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namei: pick_link() callers already have inode 

no need to refetch (and once we move unlazy out of there, recheck ->d_seq).

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-05-07 19:54:34 -04:00
parent 63afdfc781
commit 181548c051
1 changed files with 11 additions and 7 deletions
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18
fs/namei.c
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@ -1545,7 +1545,8 @@ static void terminate_walk(struct nameidata *nd)
put_link(nd);
}
static int pick_link(struct nameidata *nd, struct path *link, unsigned seq)
static int pick_link(struct nameidata *nd, struct path *link,
struct inode *inode, unsigned seq)
{
int error;
struct saved *last;
@ -1570,7 +1571,7 @@ static int pick_link(struct nameidata *nd, struct path *link, unsigned seq)
last = nd->stack + nd->depth++;
last->link = *link;
last->cookie = NULL;
last->inode = d_backing_inode(link->dentry);
last->inode = inode;
return 1;
}
@ -1581,13 +1582,14 @@ static int pick_link(struct nameidata *nd, struct path *link, unsigned seq)
* for the common case.
*/
static inline int should_follow_link(struct nameidata *nd, struct path *link,
int follow, unsigned seq)
int follow,
struct inode *inode, unsigned seq)
{
if (likely(!d_is_symlink(link->dentry)))
return 0;
if (!follow)
return 0;
return pick_link(nd, link, seq);
return pick_link(nd, link, inode, seq);
}
enum {WALK_GET = 1, WALK_PUT = 2};
@ -1627,7 +1629,7 @@ static int walk_component(struct nameidata *nd, int flags)
if (flags & WALK_PUT)
put_link(nd);
err = should_follow_link(nd, &path, flags & WALK_GET, seq);
err = should_follow_link(nd, &path, flags & WALK_GET, inode, seq);
if (unlikely(err))
return err;
path_to_nameidata(&path, nd);
@ -2349,7 +2351,8 @@ done:
put_link(nd);
path->dentry = dentry;
path->mnt = nd->path.mnt;
error = should_follow_link(nd, path, nd->flags & LOOKUP_FOLLOW, 0);
error = should_follow_link(nd, path, nd->flags & LOOKUP_FOLLOW,
d_backing_inode(dentry), 0);
if (unlikely(error))
return error;
mntget(path->mnt);
@ -3063,7 +3066,8 @@ retry_lookup:
finish_lookup:
if (nd->depth)
put_link(nd);
error = should_follow_link(nd, &path, nd->flags & LOOKUP_FOLLOW, seq);
error = should_follow_link(nd, &path, nd->flags & LOOKUP_FOLLOW,
inode, seq);
if (unlikely(error))
return error;