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authorAl Viro <viro@zeniv.linux.org.uk>2016-11-14 09:39:36 +0300
committerAl Viro <viro@zeniv.linux.org.uk>2016-12-06 03:11:57 +0300
commit1c4ff1a87e46a06fc00a83da2fbbc3ac0298f221 (patch)
tree66a914e6069ea2cf99906e85879e6c178d3eef74 /fs/namei.c
parent7f49b471097011d03316d4ae1bc38f9c177126c3 (diff)
downloadlinux-1c4ff1a87e46a06fc00a83da2fbbc3ac0298f221.tar.xz
namei: invert WALK_PUT logics
... turning the condition for put_link() in walk_component() into "WALK_MORE not passed and depth is non-zero". Again, makes for simpler arguments. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r--fs/namei.c13
1 files changed, 7 insertions, 6 deletions
diff --git a/fs/namei.c b/fs/namei.c
index 379168db782b..57d60922396e 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1747,7 +1747,7 @@ static inline int should_follow_link(struct nameidata *nd, struct path *link,
return pick_link(nd, link, inode, seq);
}
-enum {WALK_GET = 1, WALK_PUT = 2};
+enum {WALK_GET = 1, WALK_MORE = 2};
static int walk_component(struct nameidata *nd, int flags)
{
@@ -1762,7 +1762,7 @@ static int walk_component(struct nameidata *nd, int flags)
*/
if (unlikely(nd->last_type != LAST_NORM)) {
err = handle_dots(nd, nd->last_type);
- if (flags & WALK_PUT)
+ if (!(flags & WALK_MORE) && nd->depth)
put_link(nd);
return err;
}
@@ -1789,7 +1789,7 @@ static int walk_component(struct nameidata *nd, int flags)
inode = d_backing_inode(path.dentry);
}
- if (flags & WALK_PUT)
+ if (!(flags & WALK_MORE) && nd->depth)
put_link(nd);
err = should_follow_link(nd, &path, flags & WALK_GET, inode, seq);
if (unlikely(err))
@@ -2104,9 +2104,10 @@ OK:
if (!name)
return 0;
/* last component of nested symlink */
- err = walk_component(nd, WALK_GET | WALK_PUT);
- } else {
err = walk_component(nd, WALK_GET);
+ } else {
+ /* not the last component */
+ err = walk_component(nd, WALK_GET | WALK_MORE);
}
if (err < 0)
return err;
@@ -2248,7 +2249,7 @@ static inline int lookup_last(struct nameidata *nd)
nd->flags |= LOOKUP_FOLLOW | LOOKUP_DIRECTORY;
nd->flags &= ~LOOKUP_PARENT;
- return walk_component(nd, nd->depth ? WALK_PUT : 0);
+ return walk_component(nd, 0);
}
/* Returns 0 and nd will be valid on success; Retuns error, otherwise. */