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Subject[PATCH v3 067/110] namei: take put_link() into {lookup,mountpoint,do}_last()
Date
From: Al Viro <viro@zeniv.linux.org.uk>

rationale: we'll need to have terminate_walk() do put_link() on
everything, which will mean that in some cases ..._last() will do
put_link() anyway. Easier to have them do it in all cases.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/namei.c | 34 +++++++++++++++++++++-------------
1 file changed, 21 insertions(+), 13 deletions(-)

diff --git a/fs/namei.c b/fs/namei.c
index db21e04..26466fb 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -2018,6 +2018,8 @@ static inline int lookup_last(struct nameidata *nd)

nd->flags &= ~LOOKUP_PARENT;
err = walk_component(nd, nd->flags & LOOKUP_FOLLOW);
+ if (nd->depth)
+ put_link(nd);
if (err < 0)
terminate_walk(nd);
return err;
@@ -2045,13 +2047,10 @@ static int path_lookupat(int dfd, const struct filename *name,
*/
err = path_init(dfd, name, flags, nd);
if (!err && !(flags & LOOKUP_PARENT)) {
- err = lookup_last(nd);
- while (err > 0) {
+ while ((err = lookup_last(nd)) > 0) {
err = trailing_symlink(nd);
if (err)
break;
- err = lookup_last(nd);
- put_link(nd);
}
}

@@ -2362,6 +2361,8 @@ done:
dput(dentry);
goto out;
}
+ if (nd->depth)
+ put_link(nd);
path->dentry = dentry;
path->mnt = nd->path.mnt;
if (should_follow_link(dentry, nd->flags & LOOKUP_FOLLOW)) {
@@ -2373,6 +2374,8 @@ done:
error = 0;
out:
terminate_walk(nd);
+ if (nd->depth)
+ put_link(nd);
return error;
}

@@ -2394,13 +2397,10 @@ path_mountpoint(int dfd, const struct filename *name, struct path *path,
if (unlikely(err))
goto out;

- err = mountpoint_last(nd, path);
- while (err > 0) {
+ while ((err = mountpoint_last(nd, path)) > 0) {
err = trailing_symlink(nd);
if (err)
break;
- err = mountpoint_last(nd, path);
- put_link(nd);
}
out:
path_cleanup(nd);
@@ -2978,6 +2978,8 @@ static int do_last(struct nameidata *nd,
error = handle_dots(nd, nd->last_type);
if (unlikely(error)) {
terminate_walk(nd);
+ if (nd->depth)
+ put_link(nd);
return error;
}
goto finish_open;
@@ -3003,8 +3005,11 @@ static int do_last(struct nameidata *nd,
* about to look up
*/
error = complete_walk(nd);
- if (error)
+ if (error) {
+ if (nd->depth)
+ put_link(nd);
return error;
+ }

audit_inode(name, dir, LOOKUP_PARENT);
error = -EISDIR;
@@ -3093,6 +3098,8 @@ finish_lookup:
}
}
BUG_ON(inode != path.dentry->d_inode);
+ if (nd->depth)
+ put_link(nd);
nd->link = path;
return 1;
}
@@ -3116,6 +3123,8 @@ finish_lookup:
finish_open:
error = complete_walk(nd);
if (error) {
+ if (nd->depth)
+ put_link(nd);
path_put(&save_parent);
return error;
}
@@ -3167,6 +3176,8 @@ out:
mnt_drop_write(nd->path.mnt);
path_put(&save_parent);
terminate_walk(nd);
+ if (nd->depth)
+ put_link(nd);
return error;

exit_dput:
@@ -3279,14 +3290,11 @@ static struct file *path_openat(int dfd, struct filename *pathname,
if (unlikely(error))
goto out;

- error = do_last(nd, file, op, &opened, pathname);
- while (unlikely(error > 0)) { /* trailing symlink */
+ while ((error = do_last(nd, file, op, &opened, pathname)) > 0) {
nd->flags &= ~(LOOKUP_OPEN|LOOKUP_CREATE|LOOKUP_EXCL);
error = trailing_symlink(nd);
if (unlikely(error))
break;
- error = do_last(nd, file, op, &opened, pathname);
- put_link(nd);
}
out:
path_cleanup(nd);
--
2.1.4


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