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| author | Al Viro <viro@zeniv.linux.org.uk> | 2015-05-06 16:01:56 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-05-10 22:20:19 -0400 |
| commit | 1cf2665b5bdfc63185fb4a416bff54b14ad30c79 (patch) | |
| tree | 0a606d138500121f4eea4b0fc8037d975f64bd47 /fs/namei.c | |
| parent | fec2fa24e84a75447341a20d36e808c8d913a81a (diff) | |
| download | lwn-1cf2665b5bdfc63185fb4a416bff54b14ad30c79.tar.gz lwn-1cf2665b5bdfc63185fb4a416bff54b14ad30c79.zip | |
namei: kill nd->link
Just store it in nd->stack[nd->depth].link right in pick_link().
Now that we make sure of stack expansion in pick_link(), we can
do so...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 18 |
1 files changed, 8 insertions, 10 deletions
diff --git a/fs/namei.c b/fs/namei.c index 82cb1bc9a1bf..277ca86fc6c6 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -495,10 +495,7 @@ EXPORT_SYMBOL(path_put); #define EMBEDDED_LEVELS 2 struct nameidata { struct path path; - union { - struct qstr last; - struct path link; - }; + struct qstr last; struct path root; struct inode *inode; /* path.dentry.d_inode */ unsigned int flags; @@ -787,7 +784,7 @@ static inline int may_follow_link(struct nameidata *nd) return 0; /* Allowed if owner and follower match. */ - inode = nd->link.dentry->d_inode; + inode = nd->stack[0].link.dentry->d_inode; if (uid_eq(current_cred()->fsuid, inode->i_uid)) return 0; @@ -800,8 +797,8 @@ static inline int may_follow_link(struct nameidata *nd) if (uid_eq(parent->i_uid, inode->i_uid)) return 0; - audit_log_link_denied("follow_link", &nd->link); - path_put(&nd->link); + audit_log_link_denied("follow_link", &nd->stack[0].link); + path_put(&nd->stack[0].link); path_put(&nd->path); return -EACCES; } @@ -879,14 +876,13 @@ static __always_inline const char *get_link(struct nameidata *nd) { struct saved *last = nd->stack + nd->depth; - struct dentry *dentry = nd->link.dentry; + struct dentry *dentry = last->link.dentry; struct inode *inode = dentry->d_inode; int error; const char *res; BUG_ON(nd->flags & LOOKUP_RCU); - last->link = nd->link; last->cookie = NULL; nd->depth++; @@ -1560,6 +1556,7 @@ static void terminate_walk(struct nameidata *nd) static int pick_link(struct nameidata *nd, struct path *link) { int error; + struct saved *last; if (unlikely(nd->total_link_count++ >= MAXSYMLINKS)) { path_to_nameidata(link, nd); return -ELOOP; @@ -1578,7 +1575,8 @@ static int pick_link(struct nameidata *nd, struct path *link) return error; } - nd->link = *link; + last = nd->stack + nd->depth; + last->link = *link; return 1; } |