mirror of https://gitee.com/openkylin/linux.git
958 lines
24 KiB
C
958 lines
24 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 "xfs.h"
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#include "xfs_fs.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_sb.h"
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#include "xfs_ag.h"
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#include "xfs_dir2.h"
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#include "xfs_alloc.h"
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#include "xfs_dmapi.h"
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#include "xfs_quota.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_dir2_sf.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_ialloc.h"
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#include "xfs_btree.h"
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#include "xfs_bmap.h"
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#include "xfs_rtalloc.h"
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#include "xfs_error.h"
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#include "xfs_itable.h"
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#include "xfs_rw.h"
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#include "xfs_acl.h"
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#include "xfs_attr.h"
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#include "xfs_buf_item.h"
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#include "xfs_trans_space.h"
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#include "xfs_utils.h"
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#include "xfs_iomap.h"
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#if defined(XFS_RW_TRACE)
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void
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xfs_iomap_enter_trace(
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int tag,
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xfs_inode_t *ip,
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xfs_off_t offset,
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ssize_t count)
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{
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if (!ip->i_rwtrace)
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return;
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ktrace_enter(ip->i_rwtrace,
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(void *)((unsigned long)tag),
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(void *)ip,
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(void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
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(void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
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(void *)((unsigned long)((offset >> 32) & 0xffffffff)),
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(void *)((unsigned long)(offset & 0xffffffff)),
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(void *)((unsigned long)count),
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(void *)((unsigned long)((ip->i_new_size >> 32) & 0xffffffff)),
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(void *)((unsigned long)(ip->i_new_size & 0xffffffff)),
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(void *)((unsigned long)current_pid()),
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL,
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(void *)NULL);
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}
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void
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xfs_iomap_map_trace(
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int tag,
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xfs_inode_t *ip,
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xfs_off_t offset,
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ssize_t count,
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xfs_iomap_t *iomapp,
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xfs_bmbt_irec_t *imapp,
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int flags)
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{
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if (!ip->i_rwtrace)
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return;
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ktrace_enter(ip->i_rwtrace,
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(void *)((unsigned long)tag),
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(void *)ip,
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(void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
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(void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
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(void *)((unsigned long)((offset >> 32) & 0xffffffff)),
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(void *)((unsigned long)(offset & 0xffffffff)),
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(void *)((unsigned long)count),
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(void *)((unsigned long)flags),
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(void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
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(void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
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(void *)((unsigned long)(iomapp->iomap_delta)),
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(void *)((unsigned long)(iomapp->iomap_bsize)),
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(void *)((unsigned long)(iomapp->iomap_bn)),
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(void *)(__psint_t)(imapp->br_startoff),
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(void *)((unsigned long)(imapp->br_blockcount)),
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(void *)(__psint_t)(imapp->br_startblock));
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}
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#else
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#define xfs_iomap_enter_trace(tag, io, offset, count)
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#define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
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#endif
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#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
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<< mp->m_writeio_log)
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#define XFS_STRAT_WRITE_IMAPS 2
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#define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
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STATIC int
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xfs_imap_to_bmap(
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xfs_inode_t *ip,
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xfs_off_t offset,
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xfs_bmbt_irec_t *imap,
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xfs_iomap_t *iomapp,
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int imaps, /* Number of imap entries */
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int iomaps, /* Number of iomap entries */
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int flags)
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{
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xfs_mount_t *mp = ip->i_mount;
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int pbm;
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xfs_fsblock_t start_block;
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for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
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iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
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iomapp->iomap_delta = offset - iomapp->iomap_offset;
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iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
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iomapp->iomap_flags = flags;
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if (XFS_IS_REALTIME_INODE(ip)) {
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iomapp->iomap_flags |= IOMAP_REALTIME;
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iomapp->iomap_target = mp->m_rtdev_targp;
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} else {
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iomapp->iomap_target = mp->m_ddev_targp;
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}
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start_block = imap->br_startblock;
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if (start_block == HOLESTARTBLOCK) {
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iomapp->iomap_bn = IOMAP_DADDR_NULL;
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iomapp->iomap_flags |= IOMAP_HOLE;
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} else if (start_block == DELAYSTARTBLOCK) {
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iomapp->iomap_bn = IOMAP_DADDR_NULL;
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iomapp->iomap_flags |= IOMAP_DELAY;
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} else {
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iomapp->iomap_bn = XFS_FSB_TO_DB(ip, start_block);
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if (ISUNWRITTEN(imap))
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iomapp->iomap_flags |= IOMAP_UNWRITTEN;
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}
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offset += iomapp->iomap_bsize - iomapp->iomap_delta;
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}
