) == 0);
|
|
}
|
|
}
|
|
|
|
xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK, bp);
|
|
if (XFS_IFORK_Q(ip))
|
|
xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK, bp);
|
|
xfs_inobp_check(mp, bp);
|
|
|
|
/*
|
|
* We've recorded everything logged in the inode, so we'd
|
|
* like to clear the ilf_fields bits so we don't log and
|
|
* flush things unnecessarily. However, we can't stop
|
|
* logging all this information until the data we've copied
|
|
* into the disk buffer is written to disk. If we did we might
|
|
* overwrite the copy of the inode in the log with all the
|
|
* data after re-logging only part of it, and in the face of
|
|
* a crash we wouldn't have all the data we need to recover.
|
|
*
|
|
* What we do is move the bits to the ili_last_fields field.
|
|
* When logging the inode, these bits are moved back to the
|
|
* ilf_fields field. In the xfs_iflush_done() routine we
|
|
* clear ili_last_fields, since we know that the information
|
|
* those bits represent is permanently on disk. As long as
|
|
* the flush completes before the inode is logged again, then
|
|
* both ilf_fields and ili_last_fields will be cleared.
|
|
*
|
|
* We can play with the ilf_fields bits here, because the inode
|
|
* lock must be held exclusively in order to set bits there
|
|
* and the flush lock protects the ili_last_fields bits.
|
|
* Set ili_logged so the flush done
|
|
* routine can tell whether or not to look in the AIL.
|
|
* Also, store the current LSN of the inode so that we can tell
|
|
* whether the item has moved in the AIL from xfs_iflush_done().
|
|
* In order to read the lsn we need the AIL lock, because
|
|
* it is a 64 bit value that cannot be read atomically.
|
|
*/
|
|
if (iip != NULL && iip->ili_format.ilf_fields != 0) {
|
|
iip->ili_last_fields = iip->ili_format.ilf_fields;
|
|
iip->ili_format.ilf_fields = 0;
|
|
iip->ili_logged = 1;
|
|
|
|
xfs_trans_ail_copy_lsn(mp->m_ail, &iip->ili_flush_lsn,
|
|
&iip->ili_item.li_lsn);
|
|
|
|
/*
|
|
* Attach the function xfs_iflush_done to the inode's
|
|
* buffer. This will remove the inode from the AIL
|
|
* and unlock the inode's flush lock when the inode is
|
|
* completely written to disk.
|
|
*/
|
|
xfs_buf_attach_iodone(bp, xfs_iflush_done, &iip->ili_item);
|
|
|
|
ASSERT(XFS_BUF_FSPRIVATE(bp, void *) != NULL);
|
|
ASSERT(XFS_BUF_IODONE_FUNC(bp) != NULL);
|
|
} else {
|
|
/*
|
|
* We're flushing an inode which is not in the AIL and has
|
|
* not been logged but has i_update_core set. For this
|
|
* case we can use a B_DELWRI flush and immediately drop
|
|
* the inode flush lock because we can avoid the whole
|
|
* AIL state thing. It's OK to drop the flush lock now,
|
|
* because we've already locked the buffer and to do anything
|
|
* you really need both.
|
|
*/
|
|
if (iip != NULL) {
|
|
ASSERT(iip->ili_logged == 0);
|
|
ASSERT(iip->ili_last_fields == 0);
|
|
ASSERT((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0);
|
|
}
|
|
xfs_ifunlock(ip);
|
|
}
|
|
|
|
return 0;
|
|
|
|
corrupt_out:
|
|
return XFS_ERROR(EFSCORRUPTED);
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to the extent record at file index idx.
|
|
*/
|
|
xfs_bmbt_rec_host_t *
|
|
xfs_iext_get_ext(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_extnum_t idx) /* index of target extent */
|
|
{
|
|
ASSERT(idx >= 0);
|
|
if ((ifp->if_flags & XFS_IFEXTIREC) && (idx == 0)) {
|
|
return ifp->if_u1.if_ext_irec->er_extbuf;
|
|
} else if (ifp->if_flags & XFS_IFEXTIREC) {
|
|
xfs_ext_irec_t *erp; /* irec pointer */
|
|
int erp_idx = 0; /* irec index */
|
|
xfs_extnum_t page_idx = idx; /* ext index in target list */
|
|
|
|
erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
|
|
return &erp->er_extbuf[page_idx];
|
|
} else if (ifp->if_bytes) {
|
|
return &ifp->if_u1.if_extents[idx];
|
|
} else {
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Insert new item(s) into the extent records for incore inode
|
|
* fork 'ifp'. 'count' new items are inserted at index 'idx'.
|
|
*/
|
|
void
|
|
xfs_iext_insert(
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
xfs_extnum_t idx, /* starting index of new items */
|
|
xfs_extnum_t count, /* number of inserted items */
|
|
xfs_bmbt_irec_t *new, /* items to insert */
|
|
int state) /* type of extent conversion */
|
|
{
|
|
xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df;
|
|
xfs_extnum_t i; /* extent record index */
|
|
|
|
trace_xfs_iext_insert(ip, idx, new, state, _RET_IP_);
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
|
|
xfs_iext_add(ifp, idx, count);
|
|
for (i = idx; i < idx + count; i++, new++)
|
|
xfs_bmbt_set_all(xfs_iext_get_ext(ifp, i), new);
|
|
}
|
|
|
|
/*
|
|
* This is called when the amount of space required for incore file
|
|
* extents needs to be increased. The ext_diff parameter stores the
|
|
* number of new extents being added and the idx parameter contains
|
|
* the extent index where the new extents will be added. If the new
|
|
* extents are being appended, then we just need to (re)allocate and
|
|
* initialize the space. Otherwise, if the new extents are being
|
|
* inserted into the middle of the existing entries, a bit more work
|
|
* is required to make room for the new extents to be inserted. The
|
|
* caller is responsible for filling in the new extent entries upon
|
|
* return.
