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f2fs: use lock_buffer when changing superblock 

When modifying sb contents, we need to use lock its buffer.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-12-07 10:18:54 -08:00
parent 5d909cdbbb
commit ea212a4a7a
1 changed files with 4 additions and 0 deletions
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4
fs/f2fs/file.c
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@ -1591,14 +1591,18 @@ 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);
return err;
}
got_it: