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nilfs2: add local variable to cache the number of clean segments 

This makes it possible for sufile to get the number of clean segments
faster.

Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
This commit is contained in:
Ryusuke Konishi 2009-11-13 03:41:55 +09:00
parent 7b16c8a211
commit aa474a2201
1 changed files with 43 additions and 10 deletions
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53
fs/nilfs2/sufile.c
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@ -31,6 +31,16 @@
#include "sufile.h"
struct nilfs_sufile_info {
struct nilfs_mdt_info mi;
unsigned long ncleansegs;
};
static inline struct nilfs_sufile_info *NILFS_SUI(struct inode *sufile)
{
return (struct nilfs_sufile_info *)NILFS_MDT(sufile);
}
static inline unsigned long
nilfs_sufile_segment_usages_per_block(const struct inode *sufile)
{
@ -300,6 +310,7 @@ int nilfs_sufile_alloc(struct inode *sufile, __u64 *segnump)
header->sh_last_alloc = cpu_to_le64(segnum);
kunmap_atomic(kaddr, KM_USER0);
NILFS_SUI(sufile)->ncleansegs--;
nilfs_mdt_mark_buffer_dirty(header_bh);
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
@ -342,6 +353,8 @@ void nilfs_sufile_do_cancel_free(struct inode *sufile, __u64 segnum,
kunmap_atomic(kaddr, KM_USER0);
nilfs_sufile_mod_counter(header_bh, -1, 1);
NILFS_SUI(sufile)->ncleansegs--;
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
}
@ -371,6 +384,8 @@ void nilfs_sufile_do_scrap(struct inode *sufile, __u64 segnum,
kunmap_atomic(kaddr, KM_USER0);
nilfs_sufile_mod_counter(header_bh, clean ? (u64)-1 : 0, dirty ? 0 : 1);
NILFS_SUI(sufile)->ncleansegs -= clean;
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
}
@ -400,6 +415,8 @@ void nilfs_sufile_do_free(struct inode *sufile, __u64 segnum,
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_sufile_mod_counter(header_bh, 1, sudirty ? (u64)-1 : 0);
NILFS_SUI(sufile)->ncleansegs++;
nilfs_mdt_mark_dirty(sufile);
}
@ -541,13 +558,8 @@ int nilfs_sufile_get_stat(struct inode *sufile, struct nilfs_sustat *sustat)
*/
int nilfs_sufile_get_ncleansegs(struct inode *sufile, unsigned long *nsegsp)
{
struct nilfs_sustat sustat;
int ret;
ret = nilfs_sufile_get_stat(sufile, &sustat);
if (ret == 0)
*nsegsp = sustat.ss_ncleansegs;
return ret;
*nsegsp = NILFS_SUI(sufile)->ncleansegs;
return 0;
}
void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
@ -568,8 +580,10 @@ void nilfs_sufile_do_set_error(struct inode *sufile, __u64 segnum,
nilfs_segment_usage_set_error(su);
kunmap_atomic(kaddr, KM_USER0);
if (suclean)
if (suclean) {
nilfs_sufile_mod_counter(header_bh, -1, 0);
NILFS_SUI(sufile)->ncleansegs--;
}
nilfs_mdt_mark_buffer_dirty(su_bh);
nilfs_mdt_mark_dirty(sufile);
}
@ -656,7 +670,25 @@ ssize_t nilfs_sufile_get_suinfo(struct inode *sufile, __u64 segnum, void *buf,
*/
int nilfs_sufile_read(struct inode *sufile, struct nilfs_inode *raw_inode)
{
return nilfs_read_inode_common(sufile, raw_inode);
struct nilfs_sufile_info *sui = NILFS_SUI(sufile);
struct buffer_head *header_bh;
struct nilfs_sufile_header *header;
void *kaddr;
int ret;
ret = nilfs_read_inode_common(sufile, raw_inode);
if (ret < 0)
return ret;
ret = nilfs_sufile_get_header_block(sufile, &header_bh);
if (!ret) {
kaddr = kmap_atomic(header_bh->b_page, KM_USER0);
header = kaddr + bh_offset(header_bh);
sui->ncleansegs = le64_to_cpu(header->sh_ncleansegs);
kunmap_atomic(kaddr, KM_USER0);
brelse(header_bh);
}
return ret;
}
/**
@ -668,7 +700,8 @@ struct inode *nilfs_sufile_new(struct the_nilfs *nilfs, size_t susize)
{
struct inode *sufile;
sufile = nilfs_mdt_new(nilfs, NULL, NILFS_SUFILE_INO, 0);
sufile = nilfs_mdt_new(nilfs, NULL, NILFS_SUFILE_INO,
sizeof(struct nilfs_sufile_info));
if (sufile)
nilfs_mdt_set_entry_size(sufile, susize,
sizeof(struct nilfs_sufile_header));