diff options
author | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-06 04:51:58 +0300 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-07 05:18:21 +0300 |
commit | 248fb5b9557aa117f0b8c68b8cf2ce436e4d839d (patch) | |
tree | 496d169de9617a129c30c24271575bfd09c3f08b /fs | |
parent | ef55d91700d54f29b9ac301658b5b8f377ef3206 (diff) | |
download | linux-248fb5b9557aa117f0b8c68b8cf2ce436e4d839d.tar.xz |
namei.c: take "jump to root" into a new helper
... and use it both in path_init() (for absolute pathnames) and
get_link() (for absolute symlinks).
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/namei.c | 54 |
1 files changed, 26 insertions, 28 deletions
diff --git a/fs/namei.c b/fs/namei.c index a08018b1485c..0baf64b116bd 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -841,6 +841,26 @@ static inline void path_to_nameidata(const struct path *path, nd->path.dentry = path->dentry; } +static int nd_jump_root(struct nameidata *nd) +{ + if (nd->flags & LOOKUP_RCU) { + struct dentry *d; + nd->path = nd->root; + d = nd->path.dentry; + nd->inode = d->d_inode; + nd->seq = nd->root_seq; + if (unlikely(read_seqcount_retry(&d->d_seq, nd->seq))) + return -ECHILD; + } else { + path_put(&nd->path); + nd->path = nd->root; + path_get(&nd->path); + nd->inode = nd->path.dentry->d_inode; + } + nd->flags |= LOOKUP_JUMPED; + return 0; +} + /* * Helper to directly jump to a known parsed path from ->follow_link, * caller must have taken a reference to path beforehand. @@ -1017,21 +1037,8 @@ const char *get_link(struct nameidata *nd) if (*res == '/') { if (!nd->root.mnt) set_root(nd); - if (nd->flags & LOOKUP_RCU) { - struct dentry *d; - nd->path = nd->root; - d = nd->path.dentry; - nd->inode = d->d_inode; - nd->seq = nd->root_seq; - if (unlikely(read_seqcount_retry(&d->d_seq, nd->seq))) - return ERR_PTR(-ECHILD); - } else { - path_put(&nd->path); - nd->path = nd->root; - path_get(&nd->root); - nd->inode = nd->path.dentry->d_inode; - } - nd->flags |= LOOKUP_JUMPED; + if (unlikely(nd_jump_root(nd))) + return ERR_PTR(-ECHILD); while (unlikely(*++res == '/')) ; } @@ -2015,26 +2022,17 @@ static const char *path_init(struct nameidata *nd, unsigned flags) } nd->root.mnt = NULL; + nd->path.mnt = NULL; + nd->path.dentry = NULL; nd->m_seq = read_seqbegin(&mount_lock); if (*s == '/') { if (flags & LOOKUP_RCU) rcu_read_lock(); set_root(nd); - if (flags & LOOKUP_RCU) { - nd->seq = nd->root_seq; - nd->path = nd->root; - } else { - path_get(&nd->root); - nd->path = nd->root; - } - nd->inode = nd->path.dentry->d_inode; - if (!(flags & LOOKUP_RCU)) - return s; - if (likely(!read_seqcount_retry(&nd->path.dentry->d_seq, nd->seq))) + if (likely(!nd_jump_root(nd))) return s; - if (!(nd->flags & LOOKUP_ROOT)) - nd->root.mnt = NULL; + nd->root.mnt = NULL; rcu_read_unlock(); return ERR_PTR(-ECHILD); } else if (nd->dfd == AT_FDCWD) { |