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author | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-16 16:32:04 +0900 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-06-16 16:32:04 +0900 |
commit | 35773c93817c5f2df264d013978e7551056a063a (patch) | |
tree | 5ca02a3f3c680091d5b1019b27ba23b5323a038a /fs/namei.c | |
parent | 29d6849d88b61edf130aef500acad78206bda3cd (diff) | |
parent | 47ea0f2ebffd400d36ab5946ec8d6d6e08a67d53 (diff) | |
download | op-kernel-dev-35773c93817c5f2df264d013978e7551056a063a.zip op-kernel-dev-35773c93817c5f2df264d013978e7551056a063a.tar.gz |
Merge branch 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull AFS updates from Al Viro:
"Assorted AFS stuff - ended up in vfs.git since most of that consists
of David's AFS-related followups to Christoph's procfs series"
* 'afs-proc' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
afs: Optimise callback breaking by not repeating volume lookup
afs: Display manually added cells in dynamic root mount
afs: Enable IPv6 DNS lookups
afs: Show all of a server's addresses in /proc/fs/afs/servers
afs: Handle CONFIG_PROC_FS=n
proc: Make inline name size calculation automatic
afs: Implement network namespacing
afs: Mark afs_net::ws_cell as __rcu and set using rcu functions
afs: Fix a Sparse warning in xdr_decode_AFSFetchStatus()
proc: Add a way to make network proc files writable
afs: Rearrange fs/afs/proc.c to remove remaining predeclarations.
afs: Rearrange fs/afs/proc.c to move the show routines up
afs: Rearrange fs/afs/proc.c by moving fops and open functions down
afs: Move /proc management functions to the end of the file
Diffstat (limited to 'fs/namei.c')
-rw-r--r-- | fs/namei.c | 29 |
1 files changed, 29 insertions, 0 deletions
@@ -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 |