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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>
This commit is contained in:
Jeff Moyer 2008-05-01 04:35:09 -07:00 committed by Linus Torvalds
parent 033790449b
commit 9d2de6ad2a
1 changed files with 2 additions and 2 deletions
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4
fs/autofs4/root.c
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@ -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 */