diff options
| author | Yan, Zheng <zyan@redhat.com> | 2016-04-29 11:27:30 +0800 |
|---|---|---|
| committer | Ilya Dryomov <idryomov@gmail.com> | 2016-05-26 01:15:36 +0200 |
| commit | f3c4ebe65ea149ec892f94474233cfebe9cbe299 (patch) | |
| tree | 4a6aa1280fa6160d55935577792cd5d46e18f665 /fs/ceph/super.h | |
| parent | 076c40f18d10489e29c515bf5936952830df5e16 (diff) | |
ceph: using hash value to compose dentry offset
If MDS sorts dentries in dirfrag in hash order, we use hash value to
compose dentry offset. dentry offset is:
(0xff << 52) | ((24 bits hash) << 28) |
(the nth entry hash hash collision)
This offset is stable across directory fragmentation. This alos means
there is no need to reset readdir offset if directory get fragmented
in the middle of readdir.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph/super.h')
| -rw-r--r-- | fs/ceph/super.h | 6 |
1 files changed, 1 insertions, 5 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 0628099ba1f2..c9b671dfff81 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -540,11 +540,6 @@ static inline struct ceph_dentry_info *ceph_dentry(struct dentry *dentry) return (struct ceph_dentry_info *)dentry->d_fsdata; } -static inline loff_t ceph_make_fpos(unsigned frag, unsigned off) -{ - return ((loff_t)frag << 32) | (loff_t)off; -} - /* * caps helpers */ @@ -949,6 +944,7 @@ extern const struct inode_operations ceph_snapdir_iops; extern const struct dentry_operations ceph_dentry_ops, ceph_snap_dentry_ops, ceph_snapdir_dentry_ops; +extern loff_t ceph_make_fpos(unsigned high, unsigned off, bool hash_order); extern int ceph_handle_notrace_create(struct inode *dir, struct dentry *dentry); extern int ceph_handle_snapdir(struct ceph_mds_request *req, struct dentry *dentry, int err); |