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authorJan Blunck <jblunck@suse.de>2010-04-14 14:38:38 +0200
committerJan Kara <jack@suse.cz>2010-05-21 19:30:39 +0200
commitc15271f4e74cd6dbdf461335d6d1450949c4b956 (patch)
tree585738bde9a80e580686072d02cd6c1e5d261c1e /include/linux/ext2_fs_sb.h
parent4c96a68bfc110d87b28bcee4c395a7b4d26ed67a (diff)
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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 <jblunck@suse.de> Cc: Andi Kleen <andi@firstfloor.org> Cc: Jan Kara <jack@suse.cz> Cc: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp> Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'include/linux/ext2_fs_sb.h')
-rw-r--r--include/linux/ext2_fs_sb.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/ext2_fs_sb.h b/include/linux/ext2_fs_sb.h
index 1cdb663..db4d9f5 100644
--- a/include/linux/ext2_fs_sb.h
+++ b/include/linux/ext2_fs_sb.h
@@ -106,6 +106,15 @@ struct ext2_sb_info {
spinlock_t s_rsv_window_lock;
struct rb_root s_rsv_window_root;
struct ext2_reserve_window_node s_rsv_window_head;
+ /*
+ * s_lock protects against concurrent modifications of s_mount_state,
+ * s_blocks_last, s_overhead_last and the content of superblock's
+ * buffer pointed to by sbi->s_es.
+ *
+ * Note: It is used in ext2_show_options() to provide a consistent view
+ * of the mount options.
+ */
+ spinlock_t s_lock;
};
static inline spinlock_t *