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return pbm; /* Return the number filled */
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}
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int
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xfs_iomap(
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xfs_inode_t *ip,
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xfs_off_t offset,
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ssize_t count,
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int flags,
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xfs_iomap_t *iomapp,
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int *niomaps)
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{
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xfs_mount_t *mp = ip->i_mount;
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xfs_fileoff_t offset_fsb, end_fsb;
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int error = 0;
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int lockmode = 0;
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xfs_bmbt_irec_t imap;
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int nimaps = 1;
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int bmapi_flags = 0;
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int iomap_flags = 0;
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ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG);
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if (XFS_FORCED_SHUTDOWN(mp))
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return XFS_ERROR(EIO);
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switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE)) {
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case BMAPI_READ:
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xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, ip, offset, count);
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lockmode = xfs_ilock_map_shared(ip);
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bmapi_flags = XFS_BMAPI_ENTIRE;
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break;
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case BMAPI_WRITE:
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xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, ip, offset, count);
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lockmode = XFS_ILOCK_EXCL;
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if (flags & BMAPI_IGNSTATE)
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bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;
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xfs_ilock(ip, lockmode);
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break;
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case BMAPI_ALLOCATE:
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xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, ip, offset, count);
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lockmode = XFS_ILOCK_SHARED;
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bmapi_flags = XFS_BMAPI_ENTIRE;
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/* Attempt non-blocking lock */
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if (flags & BMAPI_TRYLOCK) {
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if (!xfs_ilock_nowait(ip, lockmode))
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return XFS_ERROR(EAGAIN);
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} else {
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xfs_ilock(ip, lockmode);
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}
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break;
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default:
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BUG();
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}
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ASSERT(offset <= mp->m_maxioffset);
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if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
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count = mp->m_maxioffset - offset;
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end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
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offset_fsb = XFS_B_TO_FSBT(mp, offset);
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error = xfs_bmapi(NULL, ip, offset_fsb,
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(xfs_filblks_t)(end_fsb - offset_fsb),
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bmapi_flags, NULL, 0, &imap,
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&nimaps, NULL, NULL);
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if (error)
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goto out;
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switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) {
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case BMAPI_WRITE:
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/* If we found an extent, return it */
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if (nimaps &&
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(imap.br_startblock != HOLESTARTBLOCK) &&
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(imap.br_startblock != DELAYSTARTBLOCK)) {
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xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, ip,
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offset, count, iomapp, &imap, flags);
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break;
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}
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if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
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error = xfs_iomap_write_direct(ip, offset, count, flags,
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&imap, &nimaps, nimaps);
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} else {
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error = xfs_iomap_write_delay(ip, offset, count, flags,
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&imap, &nimaps);
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}
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if (!error) {
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xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, ip,
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offset, count, iomapp, &imap, flags);
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}
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iomap_flags = IOMAP_NEW;
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break;
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case BMAPI_ALLOCATE:
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/* If we found an extent, return it */
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xfs_iunlock(ip, lockmode);
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lockmode = 0;
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if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
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xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, ip,
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offset, count, iomapp, &imap, flags);
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break;
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}
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error = xfs_iomap_write_allocate(ip, offset, count,
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&imap, &nimaps);
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break;
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}
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if (nimaps) {
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*niomaps = xfs_imap_to_bmap(ip, offset, &imap,
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iomapp, nimaps, *niomaps, iomap_flags);
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} else if (niomaps) {
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*niomaps = 0;
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}
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out:
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if (lockmode)
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xfs_iunlock(ip, lockmode);
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return XFS_ERROR(error);
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}
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STATIC int
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xfs_iomap_eof_align_last_fsb(
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xfs_mount_t *mp,
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xfs_inode_t *ip,
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xfs_fsize_t isize,
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xfs_extlen_t extsize,
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xfs_fileoff_t *last_fsb)
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{
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xfs_fileoff_t new_last_fsb = 0;
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xfs_extlen_t align;
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int eof, error;
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if (XFS_IS_REALTIME_INODE(ip))
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;
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/*
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* If mounted with the "-o swalloc" option, roundup the allocation
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* request to a stripe width boundary if the file size is >=
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* stripe width and we are allocating past the allocation eof.
