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| author | Sage Weil <sage@newdream.net> | 2010-11-16 11:14:34 -0800 |
|---|---|---|
| committer | Sage Weil <sage@newdream.net> | 2011-01-12 15:15:12 -0800 |
| commit | 6c0f3af72cb1622a66962a1180c36ef8c41be8e2 (patch) | |
| tree | 66e415bf31ea31a3e9360c0ce624fd20b6050c89 /fs/ceph | |
| parent | 3c0eee3fe6a3a1c745379547c7e7c904aa64f6d5 (diff) | |
| download | linux-stable-6c0f3af72cb1622a66962a1180c36ef8c41be8e2.tar.gz linux-stable-6c0f3af72cb1622a66962a1180c36ef8c41be8e2.tar.bz2 linux-stable-6c0f3af72cb1622a66962a1180c36ef8c41be8e2.zip | |
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')
| -rw-r--r-- | fs/ceph/dir.c | 20 | ||||
| -rw-r--r-- | fs/ceph/export.c | 2 | ||||
| -rw-r--r-- | fs/ceph/inode.c | 2 | ||||
| -rw-r--r-- | fs/ceph/super.h | 2 |
4 files changed, 25 insertions, 1 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, diff --git a/fs/ceph/export.c b/fs/ceph/export.c index 2297d9426992..e41056174bf8 100644 --- a/fs/ceph/export.c +++ b/fs/ceph/export.c @@ -59,7 +59,7 @@ static int ceph_encode_fh(struct dentry *dentry, u32 *rawfh, int *max_len, dout("encode_fh %p connectable\n", dentry); cfh->ino = ceph_ino(dentry->d_inode); cfh->parent_ino = ceph_ino(parent->d_inode); - cfh->parent_name_hash = parent->d_name.hash; + cfh->parent_name_hash = ceph_dentry_hash(parent); *max_len = connected_handle_length; type = 2; } else if (*max_len >= handle_length) { diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c index bf1286588f26..045283ce4413 100644 --- a/fs/ceph/inode.c +++ b/fs/ceph/inode.c @@ -297,6 +297,8 @@ struct inode *ceph_alloc_inode(struct super_block *sb) ci->i_release_count = 0; ci->i_symlink = NULL; + memset(&ci->i_dir_layout, 0, sizeof(ci->i_dir_layout)); + ci->i_fragtree = RB_ROOT; mutex_init(&ci->i_fragtree_mutex); diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 7f01728a4657..6e0826695112 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -239,6 +239,7 @@ struct ceph_inode_info { unsigned i_ceph_flags; unsigned long i_release_count; + struct ceph_dir_layout i_dir_layout; struct ceph_file_layout i_layout; char *i_symlink; @@ -768,6 +769,7 @@ extern void ceph_dentry_lru_add(struct dentry *dn); extern void ceph_dentry_lru_touch(struct dentry *dn); extern void ceph_dentry_lru_del(struct dentry *dn); extern void ceph_invalidate_dentry_lease(struct dentry *dentry); +extern unsigned ceph_dentry_hash(struct dentry *dn); /* * our d_ops vary depending on whether the inode is live, |