mirror of https://gitee.com/openkylin/linux.git
xfs: create simplified inode walk function
Create a new iterator function to simplify walking inodes in an XFS filesystem. This new iterator will replace the existing open-coded walking that goes on in various places. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong
parent
5bb46e3e18
commit
a211432c27
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@ -81,6 +81,7 @@ xfs-y += xfs_aops.o \
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xfs_iops.o \
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xfs_inode.o \
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xfs_itable.o \
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xfs_iwalk.o \
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xfs_message.o \
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xfs_mount.o \
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xfs_mru_cache.o \
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@ -562,6 +562,36 @@ xfs_inobt_max_size(
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XFS_INODES_PER_CHUNK);
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}
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/* Read AGI and create inobt cursor. */
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int
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xfs_inobt_cur(
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struct xfs_mount *mp,
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struct xfs_trans *tp,
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xfs_agnumber_t agno,
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xfs_btnum_t which,
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struct xfs_btree_cur **curpp,
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struct xfs_buf **agi_bpp)
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{
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struct xfs_btree_cur *cur;
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int error;
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ASSERT(*agi_bpp == NULL);
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ASSERT(*curpp == NULL);
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error = xfs_ialloc_read_agi(mp, tp, agno, agi_bpp);
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if (error)
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return error;
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cur = xfs_inobt_init_cursor(mp, tp, *agi_bpp, agno, which);
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if (!cur) {
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xfs_trans_brelse(tp, *agi_bpp);
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*agi_bpp = NULL;
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return -ENOMEM;
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}
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*curpp = cur;
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return 0;
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}
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static int
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xfs_inobt_count_blocks(
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struct xfs_mount *mp,
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@ -570,15 +600,14 @@ xfs_inobt_count_blocks(
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xfs_btnum_t btnum,
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xfs_extlen_t *tree_blocks)
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{
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struct xfs_buf *agbp;
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struct xfs_btree_cur *cur;
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struct xfs_buf *agbp = NULL;
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struct xfs_btree_cur *cur = NULL;
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int error;
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error = xfs_ialloc_read_agi(mp, tp, agno, &agbp);
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error = xfs_inobt_cur(mp, tp, agno, btnum, &cur, &agbp);
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if (error)
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return error;
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cur = xfs_inobt_init_cursor(mp, tp, agbp, agno, btnum);
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error = xfs_btree_count_blocks(cur, tree_blocks);
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xfs_btree_del_cursor(cur, error);
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xfs_trans_brelse(tp, agbp);
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@ -64,5 +64,8 @@ int xfs_finobt_calc_reserves(struct xfs_mount *mp, struct xfs_trans *tp,
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xfs_agnumber_t agno, xfs_extlen_t *ask, xfs_extlen_t *used);
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extern xfs_extlen_t xfs_iallocbt_calc_size(struct xfs_mount *mp,
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unsigned long long len);
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int xfs_inobt_cur(struct xfs_mount *mp, struct xfs_trans *tp,
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xfs_agnumber_t agno, xfs_btnum_t btnum,
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struct xfs_btree_cur **curpp, struct xfs_buf **agi_bpp);
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#endif /* __XFS_IALLOC_BTREE_H__ */
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@ -18,6 +18,7 @@
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#include "xfs_error.h"
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#include "xfs_icache.h"
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#include "xfs_health.h"
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#include "xfs_iwalk.h"
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/*
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* Return stat information for one inode.
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@ -160,7 +161,7 @@ xfs_bulkstat_one(
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* Loop over all clusters in a chunk for a given incore inode allocation btree
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* record. Do a readahead if there are any allocated inodes in that cluster.
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*/
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STATIC void
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void
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xfs_bulkstat_ichunk_ra(
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struct xfs_mount *mp,
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xfs_agnumber_t agno,
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@ -194,7 +195,7 @@ xfs_bulkstat_ichunk_ra(
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* are some left allocated, update the data for the pointed-to record as well as
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* return the count of grabbed inodes.