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*/
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else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&
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(isize >= XFS_FSB_TO_B(mp, mp->m_swidth)))
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new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);
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/*
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* Roundup the allocation request to a stripe unit (m_dalign) boundary
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* if the file size is >= stripe unit size, and we are allocating past
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* the allocation eof.
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*/
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else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)))
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new_last_fsb = roundup_64(*last_fsb, mp->m_dalign);
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/*
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* Always round up the allocation request to an extent boundary
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* (when file on a real-time subvolume or has di_extsize hint).
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*/
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if (extsize) {
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if (new_last_fsb)
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align = roundup_64(new_last_fsb, extsize);
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else
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align = extsize;
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new_last_fsb = roundup_64(*last_fsb, align);
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}
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if (new_last_fsb) {
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error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
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if (error)
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return error;
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if (eof)
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*last_fsb = new_last_fsb;
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}
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return 0;
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}
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STATIC int
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xfs_flush_space(
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xfs_inode_t *ip,
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int *fsynced,
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int *ioflags)
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{
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switch (*fsynced) {
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case 0:
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if (ip->i_delayed_blks) {
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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xfs_flush_inode(ip);
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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*fsynced = 1;
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} else {
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*ioflags |= BMAPI_SYNC;
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*fsynced = 2;
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}
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return 0;
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case 1:
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*fsynced = 2;
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*ioflags |= BMAPI_SYNC;
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return 0;
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case 2:
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xfs_iunlock(ip, XFS_ILOCK_EXCL);
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xfs_flush_device(ip);
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xfs_ilock(ip, XFS_ILOCK_EXCL);
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*fsynced = 3;
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return 0;
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}
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return 1;
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}
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STATIC int
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xfs_cmn_err_fsblock_zero(
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xfs_inode_t *ip,
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xfs_bmbt_irec_t *imap)
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{
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xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
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"Access to block zero in inode %llu "
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"start_block: %llx start_off: %llx "
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"blkcnt: %llx extent-state: %x\n",
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(unsigned long long)ip->i_ino,
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(unsigned long long)imap->br_startblock,
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(unsigned long long)imap->br_startoff,
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(unsigned long long)imap->br_blockcount,
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imap->br_state);
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return EFSCORRUPTED;
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}
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int
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xfs_iomap_write_direct(
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xfs_inode_t *ip,
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xfs_off_t offset,
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size_t count,
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int flags,
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xfs_bmbt_irec_t *ret_imap,
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int *nmaps,
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int found)
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{
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xfs_mount_t *mp = ip->i_mount;
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xfs_fileoff_t offset_fsb;
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xfs_fileoff_t last_fsb;
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xfs_filblks_t count_fsb, resaligned;
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xfs_fsblock_t firstfsb;
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xfs_extlen_t extsz, temp;
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xfs_fsize_t isize;
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int nimaps;
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int bmapi_flag;
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int quota_flag;
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int rt;
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xfs_trans_t *tp;
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xfs_bmbt_irec_t imap;
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xfs_bmap_free_t free_list;
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uint qblocks, resblks, resrtextents;
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int committed;
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int error;
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/*
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* Make sure that the dquots are there. This doesn't hold
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* the ilock across a disk read.
