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Date: Sun, 22 Jun 2014 22:36:21 -0400
From: Theodore Ts'o <tytso@....edu>
To: Ext4 Developers List <linux-ext4@...r.kernel.org>
Cc: Theodore Ts'o <tytso@....edu>
Subject: [PATCH] ext4: remove metadata reservation checks
Commit 27dd43854227b ("ext4: introduce reserved space") reserves 2% of
the file system space to make sure metadata allocations will always
succeed. Given that, tracking the reservation of metadata blocks is
no longer necessary.
Signed-off-by: Theodore Ts'o <tytso@....edu>
---
fs/ext4/balloc.c | 1 -
fs/ext4/ext4.h | 1 -
fs/ext4/extents.c | 3 +-
fs/ext4/inode.c | 93 +++----------------------------------------------------
fs/ext4/mballoc.c | 15 +--------
5 files changed, 7 insertions(+), 106 deletions(-)
diff --git a/fs/ext4/balloc.c b/fs/ext4/balloc.c
index 0762d14..807071d 100644
--- a/fs/ext4/balloc.c
+++ b/fs/ext4/balloc.c
@@ -623,7 +623,6 @@ ext4_fsblk_t ext4_new_meta_blocks(handle_t *handle, struct inode *inode,
if (!(*errp) &&
ext4_test_inode_state(inode, EXT4_STATE_DELALLOC_RESERVED)) {
spin_lock(&EXT4_I(inode)->i_block_reservation_lock);
- EXT4_I(inode)->i_allocated_meta_blocks += ar.len;
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
dquot_alloc_block_nofail(inode,
EXT4_C2B(EXT4_SB(inode->i_sb), ar.len));
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 7cc5a0e..d35c78c 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -591,7 +591,6 @@ enum {
#define EXT4_FREE_BLOCKS_NO_QUOT_UPDATE 0x0008
#define EXT4_FREE_BLOCKS_NOFREE_FIRST_CLUSTER 0x0010
#define EXT4_FREE_BLOCKS_NOFREE_LAST_CLUSTER 0x0020
-#define EXT4_FREE_BLOCKS_RESERVE 0x0040
/*
* ioctl commands
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index 4da228a..b30172d 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -1808,8 +1808,7 @@ static void ext4_ext_try_to_merge_up(handle_t *handle,
brelse(path[1].p_bh);
ext4_free_blocks(handle, inode, NULL, blk, 1,
- EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET |
- EXT4_FREE_BLOCKS_RESERVE);
+ EXT4_FREE_BLOCKS_METADATA | EXT4_FREE_BLOCKS_FORGET);
}
/*
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 8a06473..4ccb624 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -357,35 +357,10 @@ void ext4_da_update_reserve_space(struct inode *inode,
used = ei->i_reserved_data_blocks;
}
- if (unlikely(ei->i_allocated_meta_blocks > ei->i_reserved_meta_blocks)) {
- ext4_warning(inode->i_sb, "ino %lu, allocated %d "
- "with only %d reserved metadata blocks "
- "(releasing %d blocks with reserved %d data blocks)",
- inode->i_ino, ei->i_allocated_meta_blocks,
- ei->i_reserved_meta_blocks, used,
- ei->i_reserved_data_blocks);
- WARN_ON(1);
- ei->i_allocated_meta_blocks = ei->i_reserved_meta_blocks;
- }
-
/* Update per-inode reservations */
ei->i_reserved_data_blocks -= used;
- ei->i_reserved_meta_blocks -= ei->i_allocated_meta_blocks;
- percpu_counter_sub(&sbi->s_dirtyclusters_counter,
- used + ei->i_allocated_meta_blocks);
- ei->i_allocated_meta_blocks = 0;
+ percpu_counter_sub(&sbi->s_dirtyclusters_counter, used);
- if (ei->i_reserved_data_blocks == 0) {
- /*
- * We can release all of the reserved metadata blocks
- * only when we have written all of the delayed
- * allocation blocks.
- */
- percpu_counter_sub(&sbi->s_dirtyclusters_counter,
- ei->i_reserved_meta_blocks);
- ei->i_reserved_meta_blocks = 0;
- ei->i_da_metadata_calc_len = 0;
- }
spin_unlock(&EXT4_I(inode)->i_block_reservation_lock);
/* Update quota subsystem for data blocks */
@@ -1232,35 +1207,6 @@ static int ext4_da_reserve_metadata(struct inode *inode, ext4_lblk_t lblock)
ext4_lblk_t save_last_lblock;
int save_len;
- /*
- * recalculate the amount of metadata blocks to reserve
- * in order to allocate nrblocks
- * worse case is one extent per block
- */
- spin_lock(&ei->i_block_reservation_lock);
- /*
- * ext4_calc_metadata_amount() has side effects, which we have
- * to be prepared undo if we fail to claim space.
- */
- save_len = ei->i_da_metadata_calc_len;
- save_last_lblock = ei->i_da_metadata_calc_last_lblock;
- md_needed = EXT4_NUM_B2C(sbi,
- ext4_calc_metadata_amount(inode, lblock));
- trace_ext4_da_reserve_space(inode, md_needed);
-
- /*
- * We do still charge estimated metadata to the sb though;
- * we cannot afford to run out of free blocks.
