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| author | Mikulas Patocka <mpatocka@redhat.com> | 2011-07-22 01:59:22 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-23 02:43:30 +0200 |
| commit | 7f9838fd01833ffb30177d964983076924344c9e (patch) | |
| tree | 95487aa8962c0baaed05375f739a4a16a566a388 /fs/sysfs/dir.c | |
| parent | docs/sysfs: Specify ABI documentation requirements (diff) | |
| download | linux-7f9838fd01833ffb30177d964983076924344c9e.tar.xz linux-7f9838fd01833ffb30177d964983076924344c9e.zip | |
sysfs: count subdirectories
sysfs: count subdirectories
This patch introduces a subdirectory counter for each sysfs directory.
Without the patch, sysfs_refresh_inode would walk all entries of the directory
to calculate the number of subdirectories.
This patch improves time of "ls -la /sys/block" when there are 10000 block
devices from 9 seconds to 0.19 seconds.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs/sysfs/dir.c')
| -rw-r--r-- | fs/sysfs/dir.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/fs/sysfs/dir.c b/fs/sysfs/dir.c index ea9120a830d8..7d240e6b7176 100644 --- a/fs/sysfs/dir.c +++ b/fs/sysfs/dir.c @@ -47,6 +47,9 @@ static void sysfs_link_sibling(struct sysfs_dirent *sd) BUG_ON(sd->s_sibling); + if (sysfs_type(sd) == SYSFS_DIR) + parent_sd->s_dir.subdirs++; + /* Store directory entries in order by ino. This allows * readdir to properly restart without having to add a * cursor into the s_dir.children list. @@ -73,6 +76,9 @@ static void sysfs_unlink_sibling(struct sysfs_dirent *sd) { struct sysfs_dirent **pos; + if (sysfs_type(sd) == SYSFS_DIR) + sd->s_parent->s_dir.subdirs--; + for (pos = &sd->s_parent->s_dir.children; *pos; pos = &(*pos)->s_sibling) { if (*pos == sd) { |