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*/
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error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
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if (error)
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return XFS_ERROR(error);
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rt = XFS_IS_REALTIME_INODE(ip);
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extsz = xfs_get_extsz_hint(ip);
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isize = ip->i_size;
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if (ip->i_new_size > isize)
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isize = ip->i_new_size;
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offset_fsb = XFS_B_TO_FSBT(mp, offset);
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last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
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if ((offset + count) > isize) {
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error = xfs_iomap_eof_align_last_fsb(mp, ip, isize, extsz,
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&last_fsb);
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if (error)
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goto error_out;
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} else {
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if (found && (ret_imap->br_startblock == HOLESTARTBLOCK))
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last_fsb = MIN(last_fsb, (xfs_fileoff_t)
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ret_imap->br_blockcount +
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ret_imap->br_startoff);
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}
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count_fsb = last_fsb - offset_fsb;
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ASSERT(count_fsb > 0);
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resaligned = count_fsb;
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if (unlikely(extsz)) {
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if ((temp = do_mod(offset_fsb, extsz)))
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resaligned += temp;
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if ((temp = do_mod(resaligned, extsz)))
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resaligned += extsz - temp;
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}
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if (unlikely(rt)) {
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resrtextents = qblocks = resaligned;
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resrtextents /= mp->m_sb.sb_rextsize;
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resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
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quota_flag = XFS_QMOPT_RES_RTBLKS;
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} else {
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resrtextents = 0;
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resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
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quota_flag = XFS_QMOPT_RES_REGBLKS;
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}
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/*
|
|
* Allocate and setup the transaction
|
|
*/
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
|
|
error = xfs_trans_reserve(tp, resblks,
|
|
XFS_WRITE_LOG_RES(mp), resrtextents,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
/*
|
|
* Check for running out of space, note: need lock to return
|
|
*/
|
|
if (error)
|
|
xfs_trans_cancel(tp, 0);
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
if (error)
|
|
goto error_out;
|
|
|
|
error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
|
|
qblocks, 0, quota_flag);
|
|
if (error)
|
|
goto error1;
|
|
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ihold(tp, ip);
|
|
|
|
bmapi_flag = XFS_BMAPI_WRITE;
|
|
if ((flags & BMAPI_DIRECT) && (offset < ip->i_size || extsz))
|
|
bmapi_flag |= XFS_BMAPI_PREALLOC;
|
|
|
|
/*
|
|
* Issue the xfs_bmapi() call to allocate the blocks
|
|
*/
|
|
XFS_BMAP_INIT(&free_list, &firstfsb);
|
|
nimaps = 1;
|
|
error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, bmapi_flag,
|
|
&firstfsb, 0, &imap, &nimaps, &free_list, NULL);
|
|
if (error)
|
|
goto error0;
|
|
|
|
/*
|
|
* Complete the transaction
|
|
*/
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto error0;
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto error_out;
|
|
|
|
/*
|
|
* Copy any maps to caller's array and return any error.
|
|
*/
|
|
if (nimaps == 0) {
|
|
error = ENOSPC;
|
|
goto error_out;
|
|
}
|
|
|
|
if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) {
|
|
error = xfs_cmn_err_fsblock_zero(ip, &imap);
|
|
goto error_out;
|
|
}
|
|
|
|
*ret_imap = imap;
|
|
*nmaps = 1;
|
|
return 0;
|
|
|
|
error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
|
|
xfs_bmap_cancel(&free_list);
|
|
XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
|
|
|
|
error1: /* Just cancel transaction */
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
*nmaps = 0; /* nothing set-up here */
|
|
|
|
error_out:
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
/*
|
|
* If the caller is doing a write at the end of the file,
|
|
* then extend the allocation out to the file system's write
|
|
* iosize. We clean up any extra space left over when the
|
|
* file is closed in xfs_inactive().
|
|
*
|
|
* For sync writes, we are flushing delayed allocate space to
|
|
* try to make additional space available for allocation near
|
|
* the filesystem full boundary - preallocation hurts in that
|
|
* situation, of course.
