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gfs2: Check inode generation number in delete_work_func

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In delete_work_func, if the iopen glock still has an inode attached,
limit the inode lookup to that specific generation number: in the likely
case that the inode was deleted on the node on which the inode's link
count dropped to zero, we can skip verifying the on-disk block type and
reading in the inode.  The same applies if another node that had the
inode open managed to delete the inode before us.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Andreas Gruenbacher 2020-01-15 09:54:14 +01:00
parent b66648ad6d
commit b0dcffd8da
2 changed files with 7 additions and 2 deletions
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4
fs/gfs2/glock.c
View File

@ -795,6 +795,7 @@ static bool gfs2_try_evict(struct gfs2_glock *gl)
ip = NULL;
spin_unlock(&gl->gl_lockref.lock);
if (ip) {
gl->gl_no_formal_ino = ip->i_no_formal_ino;
set_bit(GIF_DEFERRED_DELETE, &ip->i_flags);
d_prune_aliases(&ip->i_inode);
iput(&ip->i_inode);
@ -843,7 +844,8 @@ static void delete_work_func(struct work_struct *work)
}
}
inode = gfs2_lookup_by_inum(sdp, no_addr, 0, GFS2_BLKST_UNLINKED);
inode = gfs2_lookup_by_inum(sdp, no_addr, gl->gl_no_formal_ino,
GFS2_BLKST_UNLINKED);
if (!IS_ERR_OR_NULL(inode)) {
d_prune_aliases(inode);
iput(inode);

5
fs/gfs2/incore.h
View File

@ -380,7 +380,10 @@ struct gfs2_glock {
struct delayed_work gl_work;
union {
/* For iopen glocks only */
struct delayed_work gl_delete;
struct {
struct delayed_work gl_delete;
u64 gl_no_formal_ino;
};
/* For rgrp glocks only */
struct {
loff_t start;