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nilfs2: move routine to set segment usage into sufile 

This adds nilfs_sufile_set_segment_usage() function in sufile to
replace direct access to the sufile metadata in log writer code.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2009-11-18 18:23:34 +09:00
parent 61a189e9c6
commit 071ec54dd7
3 changed files with 49 additions and 22 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

32
fs/nilfs2/segment.c
View File

@ -1457,21 +1457,16 @@ static void nilfs_segctor_update_segusage(struct nilfs_sc_info *sci,
struct inode *sufile)
{
struct nilfs_segment_buffer *segbuf;
struct buffer_head *bh_su;
struct nilfs_segment_usage *raw_su;
unsigned long live_blocks;
int ret;
list_for_each_entry(segbuf, &sci->sc_segbufs, sb_list) {
ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
&raw_su, &bh_su);
WARN_ON(ret); /* always succeed because bh_su is dirty */
live_blocks = segbuf->sb_sum.nblocks +
(segbuf->sb_pseg_start - segbuf->sb_fseg_start);
raw_su->su_lastmod = cpu_to_le64(sci->sc_seg_ctime);
raw_su->su_nblocks = cpu_to_le32(live_blocks);
nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
bh_su);
ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
live_blocks,
sci->sc_seg_ctime);
WARN_ON(ret); /* always succeed because the segusage is dirty */
}
}
@ -1479,25 +1474,18 @@ static void nilfs_segctor_cancel_segusage(struct nilfs_sc_info *sci,
struct inode *sufile)
{
struct nilfs_segment_buffer *segbuf;
struct buffer_head *bh_su;
struct nilfs_segment_usage *raw_su;
int ret;
segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
&raw_su, &bh_su);
WARN_ON(ret); /* always succeed because bh_su is dirty */
raw_su->su_nblocks = cpu_to_le32(segbuf->sb_pseg_start -
segbuf->sb_fseg_start);
nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum, bh_su);
ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
segbuf->sb_pseg_start -
segbuf->sb_fseg_start, 0);
WARN_ON(ret); /* always succeed because the segusage is dirty */
list_for_each_entry_continue(segbuf, &sci->sc_segbufs, sb_list) {
ret = nilfs_sufile_get_segment_usage(sufile, segbuf->sb_segnum,
&raw_su, &bh_su);
ret = nilfs_sufile_set_segment_usage(sufile, segbuf->sb_segnum,
0, 0);
WARN_ON(ret); /* always succeed */
raw_su->su_nblocks = 0;
nilfs_sufile_put_segment_usage(sufile, segbuf->sb_segnum,
bh_su);
}
}

37
fs/nilfs2/sufile.c
View File

@ -520,6 +520,43 @@ int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum)
return ret;
}
/**
* nilfs_sufile_set_segment_usage - set usage of a segment
* @sufile: inode of segment usage file
* @segnum: segment number
* @nblocks: number of live blocks in the segment
* @modtime: modification time (option)
*/
int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
unsigned long nblocks, time_t modtime)
{
struct buffer_head *bh;
struct nilfs_segment_usage *su;
void *kaddr;
int ret;
down_write(&NILFS_MDT(sufile)->mi_sem);
ret = nilfs_sufile_get_segment_usage_block(sufile, segnum, 0, &bh);
if (ret < 0)
goto out_sem;
kaddr = kmap_atomic(bh->b_page, KM_USER0);
su = nilfs_sufile_block_get_segment_usage(sufile, segnum, bh, kaddr);
WARN_ON(nilfs_segment_usage_error(su));
if (modtime)
su->su_lastmod = cpu_to_le64(modtime);
su->su_nblocks = cpu_to_le32(nblocks);
kunmap_atomic(kaddr, KM_USER0);
nilfs_mdt_mark_buffer_dirty(bh);
nilfs_mdt_mark_dirty(sufile);
brelse(bh);
out_sem:
up_write(&NILFS_MDT(sufile)->mi_sem);
return ret;
}
/**
* nilfs_sufile_get_stat - get segment usage statistics
* @sufile: inode of segment usage file

2
fs/nilfs2/sufile.h
View File

@ -43,6 +43,8 @@ int nilfs_sufile_get_segment_usage(struct inode *, __u64,
void nilfs_sufile_put_segment_usage(struct inode *, __u64,
struct buffer_head *);
int nilfs_sufile_mark_dirty(struct inode *sufile, __u64 segnum);
int nilfs_sufile_set_segment_usage(struct inode *sufile, __u64 segnum,
unsigned long nblocks, time_t modtime);
int nilfs_sufile_get_stat(struct inode *, struct nilfs_sustat *);
ssize_t nilfs_sufile_get_suinfo(struct inode *, __u64, void *, unsigned,
size_t);