diff options
Diffstat (limited to 'fs/autofs4/waitq.c')
| -rw-r--r-- | fs/autofs4/waitq.c | 40 |
1 files changed, 34 insertions, 6 deletions
diff --git a/fs/autofs4/waitq.c b/fs/autofs4/waitq.c index 2341375386f..56010056b2e 100644 --- a/fs/autofs4/waitq.c +++ b/fs/autofs4/waitq.c @@ -186,16 +186,26 @@ static int autofs4_getpath(struct autofs_sb_info *sbi, { struct dentry *root = sbi->sb->s_root; struct dentry *tmp; - char *buf = *name; + char *buf; char *p; - int len = 0; + int len; + unsigned seq; - spin_lock(&dcache_lock); +rename_retry: + buf = *name; + len = 0; + + seq = read_seqbegin(&rename_lock); + rcu_read_lock(); + spin_lock(&autofs4_lock); for (tmp = dentry ; tmp != root ; tmp = tmp->d_parent) len += tmp->d_name.len + 1; if (!len || --len > NAME_MAX) { - spin_unlock(&dcache_lock); + spin_unlock(&autofs4_lock); + rcu_read_unlock(); + if (read_seqretry(&rename_lock, seq)) + goto rename_retry; return 0; } @@ -208,7 +218,10 @@ static int autofs4_getpath(struct autofs_sb_info *sbi, p -= tmp->d_name.len; strncpy(p, tmp->d_name.name, tmp->d_name.len); } - spin_unlock(&dcache_lock); + spin_unlock(&autofs4_lock); + rcu_read_unlock(); + if (read_seqretry(&rename_lock, seq)) + goto rename_retry; return len; } @@ -296,6 +309,9 @@ static int validate_request(struct autofs_wait_queue **wait, * completed while we waited on the mutex ... */ if (notify == NFY_MOUNT) { + struct dentry *new = NULL; + int valid = 1; + /* * If the dentry was successfully mounted while we slept * on the wait queue mutex we can return success. If it @@ -303,8 +319,20 @@ static int validate_request(struct autofs_wait_queue **wait, * a multi-mount with no mount at it's base) we can * continue on and create a new request. */ + if (!IS_ROOT(dentry)) { + if (dentry->d_inode && d_unhashed(dentry)) { + struct dentry *parent = dentry->d_parent; + new = d_lookup(parent, &dentry->d_name); + if (new) + dentry = new; + } + } if (have_submounts(dentry)) - return 0; + valid = 0; + + if (new) + dput(new); + return valid; } return 1; |