|
|
*/
|
|
STATIC int
|
|
xfs_iomap_eof_want_preallocate(
|
|
xfs_mount_t *mp,
|
|
xfs_inode_t *ip,
|
|
xfs_fsize_t isize,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
int ioflag,
|
|
xfs_bmbt_irec_t *imap,
|
|
int nimaps,
|
|
int *prealloc)
|
|
{
|
|
xfs_fileoff_t start_fsb;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_fsblock_t firstblock;
|
|
int n, error, imaps;
|
|
|
|
*prealloc = 0;
|
|
if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize)
|
|
return 0;
|
|
|
|
/*
|
|
* If there are any real blocks past eof, then don't
|
|
* do any speculative allocation.
|
|
*/
|
|
start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
|
|
count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
|
|
while (count_fsb > 0) {
|
|
imaps = nimaps;
|
|
firstblock = NULLFSBLOCK;
|
|
error = xfs_bmapi(NULL, ip, start_fsb, count_fsb, 0,
|
|
&firstblock, 0, imap, &imaps, NULL, NULL);
|
|
if (error)
|
|
return error;
|
|
for (n = 0; n < imaps; n++) {
|
|
if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
|
|
(imap[n].br_startblock != DELAYSTARTBLOCK))
|
|
return 0;
|
|
start_fsb += imap[n].br_blockcount;
|
|
count_fsb -= imap[n].br_blockcount;
|
|
}
|
|
}
|
|
*prealloc = 1;
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
xfs_iomap_write_delay(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
int ioflag,
|
|
xfs_bmbt_irec_t *ret_imap,
|
|
int *nmaps)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_fileoff_t last_fsb;
|
|
xfs_off_t aligned_offset;
|
|
xfs_fileoff_t ioalign;
|
|
xfs_fsblock_t firstblock;
|
|
xfs_extlen_t extsz;
|
|
xfs_fsize_t isize;
|
|
int nimaps;
|
|
xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
|
|
int prealloc, fsynced = 0;
|
|
int error;
|
|
|
|
ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
|
|
|
|
/*
|
|
* Make sure that the dquots are there. This doesn't hold
|
|
* the ilock across a disk read.
|
|
*/
|
|
error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
|
|
if (error)
|
|
return XFS_ERROR(error);
|
|
|
|
extsz = xfs_get_extsz_hint(ip);
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
|
|
retry:
|
|
isize = ip->i_size;
|
|
if (ip->i_new_size > isize)
|
|
isize = ip->i_new_size;
|
|
|
|
error = xfs_iomap_eof_want_preallocate(mp, ip, isize, offset, count,
|
|
ioflag, imap, XFS_WRITE_IMAPS, &prealloc);
|
|
if (error)
|
|
return error;
|
|
|
|
if (prealloc) {
|
|
aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
|
|
ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
|
|
last_fsb = ioalign + mp->m_writeio_blocks;
|
|
} else {
|
|
last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
|
|
}
|
|
|
|
if (prealloc || extsz) {
|
|
error = xfs_iomap_eof_align_last_fsb(mp, ip, isize, extsz,
|
|
&last_fsb);
|
|
if (error)
|
|
return error;
|
|
}
|
|
|
|
nimaps = XFS_WRITE_IMAPS;
|
|
firstblock = NULLFSBLOCK;
|
|
error = xfs_bmapi(NULL, ip, offset_fsb,
|
|
(xfs_filblks_t)(last_fsb - offset_fsb),
|
|
XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
|
|
XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
|
|
&nimaps, NULL, NULL);
|
|
if (error && (error != ENOSPC))
|
|
return XFS_ERROR(error);
|
|
|
|
/*
|
|
* If bmapi returned us nothing, and if we didn't get back EDQUOT,
|
|
* then we must have run out of space - flush delalloc, and retry..
|
|
*/
|
|
if (nimaps == 0) {
|
|
xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
|
|
ip, offset, count);
|
|
if (xfs_flush_space(ip, &fsynced, &ioflag))
|
|
return XFS_ERROR(ENOSPC);
|
|
|
|
error = 0;
|
|
goto retry;
|
|
}
|
|
|
|
if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_cmn_err_fsblock_zero(ip, &imap[0]);
|
|
|
|
*ret_imap = imap[0];
|
|
*nmaps = 1;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Pass in a delayed allocate extent, convert it to real extents;
|
|
* return to the caller the extent we create which maps on top of
|
|
* the originating callers request.
