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Subject[37/90] ext4: store EXT4_EXT_MIGRATE in i_state instead of i_flags
2.6.31-stable review patch.  If anyone has any objections, please let us know.

------------------
(cherry picked from commit 1b9c12f44c1eb614fd3b8822bfe8f1f5d8e53737)

EXT4_EXT_MIGRATE is only intended to be used for an in-memory flag,
and the hex value assigned to it collides with FS_DIRECTIO_FL (which
is also stored in i_flags). There's no reason for the
EXT4_EXT_MIGRATE bit to be stored in i_flags, so we switch it to use
i_state instead.

Cc: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
fs/ext4/ext4.h | 2 +-
fs/ext4/inode.c | 6 ++----
fs/ext4/migrate.c | 20 ++++++++++----------
3 files changed, 13 insertions(+), 15 deletions(-)

--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -253,7 +253,6 @@ struct flex_groups {
#define EXT4_TOPDIR_FL 0x00020000 /* Top of directory hierarchies*/
#define EXT4_HUGE_FILE_FL 0x00040000 /* Set to each huge file */
#define EXT4_EXTENTS_FL 0x00080000 /* Inode uses extents */
-#define EXT4_EXT_MIGRATE 0x00100000 /* Inode is migrating */
#define EXT4_RESERVED_FL 0x80000000 /* reserved for ext4 lib */

#define EXT4_FL_USER_VISIBLE 0x000BDFFF /* User visible flags */
@@ -291,6 +290,7 @@ static inline __u32 ext4_mask_flags(umod
#define EXT4_STATE_XATTR 0x00000004 /* has in-inode xattrs */
#define EXT4_STATE_NO_EXPAND 0x00000008 /* No space for expansion */
#define EXT4_STATE_DA_ALLOC_CLOSE 0x00000010 /* Alloc DA blks on close */
+#define EXT4_STATE_EXT_MIGRATE 0x00000020 /* Inode is migrating */

/* Used to pass group descriptor data when online resize is done */
struct ext4_new_group_input {
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1256,8 +1256,7 @@ int ext4_get_blocks(handle_t *handle, st
* i_data's format changing. Force the migrate
* to fail by clearing migrate flags
*/
- EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags &
- ~EXT4_EXT_MIGRATE;
+ EXT4_I(inode)->i_state &= ~EXT4_STATE_EXT_MIGRATE;
}
}

@@ -4608,8 +4607,7 @@ static int ext4_do_update_inode(handle_t
if (ext4_inode_blocks_set(handle, raw_inode, ei))
goto out_brelse;
raw_inode->i_dtime = cpu_to_le32(ei->i_dtime);
- /* clear the migrate flag in the raw_inode */
- raw_inode->i_flags = cpu_to_le32(ei->i_flags & ~EXT4_EXT_MIGRATE);
+ raw_inode->i_flags = cpu_to_le32(ei->i_flags);
if (EXT4_SB(inode->i_sb)->s_es->s_creator_os !=
cpu_to_le32(EXT4_OS_HURD))
raw_inode->i_file_acl_high =
--- a/fs/ext4/migrate.c
+++ b/fs/ext4/migrate.c
@@ -353,17 +353,16 @@ static int ext4_ext_swap_inode_data(hand

down_write(&EXT4_I(inode)->i_data_sem);
/*
- * if EXT4_EXT_MIGRATE is cleared a block allocation
+ * if EXT4_STATE_EXT_MIGRATE is cleared a block allocation
* happened after we started the migrate. We need to
* fail the migrate
*/
- if (!(EXT4_I(inode)->i_flags & EXT4_EXT_MIGRATE)) {
+ if (!(EXT4_I(inode)->i_state & EXT4_STATE_EXT_MIGRATE)) {
retval = -EAGAIN;
up_write(&EXT4_I(inode)->i_data_sem);
goto err_out;
} else
- EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags &
- ~EXT4_EXT_MIGRATE;
+ EXT4_I(inode)->i_state &= ~EXT4_STATE_EXT_MIGRATE;
/*
* We have the extent map build with the tmp inode.
* Now copy the i_data across
@@ -517,14 +516,15 @@ int ext4_ext_migrate(struct inode *inode
* when we add extents we extent the journal
*/
/*
- * Even though we take i_mutex we can still cause block allocation
- * via mmap write to holes. If we have allocated new blocks we fail
- * migrate. New block allocation will clear EXT4_EXT_MIGRATE flag.
- * The flag is updated with i_data_sem held to prevent racing with
- * block allocation.
+ * Even though we take i_mutex we can still cause block
+ * allocation via mmap write to holes. If we have allocated
+ * new blocks we fail migrate. New block allocation will
+ * clear EXT4_STATE_EXT_MIGRATE flag. The flag is updated
+ * with i_data_sem held to prevent racing with block
+ * allocation.
*/
down_read((&EXT4_I(inode)->i_data_sem));
- EXT4_I(inode)->i_flags = EXT4_I(inode)->i_flags | EXT4_EXT_MIGRATE;
+ EXT4_I(inode)->i_state |= EXT4_STATE_EXT_MIGRATE;
up_read((&EXT4_I(inode)->i_data_sem));

handle = ext4_journal_start(inode, 1);



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