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| author | Al Viro <viro@zeniv.linux.org.uk> | 2020-01-17 06:05:18 +0300 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2020-02-27 22:43:55 +0300 |
| commit | 1c9f5e06a613cc48608db1a4207b8bd5ebe70a81 (patch) | |
| tree | e7cf80bfc47a94dc5642ac96b8adcf9f0a49473b /fs | |
| parent | 25e195aa1e607f129ab912d29fcfc79239703307 (diff) | |
| download | linux-1c9f5e06a613cc48608db1a4207b8bd5ebe70a81.tar.xz | |
follow_automount() doesn't need the entire nameidata
Only the address of ->total_link_count and the flags.
And fix an off-by-one is ELOOP detection - make it
consistent with symlink following, where we check if
the pre-increment value has reached 40, rather than
check the post-increment one.
[kudos to Christian Brauner for spotted braino]
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/namei.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/fs/namei.c b/fs/namei.c index 39dd56f5171f..6721c5f7e9d5 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -1208,7 +1208,7 @@ EXPORT_SYMBOL(follow_up); * - return -EISDIR to tell follow_managed() to stop and return the path we * were called with. */ -static int follow_automount(struct path *path, struct nameidata *nd) +static int follow_automount(struct path *path, int *count, unsigned lookup_flags) { struct dentry *dentry = path->dentry; @@ -1223,13 +1223,12 @@ static int follow_automount(struct path *path, struct nameidata *nd) * as being automount points. These will need the attentions * of the daemon to instantiate them before they can be used. */ - if (!(nd->flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY | + if (!(lookup_flags & (LOOKUP_PARENT | LOOKUP_DIRECTORY | LOOKUP_OPEN | LOOKUP_CREATE | LOOKUP_AUTOMOUNT)) && dentry->d_inode) return -EISDIR; - nd->total_link_count++; - if (nd->total_link_count >= 40) + if (count && (*count)++ >= MAXSYMLINKS) return -ELOOP; return finish_automount(dentry->d_op->d_automount(path), path); @@ -1290,7 +1289,8 @@ static int follow_managed(struct path *path, struct nameidata *nd) /* Handle an automount point */ if (flags & DCACHE_NEED_AUTOMOUNT) { - ret = follow_automount(path, nd); + ret = follow_automount(path, &nd->total_link_count, + nd->flags); if (ret < 0) break; continue; |