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author | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-06 01:07:21 (GMT) |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2015-12-07 02:18:10 (GMT) |
commit | 9e6697e26f9888cdb6088664d31c3772b0dff0a4 (patch) | |
tree | f927777006c603a0fafea0643cf352deedfe776c /fs/namei.c | |
parent | 0e81ba231239b58c8b17dca18c6345c13e793824 (diff) | |
download | linux-9e6697e26f9888cdb6088664d31c3772b0dff0a4.tar.xz |
namei.c: fold set_root_rcu() into set_root()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs/namei.c')
-rw-r--r-- | fs/namei.c | 44 |
1 files changed, 20 insertions, 24 deletions
@@ -807,19 +807,19 @@ static int complete_walk(struct nameidata *nd) static void set_root(struct nameidata *nd) { - get_fs_root(current->fs, &nd->root); -} - -static void set_root_rcu(struct nameidata *nd) -{ struct fs_struct *fs = current->fs; - unsigned seq; - do { - seq = read_seqcount_begin(&fs->seq); - nd->root = fs->root; - nd->root_seq = __read_seqcount_begin(&nd->root.dentry->d_seq); - } while (read_seqcount_retry(&fs->seq, seq)); + if (nd->flags & LOOKUP_RCU) { + unsigned seq; + + do { + seq = read_seqcount_begin(&fs->seq); + nd->root = fs->root; + nd->root_seq = __read_seqcount_begin(&nd->root.dentry->d_seq); + } while (read_seqcount_retry(&fs->seq, seq)); + } else { + get_fs_root(fs, &nd->root); + } } static void path_put_conditional(struct path *path, struct nameidata *nd) @@ -1015,10 +1015,10 @@ const char *get_link(struct nameidata *nd) } } if (*res == '/') { + if (!nd->root.mnt) + set_root(nd); if (nd->flags & LOOKUP_RCU) { struct dentry *d; - if (!nd->root.mnt) - set_root_rcu(nd); nd->path = nd->root; d = nd->path.dentry; nd->inode = d->d_inode; @@ -1026,8 +1026,6 @@ const char *get_link(struct nameidata *nd) if (unlikely(read_seqcount_retry(&d->d_seq, nd->seq))) return ERR_PTR(-ECHILD); } else { - if (!nd->root.mnt) - set_root(nd); path_put(&nd->path); nd->path = nd->root; path_get(&nd->root); @@ -1294,8 +1292,6 @@ static bool __follow_mount_rcu(struct nameidata *nd, struct path *path, static int follow_dotdot_rcu(struct nameidata *nd) { struct inode *inode = nd->inode; - if (!nd->root.mnt) - set_root_rcu(nd); while (1) { if (path_equal(&nd->path, &nd->root)) @@ -1415,9 +1411,6 @@ static void follow_mount(struct path *path) static int follow_dotdot(struct nameidata *nd) { - if (!nd->root.mnt) - set_root(nd); - while(1) { struct dentry *old = nd->path.dentry; @@ -1655,6 +1648,8 @@ static inline int may_lookup(struct nameidata *nd) static inline int handle_dots(struct nameidata *nd, int type) { if (type == LAST_DOTDOT) { + if (!nd->root.mnt) + set_root(nd); if (nd->flags & LOOKUP_RCU) { return follow_dotdot_rcu(nd); } else @@ -2023,15 +2018,16 @@ static const char *path_init(struct nameidata *nd, unsigned flags) nd->m_seq = read_seqbegin(&mount_lock); if (*s == '/') { - if (flags & LOOKUP_RCU) { + if (flags & LOOKUP_RCU) rcu_read_lock(); - set_root_rcu(nd); + set_root(nd); + if (flags & LOOKUP_RCU) { nd->seq = nd->root_seq; + nd->path = nd->root; } else { - set_root(nd); path_get(&nd->root); + nd->path = nd->root; } - nd->path = nd->root; } else if (nd->dfd == AT_FDCWD) { if (flags & LOOKUP_RCU) { struct fs_struct *fs = current->fs; |