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ocfs2: only take lock if dio entry when recover orphans

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We have no need to take inode mutex, rw and inode lock if it is not dio
entry when recover orphans.  Optimize it by adding a flag
OCFS2_INODE_DIO_ORPHAN_ENTRY to ocfs2_inode_info to reduce contention.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Mark Fasheh <mfasheh@suse.de>
Cc: Joel Becker <jlbec@evilplan.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joseph Qi 2015-11-05 18:44:04 -08:00 committed by Linus Torvalds
parent 30edc43c7f
commit 93d911fcce
2 changed files with 49 additions and 39 deletions
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2
fs/ocfs2/inode.h
View File

@ -112,6 +112,8 @@ struct ocfs2_inode_info
#define OCFS2_INODE_OPEN_DIRECT 0x00000020
/* Tell the inode wipe code it's not in orphan dir */
#define OCFS2_INODE_SKIP_ORPHAN_DIR 0x00000040
/* Entry in orphan dir with 'dio-' prefix */
#define OCFS2_INODE_DIO_ORPHAN_ENTRY 0x00000080
static inline struct ocfs2_inode_info *OCFS2_I(struct inode *inode)
{

86
fs/ocfs2/journal.c
View File

@ -2049,6 +2049,10 @@ static int ocfs2_orphan_filldir(struct dir_context *ctx, const char *name,
if (IS_ERR(iter))
return 0;
if (!strncmp(name, OCFS2_DIO_ORPHAN_PREFIX,
OCFS2_DIO_ORPHAN_PREFIX_LEN))
OCFS2_I(iter)->ip_flags |= OCFS2_INODE_DIO_ORPHAN_ENTRY;
/* Skip inodes which are already added to recover list, since dio may
* happen concurrently with unlink/rename */
if (OCFS2_I(iter)->ip_next_orphan) {
@ -2195,25 +2199,51 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
iter = oi->ip_next_orphan;
oi->ip_next_orphan = NULL;
mutex_lock(&inode->i_mutex);
ret = ocfs2_rw_lock(inode, 1);
if (ret < 0) {
mlog_errno(ret);
goto next;
}
/*
* We need to take and drop the inode lock to
* force read inode from disk.
*/
ret = ocfs2_inode_lock(inode, &di_bh, 1);
if (ret) {
mlog_errno(ret);
goto unlock_rw;
}
if (oi->ip_flags & OCFS2_INODE_DIO_ORPHAN_ENTRY) {
mutex_lock(&inode->i_mutex);
ret = ocfs2_rw_lock(inode, 1);
if (ret < 0) {
mlog_errno(ret);
goto unlock_mutex;
}
/*
* We need to take and drop the inode lock to
* force read inode from disk.
*/
ret = ocfs2_inode_lock(inode, &di_bh, 1);
if (ret) {
mlog_errno(ret);
goto unlock_rw;
}
di = (struct ocfs2_dinode *)di_bh->b_data;
di = (struct ocfs2_dinode *)di_bh->b_data;
if (inode->i_nlink == 0) {
if (di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL)) {
ret = ocfs2_truncate_file(inode, di_bh,
i_size_read(inode));
if (ret < 0) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto unlock_inode;
}
ret = ocfs2_del_inode_from_orphan(osb, inode,
di_bh, 0, 0);
if (ret)
mlog_errno(ret);
}
unlock_inode:
ocfs2_inode_unlock(inode, 1);
brelse(di_bh);
di_bh = NULL;
unlock_rw:
ocfs2_rw_unlock(inode, 1);
unlock_mutex:
mutex_unlock(&inode->i_mutex);
/* clear dio flag in ocfs2_inode_info */
oi->ip_flags &= ~OCFS2_INODE_DIO_ORPHAN_ENTRY;
} else {
spin_lock(&oi->ip_lock);
/* Set the proper information to get us going into
* ocfs2_delete_inode. */
@ -2221,28 +2251,6 @@ static int ocfs2_recover_orphans(struct ocfs2_super *osb,
spin_unlock(&oi->ip_lock);
}
if ((orphan_reco_type == ORPHAN_NEED_TRUNCATE) &&
(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
ret = ocfs2_truncate_file(inode, di_bh,
i_size_read(inode));
if (ret < 0) {
if (ret != -ENOSPC)
mlog_errno(ret);
goto unlock_inode;
}
ret = ocfs2_del_inode_from_orphan(osb, inode, di_bh, 0, 0);
if (ret)
mlog_errno(ret);
} /* else if ORPHAN_NO_NEED_TRUNCATE, do nothing */
unlock_inode:
ocfs2_inode_unlock(inode, 1);
brelse(di_bh);
di_bh = NULL;
unlock_rw:
ocfs2_rw_unlock(inode, 1);
next:
mutex_unlock(&inode->i_mutex);
iput(inode);
inode = iter;
}