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ext4: Clean up ext4_get_blocks() so it does not depend on bh_result->b_state

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The ext4_get_blocks() function was depending on the value of
bh_result->b_state as an input parameter to decide whether or not
update the delalloc accounting statistics by calling
ext4_da_update_reserve_space().  We now use a separate flag,
EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE, to requests this update, so that
all callers of ext4_get_blocks() can clear map_bh.b_state before
calling ext4_get_blocks() without worrying about any consistency
issues.

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2009-05-14 13:57:08 -04:00
parent 2fa3cdfb31
commit 2ac3b6e00a
2 changed files with 41 additions and 30 deletions
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15
fs/ext4/ext4.h
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@@ -318,16 +318,21 @@ struct ext4_new_group_data {
*/
/* Allocate any needed blocks and/or convert an unitialized
extent to be an initialized ext4 */
#define EXT4_GET_BLOCKS_CREATE 1
#define EXT4_GET_BLOCKS_CREATE 0x0001
/* Request the creation of an unitialized extent */
#define EXT4_GET_BLOCKS_UNINIT_EXT 2
#define EXT4_GET_BLOCKS_UNINIT_EXT 0x0002
#define EXT4_GET_BLOCKS_CREATE_UNINIT_EXT (EXT4_GET_BLOCKS_UNINIT_EXT|\
EXT4_GET_BLOCKS_CREATE)
/* Update the ext4_inode_info i_disksize field */
#define EXT4_GET_BLOCKS_EXTEND_DISKSIZE 4
#define EXT4_GET_BLOCKS_EXTEND_DISKSIZE 0x0004
/* Caller is from the delayed allocation writeout path,
so the filesystem blocks have already been accounted for */
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 8
so set the magic i_delalloc_reserve_flag after taking the
inode allocation semaphore for */
#define EXT4_GET_BLOCKS_DELALLOC_RESERVE 0x0008
/* Call ext4_da_update_reserve_space() after successfully
allocating the blocks */
#define EXT4_GET_BLOCKS_UPDATE_RESERVE_SPACE 0x0010
/*
* ioctl commands