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untangling do_lookup() - eliminate a loop.

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d_lookup() *will* fail after successful d_invalidate(), if we are
holding i_mutex all along.  IOW, we don't need to jump back to
l: - we know what path will be taken there and can do that (i.e.
d_alloc_and_lookup()) directly.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-03-30 14:13:15 -04:00
parent 37c17e1f37
commit acc9cb3cd4
1 changed files with 8 additions and 4 deletions
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12
fs/namei.c
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@ -1173,7 +1173,6 @@ retry:
BUG_ON(nd->inode != dir); BUG_ON(nd->inode != dir);
mutex_lock(&dir->i_mutex); mutex_lock(&dir->i_mutex);
l:
dentry = d_lookup(parent, name); dentry = d_lookup(parent, name);
if (likely(!dentry)) { if (likely(!dentry)) {
dentry = d_alloc_and_lookup(parent, name, nd); dentry = d_alloc_and_lookup(parent, name, nd);
@ -1204,9 +1203,14 @@ l:
} }
if (!d_invalidate(dentry)) { if (!d_invalidate(dentry)) {
dput(dentry); dput(dentry);
dentry = NULL; dentry = d_alloc_and_lookup(parent, name, nd);
need_reval = 1; if (IS_ERR(dentry)) {
goto l; mutex_unlock(&dir->i_mutex);
return PTR_ERR(dentry);
}
/* known good */
need_reval = 0;
status = 1;
} }
} }
mutex_unlock(&dir->i_mutex); mutex_unlock(&dir->i_mutex);