|
|
*/
|
|
void
|
|
xfs_iext_add(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_extnum_t idx, /* index to begin adding exts */
|
|
int ext_diff) /* number of extents to add */
|
|
{
|
|
int byte_diff; /* new bytes being added */
|
|
int new_size; /* size of extents after adding */
|
|
xfs_extnum_t nextents; /* number of extents in file */
|
|
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
ASSERT((idx >= 0) && (idx <= nextents));
|
|
byte_diff = ext_diff * sizeof(xfs_bmbt_rec_t);
|
|
new_size = ifp->if_bytes + byte_diff;
|
|
/*
|
|
* If the new number of extents (nextents + ext_diff)
|
|
* fits inside the inode, then continue to use the inline
|
|
* extent buffer.
|
|
*/
|
|
if (nextents + ext_diff <= XFS_INLINE_EXTS) {
|
|
if (idx < nextents) {
|
|
memmove(&ifp->if_u2.if_inline_ext[idx + ext_diff],
|
|
&ifp->if_u2.if_inline_ext[idx],
|
|
(nextents - idx) * sizeof(xfs_bmbt_rec_t));
|
|
memset(&ifp->if_u2.if_inline_ext[idx], 0, byte_diff);
|
|
}
|
|
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
|
|
ifp->if_real_bytes = 0;
|
|
ifp->if_lastex = nextents + ext_diff;
|
|
}
|
|
/*
|
|
* Otherwise use a linear (direct) extent list.
|
|
* If the extents are currently inside the inode,
|
|
* xfs_iext_realloc_direct will switch us from
|
|
* inline to direct extent allocation mode.
|
|
*/
|
|
else if (nextents + ext_diff <= XFS_LINEAR_EXTS) {
|
|
xfs_iext_realloc_direct(ifp, new_size);
|
|
if (idx < nextents) {
|
|
memmove(&ifp->if_u1.if_extents[idx + ext_diff],
|
|
&ifp->if_u1.if_extents[idx],
|
|
(nextents - idx) * sizeof(xfs_bmbt_rec_t));
|
|
memset(&ifp->if_u1.if_extents[idx], 0, byte_diff);
|
|
}
|
|
}
|
|
/* Indirection array */
|
|
else {
|
|
xfs_ext_irec_t *erp;
|
|
int erp_idx = 0;
|
|
int page_idx = idx;
|
|
|
|
ASSERT(nextents + ext_diff > XFS_LINEAR_EXTS);
|
|
if (ifp->if_flags & XFS_IFEXTIREC) {
|
|
erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 1);
|
|
} else {
|
|
xfs_iext_irec_init(ifp);
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
erp = ifp->if_u1.if_ext_irec;
|
|
}
|
|
/* Extents fit in target extent page */
|
|
if (erp && erp->er_extcount + ext_diff <= XFS_LINEAR_EXTS) {
|
|
if (page_idx < erp->er_extcount) {
|
|
memmove(&erp->er_extbuf[page_idx + ext_diff],
|
|
&erp->er_extbuf[page_idx],
|
|
(erp->er_extcount - page_idx) *
|
|
sizeof(xfs_bmbt_rec_t));
|
|
memset(&erp->er_extbuf[page_idx], 0, byte_diff);
|
|
}
|
|
erp->er_extcount += ext_diff;
|
|
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
|
|
}
|
|
/* Insert a new extent page */
|
|
else if (erp) {
|
|
xfs_iext_add_indirect_multi(ifp,
|
|
erp_idx, page_idx, ext_diff);
|
|
}
|
|
/*
|
|
* If extent(s) are being appended to the last page in
|
|
* the indirection array and the new extent(s) don't fit
|
|
* in the page, then erp is NULL and erp_idx is set to
|
|
* the next index needed in the indirection array.
|
|
*/
|
|
else {
|
|
int count = ext_diff;
|
|
|
|
while (count) {
|
|
erp = xfs_iext_irec_new(ifp, erp_idx);
|
|
erp->er_extcount = count;
|
|
count -= MIN(count, (int)XFS_LINEAR_EXTS);
|
|
if (count) {
|
|
erp_idx++;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
ifp->if_bytes = new_size;
|
|
}
|
|
|
|
/*
|
|
* This is called when incore extents are being added to the indirection
|
|
* array and the new extents do not fit in the target extent list. The
|
|
* erp_idx parameter contains the irec index for the target extent list
|
|
* in the indirection array, and the idx parameter contains the extent
|
|
* index within the list. The number of extents being added is stored
|
|
* in the count parameter.
|
|
*
|
|
* |-------| |-------|
|
|
* | | | | idx - number of extents before idx
|
|
* | idx | | count |
|
|
* | | | | count - number of extents being inserted at idx
|
|
* |-------| |-------|
|
|
* | count | | nex2 | nex2 - number of extents after idx + count
|
|
* |-------| |-------|
|
|
*/
|
|
void
|
|
xfs_iext_add_indirect_multi(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
int erp_idx, /* target extent irec index */
|
|
xfs_extnum_t idx, /* index within target list */
|
|
int count) /* new extents being added */
|
|
{
|
|
int byte_diff; /* new bytes being added */
|
|
xfs_ext_irec_t *erp; /* pointer to irec entry */
|
|
xfs_extnum_t ext_diff; /* number of extents to add */
|
|
xfs_extnum_t ext_cnt; /* new extents still needed */
|
|
xfs_extnum_t nex2; /* extents after idx + count */
|
|
xfs_bmbt_rec_t *nex2_ep = NULL; /* temp list for nex2 extents */
|
|
int nlists; /* number of irec's (lists) */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
erp = &ifp->if_u1.if_ext_irec[erp_idx];
|
|
nex2 = erp->er_extcount - idx;
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
|
|
/*
|
|
* Save second part of target extent list
|
|
* (all extents past */
|
|
if (nex2) {
|
|
byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
|
|
nex2_ep = (xfs_bmbt_rec_t *) kmem_alloc(byte_diff, KM_NOFS);
|
|
memmove(nex2_ep, &erp->er_extbuf[idx], byte_diff);
|
|
erp->er_extcount -= nex2;
|
|
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -nex2);
|
|
memset(&erp->er_extbuf[idx], 0, byte_diff);
|
|
}
|
|
|
|
/*
|
|
* Add the new extents to the end of the target
|
|
* list, then allocate new irec record(s) and
|
|
* extent buffer(s) as needed to store the rest
|
|
* of the new extents.
