AcoSail/kernel_optimize_test
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lookup_dcache(): lift d_alloc() into callers

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... and kill need_lookup thing

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2016-03-05 20:09:32 -05:00
parent 6583fe22d1
commit 6c51e513a3
1 changed files with 17 additions and 18 deletions
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35
fs/namei.c
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@ -1448,12 +1448,11 @@ static int follow_dotdot(struct nameidata *nd)
* dir->d_inode->i_mutex must be held
*/
static struct dentry *lookup_dcache(struct qstr *name, struct dentry *dir,
unsigned int flags, bool *need_lookup)
unsigned int flags)
{
struct dentry *dentry;
int error;
*need_lookup = false;
dentry = d_lookup(dir, name);
if (dentry) {
if (dentry->d_flags & DCACHE_OP_REVALIDATE) {
@ -1470,14 +1469,6 @@ static struct dentry *lookup_dcache(struct qstr *name, struct dentry *dir,
}
}
}
if (!dentry) {
dentry = d_alloc(dir, name);
if (unlikely(!dentry))
return ERR_PTR(-ENOMEM);
*need_lookup = true;
}
return dentry;
}
@ -1509,13 +1500,15 @@ static struct dentry *lookup_real(struct inode *dir, struct dentry *dentry,
static struct dentry *__lookup_hash(struct qstr *name,
struct dentry *base, unsigned int flags)
{
bool need_lookup;
struct dentry *dentry;
struct dentry *dentry = lookup_dcache(name, base, flags);
dentry = lookup_dcache(name, base, flags, &need_lookup);
if (!need_lookup)
if (dentry)
return dentry;
dentry = d_alloc(base, name);
if (unlikely(!dentry))
return ERR_PTR(-ENOMEM);
return lookup_real(base->d_inode, dentry, flags);
}
@ -3018,16 +3011,22 @@ static int lookup_open(struct nameidata *nd, struct path *path,
struct inode *dir_inode = dir->d_inode;
struct dentry *dentry;
int error;
bool need_lookup;
bool need_lookup = false;
*opened &= ~FILE_CREATED;
dentry = lookup_dcache(&nd->last, dir, nd->flags, &need_lookup);
dentry = lookup_dcache(&nd->last, dir, nd->flags);
if (IS_ERR(dentry))
return PTR_ERR(dentry);
/* Cached positive dentry: will open in f_op->open */
if (!need_lookup && dentry->d_inode)
if (!dentry) {
dentry = d_alloc(dir, &nd->last);
if (unlikely(!dentry))
return -ENOMEM;
need_lookup = true;
} else if (dentry->d_inode) {
/* Cached positive dentry: will open in f_op->open */
goto out_no_open;
}
if ((nd->flags & LOOKUP_OPEN) && dir_inode->i_op->atomic_open) {
return atomic_open(nd, dentry, path, file, op, got_write,