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authorAllison Henderson <achender@linux.vnet.ibm.com>2011-05-25 15:41:26 +0400
committerTheodore Ts'o <tytso@mit.edu>2011-05-25 15:41:26 +0400
commit55f020db66ce187fb8c8e4002a94b0eb714da450 (patch)
treee98214511542f57fa93074be12e27c4819520333 /fs/ext4/balloc.c
parentae81230686282af745ebb7a74c0332349cb9131a (diff)
downloadlinux-55f020db66ce187fb8c8e4002a94b0eb714da450.tar.xz
ext4: add flag to ext4_has_free_blocks
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>
Diffstat (limited to 'fs/ext4/balloc.c')
-rw-r--r--fs/ext4/balloc.c17
1 files changed, 11 insertions, 6 deletions
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index b2d10da505ef..264f6949511e 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -369,7 +369,8 @@ ext4_read_block_bitmap(struct super_block *sb, ext4_group_t block_group)
* Check if filesystem has nblocks free & available for allocation.
* On success return 1, return 0 on failure.
*/
-static int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
+static int ext4_has_free_blocks(struct ext4_sb_info *sbi,
+ s64 nblocks, unsigned int flags)
{
s64 free_blocks, dirty_blocks, root_blocks;
struct percpu_counter *fbc = &sbi->s_freeblocks_counter;
@@ -393,7 +394,9 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
/* Hm, nope. Are (enough) root reserved blocks available? */
if (sbi->s_resuid == current_fsuid() ||
((sbi->s_resgid != 0) && in_group_p(sbi->s_resgid)) ||
- capable(CAP_SYS_RESOURCE)) {
+ capable(CAP_SYS_RESOURCE) ||
+ (flags & EXT4_MB_USE_ROOT_BLOCKS)) {
+
if (free_blocks >= (nblocks + dirty_blocks))
return 1;
}
@@ -402,9 +405,9 @@ static int ext4_has_free_blocks(struct ext4_sb_info *sbi, s64 nblocks)
}
int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
- s64 nblocks)
+ s64 nblocks, unsigned int flags)
{
- if (ext4_has_free_blocks(sbi, nblocks)) {
+ if (ext4_has_free_blocks(sbi, nblocks, flags)) {
percpu_counter_add(&sbi->s_dirtyblocks_counter, nblocks);
return 0;
} else
@@ -425,7 +428,7 @@ int ext4_claim_free_blocks(struct ext4_sb_info *sbi,
*/
int ext4_should_retry_alloc(struct super_block *sb, int *retries)
{
- if (!ext4_has_free_blocks(EXT4_SB(sb), 1) ||
+ if (!ext4_has_free_blocks(EXT4_SB(sb), 1, 0) ||
(*retries)++ > 3 ||
!EXT4_SB(sb)->s_journal)
return 0;
@@ -448,7 +451,8 @@ int ext4_should_retry_alloc(struct super_block *sb, int *retries)
* error stores in errp pointer
*/
ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
- ext4_fsblk_t goal, unsigned long *count, int *errp)
+ ext4_fsblk_t goal, unsigned int flags,
+ unsigned long *count, int *errp)
{
struct ext4_allocation_request ar;
ext4_fsblk_t ret;
@@ -458,6 +462,7 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
ar.inode = inode;
ar.goal = goal;
ar.len = count ? *count : 1;
+ ar.flags = flags;
ret = ext4_mb_new_blocks(handle, &ar, errp);
if (count)