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Ian Kent 1864f7bd58 autofs4: deadlock during create ... Due to inconsistent locking in the VFS between calls to lookup and revalidate deadlock can occur in the automounter. The inconsistency is that the directory inode mutex is held for both lookup and revalidate calls when called via lookup_hash whereas it is held only for lookup during a path walk. Consequently, if the mutex is held during a call to revalidate autofs4 can't release the mutex to callback the daemon as it can't know whether it owns the mutex. This situation happens when a process tries to create a directory within an automount and a second process also tries to create the same directory between the lookup and the mkdir. Since the first process has dropped the mutex for the daemon callback, the second process takes it during revalidate leading to deadlock between the autofs daemon and the second process when the daemon tries to create the mount point directory. After spending quite a bit of time trying to resolve this on more than one occassion, using rather complex and ulgy approaches, it turns out that just delaying the hashing of the dentry until the create operation works fine. 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>		18 years ago
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Makefile	Linux-2.6.12-rc2	20 years ago
autofs_i.h	[PATCH] autofs4: fix another race between mount and expire	18 years ago
expire.c	[PATCH] autofs4: zero timeout prevents shutdown	19 years ago
init.c	[PATCH] AUTOFS: Make sure all dentries refs are released before calling kill_anon_super()	19 years ago
inode.c	Fix some coding-style errors in autofs	18 years ago
root.c	autofs4: deadlock during create	18 years ago
symlink.c	[PATCH] mark struct inode_operations const 1	18 years ago
waitq.c	[PATCH] autofs4: header file update	18 years ago