diff options
| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-08-16 01:54:52 +0900 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-10-23 09:24:36 +0900 |
| commit | f11459ad7dab9e9eb5a05b8bd3bec338ea8f485d (patch) | |
| tree | 91808a1f88f6ad24f381473e1bde22f10cac49e6 /fs/nilfs2/the_nilfs.h | |
| parent | ab4d8f7ebf33beff97e766d18db47f1ea9635769 (diff) | |
nilfs2: do not allocate multiple super block instances for a device
This stops allocating multiple super block instances for a device.
All snapshots and a current mode mount (i.e. latest tree) will be
controlled with nilfs_root objects that are kept within an sb
instance.
nilfs_get_sb() is rewritten so that it always has a root object for
the latest tree and snapshots make additional root objects.
The root dentry of the latest tree is binded to sb->s_root even if it
isn't attached on a directory. Root dentries of snapshots or the
latest tree are binded to mnt->mnt_root on which they are mounted.
With this patch, nilfs_find_sbinfo() function, nilfs->ns_supers list,
and nilfs->ns_current back pointer, are deleted. In addition,
init_nilfs() and load_nilfs() are simplified since they will be called
once for a device, not repeatedly called for mount points.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/the_nilfs.h')
| -rw-r--r-- | fs/nilfs2/the_nilfs.h | 16 |
1 files changed, 0 insertions, 16 deletions
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h index 0afede68a9e1..7b43693a69c5 100644 --- a/fs/nilfs2/the_nilfs.h +++ b/fs/nilfs2/the_nilfs.h @@ -52,16 +52,13 @@ enum { * @ns_bdi: backing dev info * @ns_writer: back pointer to writable nilfs_sb_info * @ns_sem: semaphore for shared states - * @ns_super_sem: semaphore for global operations across super block instances * @ns_mount_mutex: mutex protecting mount process of nilfs * @ns_writer_sem: semaphore protecting ns_writer attach/detach - * @ns_current: back pointer to current mount * @ns_sbh: buffer heads of on-disk super blocks * @ns_sbp: pointers to super block data * @ns_sbwtime: previous write time of super block * @ns_sbwcount: write count of super block * @ns_sbsize: size of valid data in super block - * @ns_supers: list of nilfs super block structs * @ns_seg_seq: segment sequence counter * @ns_segnum: index number of the latest full segment. * @ns_nextnum: index number of the full segment index to be used next @@ -104,17 +101,10 @@ struct the_nilfs { struct backing_dev_info *ns_bdi; struct nilfs_sb_info *ns_writer; struct rw_semaphore ns_sem; - struct rw_semaphore ns_super_sem; struct mutex ns_mount_mutex; struct rw_semaphore ns_writer_sem; /* - * components protected by ns_super_sem - */ - struct nilfs_sb_info *ns_current; - struct list_head ns_supers; - - /* * used for * - loading the latest checkpoint exclusively. * - allocating a new full segment. @@ -294,12 +284,6 @@ nilfs_detach_writer(struct the_nilfs *nilfs, struct nilfs_sb_info *sbi) up_write(&nilfs->ns_writer_sem); } -static inline void nilfs_put_sbinfo(struct nilfs_sb_info *sbi) -{ - if (atomic_dec_and_test(&sbi->s_count)) - kfree(sbi); -} - static inline int nilfs_valid_fs(struct the_nilfs *nilfs) { unsigned valid_fs; |