From: "Darrick J. Wong" <darrick.wong@oracle.com>
To: xfs <linux-xfs@vger.kernel.org>
Subject: [PATCH] xfs: allow parent directory scans to be interrupted with fatal signals
Date: Tue, 26 Nov 2019 08:15:17 -0800 [thread overview]
Message-ID: <20191126161517.GO6219@magnolia> (raw)
From: Darrick J. Wong <darrick.wong@oracle.com>
Allow a fatal signal to interrupt us when we're scanning a directory to
verify a parent pointer.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/scrub/parent.c | 25 ++++++++++++++++++++-----
1 file changed, 20 insertions(+), 5 deletions(-)
diff --git a/fs/xfs/scrub/parent.c b/fs/xfs/scrub/parent.c
index 17100a83e23e..5705adc43a75 100644
--- a/fs/xfs/scrub/parent.c
+++ b/fs/xfs/scrub/parent.c
@@ -32,8 +32,10 @@ xchk_setup_parent(
struct xchk_parent_ctx {
struct dir_context dc;
+ struct xfs_scrub *sc;
xfs_ino_t ino;
xfs_nlink_t nlink;
+ bool cancelled;
};
/* Look for a single entry in a directory pointing to an inode. */
@@ -47,11 +49,21 @@ xchk_parent_actor(
unsigned type)
{
struct xchk_parent_ctx *spc;
+ int error = 0;
spc = container_of(dc, struct xchk_parent_ctx, dc);
if (spc->ino == ino)
spc->nlink++;
- return 0;
+
+ /*
+ * If we're facing a fatal signal, bail out. Store the cancellation
+ * status separately because the VFS readdir code squashes error codes
+ * into short directory reads.
+ */
+ if (xchk_should_terminate(spc->sc, &error))
+ spc->cancelled = true;
+
+ return error;
}
/* Count the number of dentries in the parent dir that point to this inode. */
@@ -62,10 +74,9 @@ xchk_parent_count_parent_dentries(
xfs_nlink_t *nlink)
{
struct xchk_parent_ctx spc = {
- .dc.actor = xchk_parent_actor,
- .dc.pos = 0,
- .ino = sc->ip->i_ino,
- .nlink = 0,
+ .dc.actor = xchk_parent_actor,
+ .ino = sc->ip->i_ino,
+ .sc = sc,
};
size_t bufsize;
loff_t oldpos;
@@ -97,6 +108,10 @@ xchk_parent_count_parent_dentries(
error = xfs_readdir(sc->tp, parent, &spc.dc, bufsize);
if (error)
goto out;
+ if (spc.cancelled) {
+ error = -EAGAIN;
+ goto out;
+ }
if (oldpos == spc.dc.pos)
break;
oldpos = spc.dc.pos;
next reply other threads:[~2019-11-26 16:17 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-11-26 16:15 Darrick J. Wong [this message]
2019-11-27 13:05 ` [PATCH] xfs: allow parent directory scans to be interrupted with fatal signals Brian Foster
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