|
|
*
|
|
* Called without a lock on the inode.
|
|
*
|
|
* We no longer bother to look at the incoming map - all we have to
|
|
* guarantee is that whatever we allocate fills the required range.
|
|
*/
|
|
int
|
|
xfs_iomap_write_allocate(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count,
|
|
xfs_bmbt_irec_t *map,
|
|
int *retmap)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb, last_block;
|
|
xfs_fileoff_t end_fsb, map_start_fsb;
|
|
xfs_fsblock_t first_block;
|
|
xfs_bmap_free_t free_list;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_bmbt_irec_t imap;
|
|
xfs_trans_t *tp;
|
|
int nimaps, committed;
|
|
int error = 0;
|
|
int nres;
|
|
|
|
*retmap = 0;
|
|
|
|
/*
|
|
* Make sure that the dquots are there.
|
|
*/
|
|
if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
|
|
return XFS_ERROR(error);
|
|
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
count_fsb = map->br_blockcount;
|
|
map_start_fsb = map->br_startoff;
|
|
|
|
XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
|
|
|
|
while (count_fsb != 0) {
|
|
/*
|
|
* Set up a transaction with which to allocate the
|
|
* backing store for the file. Do allocations in a
|
|
* loop until we get some space in the range we are
|
|
* interested in. The other space that might be allocated
|
|
* is in the delayed allocation extent on which we sit
|
|
* but before our buffer starts.
|
|
*/
|
|
|
|
nimaps = 0;
|
|
while (nimaps == 0) {
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
|
|
tp->t_flags |= XFS_TRANS_RESERVE;
|
|
nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
|
|
error = xfs_trans_reserve(tp, nres,
|
|
XFS_WRITE_LOG_RES(mp),
|
|
0, XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return XFS_ERROR(error);
|
|
}
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ihold(tp, ip);
|
|
|
|
XFS_BMAP_INIT(&free_list, &first_block);
|
|
|
|
/*
|
|
* it is possible that the extents have changed since
|
|
* we did the read call as we dropped the ilock for a
|
|
* while. We have to be careful about truncates or hole
|
|
* punchs here - we are not allowed to allocate
|
|
* non-delalloc blocks here.
|
|
*
|
|
* The only protection against truncation is the pages
|
|
* for the range we are being asked to convert are
|
|
* locked and hence a truncate will block on them
|
|
* first.
|
|
*
|
|
* As a result, if we go beyond the range we really
|
|
* need and hit an delalloc extent boundary followed by
|
|
* a hole while we have excess blocks in the map, we
|
|
* will fill the hole incorrectly and overrun the
|
|
* transaction reservation.
|
|
*
|
|
* Using a single map prevents this as we are forced to
|
|
* check each map we look for overlap with the desired
|
|
* range and abort as soon as we find it. Also, given
|
|
* that we only return a single map, having one beyond
|
|
* what we can return is probably a bit silly.
|
|
*
|
|
* We also need to check that we don't go beyond EOF;
|
|
* this is a truncate optimisation as a truncate sets
|
|
* the new file size before block on the pages we
|
|
* currently have locked under writeback. Because they
|
|
* are about to be tossed, we don't need to write them
|
|
* back....
|
|
*/
|
|
nimaps = 1;
|
|
end_fsb = XFS_B_TO_FSB(mp, ip->i_size);
|
|
error = xfs_bmap_last_offset(NULL, ip, &last_block,
|
|
XFS_DATA_FORK);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
|
|
if ((map_start_fsb + count_fsb) > last_block) {
|
|
count_fsb = last_block - map_start_fsb;
|
|
if (count_fsb == 0) {
|
|
error = EAGAIN;
|
|
goto trans_cancel;
|
|
}
|
|
}
|
|
|
|
/* Go get the actual blocks */
|
|
error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
|
|
XFS_BMAPI_WRITE, &first_block, 1,
|
|
&imap, &nimaps, &free_list, NULL);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
error = xfs_bmap_finish(&tp, &free_list, &committed);
|
|
if (error)
|
|
goto trans_cancel;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
if (error)
|
|
goto error0;
|
|
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
}
|
|
|
|
/*
|
|
* See if we were able to allocate an extent that
|
|
* covers at least part of the callers request
|
|
*/
|
|
if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_cmn_err_fsblock_zero(ip, &imap);
|
|
|
|
if ((offset_fsb >= imap.br_startoff) &&
|
|
(offset_fsb < (imap.br_startoff +
|
|
imap.br_blockcount))) {
|
|
*map = imap;
|
|
*retmap = 1;
|
|
XFS_STATS_INC(xs_xstrat_quick);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* So far we have not mapped the requested part of the
|
|
* file, just surrounding data, try again.
