diff options
Diffstat (limited to 'ANDROID_3.4.5/fs/nilfs2/the_nilfs.h')
| -rw-r--r-- | ANDROID_3.4.5/fs/nilfs2/the_nilfs.h | 356 |
1 files changed, 0 insertions, 356 deletions
diff --git a/ANDROID_3.4.5/fs/nilfs2/the_nilfs.h b/ANDROID_3.4.5/fs/nilfs2/the_nilfs.h deleted file mode 100644 index 9992b113..00000000 --- a/ANDROID_3.4.5/fs/nilfs2/the_nilfs.h +++ /dev/null @@ -1,356 +0,0 @@ -/* - * the_nilfs.h - the_nilfs shared structure. - * - * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA - * - * Written by Ryusuke Konishi <ryusuke@osrg.net> - * - */ - -#ifndef _THE_NILFS_H -#define _THE_NILFS_H - -#include <linux/types.h> -#include <linux/buffer_head.h> -#include <linux/rbtree.h> -#include <linux/fs.h> -#include <linux/blkdev.h> -#include <linux/backing-dev.h> -#include <linux/slab.h> - -struct nilfs_sc_info; - -/* the_nilfs struct */ -enum { - THE_NILFS_INIT = 0, /* Information from super_block is set */ - THE_NILFS_DISCONTINUED, /* 'next' pointer chain has broken */ - THE_NILFS_GC_RUNNING, /* gc process is running */ - THE_NILFS_SB_DIRTY, /* super block is dirty */ -}; - -/** - * struct the_nilfs - struct to supervise multiple nilfs mount points - * @ns_flags: flags - * @ns_bdev: block device - * @ns_sem: semaphore for shared states - * @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_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 - * @ns_pseg_offset: offset of next partial segment in the current full segment - * @ns_cno: next checkpoint number - * @ns_ctime: write time of the last segment - * @ns_nongc_ctime: write time of the last segment not for cleaner operation - * @ns_ndirtyblks: Number of dirty data blocks - * @ns_last_segment_lock: lock protecting fields for the latest segment - * @ns_last_pseg: start block number of the latest segment - * @ns_last_seq: sequence value of the latest segment - * @ns_last_cno: checkpoint number of the latest segment - * @ns_prot_seq: least sequence number of segments which must not be reclaimed - * @ns_prev_seq: base sequence number used to decide if advance log cursor - * @ns_writer: log writer - * @ns_segctor_sem: semaphore protecting log write - * @ns_dat: DAT file inode - * @ns_cpfile: checkpoint file inode - * @ns_sufile: segusage file inode - * @ns_cptree: rb-tree of all mounted checkpoints (nilfs_root) - * @ns_cptree_lock: lock protecting @ns_cptree - * @ns_dirty_files: list of dirty files - * @ns_inode_lock: lock protecting @ns_dirty_files - * @ns_gc_inodes: dummy inodes to keep live blocks - * @ns_next_generation: next generation number for inodes - * @ns_next_gen_lock: lock protecting @ns_next_generation - * @ns_mount_opt: mount options - * @ns_resuid: uid for reserved blocks - * @ns_resgid: gid for reserved blocks - * @ns_interval: checkpoint creation interval - * @ns_watermark: watermark for the number of dirty buffers - * @ns_blocksize_bits: bit length of block size - * @ns_blocksize: block size - * @ns_nsegments: number of segments in filesystem - * @ns_blocks_per_segment: number of blocks per segment - * @ns_r_segments_percentage: reserved segments percentage - * @ns_nrsvsegs: number of reserved segments - * @ns_first_data_block: block number of first data block - * @ns_inode_size: size of on-disk inode - * @ns_first_ino: first not-special inode number - * @ns_crc_seed: seed value of CRC32 calculation - */ -struct the_nilfs { - unsigned long ns_flags; - - struct block_device *ns_bdev; - struct rw_semaphore ns_sem; - - /* - * used for - * - loading the latest checkpoint exclusively. - * - allocating