|
|
*/
|
|
ext_cnt = count;
|
|
ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS - erp->er_extcount);
|
|
if (ext_diff) {
|
|
erp->er_extcount += ext_diff;
|
|
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
|
|
ext_cnt -= ext_diff;
|
|
}
|
|
while (ext_cnt) {
|
|
erp_idx++;
|
|
erp = xfs_iext_irec_new(ifp, erp_idx);
|
|
ext_diff = MIN(ext_cnt, (int)XFS_LINEAR_EXTS);
|
|
erp->er_extcount = ext_diff;
|
|
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, ext_diff);
|
|
ext_cnt -= ext_diff;
|
|
}
|
|
|
|
/* Add nex2 extents back to indirection array */
|
|
if (nex2) {
|
|
xfs_extnum_t ext_avail;
|
|
int i;
|
|
|
|
byte_diff = nex2 * sizeof(xfs_bmbt_rec_t);
|
|
ext_avail = XFS_LINEAR_EXTS - erp->er_extcount;
|
|
i = 0;
|
|
/*
|
|
* If nex2 extents fit in the current page, append
|
|
* nex2_ep after the new extents.
|
|
*/
|
|
if (nex2 <= ext_avail) {
|
|
i = erp->er_extcount;
|
|
}
|
|
/*
|
|
* Otherwise, check if space is available in the
|
|
* next page.
|
|
*/
|
|
else if ((erp_idx < nlists - 1) &&
|
|
(nex2 <= (ext_avail = XFS_LINEAR_EXTS -
|
|
ifp->if_u1.if_ext_irec[erp_idx+1].er_extcount))) {
|
|
erp_idx++;
|
|
erp++;
|
|
/* Create a hole for nex2 extents */
|
|
memmove(&erp->er_extbuf[nex2], erp->er_extbuf,
|
|
erp->er_extcount * sizeof(xfs_bmbt_rec_t));
|
|
}
|
|
/*
|
|
* Final choice, create a new extent page for
|
|
* nex2 extents.
|
|
*/
|
|
else {
|
|
erp_idx++;
|
|
erp = xfs_iext_irec_new(ifp, erp_idx);
|
|
}
|
|
memmove(&erp->er_extbuf[i], nex2_ep, byte_diff);
|
|
kmem_free(nex2_ep);
|
|
erp->er_extcount += nex2;
|
|
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, nex2);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is called when the amount of space required for incore file
|
|
* extents needs to be decreased. The ext_diff parameter stores the
|
|
* number of extents to be removed and the idx parameter contains
|
|
* the extent index where the extents will be removed from.
|
|
*
|
|
* If the amount of space needed has decreased below the linear
|
|
* limit, XFS_IEXT_BUFSZ, then switch to using the contiguous
|
|
* extent array. Otherwise, use kmem_realloc() to adjust the
|
|
* size to what is needed.
|
|
*/
|
|
void
|
|
xfs_iext_remove(
|
|
xfs_inode_t *ip, /* incore inode pointer */
|
|
xfs_extnum_t idx, /* index to begin removing exts */
|
|
int ext_diff, /* number of extents to remove */
|
|
int state) /* type of extent conversion */
|
|
{
|
|
xfs_ifork_t *ifp = (state & BMAP_ATTRFORK) ? ip->i_afp : &ip->i_df;
|
|
xfs_extnum_t nextents; /* number of extents in file */
|
|
int new_size; /* size of extents after removal */
|
|
|
|
trace_xfs_iext_remove(ip, idx, state, _RET_IP_);
|
|
|
|
ASSERT(ext_diff > 0);
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
new_size = (nextents - ext_diff) * sizeof(xfs_bmbt_rec_t);
|
|
|
|
if (new_size == 0) {
|
|
xfs_iext_destroy(ifp);
|
|
} else if (ifp->if_flags & XFS_IFEXTIREC) {
|
|
xfs_iext_remove_indirect(ifp, idx, ext_diff);
|
|
} else if (ifp->if_real_bytes) {
|
|
xfs_iext_remove_direct(ifp, idx, ext_diff);
|
|
} else {
|
|
xfs_iext_remove_inline(ifp, idx, ext_diff);
|
|
}
|
|
ifp->if_bytes = new_size;
|
|
}
|
|
|
|
/*
|
|
* This removes ext_diff extents from the inline buffer, beginning
|
|
* at extent index idx.