- */
- if (ext4_claim_free_clusters(sbi, md_needed, 0)) {
- ei->i_da_metadata_calc_len = save_len;
- ei->i_da_metadata_calc_last_lblock = save_last_lblock;
- spin_unlock(&ei->i_block_reservation_lock);
- return -ENOSPC;
- }
- ei->i_reserved_meta_blocks += md_needed;
- spin_unlock(&ei->i_block_reservation_lock);
-
return 0; /* success */
}
@@ -1295,25 +1241,15 @@ static int ext4_da_reserve_space(struct inode *inode, ext4_lblk_t lblock)
* ext4_calc_metadata_amount() has side effects, which we have
* to be prepared undo if we fail to claim space.
*/
- save_len = ei->i_da_metadata_calc_len;
- save_last_lblock = ei->i_da_metadata_calc_last_lblock;
- md_needed = EXT4_NUM_B2C(sbi,
- ext4_calc_metadata_amount(inode, lblock));
- trace_ext4_da_reserve_space(inode, md_needed);
+ md_needed = 0;
+ trace_ext4_da_reserve_space(inode, 0);
- /*
- * We do still charge estimated metadata to the sb though;
- * we cannot afford to run out of free blocks.
- */
- if (ext4_claim_free_clusters(sbi, md_needed + 1, 0)) {
- ei->i_da_metadata_calc_len = save_len;
- ei->i_da_metadata_calc_last_lblock = save_last_lblock;
+ if (ext4_claim_free_clusters(sbi, 1, 0)) {
spin_unlock(&ei->i_block_reservation_lock);
dquot_release_reservation_block(inode, EXT4_C2B(sbi, 1));
return -ENOSPC;
}
ei->i_reserved_data_blocks++;
- ei->i_reserved_meta_blocks += md_needed;
spin_unlock(&ei->i_block_reservation_lock);
return 0; /* success */
@@ -1346,20 +1282,6 @@ static void ext4_da_release_space(struct inode *inode, int to_free)
}
ei->i_reserved_data_blocks -= to_free;
- if (ei->i_reserved_data_blocks == 0) {
- /*
- * We can release all of the reserved metadata blocks
- * only when we have written all of the delayed
- * allocation blocks.
- * Note that in case of bigalloc, i_reserved_meta_blocks,
- * i_reserved_data_blocks, etc. refer to number of clusters.
- */
- percpu_counter_sub(&sbi->s_dirtyclusters_counter,
- ei->i_reserved_meta_blocks);
- ei->i_reserved_meta_blocks = 0;
- ei->i_da_metadata_calc_len = 0;
- }
-
/* update fs dirty data blocks counter */
percpu_counter_sub(&sbi->s_dirtyclusters_counter, to_free);
@@ -1500,10 +1422,6 @@ static void ext4_print_free_blocks(struct inode *inode)
ext4_msg(sb, KERN_CRIT, "Block reservation details");
ext4_msg(sb, KERN_CRIT, "i_reserved_data_blocks=%u",
ei->i_reserved_data_blocks);
- ext4_msg(sb, KERN_CRIT, "i_reserved_meta_blocks=%u",
- ei->i_reserved_meta_blocks);
- ext4_msg(sb, KERN_CRIT, "i_allocated_meta_blocks=%u",
- ei->i_allocated_meta_blocks);
return;
}
@@ -2843,8 +2761,7 @@ int ext4_alloc_da_blocks(struct inode *inode)
{
trace_ext4_alloc_da_blocks(inode);
- if (!EXT4_I(inode)->i_reserved_data_blocks &&
- !EXT4_I(inode)->i_reserved_meta_blocks)
+ if (!EXT4_I(inode)->i_reserved_data_blocks)
return 0;
/*
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 59e3162..4503b8f 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4619,7 +4619,6 @@ void ext4_free_blocks(handle_t *handle, struct inode *inode,
struct buffer_head *gd_bh;
ext4_group_t block_group;
struct ext4_sb_info *sbi;
- struct ext4_inode_info *ei = EXT4_I(inode);
struct ext4_buddy e4b;
unsigned int count_clusters;
int err = 0;
@@ -4830,19 +4829,7 @@ do_more:
&sbi->s_flex_groups[flex_group].free_clusters);
}
- if (flags & EXT4_FREE_BLOCKS_RESERVE && ei->i_reserved_data_blocks) {
- percpu_counter_add(&sbi->s_dirtyclusters_counter,
- count_clusters);
- spin_lock(&ei->i_block_reservation_lock);
- if (flags & EXT4_FREE_BLOCKS_METADATA)
- ei->i_reserved_meta_blocks += count_clusters;
- else
- ei->i_reserved_data_blocks += count_clusters;
- spin_unlock(&ei->i_block_reservation_lock);
- if (!(flags & EXT4_FREE_BLOCKS_NO_QUOT_UPDATE))
- dquot_reclaim_block(inode,
- EXT4_C2B(sbi, count_clusters));
- } else if (!(flags & EXT4_FREE_BLOCKS_NO_QUOT_UPDATE))
+ if (!(flags & EXT4_FREE_BLOCKS_NO_QUOT_UPDATE))
dquot_free_block(inode, EXT4_C2B(sbi, count_clusters));
percpu_counter_add(&sbi->s_freeclusters_counter, count_clusters);
--
2.0.0
--
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