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untangling do_lookup() - massage !dentry case towards __lookup_hash() 

Reorder if-else cases for starters...

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2012-03-30 14:34:00 -04:00
parent 08b0ab7c20
commit d774a058d9
1 changed files with 20 additions and 25 deletions
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45
fs/namei.c
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@ -1174,39 +1174,34 @@ static int do_lookup(struct nameidata *nd, struct qstr *name,
mutex_lock(&dir->i_mutex);
dentry = d_lookup(parent, name);
if (likely(!dentry)) {
dentry = d_alloc_and_lookup(parent, name, nd);
if (IS_ERR(dentry)) {
mutex_unlock(&dir->i_mutex);
return PTR_ERR(dentry);
}
/* known good */
status = 1;
} else if (unlikely(d_need_lookup(dentry))) {
if (dentry && d_need_lookup(dentry)) {
dentry = d_inode_lookup(parent, dentry, nd);
if (IS_ERR(dentry)) {
mutex_unlock(&dir->i_mutex);
return PTR_ERR(dentry);
}
/* known good */
status = 1;
} else if (unlikely(dentry->d_flags & DCACHE_OP_REVALIDATE))
} else if (dentry && (dentry->d_flags & DCACHE_OP_REVALIDATE)) {
status = d_revalidate(dentry, nd);
if (unlikely(status <= 0)) {
if (status < 0) {
mutex_unlock(&dir->i_mutex);
dput(dentry);
return status;
}
if (!d_invalidate(dentry)) {
dput(dentry);
dentry = d_alloc_and_lookup(parent, name, nd);
if (IS_ERR(dentry)) {
if (unlikely(status <= 0)) {
if (status < 0) {
mutex_unlock(&dir->i_mutex);
return PTR_ERR(dentry);
dput(dentry);
return status;
}
/* known good */
status = 1;
if (!d_invalidate(dentry)) {
dput(dentry);
dentry = d_alloc_and_lookup(parent, name, nd);
if (IS_ERR(dentry)) {
mutex_unlock(&dir->i_mutex);
return PTR_ERR(dentry);
}
}
}
} else if (!dentry) {
dentry = d_alloc_and_lookup(parent, name, nd);
if (IS_ERR(dentry)) {
mutex_unlock(&dir->i_mutex);
return PTR_ERR(dentry);
}
}
mutex_unlock(&dir->i_mutex);