|
|
*/
|
|
void
|
|
xfs_iext_remove_inline(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_extnum_t idx, /* index to begin removing exts */
|
|
int ext_diff) /* number of extents to remove */
|
|
{
|
|
int nextents; /* number of extents in file */
|
|
|
|
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
|
|
ASSERT(idx < XFS_INLINE_EXTS);
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
ASSERT(((nextents - ext_diff) > 0) &&
|
|
(nextents - ext_diff) < XFS_INLINE_EXTS);
|
|
|
|
if (idx + ext_diff < nextents) {
|
|
memmove(&ifp->if_u2.if_inline_ext[idx],
|
|
&ifp->if_u2.if_inline_ext[idx + ext_diff],
|
|
(nextents - (idx + ext_diff)) *
|
|
sizeof(xfs_bmbt_rec_t));
|
|
memset(&ifp->if_u2.if_inline_ext[nextents - ext_diff],
|
|
0, ext_diff * sizeof(xfs_bmbt_rec_t));
|
|
} else {
|
|
memset(&ifp->if_u2.if_inline_ext[idx], 0,
|
|
ext_diff * sizeof(xfs_bmbt_rec_t));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This removes ext_diff extents from a linear (direct) extent list,
|
|
* beginning at extent index idx. If the extents are being removed
|
|
* from the end of the list (ie. truncate) then we just need to re-
|
|
* allocate the list to remove the extra space. Otherwise, if the
|
|
* extents are being removed from the middle of the existing extent
|
|
* entries, then we first need to move the extent records beginning
|
|
* at idx + ext_diff up in the list to overwrite the records being
|
|
* removed, then remove the extra space via kmem_realloc.
|
|
*/
|
|
void
|
|
xfs_iext_remove_direct(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_extnum_t idx, /* index to begin removing exts */
|
|
int ext_diff) /* number of extents to remove */
|
|
{
|
|
xfs_extnum_t nextents; /* number of extents in file */
|
|
int new_size; /* size of extents after removal */
|
|
|
|
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
|
|
new_size = ifp->if_bytes -
|
|
(ext_diff * sizeof(xfs_bmbt_rec_t));
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
|
|
if (new_size == 0) {
|
|
xfs_iext_destroy(ifp);
|
|
return;
|
|
}
|
|
/* Move extents up in the list (if needed) */
|
|
if (idx + ext_diff < nextents) {
|
|
memmove(&ifp->if_u1.if_extents[idx],
|
|
&ifp->if_u1.if_extents[idx + ext_diff],
|
|
(nextents - (idx + ext_diff)) *
|
|
sizeof(xfs_bmbt_rec_t));
|
|
}
|
|
memset(&ifp->if_u1.if_extents[nextents - ext_diff],
|
|
0, ext_diff * sizeof(xfs_bmbt_rec_t));
|
|
/*
|
|
* Reallocate the direct extent list. If the extents
|
|
* will fit inside the inode then xfs_iext_realloc_direct
|
|
* will switch from direct to inline extent allocation
|
|
* mode for us.
|
|
*/
|
|
xfs_iext_realloc_direct(ifp, new_size);
|
|
ifp->if_bytes = new_size;
|
|
}
|
|
|
|
/*
|
|
* This is called when incore extents are being removed from the
|
|
* indirection array and the extents being removed span multiple extent
|
|
* buffers. The idx parameter contains the file extent index where we
|
|
* want to begin removing extents, and the count parameter contains
|
|
* how many extents need to be removed.
|
|
*
|
|
* |-------| |-------|
|
|
* | nex1 | | | nex1 - number of extents before idx
|
|
* |-------| | count |
|
|
* | | | | count - number of extents being removed at idx
|
|
* | count | |-------|
|
|
* | | | nex2 | nex2 - number of extents after idx + count
|
|
* |-------| |-------|
|
|
*/
|
|
void
|
|
xfs_iext_remove_indirect(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_extnum_t idx, /* index to begin removing extents */
|
|
int count) /* number of extents to remove */
|
|
{
|
|
xfs_ext_irec_t *erp; /* indirection array pointer */
|
|
int erp_idx = 0; /* indirection array index */
|
|
xfs_extnum_t ext_cnt; /* extents left to remove */
|
|
xfs_extnum_t ext_diff; /* extents to remove in current list */
|
|
xfs_extnum_t nex1; /* number of extents before idx */
|
|
xfs_extnum_t nex2; /* extents after idx + count */
|
|
int page_idx = idx; /* index in target extent list */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
erp = xfs_iext_idx_to_irec(ifp, &page_idx, &erp_idx, 0);
|
|
ASSERT(erp != NULL);
|
|
nex1 = page_idx;
|
|
ext_cnt = count;
|
|
while (ext_cnt) {
|
|
nex2 = MAX((erp->er_extcount - (nex1 + ext_cnt)), 0);
|
|
ext_diff = MIN(ext_cnt, (erp->er_extcount - nex1));
|
|
/*
|
|
* Check for deletion of entire list;
|
|
* xfs_iext_irec_remove() updates extent offsets.
|
|
*/
|
|
if (ext_diff == erp->er_extcount) {
|
|
xfs_iext_irec_remove(ifp, erp_idx);
|
|
ext_cnt -= ext_diff;
|
|
nex1 = 0;
|
|
if (ext_cnt) {
|
|
ASSERT(erp_idx < ifp->if_real_bytes /
|
|
XFS_IEXT_BUFSZ);
|
|
erp = &ifp->if_u1.if_ext_irec[erp_idx];
|
|
nex1 = 0;
|
|
continue;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
/* Move extents up (if needed) */
|
|
if (nex2) {
|
|
memmove(&erp->er_extbuf[nex1],
|
|
&erp->er_extbuf[nex1 + ext_diff],
|
|
nex2 * sizeof(xfs_bmbt_rec_t));
|
|
}
|
|
/* Zero out rest of page */
|
|
memset(&erp->er_extbuf[nex1 + nex2], 0, (XFS_IEXT_BUFSZ -
|
|
((nex1 + nex2) * sizeof(xfs_bmbt_rec_t))));
|
|
/* Update remaining counters */
|
|
erp->er_extcount -= ext_diff;
|
|
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1, -ext_diff);
|
|
ext_cnt -= ext_diff;
|
|
nex1 = 0;
|
|
erp_idx++;
|
|
erp++;
|
|
}
|
|
ifp->if_bytes -= count * sizeof(xfs_bmbt_rec_t);
|
|
xfs_iext_irec_compact(ifp);
|
|
}
|
|
|
|
/*
|
|
* Create, destroy, or resize a linear (direct) block of extents.
