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f2fs: don't grab super block buffer header all the time

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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 <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2015-12-15 17:19:26 +08:00
committed by Jaegeuk Kim
parent b39f0de23d
commit e8240f656d
3 changed files with 39 additions and 54 deletions
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8
fs/f2fs/file.c
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@@ -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))