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| author | Arjan van de Ven <arjan@infradead.org> | 2006-07-03 09:25:16 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-07-04 00:27:08 +0200 |
| commit | c6573c2904231279de0584787d6214f19a128d0b (patch) | |
| tree | 6d751e87c8b069d10f9e199a0e1df791fd822b7d /net | |
| parent | [PATCH] lockdep: annotate ->mmap_sem (diff) | |
| download | linux-c6573c2904231279de0584787d6214f19a128d0b.tar.xz linux-c6573c2904231279de0584787d6214f19a128d0b.zip | |
[PATCH] lockdep: annotate sunrpc code
Add i_mutex ordering annotations to the sunrpc rpc_pipe code. This code has 3
levels of i_mutex hierarchy in some cases: parent dir, client dir and file
inside client dir; the i_mutex ordering is I_MUTEX_PARENT -> I_MUTEX_CHILD ->
I_MUTEX_NORMAL
This patch applies this ordering annotation to the various functions. This is
in line with the VFS expected ordering where it is always OK to lock a child
after locking a parent; the sunrpc code is very diligent in doing this
correctly.
Has no effect on non-lockdep kernels.
Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Cc: Trond Myklebust <trond.myklebust@fys.uio.no>
Cc: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'net')
| -rw-r--r-- | net/sunrpc/rpc_pipe.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/net/sunrpc/rpc_pipe.c b/net/sunrpc/rpc_pipe.c index 6db6006616c6..dc6cb93c8830 100644 --- a/net/sunrpc/rpc_pipe.c +++ b/net/sunrpc/rpc_pipe.c @@ -515,7 +515,7 @@ rpc_depopulate(struct dentry *parent) struct dentry *dentry, *dvec[10]; int n = 0; - mutex_lock(&dir->i_mutex); + mutex_lock_nested(&dir->i_mutex, I_MUTEX_CHILD); repeat: spin_lock(&dcache_lock); list_for_each_safe(pos, next, &parent->d_subdirs) { @@ -631,7 +631,7 @@ rpc_lookup_negative(char *path, struct nameidata *nd) if ((error = rpc_lookup_parent(path, nd)) != 0) return ERR_PTR(error); dir = nd->dentry->d_inode; - mutex_lock(&dir->i_mutex); + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); dentry = lookup_one_len(nd->last.name, nd->dentry, nd->last.len); if (IS_ERR(dentry)) goto out_err; @@ -693,7 +693,7 @@ rpc_rmdir(char *path) if ((error = rpc_lookup_parent(path, &nd)) != 0) return error; dir = nd.dentry->d_inode; - mutex_lock(&dir->i_mutex); + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); if (IS_ERR(dentry)) { error = PTR_ERR(dentry); @@ -754,7 +754,7 @@ rpc_unlink(char *path) if ((error = rpc_lookup_parent(path, &nd)) != 0) return error; dir = nd.dentry->d_inode; - mutex_lock(&dir->i_mutex); + mutex_lock_nested(&dir->i_mutex, I_MUTEX_PARENT); dentry = lookup_one_len(nd.last.name, nd.dentry, nd.last.len); if (IS_ERR(dentry)) { error = PTR_ERR(dentry); |