|
|
*/
|
|
void
|
|
xfs_iext_realloc_direct(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
int new_size) /* new size of extents */
|
|
{
|
|
int rnew_size; /* real new size of extents */
|
|
|
|
rnew_size = new_size;
|
|
|
|
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC) ||
|
|
((new_size >= 0) && (new_size <= XFS_IEXT_BUFSZ) &&
|
|
(new_size != ifp->if_real_bytes)));
|
|
|
|
/* Free extent records */
|
|
if (new_size == 0) {
|
|
xfs_iext_destroy(ifp);
|
|
}
|
|
/* Resize direct extent list and zero any new bytes */
|
|
else if (ifp->if_real_bytes) {
|
|
/* Check if extents will fit inside the inode */
|
|
if (new_size <= XFS_INLINE_EXTS * sizeof(xfs_bmbt_rec_t)) {
|
|
xfs_iext_direct_to_inline(ifp, new_size /
|
|
(uint)sizeof(xfs_bmbt_rec_t));
|
|
ifp->if_bytes = new_size;
|
|
return;
|
|
}
|
|
if (!is_power_of_2(new_size)){
|
|
rnew_size = roundup_pow_of_two(new_size);
|
|
}
|
|
if (rnew_size != ifp->if_real_bytes) {
|
|
ifp->if_u1.if_extents =
|
|
kmem_realloc(ifp->if_u1.if_extents,
|
|
rnew_size,
|
|
ifp->if_real_bytes, KM_NOFS);
|
|
}
|
|
if (rnew_size > ifp->if_real_bytes) {
|
|
memset(&ifp->if_u1.if_extents[ifp->if_bytes /
|
|
(uint)sizeof(xfs_bmbt_rec_t)], 0,
|
|
rnew_size - ifp->if_real_bytes);
|
|
}
|
|
}
|
|
/*
|
|
* Switch from the inline extent buffer to a direct
|
|
* extent list. Be sure to include the inline extent
|
|
* bytes in new_size.
|
|
*/
|
|
else {
|
|
new_size += ifp->if_bytes;
|
|
if (!is_power_of_2(new_size)) {
|
|
rnew_size = roundup_pow_of_two(new_size);
|
|
}
|
|
xfs_iext_inline_to_direct(ifp, rnew_size);
|
|
}
|
|
ifp->if_real_bytes = rnew_size;
|
|
ifp->if_bytes = new_size;
|
|
}
|
|
|
|
/*
|
|
* Switch from linear (direct) extent records to inline buffer.
|
|
*/
|
|
void
|
|
xfs_iext_direct_to_inline(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_extnum_t nextents) /* number of extents in file */
|
|
{
|
|
ASSERT(ifp->if_flags & XFS_IFEXTENTS);
|
|
ASSERT(nextents <= XFS_INLINE_EXTS);
|
|
/*
|
|
* The inline buffer was zeroed when we switched
|
|
* from inline to direct extent allocation mode,
|
|
* so we don't need to clear it here.
|
|
*/
|
|
memcpy(ifp->if_u2.if_inline_ext, ifp->if_u1.if_extents,
|
|
nextents * sizeof(xfs_bmbt_rec_t));
|
|
kmem_free(ifp->if_u1.if_extents);
|
|
ifp->if_u1.if_extents = ifp->if_u2.if_inline_ext;
|
|
ifp->if_real_bytes = 0;
|
|
}
|
|
|
|
/*
|
|
* Switch from inline buffer to linear (direct) extent records.
|
|
* new_size should already be rounded up to the next power of 2
|
|
* by the caller (when appropriate), so use new_size as it is.
|
|
* However, since new_size may be rounded up, we can't update
|
|
* if_bytes here. It is the caller's responsibility to update
|
|
* if_bytes upon return.
|
|
*/
|
|
void
|
|
xfs_iext_inline_to_direct(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
int new_size) /* number of extents in file */
|
|
{
|
|
ifp->if_u1.if_extents = kmem_alloc(new_size, KM_NOFS);
|
|
memset(ifp->if_u1.if_extents, 0, new_size);
|
|
if (ifp->if_bytes) {
|
|
memcpy(ifp->if_u1.if_extents, ifp->if_u2.if_inline_ext,
|
|
ifp->if_bytes);
|
|
memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
|
|
sizeof(xfs_bmbt_rec_t));
|
|
}
|
|
ifp->if_real_bytes = new_size;
|
|
}
|
|
|
|
/*
|
|
* Resize an extent indirection array to new_size bytes.
|
|
*/
|
|
STATIC void
|
|
xfs_iext_realloc_indirect(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
int new_size) /* new indirection array size */
|
|
{
|
|
int nlists; /* number of irec's (ex lists) */
|
|
int size; /* current indirection array size */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
size = nlists * sizeof(xfs_ext_irec_t);
|
|
ASSERT(ifp->if_real_bytes);
|
|
ASSERT((new_size >= 0) && (new_size != size));
|
|
if (new_size == 0) {
|
|
xfs_iext_destroy(ifp);
|
|
} else {
|
|
ifp->if_u1.if_ext_irec = (xfs_ext_irec_t *)
|
|
kmem_realloc(ifp->if_u1.if_ext_irec,
|
|
new_size, size, KM_NOFS);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Switch from indirection array to linear (direct) extent allocations.
