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ext4: add flag to ext4_has_free_blocks

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This patch adds an allocation request flag to the ext4_has_free_blocks
function which enables the use of reserved blocks.  This will allow a
punch hole to proceed even if the disk is full.  Punching a hole may
require additional blocks to first split the extents.

Because ext4_has_free_blocks is a low level function, the flag needs
to be passed down through several functions listed below:

ext4_ext_insert_extent
ext4_ext_create_new_leaf
ext4_ext_grow_indepth
ext4_ext_split
ext4_ext_new_meta_block
ext4_mb_new_blocks
ext4_claim_free_blocks
ext4_has_free_blocks

[ext4 punch hole patch series 1/5 v7]

Signed-off-by: Allison Henderson <achender@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reviewed-by: Mingming Cao <cmm@us.ibm.com>
This commit is contained in:
Allison Henderson
2011-05-25 07:41:26 -04:00
committed by Theodore Ts'o
parent ae81230686
commit 55f020db66
6 changed files with 60 additions and 31 deletions
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16
fs/ext4/mballoc.c
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@@ -4236,7 +4236,9 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
* there is enough free blocks to do block allocation
* and verify allocation doesn't exceed the quota limits.
*/
while (ar->len && ext4_claim_free_blocks(sbi, ar->len)) {
while (ar->len &&
ext4_claim_free_blocks(sbi, ar->len, ar->flags)) {
/* let others to free the space */
yield();
ar->len = ar->len >> 1;
@@ -4246,9 +4248,15 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
return 0;
}
reserv_blks = ar->len;
while (ar->len && dquot_alloc_block(ar->inode, ar->len)) {
ar->flags |= EXT4_MB_HINT_NOPREALLOC;
ar->len--;
if (ar->flags & EXT4_MB_USE_ROOT_BLOCKS) {
dquot_alloc_block_nofail(ar->inode, ar->len);
} else {
while (ar->len &&
dquot_alloc_block(ar->inode, ar->len)) {
ar->flags |= EXT4_MB_HINT_NOPREALLOC;
ar->len--;
}
}
inquota = ar->len;
if (ar->len == 0) {