a new full segment. - * - protecting s_dirt in the super_block struct - * (see nilfs_write_super) and the following fields. - */ - struct buffer_head *ns_sbh[2]; - struct nilfs_super_block *ns_sbp[2]; - time_t ns_sbwtime; - unsigned ns_sbwcount; - unsigned ns_sbsize; - unsigned ns_mount_state; - - /* - * Following fields are dedicated to a writable FS-instance. - * Except for the period seeking checkpoint, code outside the segment - * constructor must lock a segment semaphore while accessing these - * fields. - * The writable FS-instance is sole during a lifetime of the_nilfs. - */ - u64 ns_seg_seq; - __u64 ns_segnum; - __u64 ns_nextnum; - unsigned long ns_pseg_offset; - __u64 ns_cno; - time_t ns_ctime; - time_t ns_nongc_ctime; - atomic_t ns_ndirtyblks; - - /* - * The following fields hold information on the latest partial segment - * written to disk with a super root. These fields are protected by - * ns_last_segment_lock. - */ - spinlock_t ns_last_segment_lock; - sector_t ns_last_pseg; - u64 ns_last_seq; - __u64 ns_last_cno; - u64 ns_prot_seq; - u64 ns_prev_seq; - - struct nilfs_sc_info *ns_writer; - struct rw_semaphore ns_segctor_sem; - - /* - * Following fields are lock free except for the period before - * the_nilfs is initialized. - */ - struct inode *ns_dat; - struct inode *ns_cpfile; - struct inode *ns_sufile; - - /* Checkpoint tree */ - struct rb_root ns_cptree; - spinlock_t ns_cptree_lock; - - /* Dirty inode list */ - struct list_head ns_dirty_files; - spinlock_t ns_inode_lock; - - /* GC inode list */ - struct list_head ns_gc_inodes; - - /* Inode allocator */ - u32 ns_next_generation; - spinlock_t ns_next_gen_lock; - - /* Mount options */ - unsigned long ns_mount_opt; - - uid_t ns_resuid; - gid_t ns_resgid; - unsigned long ns_interval; - unsigned long ns_watermark; - - /* Disk layout information (static) */ - unsigned int ns_blocksize_bits; - unsigned int ns_blocksize; - unsigned long ns_nsegments; - unsigned long ns_blocks_per_segment; - unsigned long ns_r_segments_percentage; - unsigned long ns_nrsvsegs; - unsigned long ns_first_data_block; - int ns_inode_size; - int ns_first_ino; - u32 ns_crc_seed; -}; - -#define THE_NILFS_FNS(bit, name) \ -static inline void set_nilfs_##name(struct the_nilfs *nilfs) \ -{ \ - set_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \ -} \ -static inline void clear_nilfs_##name(struct the_nilfs *nilfs) \ -{ \ - clear_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \ -} \ -static inline int nilfs_##name(struct the_nilfs *nilfs) \ -{ \ - return test_bit(THE_NILFS_##bit, &(nilfs)->ns_flags); \ -} - -THE_NILFS_FNS(INIT, init) -THE_NILFS_FNS(DISCONTINUED, discontinued) -THE_NILFS_FNS(GC_RUNNING, gc_running) -THE_NILFS_FNS(SB_DIRTY, sb_dirty) - -/* - * Mount option operations - */ -#define nilfs_clear_opt(nilfs, opt) \ - do { (nilfs)->ns_mount_opt &= ~NILFS_MOUNT_##opt; } while (0) -#define nilfs_set_opt(nilfs, opt) \ - do { (nilfs)->ns_mount_opt |= NILFS_MOUNT_##opt; } while (0) -#define nilfs_test_opt(nilfs, opt) ((nilfs)->ns_mount_opt & NILFS_MOUNT_##opt) -#define nilfs_write_opt(nilfs, mask, opt) \ - do { (nilfs)->ns_mount_opt = \ - (((nilfs)->ns_mount_opt & ~NILFS_MOUNT_##mask) | \ - NILFS_MOUNT_##opt); \ - } while (0) - -/** - * struct nilfs_root - nilfs root object - * @cno: checkpoint number - * @rb_node: red-black tree node - * @count: refcount of this structure - * @nilfs: nilfs object - * @ifile: inode file - * @root: root inode - * @inodes_count: number of inodes - * @blocks_count: number of blocks (Reserved) - */ -struct