diff options
Diffstat (limited to 'fs/libfs.c')
| -rw-r--r-- | fs/libfs.c | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/fs/libfs.c b/fs/libfs.c index 4d5422298183..89e47af931f1 100644 --- a/fs/libfs.c +++ b/fs/libfs.c @@ -2272,3 +2272,28 @@ void stashed_dentry_prune(struct dentry *dentry) */ cmpxchg(stashed, dentry, NULL); } + +/* parent must be held exclusive */ +struct dentry *simple_start_creating(struct dentry *parent, const char *name) +{ + struct dentry *dentry; + struct inode *dir = d_inode(parent); + + inode_lock(dir); + if (unlikely(IS_DEADDIR(dir))) { + inode_unlock(dir); + return ERR_PTR(-ENOENT); + } + dentry = lookup_noperm(&QSTR(name), parent); + if (IS_ERR(dentry)) { + inode_unlock(dir); + return dentry; + } + if (dentry->d_inode) { + dput(dentry); + inode_unlock(dir); + return ERR_PTR(-EEXIST); + } + return dentry; +} +EXPORT_SYMBOL(simple_start_creating); |