diff options
Diffstat (limited to 'fs/namei.c')
| -rw-r--r-- | fs/namei.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/namei.c b/fs/namei.c index 186bd2464fd5..2e0a1c5729f1 100644 --- a/fs/namei.c +++ b/fs/namei.c @@ -2464,6 +2464,35 @@ static int lookup_one_len_common(const char *name, struct dentry *base, } /** + * try_lookup_one_len - filesystem helper to lookup single pathname component + * @name: pathname component to lookup + * @base: base directory to lookup from + * @len: maximum length @len should be interpreted to + * + * Look up a dentry by name in the dcache, returning NULL if it does not + * currently exist. The function does not try to create a dentry. + * + * Note that this routine is purely a helper for filesystem usage and should + * not be called by generic code. + * + * The caller must hold base->i_mutex. + */ +struct dentry *try_lookup_one_len(const char *name, struct dentry *base, int len) +{ + struct qstr this; + int err; + + WARN_ON_ONCE(!inode_is_locked(base->d_inode)); + + err = lookup_one_len_common(name, base, len, &this); + if (err) + return ERR_PTR(err); + + return lookup_dcache(&this, base, 0); +} +EXPORT_SYMBOL(try_lookup_one_len); + +/** * lookup_one_len - filesystem helper to lookup single pathname component * @name: pathname component to lookup * @base: base directory to lookup from |