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*/
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STATIC int
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int
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xfs_bulkstat_grab_ichunk(
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struct xfs_btree_cur *cur, /* btree cursor */
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xfs_agino_t agino, /* starting inode of chunk */
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@ -84,4 +84,12 @@ xfs_inumbers(
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void __user *buffer, /* buffer with inode info */
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inumbers_fmt_pf formatter);
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/* Temporarily needed while we refactor functions. */
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struct xfs_btree_cur;
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struct xfs_inobt_rec_incore;
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void xfs_bulkstat_ichunk_ra(struct xfs_mount *mp, xfs_agnumber_t agno,
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struct xfs_inobt_rec_incore *irec);
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int xfs_bulkstat_grab_ichunk(struct xfs_btree_cur *cur, xfs_agino_t agino,
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int *icount, struct xfs_inobt_rec_incore *irec);
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#endif /* __XFS_ITABLE_H__ */
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@ -0,0 +1,389 @@
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// SPDX-License-Identifier: GPL-2.0-or-later
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/*
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* Copyright (C) 2019 Oracle. All Rights Reserved.
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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_shared.h"
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#include "xfs_format.h"
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#include "xfs_log_format.h"
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#include "xfs_trans_resv.h"
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#include "xfs_mount.h"
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#include "xfs_inode.h"
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#include "xfs_btree.h"
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#include "xfs_ialloc.h"
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#include "xfs_ialloc_btree.h"
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#include "xfs_iwalk.h"
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#include "xfs_itable.h"
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#include "xfs_error.h"
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#include "xfs_trace.h"
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#include "xfs_icache.h"
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#include "xfs_health.h"
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#include "xfs_trans.h"
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/*
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* Walking Inodes in the Filesystem
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* ================================
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*
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* This iterator function walks a subset of filesystem inodes in increasing
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* order from @startino until there are no more inodes. For each allocated
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* inode it finds, it calls a walk function with the relevant inode number and
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* a pointer to caller-provided data. The walk function can return the usual
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* negative error code to stop the iteration; 0 to continue the iteration; or
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* XFS_IWALK_ABORT to stop the iteration. This return value is returned to the
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* caller.
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*
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* Internally, we allow the walk function to do anything, which means that we
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* cannot maintain the inobt cursor or our lock on the AGI buffer. We
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* therefore cache the inobt records in kernel memory and only call the walk
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* function when our memory buffer is full. @nr_recs is the number of records
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* that we've cached, and @sz_recs is the size of our cache.
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*
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* It is the responsibility of the walk function to ensure it accesses
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* allocated inodes, as the inobt records may be stale by the time they are
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* acted upon.
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*/
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struct xfs_iwalk_ag {
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struct xfs_mount *mp;
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struct xfs_trans *tp;
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/* Where do we start the traversal? */
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xfs_ino_t startino;
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/* Array of inobt records we cache. */
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struct xfs_inobt_rec_incore *recs;
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/* Number of entries allocated for the @recs array. */
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unsigned int sz_recs;
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/* Number of entries in the @recs array that are in use. */
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unsigned int nr_recs;
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/* Inode walk function and data pointer. */
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xfs_iwalk_fn iwalk_fn;
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void *data;
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};
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/* Allocate memory for a walk. */
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STATIC int
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xfs_iwalk_alloc(
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struct xfs_iwalk_ag *iwag)
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{
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size_t size;
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ASSERT(iwag->recs == NULL);
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iwag->nr_recs = 0;
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/* Allocate a prefetch buffer for inobt records. */
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size = iwag->sz_recs * sizeof(struct xfs_inobt_rec_incore);
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iwag->recs = kmem_alloc(size, KM_MAYFAIL);
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if (iwag->recs == NULL)
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return -ENOMEM;
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return 0;
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}
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/* Free memory we allocated for a walk. */
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STATIC void
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xfs_iwalk_free(
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struct xfs_iwalk_ag *iwag)
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{
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kmem_free(iwag->recs);
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iwag->recs = NULL;
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}
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/* For each inuse inode in each cached inobt record, call our function. */
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STATIC int
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xfs_iwalk_ag_recs(
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struct xfs_iwalk_ag *iwag)
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{
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struct xfs_mount *mp = iwag->mp;
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struct xfs_trans *tp = iwag->tp;
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xfs_ino_t ino;
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unsigned int i, j;
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xfs_agnumber_t agno;
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int error;
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agno = XFS_INO_TO_AGNO(mp, iwag->startino);
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for (i = 0; i < iwag->nr_recs; i++) {
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struct xfs_inobt_rec_incore *irec = &iwag->recs[i];
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trace_xfs_iwalk_ag_rec(mp, agno, irec);
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for (j = 0; j < XFS_INODES_PER_CHUNK; j++) {
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/* Skip if this inode is free */
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if (XFS_INOBT_MASK(j) & irec->ir_free)
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continue;
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/* Otherwise call our function. */
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ino = XFS_AGINO_TO_INO(mp, agno, irec->ir_startino + j);
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error = iwag->iwalk_fn(mp, tp, ino, iwag->data);
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if (error)
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return error;
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}
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}
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return 0;
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}
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/* Delete cursor and let go of AGI. */
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static inline void
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xfs_iwalk_del_inobt(
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struct xfs_trans *tp,
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struct xfs_btree_cur **curpp,
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struct xfs_buf **agi_bpp,
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int error)
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{
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if (*curpp) {
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xfs_btree_del_cursor(*curpp, error);
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*curpp = NULL;
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}
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if (*agi_bpp) {
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xfs_trans_brelse(tp, *agi_bpp);
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*agi_bpp = NULL;
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}
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}
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/*
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* Set ourselves up for walking inobt records starting from a given point in
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* the filesystem.
