f2fs: don't grab super block buffer header all the time
PATCH 2/3 f2fs: don't grab super block buffer header all the time
We have already got one copy of valid super block in memory, do not grab buffer header of super block all the time.
Signed-off-by Chao Yu <[email protected]>
--- fs/f2fs/f2fs.h | 2 +- fs/f2fs/file.c | 8 ++---- fs/f2fs/super.c | 81 +++++++++++++++++++++++++-------------------------------- 3 files changed, 38 insertions(+), 53 deletions(-)
fs/f2fs/f2fs.h +1 -1
@@ -723,8 +723,8 @@ enum {struct f2fs_sb_info {struct super_block *sb;/* pointer to VFS super block */ struct proc_dir_entry *s_proc;/* proc entry */ -struct buffer_head *raw_super_buf;/* buffer head of raw sb */ struct f2fs_super_block *raw_super;/* raw super block pointer */ +int valid_super_block;/* valid super block no */ int s_flag;/* flags for sbi */ /* for node-related operations */
fs/f2fs/file.c +2 -6
@@ -1591,20 +1591,16 @@ static int f2fs_ioc_get_encryption_pwsalt(struct file *filp, unsigned long arg)return err;/* update superblock with uuid */ -lock_buffer (sbi->raw_super_buf);generate_random_uuid (sbi->raw_super->encrypt_pw_salt); -unlock_buffer (sbi->raw_super_buf); err =f2fs_commit_super (sbi, false); - -mnt_drop_write_file (filp);if (err) {/* undo new data */ -lock_buffer (sbi->raw_super_buf);memset (sbi->raw_super->encrypt_pw_salt,0 ,16 ); -unlock_buffer (sbi->raw_super_buf); +mnt_drop_write_file (filp);return err; } +mnt_drop_write_file (filp); got_it:if (copy_to_user ((__u8 __user *)arg, sbi->raw_super->encrypt_pw_salt,16 ))
fs/f2fs/super.c +35 -46
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2.6.3