|
|
*/
|
|
STATIC void
|
|
xfs_iext_indirect_to_direct(
|
|
xfs_ifork_t *ifp) /* inode fork pointer */
|
|
{
|
|
xfs_bmbt_rec_host_t *ep; /* extent record pointer */
|
|
xfs_extnum_t nextents; /* number of extents in file */
|
|
int size; /* size of file extents */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
ASSERT(nextents <= XFS_LINEAR_EXTS);
|
|
size = nextents * sizeof(xfs_bmbt_rec_t);
|
|
|
|
xfs_iext_irec_compact_pages(ifp);
|
|
ASSERT(ifp->if_real_bytes == XFS_IEXT_BUFSZ);
|
|
|
|
ep = ifp->if_u1.if_ext_irec->er_extbuf;
|
|
kmem_free(ifp->if_u1.if_ext_irec);
|
|
ifp->if_flags &= ~XFS_IFEXTIREC;
|
|
ifp->if_u1.if_extents = ep;
|
|
ifp->if_bytes = size;
|
|
if (nextents < XFS_LINEAR_EXTS) {
|
|
xfs_iext_realloc_direct(ifp, size);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Free incore file extents.
|
|
*/
|
|
void
|
|
xfs_iext_destroy(
|
|
xfs_ifork_t *ifp) /* inode fork pointer */
|
|
{
|
|
if (ifp->if_flags & XFS_IFEXTIREC) {
|
|
int erp_idx;
|
|
int nlists;
|
|
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
for (erp_idx = nlists - 1; erp_idx >= 0 ; erp_idx--) {
|
|
xfs_iext_irec_remove(ifp, erp_idx);
|
|
}
|
|
ifp->if_flags &= ~XFS_IFEXTIREC;
|
|
} else if (ifp->if_real_bytes) {
|
|
kmem_free(ifp->if_u1.if_extents);
|
|
} else if (ifp->if_bytes) {
|
|
memset(ifp->if_u2.if_inline_ext, 0, XFS_INLINE_EXTS *
|
|
sizeof(xfs_bmbt_rec_t));
|
|
}
|
|
ifp->if_u1.if_extents = NULL;
|
|
ifp->if_real_bytes = 0;
|
|
ifp->if_bytes = 0;
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to the extent record for file system block bno.
|
|
*/
|
|
xfs_bmbt_rec_host_t * /* pointer to found extent record */
|
|
xfs_iext_bno_to_ext(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_fileoff_t bno, /* block number to search for */
|
|
xfs_extnum_t *idxp) /* index of target extent */
|
|
{
|
|
xfs_bmbt_rec_host_t *base; /* pointer to first extent */
|
|
xfs_filblks_t blockcount = 0; /* number of blocks in extent */
|
|
xfs_bmbt_rec_host_t *ep = NULL; /* pointer to target extent */
|
|
xfs_ext_irec_t *erp = NULL; /* indirection array pointer */
|
|
int high; /* upper boundary in search */
|
|
xfs_extnum_t idx = 0; /* index of target extent */
|
|
int low; /* lower boundary in search */
|
|
xfs_extnum_t nextents; /* number of file extents */
|
|
xfs_fileoff_t startoff = 0; /* start offset of extent */
|
|
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
if (nextents == 0) {
|
|
*idxp = 0;
|
|
return NULL;
|
|
}
|
|
low = 0;
|
|
if (ifp->if_flags & XFS_IFEXTIREC) {
|
|
/* Find target extent list */
|
|
int erp_idx = 0;
|
|
erp = xfs_iext_bno_to_irec(ifp, bno, &erp_idx);
|
|
base = erp->er_extbuf;
|
|
high = erp->er_extcount - 1;
|
|
} else {
|
|
base = ifp->if_u1.if_extents;
|
|
high = nextents - 1;
|
|
}
|
|
/* Binary search extent records */
|
|
while (low <= high) {
|
|
idx = (low + high) >> 1;
|
|
ep = base + idx;
|
|
startoff = xfs_bmbt_get_startoff(ep);
|
|
blockcount = xfs_bmbt_get_blockcount(ep);
|
|
if (bno < startoff) {
|
|
high = idx - 1;
|
|
} else if (bno >= startoff + blockcount) {
|
|
low = idx + 1;
|
|
} else {
|
|
/* Convert back to file-based extent index */
|
|
if (ifp->if_flags & XFS_IFEXTIREC) {
|
|
idx += erp->er_extoff;
|
|
}
|
|
*idxp = idx;
|
|
return ep;
|
|
}
|
|
}
|
|
/* Convert back to file-based extent index */
|
|
if (ifp->if_flags & XFS_IFEXTIREC) {
|
|
idx += erp->er_extoff;
|
|
}
|
|
if (bno >= startoff + blockcount) {
|
|
if (++idx == nextents) {
|
|
ep = NULL;
|
|
} else {
|
|
ep = xfs_iext_get_ext(ifp, idx);
|
|
}
|
|
}
|
|
*idxp = idx;
|
|
return ep;
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to the indirection array entry containing the
|
|
* extent record for filesystem block bno. Store the index of the
|
|
* target irec in *erp_idxp.
|
|
*/
|
|
xfs_ext_irec_t * /* pointer to found extent record */
|
|
xfs_iext_bno_to_irec(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_fileoff_t bno, /* block number to search for */
|
|
int *erp_idxp) /* irec index of target ext list */
|
|
{
|
|
xfs_ext_irec_t *erp = NULL; /* indirection array pointer */
|
|
xfs_ext_irec_t *erp_next; /* next indirection array entry */
|
|
int erp_idx; /* indirection array index */
|
|
int nlists; /* number of extent irec's (lists) */
|
|
int high; /* binary search upper limit */
|
|
int low; /* binary search lower limit */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
erp_idx = 0;
|
|
low = 0;
|
|
high = nlists - 1;
|
|
while (low <= high) {
|
|
erp_idx = (low + high) >> 1;
|
|
erp = &ifp->if_u1.if_ext_irec[erp_idx];
|
|
erp_next = erp_idx < nlists - 1 ? erp + 1 : NULL;
|
|
if (bno < xfs_bmbt_get_startoff(erp->er_extbuf)) {
|
|
high = erp_idx - 1;
|
|
} else if (erp_next && bno >=
|
|
xfs_bmbt_get_startoff(erp_next->er_extbuf)) {
|
|
low = erp_idx + 1;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
*erp_idxp = erp_idx;
|
|
return erp;
|
|
}
|
|
|
|
/*
|
|
* Return a pointer to the indirection array entry containing the
|
|
* extent record at file extent index *idxp. Store the index of the
|
|
* target irec in *erp_idxp and store the page index of the target
|
|
* extent record in *idxp.
