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>
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 8834472..e9b4cec 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -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 @@
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 @@
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 @@
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 @@
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_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 @@
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 @@
*/
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 *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));