ext2: Add ext2_sb_info s_lock spinlock

Add a spinlock that protects against concurrent modifications of
s_mount_state, s_blocks_last, s_overhead_last and the content of the
superblock's buffer pointed to by sbi->s_es. The spinlock is now used in
ext2_xattr_update_super_block() which was setting the
EXT2_FEATURE_COMPAT_EXT_ATTR flag on the superblock without protection
before. Likewise the spinlock is used in ext2_show_options() to have a
consistent view of the mount options.

This is a preparation patch for removing the BKL from ext2 in the next
patch.

Signed-off-by: Jan Blunck <[email protected]>
Cc: Andi Kleen <[email protected]>
Cc: Jan Kara <[email protected]>
Cc: OGAWA Hirofumi <[email protected]>
Signed-off-by: Jan Kara <[email protected]>

0 files changed, 0 insertions, 0 deletions