|
|
*/
|
|
xfs_ext_irec_t *
|
|
xfs_iext_idx_to_irec(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
xfs_extnum_t *idxp, /* extent index (file -> page) */
|
|
int *erp_idxp, /* pointer to target irec */
|
|
int realloc) /* new bytes were just added */
|
|
{
|
|
xfs_ext_irec_t *prev; /* pointer to previous irec */
|
|
xfs_ext_irec_t *erp = NULL; /* pointer to current irec */
|
|
int erp_idx; /* indirection array index */
|
|
int nlists; /* number of irec's (ex lists) */
|
|
int high; /* binary search upper limit */
|
|
int low; /* binary search lower limit */
|
|
xfs_extnum_t page_idx = *idxp; /* extent index in target list */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
ASSERT(page_idx >= 0 && page_idx <=
|
|
ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
erp_idx = 0;
|
|
low = 0;
|
|
high = nlists - 1;
|
|
|
|
/* Binary search extent irec's */
|
|
while (low <= high) {
|
|
erp_idx = (low + high) >> 1;
|
|
erp = &ifp->if_u1.if_ext_irec[erp_idx];
|
|
prev = erp_idx > 0 ? erp - 1 : NULL;
|
|
if (page_idx < erp->er_extoff || (page_idx == erp->er_extoff &&
|
|
realloc && prev && prev->er_extcount < XFS_LINEAR_EXTS)) {
|
|
high = erp_idx - 1;
|
|
} else if (page_idx > erp->er_extoff + erp->er_extcount ||
|
|
(page_idx == erp->er_extoff + erp->er_extcount &&
|
|
!realloc)) {
|
|
low = erp_idx + 1;
|
|
} else if (page_idx == erp->er_extoff + erp->er_extcount &&
|
|
erp->er_extcount == XFS_LINEAR_EXTS) {
|
|
ASSERT(realloc);
|
|
page_idx = 0;
|
|
erp_idx++;
|
|
erp = erp_idx < nlists ? erp + 1 : NULL;
|
|
break;
|
|
} else {
|
|
page_idx -= erp->er_extoff;
|
|
break;
|
|
}
|
|
}
|
|
*idxp = page_idx;
|
|
*erp_idxp = erp_idx;
|
|
return(erp);
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize an indirection array once the space needed
|
|
* for incore extents increases above XFS_IEXT_BUFSZ.
|
|
*/
|
|
void
|
|
xfs_iext_irec_init(
|
|
xfs_ifork_t *ifp) /* inode fork pointer */
|
|
{
|
|
xfs_ext_irec_t *erp; /* indirection array pointer */
|
|
xfs_extnum_t nextents; /* number of extents in file */
|
|
|
|
ASSERT(!(ifp->if_flags & XFS_IFEXTIREC));
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
ASSERT(nextents <= XFS_LINEAR_EXTS);
|
|
|
|
erp = kmem_alloc(sizeof(xfs_ext_irec_t), KM_NOFS);
|
|
|
|
if (nextents == 0) {
|
|
ifp->if_u1.if_extents = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS);
|
|
} else if (!ifp->if_real_bytes) {
|
|
xfs_iext_inline_to_direct(ifp, XFS_IEXT_BUFSZ);
|
|
} else if (ifp->if_real_bytes < XFS_IEXT_BUFSZ) {
|
|
xfs_iext_realloc_direct(ifp, XFS_IEXT_BUFSZ);
|
|
}
|
|
erp->er_extbuf = ifp->if_u1.if_extents;
|
|
erp->er_extcount = nextents;
|
|
erp->er_extoff = 0;
|
|
|
|
ifp->if_flags |= XFS_IFEXTIREC;
|
|
ifp->if_real_bytes = XFS_IEXT_BUFSZ;
|
|
ifp->if_bytes = nextents * sizeof(xfs_bmbt_rec_t);
|
|
ifp->if_u1.if_ext_irec = erp;
|
|
|
|
return;
|
|
}
|
|
|
|
/*
|
|
* Allocate and initialize a new entry in the indirection array.
|
|
*/
|
|
xfs_ext_irec_t *
|
|
xfs_iext_irec_new(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
int erp_idx) /* index for new irec */
|
|
{
|
|
xfs_ext_irec_t *erp; /* indirection array pointer */
|
|
int i; /* loop counter */
|
|
int nlists; /* number of irec's (ex lists) */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
|
|
/* Resize indirection array */
|
|
xfs_iext_realloc_indirect(ifp, ++nlists *
|
|
sizeof(xfs_ext_irec_t));
|
|
/*
|
|
* Move records down in the array so the
|
|
* new page can use erp_idx.
|
|
*/
|
|
erp = ifp->if_u1.if_ext_irec;
|
|
for (i = nlists - 1; i > erp_idx; i--) {
|
|
memmove(&erp[i], &erp[i-1], sizeof(xfs_ext_irec_t));
|
|
}
|
|
ASSERT(i == erp_idx);
|
|
|
|
/* Initialize new extent record */
|
|
erp = ifp->if_u1.if_ext_irec;
|
|
erp[erp_idx].er_extbuf = kmem_alloc(XFS_IEXT_BUFSZ, KM_NOFS);
|
|
ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
|
|
memset(erp[erp_idx].er_extbuf, 0, XFS_IEXT_BUFSZ);
|
|
erp[erp_idx].er_extcount = 0;
|
|
erp[erp_idx].er_extoff = erp_idx > 0 ?
