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ext4: prepare to drop EXT4_STATE_DELALLOC_RESERVED

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The EXT4_STATE_DELALLOC_RESERVED flag was originally implemented
because it was too hard to make sure the mballoc and get_block flags
could be reliably passed down through all of the codepaths that end up
calling ext4_mb_new_blocks().

Since then, we have mb_flags passed down through most of the code
paths, so getting rid of EXT4_STATE_DELALLOC_RESERVED isn't as tricky
as it used to.

This commit plumbs in the last of what is required, and then adds a
WARN_ON check to make sure we haven't missed anything.  If this passes
a full regression test run, we can then drop
EXT4_STATE_DELALLOC_RESERVED.

Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Theodore Ts'o 2014-09-04 18:07:25 -04:00
parent a521100231
commit e3cf5d5d9a
5 changed files with 17 additions and 14 deletions
Download patch file Download diff file Expand all files Collapse all files

10
fs/ext4/mballoc.c
View file

@ -4415,9 +4415,12 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
* EDQUOT check, as blocks and quotas have been already
* reserved when data being copied into pagecache.
*/
if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED))
if (ext4_test_inode_state(ar->inode, EXT4_STATE_DELALLOC_RESERVED)) {
WARN_ON((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0);
ar->flags |= EXT4_MB_DELALLOC_RESERVED;
else {
}
if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0) {
/* Without delayed allocation we need to verify
* there is enough free blocks to do block allocation
* and verify allocation doesn't exceed the quota limits.
@ -4528,8 +4531,7 @@ out:
if (inquota && ar->len < inquota)
dquot_free_block(ar->inode, EXT4_C2B(sbi, inquota - ar->len));
if (!ar->len) {
if (!ext4_test_inode_state(ar->inode,
EXT4_STATE_DELALLOC_RESERVED))
if ((ar->flags & EXT4_MB_DELALLOC_RESERVED) == 0)
/* release all the reserved blocks if non delalloc */
percpu_counter_sub(&sbi->s_dirtyclusters_counter,
reserv_clstrs);