|
|
*/
|
|
count_fsb -= imap.br_blockcount;
|
|
map_start_fsb = imap.br_startoff + imap.br_blockcount;
|
|
}
|
|
|
|
trans_cancel:
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
|
|
error0:
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
int
|
|
xfs_iomap_write_unwritten(
|
|
xfs_inode_t *ip,
|
|
xfs_off_t offset,
|
|
size_t count)
|
|
{
|
|
xfs_mount_t *mp = ip->i_mount;
|
|
xfs_fileoff_t offset_fsb;
|
|
xfs_filblks_t count_fsb;
|
|
xfs_filblks_t numblks_fsb;
|
|
xfs_fsblock_t firstfsb;
|
|
int nimaps;
|
|
xfs_trans_t *tp;
|
|
xfs_bmbt_irec_t imap;
|
|
xfs_bmap_free_t free_list;
|
|
uint resblks;
|
|
int committed;
|
|
int error;
|
|
|
|
xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, ip, offset, count);
|
|
|
|
offset_fsb = XFS_B_TO_FSBT(mp, offset);
|
|
count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
|
|
count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
|
|
|
|
resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
|
|
|
|
do {
|
|
/*
|
|
* set up a transaction to convert the range of extents
|
|
* from unwritten to real. Do allocations in a loop until
|
|
* we have covered the range passed in.
|
|
*/
|
|
tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
|
|
tp->t_flags |= XFS_TRANS_RESERVE;
|
|
error = xfs_trans_reserve(tp, resblks,
|
|
XFS_WRITE_LOG_RES(mp), 0,
|
|
XFS_TRANS_PERM_LOG_RES,
|
|
XFS_WRITE_LOG_COUNT);
|
|
if (error) {
|
|
xfs_trans_cancel(tp, 0);
|
|
return XFS_ERROR(error);
|
|
}
|
|
|
|
xfs_ilock(ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
|
|
xfs_trans_ihold(tp, ip);
|
|
|
|
/*
|
|
* Modify the unwritten extent state of the buffer.
|
|
*/
|
|
XFS_BMAP_INIT(&free_list, &firstfsb);
|
|
nimaps = 1;
|
|
error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
|
|
XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb,
|
|
1, &imap, &nimaps, &free_list, NULL);
|
|
if (error)
|
|
goto error_on_bmapi_transaction;
|
|
|
|
error = xfs_bmap_finish(&(tp), &(free_list), &committed);
|
|
if (error)
|
|
goto error_on_bmapi_transaction;
|
|
|
|
error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
if (error)
|
|
return XFS_ERROR(error);
|
|
|
|
if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
|
|
return xfs_cmn_err_fsblock_zero(ip, &imap);
|
|
|
|
if ((numblks_fsb = imap.br_blockcount) == 0) {
|
|
/*
|
|
* The numblks_fsb value should always get
|
|
* smaller, otherwise the loop is stuck.
|
|
*/
|
|
ASSERT(imap.br_blockcount);
|
|
break;
|
|
}
|
|
offset_fsb += numblks_fsb;
|
|
count_fsb -= numblks_fsb;
|
|
} while (count_fsb > 0);
|
|
|
|
return 0;
|
|
|
|
error_on_bmapi_transaction:
|
|
xfs_bmap_cancel(&free_list);
|
|
xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
|
|
xfs_iunlock(ip, XFS_ILOCK_EXCL);
|
|
return XFS_ERROR(error);
|
|
}
|