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authorJeff Moyer <jmoyer@redhat.com>2008-05-01 04:35:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-05-01 08:04:01 -0700
commit9d2de6ad2a78bb8b60bf7a54e6043dca44e9a801 (patch)
tree6e5b7aea51d739ba0e26e4d795d53093ded3933a
parent033790449ba9c4dcf8478a87693d33df625c23b5 (diff)
autofs4: fix incorrect return from root.c:try_to_fill_dentry()
Jeff Moyer has identified a case where the autofs4 function root.c:try_to_fill_dentry() can return -EBUSY when it should return 0. Jeff's description of the way this happens is: "automount starts an expire for directory d. after the callout to the daemon, but before the rmdir, another process tries to walk into the same directory. It puts itself onto the waitq, pending the expiration. When the expire finishes, the second process is woken up. In try_to_fill_dentry, it does this check: status = d_invalidate(dentry); if (status != -EBUSY) return -EAGAIN; And status is EBUSY. The dentry still has a non-zero d_inode, and the flags do not contain LOOKUP_CONTINUE or LOOKUP_DIRECTORY So, we fall through and return -EBUSY to the caller." Signed-off-by: Jeff Moyer <jmoyer@redhat.com> Signed-off-by: Ian Kent <raven@themaw.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--fs/autofs4/root.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/autofs4/root.c b/fs/autofs4/root.c
index 0533d37c73a..6e250030a69 100644
--- a/fs/autofs4/root.c
+++ b/fs/autofs4/root.c
@@ -243,7 +243,7 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags)
struct autofs_sb_info *sbi = autofs4_sbi(dentry->d_sb);
struct autofs_info *ino = autofs4_dentry_ino(dentry);
struct dentry *new;
- int status = 0;
+ int status;
/* Block on any pending expiry here; invalidate the dentry
when expiration is done to trigger mount request with a new
@@ -340,7 +340,7 @@ static int try_to_fill_dentry(struct dentry *dentry, int flags)
}
}
- return status;
+ return 0;
}
/* For autofs direct mounts the follow link triggers the mount */