diff options
Diffstat (limited to 'fs/nilfs2/segbuf.h')
| -rw-r--r-- | fs/nilfs2/segbuf.h | 87 |
1 files changed, 35 insertions, 52 deletions
diff --git a/fs/nilfs2/segbuf.h b/fs/nilfs2/segbuf.h index 0c3076f4e59..b04f08cc239 100644 --- a/fs/nilfs2/segbuf.h +++ b/fs/nilfs2/segbuf.h @@ -27,7 +27,6 @@ #include <linux/buffer_head.h> #include <linux/bio.h> #include <linux/completion.h> -#include <linux/backing-dev.h> /** * struct nilfs_segsum_info - On-memory segment summary @@ -38,6 +37,7 @@ * @sumbytes: Byte count of segment summary * @nfileblk: Total number of file blocks * @seg_seq: Segment sequence number + * @cno: Checkpoint number * @ctime: Creation time * @next: Block number of the next full segment */ @@ -49,21 +49,11 @@ struct nilfs_segsum_info { unsigned long sumbytes; unsigned long nfileblk; u64 seg_seq; + __u64 cno; time_t ctime; sector_t next; }; -/* macro for the flags */ -#define NILFS_SEG_HAS_SR(sum) ((sum)->flags & NILFS_SS_SR) -#define NILFS_SEG_LOGBGN(sum) ((sum)->flags & NILFS_SS_LOGBGN) -#define NILFS_SEG_LOGEND(sum) ((sum)->flags & NILFS_SS_LOGEND) -#define NILFS_SEG_DSYNC(sum) ((sum)->flags & NILFS_SS_SYNDT) -#define NILFS_SEG_SIMPLEX(sum) \ - (((sum)->flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == \ - (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) - -#define NILFS_SEG_EMPTY(sum) ((sum)->nblocks == (sum)->nsumblk) - /** * struct nilfs_segment_buffer - Segment buffer * @sb_super: back pointer to a superblock struct @@ -77,7 +67,10 @@ struct nilfs_segsum_info { * @sb_rest_blocks: Number of residual blocks in the current segment * @sb_segsum_buffers: List of buffers for segment summaries * @sb_payload_buffers: List of buffers for segment payload - * @sb_io_error: I/O error status + * @sb_super_root: Pointer to buffer storing a super root block (if exists) + * @sb_nbio: Number of flying bio requests + * @sb_err: I/O error status + * @sb_bio_event: Completion event of log writing */ struct nilfs_segment_buffer { struct super_block *sb_super; @@ -94,9 +87,12 @@ struct nilfs_segment_buffer { /* Buffers */ struct list_head sb_segsum_buffers; struct list_head sb_payload_buffers; /* including super root */ + struct buffer_head *sb_super_root; /* io status */ - int sb_io_error; + int sb_nbio; + atomic_t sb_err; + struct completion sb_bio_event; }; #define NILFS_LIST_SEGBUF(head) \ @@ -118,22 +114,34 @@ struct nilfs_segment_buffer { b_assoc_buffers)) #define NILFS_SEGBUF_BH_IS_LAST(bh, head) ((bh)->b_assoc_buffers.next == head) +extern struct kmem_cache *nilfs_segbuf_cachep; -int __init nilfs_init_segbuf_cache(void); -void nilfs_destroy_segbuf_cache(void); struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *); void nilfs_segbuf_free(struct nilfs_segment_buffer *); void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long, struct the_nilfs *); +void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf, + struct nilfs_segment_buffer *prev); void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64, struct the_nilfs *); -int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t); +int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t, __u64); int nilfs_segbuf_extend_segsum(struct nilfs_segment_buffer *); int nilfs_segbuf_extend_payload(struct nilfs_segment_buffer *, struct buffer_head **); void nilfs_segbuf_fill_in_segsum(struct nilfs_segment_buffer *); -void nilfs_segbuf_fill_in_segsum_crc(struct nilfs_segment_buffer *, u32); -void nilfs_segbuf_fill_in_data_crc(struct nilfs_segment_buffer *, u32); + +static inline int nilfs_segbuf_simplex(struct nilfs_segment_buffer *segbuf) +{ + unsigned int flags = segbuf->sb_sum.flags; + + return (flags & (NILFS_SS_LOGBGN | NILFS_SS_LOGEND)) == + (NILFS_SS_LOGBGN | NILFS_SS_LOGEND); +} + +static inline int nilfs_segbuf_empty(struct nilfs_segment_buffer *segbuf) +{ + return segbuf->sb_sum.nblocks == segbuf->sb_sum.nsumblk; +} static inline void nilfs_segbuf_add_segsum_buffer(struct nilfs_segment_buffer *segbuf, @@ -161,41 +169,16 @@ nilfs_segbuf_add_file_buffer(struct nilfs_segment_buffer *segbuf, segbuf->sb_sum.nfileblk++; } -void nilfs_release_buffers(struct list_head *); +void nilfs_clear_logs(struct list_head *logs); +void nilfs_truncate_logs(struct list_head *logs, + struct nilfs_segment_buffer *last); +int nilfs_write_logs(struct list_head *logs, struct the_nilfs *nilfs); +int nilfs_wait_on_logs(struct list_head *logs); +void nilfs_add_checksums_on_logs(struct list_head *logs, u32 seed); -static inline void nilfs_segbuf_clear(struct nilfs_segment_buffer *segbuf) +static inline void nilfs_destroy_logs(struct list_head *logs) { - nilfs_release_buffers(&segbuf->sb_segsum_buffers); - nilfs_release_buffers(&segbuf->sb_payload_buffers); + nilfs_truncate_logs(logs, NULL); } -struct nilfs_write_info { - struct bio *bio; - int start, end; /* The region to be submitted */ - int rest_blocks; - int max_pages; - int nr_vecs; - sector_t blocknr; - - int nbio; - atomic_t err; - struct completion bio_event; - /* completion event of segment write */ - - /* - * The following fields must be set explicitly - */ - struct super_block *sb; - struct backing_dev_info *bdi; /* backing dev info */ - struct buffer_head *bh_sr; -}; - - -void nilfs_segbuf_prepare_write(struct nilfs_segment_buffer *, - struct nilfs_write_info *); -int nilfs_segbuf_write(struct nilfs_segment_buffer *, - struct nilfs_write_info *); -int nilfs_segbuf_wait(struct nilfs_segment_buffer *, - struct nilfs_write_info *); - #endif /* _NILFS_SEGBUF_H */ |