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*
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* If caller passed in a nonzero start inode number, load the record from the
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* inobt and make the record look like all the inodes before agino are free so
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* that we skip them, and then move the cursor to the next inobt record. This
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* is how we support starting an iwalk in the middle of an inode chunk.
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*
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* If the caller passed in a start number of zero, move the cursor to the first
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* inobt record.
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*
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* The caller is responsible for cleaning up the cursor and buffer pointer
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* regardless of the error status.
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*/
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STATIC int
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xfs_iwalk_ag_start(
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struct xfs_iwalk_ag *iwag,
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xfs_agnumber_t agno,
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xfs_agino_t agino,
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struct xfs_btree_cur **curpp,
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struct xfs_buf **agi_bpp,
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int *has_more)
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{
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struct xfs_mount *mp = iwag->mp;
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struct xfs_trans *tp = iwag->tp;
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int icount;
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int error;
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/* Set up a fresh cursor and empty the inobt cache. */
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iwag->nr_recs = 0;
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error = xfs_inobt_cur(mp, tp, agno, XFS_BTNUM_INO, curpp, agi_bpp);
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if (error)
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return error;
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/* Starting at the beginning of the AG? That's easy! */
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if (agino == 0)
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return xfs_inobt_lookup(*curpp, 0, XFS_LOOKUP_GE, has_more);
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/*
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* Otherwise, we have to grab the inobt record where we left off, stuff
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* the record into our cache, and then see if there are more records.
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* We require a lookup cache of at least two elements so that we don't
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* have to deal with tearing down the cursor to walk the records.
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*/
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error = xfs_bulkstat_grab_ichunk(*curpp, agino - 1, &icount,
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&iwag->recs[iwag->nr_recs]);
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if (error)
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return error;
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if (icount)
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iwag->nr_recs++;
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/*
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* The prefetch calculation is supposed to give us a large enough inobt
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* record cache that grab_ichunk can stage a partial first record and
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* the loop body can cache a record without having to check for cache
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* space until after it reads an inobt record.
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*/
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ASSERT(iwag->nr_recs < iwag->sz_recs);
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return xfs_btree_increment(*curpp, 0, has_more);
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}
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/*
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* The inobt record cache is full, so preserve the inobt cursor state and
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* run callbacks on the cached inobt records. When we're done, restore the
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* cursor state to wherever the cursor would have been had the cache not been
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* full (and therefore we could've just incremented the cursor) if *@has_more
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* is true. On exit, *@has_more will indicate whether or not the caller should
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* try for more inode records.
