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ceph: add dir_layout to inode

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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>
This commit is contained in:
Sage Weil
2010-11-16 11:14:34 -08:00
parent 3c0eee3fe6
commit 6c0f3af72c
6 changed files with 41 additions and 4 deletions
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2
fs/ceph/super.h
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@@ -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,