nilfs_root { - __u64 cno; - struct rb_node rb_node; - - atomic_t count; - struct the_nilfs *nilfs; - struct inode *ifile; - - atomic_t inodes_count; - atomic_t blocks_count; -}; - -/* Special checkpoint number */ -#define NILFS_CPTREE_CURRENT_CNO 0 - -/* Minimum interval of periodical update of superblocks (in seconds) */ -#define NILFS_SB_FREQ 10 - -static inline int nilfs_sb_need_update(struct the_nilfs *nilfs) -{ - u64 t = get_seconds(); - return t < nilfs->ns_sbwtime || t > nilfs->ns_sbwtime + NILFS_SB_FREQ; -} - -static inline int nilfs_sb_will_flip(struct the_nilfs *nilfs) -{ - int flip_bits = nilfs->ns_sbwcount & 0x0FL; - return (flip_bits != 0x08 && flip_bits != 0x0F); -} - -void nilfs_set_last_segment(struct the_nilfs *, sector_t, u64, __u64); -struct the_nilfs *alloc_nilfs(struct block_device *bdev); -void destroy_nilfs(struct the_nilfs *nilfs); -int init_nilfs(struct the_nilfs *nilfs, struct super_block *sb, char *data); -int load_nilfs(struct the_nilfs *nilfs, struct super_block *sb); -unsigned long nilfs_nrsvsegs(struct the_nilfs *nilfs, unsigned long nsegs); -void nilfs_set_nsegments(struct the_nilfs *nilfs, unsigned long nsegs); -int nilfs_discard_segments(struct the_nilfs *, __u64 *, size_t); -int nilfs_count_free_blocks(struct the_nilfs *, sector_t *); -struct nilfs_root *nilfs_lookup_root(struct the_nilfs *nilfs, __u64 cno); -struct nilfs_root *nilfs_find_or_create_root(struct the_nilfs *nilfs, - __u64 cno); -void nilfs_put_root(struct nilfs_root *root); -int nilfs_near_disk_full(struct the_nilfs *); -void nilfs_fall_back_super_block(struct the_nilfs *); -void nilfs_swap_super_block(struct the_nilfs *); - - -static inline void nilfs_get_root(struct nilfs_root *root) -{ - atomic_inc(&root->count); -} - -static inline int nilfs_valid_fs(struct the_nilfs *nilfs) -{ - unsigned valid_fs; - - down_read(&nilfs->ns_sem); - valid_fs = (nilfs->ns_mount_state & NILFS_VALID_FS); - up_read(&nilfs->ns_sem); - return valid_fs; -} - -static inline void -nilfs_get_segment_range(struct the_nilfs *nilfs, __u64 segnum, - sector_t *seg_start, sector_t *seg_end) -{ - *seg_start = (sector_t)nilfs->ns_blocks_per_segment * segnum; - *seg_end = *seg_start + nilfs->ns_blocks_per_segment - 1; - if (segnum == 0) - *seg_start = nilfs->ns_first_data_block; -} - -static inline sector_t -nilfs_get_segment_start_blocknr(struct the_nilfs *nilfs, __u64 segnum) -{ - return (segnum == 0) ? nilfs->ns_first_data_block : - (sector_t)nilfs->ns_blocks_per_segment * segnum; -} - -static inline __u64 -nilfs_get_segnum_of_block(struct the_nilfs *nilfs, sector_t blocknr) -{ - sector_t segnum = blocknr; - - sector_div(segnum, nilfs->ns_blocks_per_segment); - return segnum; -} - -static inline void -nilfs_terminate_segment(struct the_nilfs *nilfs, sector_t seg_start, - sector_t seg_end) -{ - /* terminate the current full segment (used in case of I/O-error) */ - nilfs->ns_pseg_offset = seg_end - seg_start + 1; -} - -static inline void nilfs_shift_to_next_segment(struct the_nilfs *nilfs) -{ - /* move forward with a full segment */ - nilfs->ns_segnum = nilfs->ns_nextnum; - nilfs->ns_pseg_offset = 0; - nilfs->ns_seg_seq++; -} - -static inline __u64 nilfs_last_cno(struct the_nilfs *nilfs) -{ - __u64 cno; - - spin_lock(&nilfs->ns_last_segment_lock); - cno = nilfs->ns_last_cno; - spin_unlock(&nilfs->ns_last_segment_lock); - return cno; -} - -static inline int nilfs_segment_is_active(struct the_nilfs *nilfs, __u64 n) -{ - return n == nilfs->ns_segnum || n == nilfs->ns_nextnum; -} - -#endif /* _THE_NILFS_H */ |