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*/
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STATIC int
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xfs_iwalk_run_callbacks(
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struct xfs_iwalk_ag *iwag,
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xfs_agnumber_t agno,
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struct xfs_btree_cur **curpp,
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struct xfs_buf **agi_bpp,
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int *has_more)
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{
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struct xfs_mount *mp = iwag->mp;
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struct xfs_trans *tp = iwag->tp;
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struct xfs_inobt_rec_incore *irec;
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xfs_agino_t restart;
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int error;
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ASSERT(iwag->nr_recs > 0);
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/* Delete cursor but remember the last record we cached... */
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xfs_iwalk_del_inobt(tp, curpp, agi_bpp, 0);
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irec = &iwag->recs[iwag->nr_recs - 1];
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restart = irec->ir_startino + XFS_INODES_PER_CHUNK - 1;
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error = xfs_iwalk_ag_recs(iwag);
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if (error)
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return error;
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/* ...empty the cache... */
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iwag->nr_recs = 0;
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if (!has_more)
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return 0;
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/* ...and recreate the cursor just past where we left off. */
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error = xfs_inobt_cur(mp, tp, agno, XFS_BTNUM_INO, curpp, agi_bpp);
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if (error)
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return error;
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return xfs_inobt_lookup(*curpp, restart, XFS_LOOKUP_GE, has_more);
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}
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/* Walk all inodes in a single AG, from @iwag->startino to the end of the AG. */
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STATIC int
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xfs_iwalk_ag(
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struct xfs_iwalk_ag *iwag)
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{
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struct xfs_mount *mp = iwag->mp;
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struct xfs_trans *tp = iwag->tp;
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struct xfs_buf *agi_bp = NULL;
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struct xfs_btree_cur *cur = NULL;
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xfs_agnumber_t agno;
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xfs_agino_t agino;
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int has_more;
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int error = 0;
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/* Set up our cursor at the right place in the inode btree. */
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agno = XFS_INO_TO_AGNO(mp, iwag->startino);
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agino = XFS_INO_TO_AGINO(mp, iwag->startino);
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error = xfs_iwalk_ag_start(iwag, agno, agino, &cur, &agi_bp, &has_more);
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while (!error && has_more) {
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struct xfs_inobt_rec_incore *irec;
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cond_resched();
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/* Fetch the inobt record. */
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irec = &iwag->recs[iwag->nr_recs];
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error = xfs_inobt_get_rec(cur, irec, &has_more);
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if (error || !has_more)
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break;
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/* No allocated inodes in this chunk; skip it. */
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if (irec->ir_freecount == irec->ir_count) {
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error = xfs_btree_increment(cur, 0, &has_more);
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if (error)
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break;
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continue;
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}
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/*
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* Start readahead for this inode chunk in anticipation of
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* walking the inodes.
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*/
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xfs_bulkstat_ichunk_ra(mp, agno, irec);
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/*
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* If there's space in the buffer for more records, increment
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* the btree cursor and grab more.
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*/
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if (++iwag->nr_recs < iwag->sz_recs) {
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error = xfs_btree_increment(cur, 0, &has_more);
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if (error || !has_more)
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break;
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continue;
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}
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/*
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* Otherwise, we need to save cursor state and run the callback
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* function on the cached records. The run_callbacks function
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* is supposed to return a cursor pointing to the record where
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* we would be if we had been able to increment like above.
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*/
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ASSERT(has_more);
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error = xfs_iwalk_run_callbacks(iwag, agno, &cur, &agi_bp,
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&has_more);
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}
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if (iwag->nr_recs == 0 || error)
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goto out;
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||||
|
||||
/* Walk the unprocessed records in the cache. */
|
||||
error = xfs_iwalk_run_callbacks(iwag, agno, &cur, &agi_bp, &has_more);
|
||||
|
||||
out:
|
||||
xfs_iwalk_del_inobt(tp, &cur, &agi_bp, error);
|
||||
return error;
|
||||
}
|
||||
|
||||
/*
|
||||
* Given the number of inodes to prefetch, set the number of inobt records that
|
||||
* we cache in memory, which controls the number of inodes we try to read
|
||||
* ahead.
|
||||
*/
|
||||
static inline unsigned int
|
||||
xfs_iwalk_prefetch(
|
||||
unsigned int inode_records)
|
||||
{
|
||||
return PAGE_SIZE * 4 / sizeof(struct xfs_inobt_rec_incore);
|
||||
}
|
||||
|
||||
/*
|
||||
* Walk all inodes in the filesystem starting from @startino. The @iwalk_fn
|
||||
* will be called for each allocated inode, being passed the inode's number and
|
||||
* @data. @max_prefetch controls how many inobt records' worth of inodes we
|
||||
* try to readahead.
