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>

4 files changed, 39 insertions, 1 deletions

diff --git a/fs/ext2/inode.c b/fs/ext2/inode.c
index fc13cc119aad..5d15442abbd0 100644
--- a/fs/ext2/inode.c
+++ b/fs/ext2/inode.c
@@ -1407,9 +1407,11 @@ static int __ext2_write_inode(struct inode *inode, int do_sync)
                                 * created, add a flag to the superblock.
                                 */
                                 lock_kernel();
+                                spin_lock(&EXT2_SB(sb)->s_lock);
                                 ext2_update_dynamic_rev(sb);
                                 EXT2_SET_RO_COMPAT_FEATURE(sb,
                                         EXT2_FEATURE_RO_COMPAT_LARGE_FILE);
+                                spin_unlock(&EXT2_SB(sb)->s_lock);
                                 unlock_kernel();
                                 ext2_write_super(sb);
                         }
diff --git a/fs/ext2/super.c b/fs/ext2/super.c
index f28a7ad02af9..28f65609589d 100644
--- a/fs/ext2/super.c
+++ b/fs/ext2/super.c
@@ -52,8 +52,10 @@ void ext2_error (struct super_block * sb, const char * function,
         struct ext2_super_block *es = sbi->s_es;
 
         if (!(sb->s_flags & MS_RDONLY)) {
+                spin_lock(&sbi->s_lock);
                 sbi->s_mount_state |= EXT2_ERROR_FS;
                 es->s_state |= cpu_to_le16(EXT2_ERROR_FS);
+                spin_unlock(&sbi->s_lock);
                 ext2_sync_super(sb, es, 1);
         }
 
@@ -84,6 +86,9 @@ void ext2_msg(struct super_block *sb, const char *prefix,
         va_end(args);
 }
 
+/*
+ * This must be called with sbi->s_lock held.
+ */
 void ext2_update_dynamic_rev(struct super_block *sb)
 {
         struct ext2_super_block *es = EXT2_SB(sb)->s_es;
@@ -124,7 +129,9 @@ static void ext2_put_super (struct super_block * sb)
         if (!(sb->s_flags & MS_RDONLY)) {
                 struct ext2_super_block *es = sbi->s_es;
 
+                spin_lock(&sbi->s_lock);
                 es->s_state = cpu_to_le16(sbi->s_mount_state);
+                spin_unlock(&sbi->s_lock);
                 ext2_sync_super(sb, es, 1);
         }
         db_count = sbi->s_gdb_count;
@@ -209,6 +216,7 @@ static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
         struct ext2_super_block *es = sbi->s_es;
         unsigned long def_mount_opts;
 
+        spin_lock(&sbi->s_lock);
         def_mount_opts = le32_to_cpu(es->s_default_mount_opts);
 
         if (sbi->s_sb_block != 1)
@@ -281,6 +289,7 @@ static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs)
         if (!test_opt(sb, RESERVATION))
                 seq_puts(seq, ",noreservation");
 
+        spin_unlock(&sbi->s_lock);
         return 0;
 }
 
@@ -766,6 +775,8 @@ static int ext2_fill_super(struct super_block *sb, void *data, int silent)
         sb->s_fs_info = sbi;
         sbi->s_sb_block = sb_block;
 
+        spin_lock_init(&sbi->s_lock);
+
         /*
          * See what the current blocksize for the device is, and
          * use that as the blocksize.  Otherwise (or if the blocksize
@@ -1132,9 +1143,12 @@ static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
                             int wait)
 {
         ext2_clear_super_error(sb);
+        spin_lock(&EXT2_SB(sb)->s_lock);
         es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb));
         es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb));
         es->s_wtime = cpu_to_le32(get_seconds());
+        /* unlock before we do IO */
+        spin_unlock(&EXT2_SB(sb)->s_lock);
         mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
         if (wait)
                 sync_dirty_buffer(EXT2_SB(sb)->s_sbh);
@@ -1151,16 +1165,18 @@ static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es,
  * may have been checked while mounted and e2fsck may have
  * set s_state to EXT2_VALID_FS after some corrections.
  */
-
 static int ext2_sync_fs(struct super_block *sb, int wait)
 {
+        struct ext2_sb_info *sbi = EXT2_SB(sb);
         struct ext2_super_block *es = EXT2_SB(sb)->s_es;
 
