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gfs2: Abort gfs2_freeze if io error is seen

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Before this patch, an io error, such as -EIO writing to the journal
would cause function gfs2_freeze to go into an infinite loop,
continuously retrying the freeze operation. But nothing ever clears
the -EIO except unmount after withdraw, which is impossible if the
freeze operation never ends (fails). Instead you get:

[ 6499.767994] gfs2: fsid=dm-32.0: error freezing FS: -5
[ 6499.773058] gfs2: fsid=dm-32.0: retrying...
[ 6500.791957] gfs2: fsid=dm-32.0: error freezing FS: -5
[ 6500.797015] gfs2: fsid=dm-32.0: retrying...

This patch adds a check for -EIO in gfs2_freeze, and if seen, it
dequeues the freeze glock, aborts the loop and returns the error.
Also, there's no need to pass the freeze holder to function
gfs2_lock_fs_check_clean since it's only called in one place and
it's a well-known superblock pointer, so this simplifies that.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
This commit is contained in:
Bob Peterson 2019-11-15 09:42:46 -05:00 committed by Andreas Gruenbacher
parent 60528afa78
commit 52b1cdcb7a
1 changed files with 12 additions and 7 deletions
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19
fs/gfs2/super.c
View File

@ -399,8 +399,7 @@ struct lfcc {
* Returns: errno
*/
static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
struct gfs2_holder *freeze_gh)
static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
{
struct gfs2_inode *ip;
struct gfs2_jdesc *jd;
@ -425,7 +424,9 @@ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
}
error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
GL_NOCACHE, freeze_gh);
GL_NOCACHE, &sdp->sd_freeze_gh);
if (error)
goto out;
list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
error = gfs2_jdesc_check(jd);
@ -441,7 +442,7 @@ static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
}
if (error)
gfs2_glock_dq_uninit(freeze_gh);
gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
out:
while (!list_empty(&list)) {
@ -767,15 +768,19 @@ static int gfs2_freeze(struct super_block *sb)
goto out;
}
error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh);
error = gfs2_lock_fs_check_clean(sdp);
if (!error)
break;
if (error == -EBUSY)
fs_err(sdp, "waiting for recovery before freeze\n");
else
else if (error == -EIO) {
fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
"to recovery error.\n");
goto out;
} else {
fs_err(sdp, "error freezing FS: %d\n", error);
}
fs_err(sdp, "retrying...\n");
msleep(1000);
}