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| author | Mikulas Patocka <mpatocka@redhat.com> | 2011-07-21 19:59:22 -0400 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-08-22 17:43:30 -0700 |
| commit | 7f9838fd01833ffb30177d964983076924344c9e (patch) | |
| tree | 95487aa8962c0baaed05375f739a4a16a566a388 /fs/sysfs/inode.c | |
| parent | 86028619b9f653a30f5aa0d331fdedd899a1eea5 (diff) | |
| download | lwn-7f9838fd01833ffb30177d964983076924344c9e.tar.gz lwn-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/inode.c')
| -rw-r--r-- | fs/sysfs/inode.c | 14 |
1 files changed, 1 insertions, 13 deletions
diff --git a/fs/sysfs/inode.c b/fs/sysfs/inode.c index e3f091a81c72..1ee18c81df78 100644 --- a/fs/sysfs/inode.c +++ b/fs/sysfs/inode.c @@ -202,18 +202,6 @@ static inline void set_inode_attr(struct inode * inode, struct iattr * iattr) inode->i_ctime = iattr->ia_ctime; } -static int sysfs_count_nlink(struct sysfs_dirent *sd) -{ - struct sysfs_dirent *child; - int nr = 0; - - for (child = sd->s_dir.children; child; child = child->s_sibling) - if (sysfs_type(child) == SYSFS_DIR) - nr++; - - return nr + 2; -} - static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode) { struct sysfs_inode_attrs *iattrs = sd->s_iattr; @@ -230,7 +218,7 @@ static void sysfs_refresh_inode(struct sysfs_dirent *sd, struct inode *inode) } if (sysfs_type(sd) == SYSFS_DIR) - inode->i_nlink = sysfs_count_nlink(sd); + inode->i_nlink = sd->s_dir.subdirs + 2; } int sysfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) |