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| author | Sage Weil <sage@newdream.net> | 2010-11-16 22:14:34 +0300 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2011-01-13 02:15:12 +0300 |
| commit | 6c0f3af72cb1622a66962a1180c36ef8c41be8e2 (patch) | |
| tree | 66e415bf31ea31a3e9360c0ce624fd20b6050c89 /fs/ceph/dir.c | |
| parent | 3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5 (diff) | |
| download | linux-6c0f3af72cb1622a66962a1180c36ef8c41be8e2.tar.xz | |
ceph: add dir_layout to inode
Add a ceph_dir_layout to the inode, and calculate dentry hash values based
on the parent directory's specified dir_hash function. This is needed
because the old default Linux dcache hash function is extremely week and
leads to a poor distribution of files among dir fragments.
Signed-off-by: Sage Weil <sage@newdream.net>
Diffstat (limited to 'fs/ceph/dir.c')
| -rw-r--r-- | fs/ceph/dir.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/ceph/dir.c b/fs/ceph/dir.c index d902948a90d8..562f9884a4d9 100644 --- a/fs/ceph/dir.c +++ b/fs/ceph/dir.c @@ -1216,6 +1216,26 @@ void ceph_dentry_lru_del(struct dentry *dn) } } +/* + * Return name hash for a given dentry. This is dependent on + * the parent directory's hash function. + */ +unsigned ceph_dentry_hash(struct dentry *dn) +{ + struct inode *dir = dn->d_parent->d_inode; + struct ceph_inode_info *dci = ceph_inode(dir); + + switch (dci->i_dir_layout.dl_dir_hash) { + case 0: /* for backward compat */ + case CEPH_STR_HASH_LINUX: + return dn->d_name.hash; + + default: + return ceph_str_hash(dci->i_dir_layout.dl_dir_hash, + dn->d_name.name, dn->d_name.len); + } +} + const struct file_operations ceph_dir_fops = { .read = ceph_read_dir, .readdir = ceph_readdir, |