|
||||
*/
|
||||
int
|
||||
xfs_iwalk(
|
||||
struct xfs_mount *mp,
|
||||
struct xfs_trans *tp,
|
||||
xfs_ino_t startino,
|
||||
xfs_iwalk_fn iwalk_fn,
|
||||
unsigned int inode_records,
|
||||
void *data)
|
||||
{
|
||||
struct xfs_iwalk_ag iwag = {
|
||||
.mp = mp,
|
||||
.tp = tp,
|
||||
.iwalk_fn = iwalk_fn,
|
||||
.data = data,
|
||||
.startino = startino,
|
||||
.sz_recs = xfs_iwalk_prefetch(inode_records),
|
||||
};
|
||||
xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, startino);
|
||||
int error;
|
||||
|
||||
ASSERT(agno < mp->m_sb.sb_agcount);
|
||||
|
||||
error = xfs_iwalk_alloc(&iwag);
|
||||
if (error)
|
||||
return error;
|
||||
|
||||
for (; agno < mp->m_sb.sb_agcount; agno++) {
|
||||
error = xfs_iwalk_ag(&iwag);
|
||||
if (error)
|
||||
break;
|
||||
iwag.startino = XFS_AGINO_TO_INO(mp, agno + 1, 0);
|
||||
}
|
||||
|
||||
xfs_iwalk_free(&iwag);
|
||||
return error;
|
||||
}
|
||||
|
|
@ -0,0 +1,19 @@
|
|||
/* SPDX-License-Identifier: GPL-2.0-or-later */
|
||||
/*
|
||||
* Copyright (C) 2019 Oracle. All Rights Reserved.
|
||||
* Author: Darrick J. Wong <darrick.wong@oracle.com>
|
||||
*/
|
||||
#ifndef __XFS_IWALK_H__
|
||||
#define __XFS_IWALK_H__
|
||||
|
||||
/* Walk all inodes in the filesystem starting from @startino. */
|
||||
typedef int (*xfs_iwalk_fn)(struct xfs_mount *mp, struct xfs_trans *tp,
|
||||
xfs_ino_t ino, void *data);
|
||||
/* Return values for xfs_iwalk_fn. */
|
||||
#define XFS_IWALK_CONTINUE (XFS_ITER_CONTINUE)
|
||||
#define XFS_IWALK_ABORT (XFS_ITER_ABORT)
|
||||
|
||||
int xfs_iwalk(struct xfs_mount *mp, struct xfs_trans *tp, xfs_ino_t startino,
|
||||
xfs_iwalk_fn iwalk_fn, unsigned int inode_records, void *data);
|
||||
|
||||
#endif /* __XFS_IWALK_H__ */
|
||||
|
|
@ -3517,6 +3517,46 @@ DEFINE_EVENT(xfs_inode_corrupt_class, name, \
|
|||
DEFINE_INODE_CORRUPT_EVENT(xfs_inode_mark_sick);
|
||||
DEFINE_INODE_CORRUPT_EVENT(xfs_inode_mark_healthy);
|
||||
|
||||
TRACE_EVENT(xfs_iwalk_ag,
|
||||
TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno,
|
||||
xfs_agino_t startino),
|
||||
TP_ARGS(mp, agno, startino),
|
||||
TP_STRUCT__entry(
|
||||
__field(dev_t, dev)
|
||||
__field(xfs_agnumber_t, agno)
|
||||
__field(xfs_agino_t, startino)
|
||||
),
|
||||
TP_fast_assign(
|
||||
__entry->dev = mp->m_super->s_dev;
|
||||
__entry->agno = agno;
|
||||
__entry->startino = startino;
|
||||
),
|
||||
TP_printk("dev %d:%d agno %d startino %u",
|
||||
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->agno,
|
||||
__entry->startino)
|
||||
)
|
||||
|
||||
TRACE_EVENT(xfs_iwalk_ag_rec,
|
||||
TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno,
|
||||
struct xfs_inobt_rec_incore *irec),
|
||||
TP_ARGS(mp, agno, irec),
|
||||
TP_STRUCT__entry(
|
||||
__field(dev_t, dev)
|
||||
__field(xfs_agnumber_t, agno)
|
||||
__field(xfs_agino_t, startino)
|
||||
__field(uint64_t, freemask)
|
||||
),
|
||||
TP_fast_assign(
|
||||
__entry->dev = mp->m_super->s_dev;
|
||||
__entry->agno = agno;
|
||||
__entry->startino = irec->ir_startino;
|
||||
__entry->freemask = irec->ir_free;
|
||||
),
|
||||
TP_printk("dev %d:%d agno %d startino %u freemask 0x%llx",
|
||||
MAJOR(__entry->dev), MINOR(__entry->dev), __entry->agno,
|
||||
__entry->startino, __entry->freemask)
|
||||
)
|
||||
|
||||
#endif /* _TRACE_XFS_H */
|
||||
|
||||
#undef TRACE_INCLUDE_PATH
|
||||
|
|
|
|||
Loading…
Reference in New Issue