diff options
author | Eric W. Biederman <ebiederm@xmission.com> | 2006-03-31 10:31:43 (GMT) |
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committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-03-31 20:19:00 (GMT) |
commit | 3e7e241f8c5c87cc3685364feface081c9fa3648 (patch) | |
tree | 43ea46cfec4da31a505e93875feeac945bf906ce /fs | |
parent | 92476d7fc0326a409ab1d3864a04093a6be9aca7 (diff) | |
download | linux-3e7e241f8c5c87cc3685364feface081c9fa3648.tar.xz |
[PATCH] dcache: Add helper d_hash_and_lookup
It is very common to hash a dentry and then to call lookup. If we take fs
specific hash functions into account the full hash logic can get ugly.
Further full_name_hash as an inline function is almost 100 bytes on x86 so
having a non-inline choice in some cases can measurably decrease code size.
Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/dcache.c | 44 |
1 files changed, 28 insertions, 16 deletions
diff --git a/fs/dcache.c b/fs/dcache.c index 21dffee..940d188 100644 --- a/fs/dcache.c +++ b/fs/dcache.c @@ -1101,6 +1101,32 @@ next: } /** + * d_hash_and_lookup - hash the qstr then search for a dentry + * @dir: Directory to search in + * @name: qstr of name we wish to find + * + * On hash failure or on lookup failure NULL is returned. + */ +struct dentry *d_hash_and_lookup(struct dentry *dir, struct qstr *name) +{ + struct dentry *dentry = NULL; + + /* + * Check for a fs-specific hash function. Note that we must + * calculate the standard hash first, as the d_op->d_hash() + * routine may choose to leave the hash value unchanged. + */ + name->hash = full_name_hash(name->name, name->len); + if (dir->d_op && dir->d_op->d_hash) { + if (dir->d_op->d_hash(dir, name) < 0) + goto out; + } + dentry = d_lookup(dir, name); +out: + return dentry; +} + +/** * d_validate - verify dentry provided from insecure source * @dentry: The dentry alleged to be valid child of @dparent * @dparent: The parent dentry (known to be valid) @@ -1616,26 +1642,12 @@ ino_t find_inode_number(struct dentry *dir, struct qstr *name) struct dentry * dentry; ino_t ino = 0; - /* - * Check for a fs-specific hash function. Note that we must - * calculate the standard hash first, as the d_op->d_hash() - * routine may choose to leave the hash value unchanged. - */ - name->hash = full_name_hash(name->name, name->len); - if (dir->d_op && dir->d_op->d_hash) - { - if (dir->d_op->d_hash(dir, name) != 0) - goto out; - } - - dentry = d_lookup(dir, name); - if (dentry) - { + dentry = d_hash_and_lookup(dir, name); + if (dentry) { if (dentry->d_inode) ino = dentry->d_inode->i_ino; dput(dentry); } -out: return ino; } |