ext3: Use bitops to read/modify EXT3_I(inode)->i_state
At several places we modify EXT3_I(inode)->i_state without holding i_mutex
(ext3_release_file, ext3_bmap, ext3_journalled_writepage, ext3_do_update_inode,
...). These modifications are racy and we can lose updates to i_state. So
convert handling of i_state to use bitops which are atomic.
Signed-off-by: Jan Kara <jack@suse.cz>
diff --git a/include/linux/ext3_fs.h b/include/linux/ext3_fs.h
index 6b04903..e6590f8 100644
--- a/include/linux/ext3_fs.h
+++ b/include/linux/ext3_fs.h
@@ -202,14 +202,6 @@
return flags & EXT3_OTHER_FLMASK;
}
-/*
- * Inode dynamic state flags
- */
-#define EXT3_STATE_JDATA 0x00000001 /* journaled data exists */
-#define EXT3_STATE_NEW 0x00000002 /* inode is newly created */
-#define EXT3_STATE_XATTR 0x00000004 /* has in-inode xattrs */
-#define EXT3_STATE_FLUSH_ON_CLOSE 0x00000008
-
/* Used to pass group descriptor data when online resize is done */
struct ext3_new_group_input {
__u32 group; /* Group number for this data */
@@ -560,6 +552,31 @@
(ino >= EXT3_FIRST_INO(sb) &&
ino <= le32_to_cpu(EXT3_SB(sb)->s_es->s_inodes_count));
}
+
+/*
+ * Inode dynamic state flags
+ */
+enum {
+ EXT3_STATE_JDATA, /* journaled data exists */
+ EXT3_STATE_NEW, /* inode is newly created */
+ EXT3_STATE_XATTR, /* has in-inode xattrs */
+ EXT3_STATE_FLUSH_ON_CLOSE, /* flush dirty pages on close */
+};
+
+static inline int ext3_test_inode_state(struct inode *inode, int bit)
+{
+ return test_bit(bit, &EXT3_I(inode)->i_state);
+}
+
+static inline void ext3_set_inode_state(struct inode *inode, int bit)
+{
+ set_bit(bit, &EXT3_I(inode)->i_state);
+}
+
+static inline void ext3_clear_inode_state(struct inode *inode, int bit)
+{
+ clear_bit(bit, &EXT3_I(inode)->i_state);
+}
#else
/* Assume that user mode programs are passing in an ext3fs superblock, not
* a kernel struct super_block. This will allow us to call the feature-test