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author | Yan, Zheng <zyan@redhat.com> | 2015-06-16 12:48:56 (GMT) |
---|---|---|
committer | Ilya Dryomov <idryomov@gmail.com> | 2015-06-25 08:49:32 (GMT) |
commit | fdd4e15838e59c394a1ec4963b57c22c12608685 (patch) | |
tree | b5486f7b0f12abf9ed670d187f4841dfdb2aa13e /fs/ceph/super.h | |
parent | b459be739f97e2062b2ba77cfe8ea198dbd58904 (diff) | |
download | linux-fdd4e15838e59c394a1ec4963b57c22c12608685.tar.xz |
ceph: rework dcache readdir
Previously our dcache readdir code relies on that child dentries in
directory dentry's d_subdir list are sorted by dentry's offset in
descending order. When adding dentries to the dcache, if a dentry
already exists, our readdir code moves it to head of directory
dentry's d_subdir list. This design relies on dcache internals.
Al Viro suggests using ncpfs's approach: keeping array of pointers
to dentries in page cache of directory inode. the validity of those
pointers are presented by directory inode's complete and ordered
flags. When a dentry gets pruned, we clear directory inode's complete
flag in the d_prune() callback. Before moving a dentry to other
directory, we clear the ordered flag for both old and new directory.
Signed-off-by: Yan, Zheng <zyan@redhat.com>
Diffstat (limited to 'fs/ceph/super.h')
-rw-r--r-- | fs/ceph/super.h | 60 |
1 files changed, 32 insertions, 28 deletions
diff --git a/fs/ceph/super.h b/fs/ceph/super.h index 4415e97..860cc016 100644 --- a/fs/ceph/super.h +++ b/fs/ceph/super.h @@ -282,9 +282,9 @@ struct ceph_inode_info { u32 i_time_warp_seq; unsigned i_ceph_flags; - int i_ordered_count; - atomic_t i_release_count; - atomic_t i_complete_count; + atomic64_t i_release_count; + atomic64_t i_ordered_count; + atomic64_t i_complete_seq[2]; struct ceph_dir_layout i_dir_layout; struct ceph_file_layout i_layout; @@ -471,30 +471,36 @@ static inline struct inode *ceph_find_inode(struct super_block *sb, static inline void __ceph_dir_set_complete(struct ceph_inode_info *ci, - int release_count, int ordered_count) + long long release_count, + long long ordered_count) { - atomic_set(&ci->i_complete_count, release_count); - if (ci->i_ordered_count == ordered_count) - ci->i_ceph_flags |= CEPH_I_DIR_ORDERED; - else - ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED; + smp_mb__before_atomic(); + atomic64_set(&ci->i_complete_seq[0], release_count); + atomic64_set(&ci->i_complete_seq[1], ordered_count); } static inline void __ceph_dir_clear_complete(struct ceph_inode_info *ci) { - atomic_inc(&ci->i_release_count); + atomic64_inc(&ci->i_release_count); +} + +static inline void __ceph_dir_clear_ordered(struct ceph_inode_info *ci) +{ + atomic64_inc(&ci->i_ordered_count); } static inline bool __ceph_dir_is_complete(struct ceph_inode_info *ci) { - return atomic_read(&ci->i_complete_count) == - atomic_read(&ci->i_release_count); + return atomic64_read(&ci->i_complete_seq[0]) == + atomic64_read(&ci->i_release_count); } static inline bool __ceph_dir_is_complete_ordered(struct ceph_inode_info *ci) { - return __ceph_dir_is_complete(ci) && - (ci->i_ceph_flags & CEPH_I_DIR_ORDERED); + return atomic64_read(&ci->i_complete_seq[0]) == + atomic64_read(&ci->i_release_count) && + atomic64_read(&ci->i_complete_seq[1]) == + atomic64_read(&ci->i_ordered_count); } static inline void ceph_dir_clear_complete(struct inode *inode) @@ -504,20 +510,13 @@ static inline void ceph_dir_clear_complete(struct inode *inode) static inline void ceph_dir_clear_ordered(struct inode *inode) { - struct ceph_inode_info *ci = ceph_inode(inode); - spin_lock(&ci->i_ceph_lock); - ci->i_ordered_count++; - ci->i_ceph_flags &= ~CEPH_I_DIR_ORDERED; - spin_unlock(&ci->i_ceph_lock); + __ceph_dir_clear_ordered(ceph_inode(inode)); } static inline bool ceph_dir_is_complete_ordered(struct inode *inode) { - struct ceph_inode_info *ci = ceph_inode(inode); - bool ret; - spin_lock(&ci->i_ceph_lock); - ret = __ceph_dir_is_complete_ordered(ci); - spin_unlock(&ci->i_ceph_lock); + bool ret = __ceph_dir_is_complete_ordered(ceph_inode(inode)); + smp_rmb(); return ret; } @@ -636,16 +635,20 @@ struct ceph_file_info { unsigned offset; /* offset of last chunk, adjusted for . and .. */ unsigned next_offset; /* offset of next chunk (last_name's + 1) */ char *last_name; /* last entry in previous chunk */ - struct dentry *dentry; /* next dentry (for dcache readdir) */ - int dir_release_count; - int dir_ordered_count; + long long dir_release_count; + long long dir_ordered_count; + int readdir_cache_idx; /* used for -o dirstat read() on directory thing */ char *dir_info; int dir_info_len; }; - +struct ceph_readdir_cache_control { + struct page *page; + struct dentry **dentries; + int index; +}; /* * A "snap realm" describes a subset of the file hierarchy sharing @@ -944,6 +947,7 @@ extern void ceph_dentry_lru_del(struct dentry *dn); extern void ceph_invalidate_dentry_lease(struct dentry *dentry); extern unsigned ceph_dentry_hash(struct inode *dir, struct dentry *dn); extern struct inode *ceph_get_dentry_parent_inode(struct dentry *dentry); +extern void ceph_readdir_cache_release(struct ceph_readdir_cache_control *ctl); /* * our d_ops vary depending on whether the inode is live, |