         lock_kernel();
+        spin_lock(&sbi->s_lock);
         if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) {
                 ext2_debug("setting valid to 0\n");
                 es->s_state &= cpu_to_le16(~EXT2_VALID_FS);
         }
+        spin_unlock(&sbi->s_lock);
         ext2_sync_super(sb, es, wait);
         unlock_kernel();
 
@@ -1186,6 +1202,7 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
         int err;
 
         lock_kernel();
+        spin_lock(&sbi->s_lock);
 
         /* Store the old options */
         old_sb_flags = sb->s_flags;
@@ -1224,12 +1241,14 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
                 sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP;
         }
         if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) {
+                spin_unlock(&sbi->s_lock);
                 unlock_kernel();
                 return 0;
         }
         if (*flags & MS_RDONLY) {
                 if (le16_to_cpu(es->s_state) & EXT2_VALID_FS ||
                     !(sbi->s_mount_state & EXT2_VALID_FS)) {
+                        spin_unlock(&sbi->s_lock);
                         unlock_kernel();
                         return 0;
                 }
@@ -1239,6 +1258,7 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
                  */
                 es->s_state = cpu_to_le16(sbi->s_mount_state);
                 es->s_mtime = cpu_to_le32(get_seconds());
+                spin_unlock(&sbi->s_lock);
                 ext2_sync_super(sb, es, 1);
         } else {
                 __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb,
@@ -1259,6 +1279,7 @@ static int ext2_remount (struct super_block * sb, int * flags, char * data)
                 sbi->s_mount_state = le16_to_cpu(es->s_state);
                 if (!ext2_setup_super (sb, es, 0))
                         sb->s_flags &= ~MS_RDONLY;
+                spin_unlock(&sbi->s_lock);
                 ext2_write_super(sb);
         }
         unlock_kernel();
@@ -1268,6 +1289,7 @@ restore_opts:
         sbi->s_resuid = old_opts.s_resuid;
         sbi->s_resgid = old_opts.s_resgid;
         sb->s_flags = old_sb_flags;
+        spin_unlock(&sbi->s_lock);
         unlock_kernel();
         return err;
 }
@@ -1279,6 +1301,8 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
         struct ext2_super_block *es = sbi->s_es;
         u64 fsid;
 
+        spin_lock(&sbi->s_lock);
+
         if (test_opt (sb, MINIX_DF))
                 sbi->s_overhead_last = 0;
         else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) {
@@ -1333,6 +1357,7 @@ static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf)
                le64_to_cpup((void *)es->s_uuid + sizeof(u64));
         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
+        spin_unlock(&sbi->s_lock);
         return 0;
 }
 
diff --git a/fs/ext2/xattr.c b/fs/ext2/xattr.c
index e44dc92609be..3b96045a00ce 100644
--- a/fs/ext2/xattr.c
+++ b/fs/ext2/xattr.c
@@ -345,7 +345,9 @@ static void ext2_xattr_update_super_block(struct super_block *sb)
         if (EXT2_HAS_COMPAT_FEATURE(sb, EXT2_FEATURE_COMPAT_EXT_ATTR))
                 return;
 
+        spin_lock(&EXT2_SB(sb)->s_lock);
         EXT2_SET_COMPAT_FEATURE(sb, EXT2_FEATURE_COMPAT_EXT_ATTR);
+        spin_unlock(&EXT2_SB(sb)->s_lock);
         sb->s_dirt = 1;
         mark_buffer_dirty(EXT2_SB(sb)->s_sbh);
 }
diff --git a/include/linux/ext2_fs_sb.h b/include/linux/ext2_fs_sb.h
index 1cdb66367c98..db4d9f586bb6 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 *