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| author | Al Viro <viro@zeniv.linux.org.uk> | 2011-02-22 20:56:27 -0500 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2011-03-14 09:15:24 -0400 |
| commit | 086e183a641109033420e0b26ddecb6f4abb4c89 (patch) | |
| tree | c8b0c197c042c51140fc9b8bb8bfcf816fe29448 /fs | |
| parent | 16c2cd7179881d5dd87779512ca5a0d657c64f62 (diff) | |
| download | linux-3.10-086e183a641109033420e0b26ddecb6f4abb4c89.tar.gz linux-3.10-086e183a641109033420e0b26ddecb6f4abb4c89.tar.bz2 linux-3.10-086e183a641109033420e0b26ddecb6f4abb4c89.zip | |
pull dropping RCU on success of link_path_walk() into path_lookupat()
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/namei.c | 30 |
1 files changed, 12 insertions, 18 deletions
diff --git a/fs/namei.c b/fs/namei.c index 450b686e968..8f10a9ff9f6 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -539,14 +539,6 @@ err_unlock: return -ECHILD; } -/* Try to drop out of rcu-walk mode if we were in it, otherwise do nothing. */ -static inline int nameidata_drop_rcu_last_maybe(struct nameidata *nd) -{ - if (likely(nd->flags & LOOKUP_RCU)) - return nameidata_drop_rcu_last(nd); - return 0; -} - /** * release_open_intent - free up open intent resources * @nd: pointer to nameidata @@ -1339,7 +1331,7 @@ static int link_path_walk(const char *name, struct nameidata *nd) while (*name=='/') name++; if (!*name) - goto return_base; + return 0; if (nd->depth) lookup_flags = LOOKUP_FOLLOW | (nd->flags & LOOKUP_CONTINUE); @@ -1448,7 +1440,7 @@ last_component: } else follow_dotdot(nd); } - goto return_base; + return 0; } err = do_lookup(nd, &this, &next, &inode); if (err) @@ -1471,13 +1463,10 @@ last_component: if (!nd->inode->i_op->lookup) break; } - goto return_base; + return 0; lookup_parent: nd->last = this; nd->last_type = type; -return_base: - if (nameidata_drop_rcu_last_maybe(nd)) - return -ECHILD; return 0; out_dput: if (!(nd->flags & LOOKUP_RCU)) @@ -1598,10 +1587,15 @@ static int path_lookupat(int dfd, const char *name, if (nd->flags & LOOKUP_RCU) { /* RCU dangling. Cancel it. */ - nd->flags &= ~LOOKUP_RCU; - nd->root.mnt = NULL; - rcu_read_unlock(); - br_read_unlock(vfsmount_lock); + if (!retval) { + if (nameidata_drop_rcu_last(nd)) + retval = -ECHILD; + } else { + nd->flags &= ~LOOKUP_RCU; + nd->root.mnt = NULL; + rcu_read_unlock(); + br_read_unlock(vfsmount_lock); + } } if (!retval) |