|
|
erp[erp_idx-1].er_extoff + erp[erp_idx-1].er_extcount : 0;
|
|
return (&erp[erp_idx]);
|
|
}
|
|
|
|
/*
|
|
* Remove a record from the indirection array.
|
|
*/
|
|
void
|
|
xfs_iext_irec_remove(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
int erp_idx) /* irec index to remove */
|
|
{
|
|
xfs_ext_irec_t *erp; /* indirection array pointer */
|
|
int i; /* loop counter */
|
|
int nlists; /* number of irec's (ex lists) */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
erp = &ifp->if_u1.if_ext_irec[erp_idx];
|
|
if (erp->er_extbuf) {
|
|
xfs_iext_irec_update_extoffs(ifp, erp_idx + 1,
|
|
-erp->er_extcount);
|
|
kmem_free(erp->er_extbuf);
|
|
}
|
|
/* Compact extent records */
|
|
erp = ifp->if_u1.if_ext_irec;
|
|
for (i = erp_idx; i < nlists - 1; i++) {
|
|
memmove(&erp[i], &erp[i+1], sizeof(xfs_ext_irec_t));
|
|
}
|
|
/*
|
|
* Manually free the last extent record from the indirection
|
|
* array. A call to xfs_iext_realloc_indirect() with a size
|
|
* of zero would result in a call to xfs_iext_destroy() which
|
|
* would in turn call this function again, creating a nasty
|
|
* infinite loop.
|
|
*/
|
|
if (--nlists) {
|
|
xfs_iext_realloc_indirect(ifp,
|
|
nlists * sizeof(xfs_ext_irec_t));
|
|
} else {
|
|
kmem_free(ifp->if_u1.if_ext_irec);
|
|
}
|
|
ifp->if_real_bytes = nlists * XFS_IEXT_BUFSZ;
|
|
}
|
|
|
|
/*
|
|
* This is called to clean up large amounts of unused memory allocated
|
|
* by the indirection array. Before compacting anything though, verify
|
|
* that the indirection array is still needed and switch back to the
|
|
* linear extent list (or even the inline buffer) if possible. The
|
|
* compaction policy is as follows:
|
|
*
|
|
* Full Compaction: Extents fit into a single page (or inline buffer)
|
|
* Partial Compaction: Extents occupy less than 50% of allocated space
|
|
* No Compaction: Extents occupy at least 50% of allocated space
|
|
*/
|
|
void
|
|
xfs_iext_irec_compact(
|
|
xfs_ifork_t *ifp) /* inode fork pointer */
|
|
{
|
|
xfs_extnum_t nextents; /* number of extents in file */
|
|
int nlists; /* number of irec's (ex lists) */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
|
|
|
|
if (nextents == 0) {
|
|
xfs_iext_destroy(ifp);
|
|
} else if (nextents <= XFS_INLINE_EXTS) {
|
|
xfs_iext_indirect_to_direct(ifp);
|
|
xfs_iext_direct_to_inline(ifp, nextents);
|
|
} else if (nextents <= XFS_LINEAR_EXTS) {
|
|
xfs_iext_indirect_to_direct(ifp);
|
|
} else if (nextents < (nlists * XFS_LINEAR_EXTS) >> 1) {
|
|
xfs_iext_irec_compact_pages(ifp);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Combine extents from neighboring extent pages.
|
|
*/
|
|
void
|
|
xfs_iext_irec_compact_pages(
|
|
xfs_ifork_t *ifp) /* inode fork pointer */
|
|
{
|
|
xfs_ext_irec_t *erp, *erp_next;/* pointers to irec entries */
|
|
int erp_idx = 0; /* indirection array index */
|
|
int nlists; /* number of irec's (ex lists) */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
while (erp_idx < nlists - 1) {
|
|
erp = &ifp->if_u1.if_ext_irec[erp_idx];
|
|
erp_next = erp + 1;
|
|
if (erp_next->er_extcount <=
|
|
(XFS_LINEAR_EXTS - erp->er_extcount)) {
|
|
memcpy(&erp->er_extbuf[erp->er_extcount],
|
|
erp_next->er_extbuf, erp_next->er_extcount *
|
|
sizeof(xfs_bmbt_rec_t));
|
|
erp->er_extcount += erp_next->er_extcount;
|
|
/*
|
|
* Free page before removing extent record
|
|
* so er_extoffs don't get modified in
|
|
* xfs_iext_irec_remove.
|
|
*/
|
|
kmem_free(erp_next->er_extbuf);
|
|
erp_next->er_extbuf = NULL;
|
|
xfs_iext_irec_remove(ifp, erp_idx + 1);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
} else {
|
|
erp_idx++;
|
|
}
|
|
}
|
|
}
|
|
|
|
/*
|
|
* This is called to update the er_extoff field in the indirection
|
|
* array when extents have been added or removed from one of the
|
|
* extent lists. erp_idx contains the irec index to begin updating
|
|
* at and ext_diff contains the number of extents that were added
|
|
* or removed.
|
|
*/
|
|
void
|
|
xfs_iext_irec_update_extoffs(
|
|
xfs_ifork_t *ifp, /* inode fork pointer */
|
|
int erp_idx, /* irec index to update */
|
|
int ext_diff) /* number of new extents */
|
|
{
|
|
int i; /* loop counter */
|
|
int nlists; /* number of irec's (ex lists */
|
|
|
|
ASSERT(ifp->if_flags & XFS_IFEXTIREC);
|
|
nlists = ifp->if_real_bytes / XFS_IEXT_BUFSZ;
|
|
for (i = erp_idx; i < nlists; i++) {
|
|
ifp->if_u1.if_ext_irec[i].er_extoff += ext_diff;
|
|
}
|
|
}
|