This patch fix most visible problems with delalloc+quota issues
- ext4_get_reserved_space() must return bytes instead of blocks.
- Claim allocated meta blocks. Do it as we do for data blocks
but delay it until proper moment.
- Move space claiming to ext4_da_update_reserve_space()
Only here we do know what we are dealing with data or metadata
The most useful test case for delalloc+quota is concurrent tasks
with write+truncate vs chown for a same file.
Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
---
fs/ext4/inode.c | 13 ++++++++-----
fs/ext4/mballoc.c | 6 ------
2 files changed, 8 insertions(+), 11 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index ab22297..84863e6 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1057,7 +1057,7 @@ qsize_t ext4_get_reserved_space(struct inode *inode)
EXT4_I(inode)->i_reserved_meta_blocks;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
- return total;
+ return (total << inode->i_blkbits);
}
/*
* Calculate the number of metadata blocks need to reserve
@@ -1096,7 +1096,7 @@ static int ext4_calc_metadata_amount(struct inode *inode, int blocks)
static void ext4_da_update_reserve_space(struct inode *inode, int used)
{
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
- int total, mdb, mdb_free;
+ int total, mdb, mdb_free, mdb_claim = 0;
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
/* recalculate the number of metablocks still need to be reserved */
@@ -1109,7 +1109,9 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
if (mdb_free) {
/* Account for allocated meta_blocks */
- mdb_free -= EXT4_I(inode)->i_allocated_meta_blocks;
+ mdb_claim = EXT4_I(inode)->i_allocated_meta_blocks;
+ BUG_ON(mdb_free < mdb_claim);
+ mdb_free -= mdb_claim;
/* update fs dirty blocks counter */
percpu_counter_sub(&sbi->s_dirtyblocks_counter, mdb_free);
@@ -1119,8 +1121,9 @@ static void ext4_da_update_reserve_space(struct inode *inode, int used)
/* update per-inode reservations */
BUG_ON(used > EXT4_I(inode)->i_reserved_data_blocks);
- EXT4_I(inode)->i_reserved_data_blocks -= used;
- spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
+ EXT4_I(inode)->i_reserved_data_blocks -= used;
+ percpu_counter_sub(&sbi->s_dirtyblocks_counter, used + mdb_claim);
+ vfs_dq_claim_block(inode, used + mdb_claim);
/*
* free those over-booking quota for metadata blocks
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index bba1282..d4c52db 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -2750,12 +2750,6 @@ ext4_mb_mark_diskspace_used(struct ext4_allocation_context *ac,
if (!(ac->ac_flags & EXT4_MB_DELALLOC_RESERVED))
/* release all the reserved blocks if non delalloc */
percpu_counter_sub(&sbi->s_dirtyblocks_counter, reserv_blks);
- else {
- percpu_counter_sub(&sbi->s_dirtyblocks_counter,
- ac->ac_b_ex.fe_len);
- /* convert reserved quota blocks to real quota blocks */
- vfs_dq_claim_block(ac->ac_inode, ac->ac_b_ex.fe_len);
- }
if (sbi->s_log_groups_per_flex) {
ext4_group_t flex_group = ext4_flex_group(sbi,
--
1.6.0.4
--
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