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ext4: make prefetch_block_bitmaps default

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Block bitmap prefetching is needed for these allocator optimization
data structures to get populated and provide better group scanning
order. So, turn it on bu default. prefetch_block_bitmaps mount option
is now marked as removed and a new option no_prefetch_block_bitmaps is
added to disable block bitmap prefetching.

Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20210401172129.189766-8-harshadshirwadkar@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
This commit is contained in:
Harshad Shirwadkar 2021-04-01 10:21:29 -07:00 committed by Theodore Ts'o
parent f68f406385
commit 21175ca434
2 changed files with 9 additions and 8 deletions
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2
fs/ext4/ext4.h
View file

@ -1227,7 +1227,7 @@ struct ext4_inode_info {
#define EXT4_MOUNT_JOURNAL_CHECKSUM 0x800000 /* Journal checksums */
#define EXT4_MOUNT_JOURNAL_ASYNC_COMMIT 0x1000000 /* Journal Async Commit */
#define EXT4_MOUNT_WARN_ON_ERROR 0x2000000 /* Trigger WARN_ON on error */
#define EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS 0x4000000
#define EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS 0x4000000
#define EXT4_MOUNT_DELALLOC 0x8000000 /* Delalloc support */
#define EXT4_MOUNT_DATA_ERR_ABORT 0x10000000 /* Abort on file data write */
#define EXT4_MOUNT_BLOCK_VALIDITY 0x20000000 /* Block validity checking */

15
fs/ext4/super.c
View file

@ -1688,7 +1688,7 @@ enum {
Opt_dioread_nolock, Opt_dioread_lock,
Opt_discard, Opt_nodiscard, Opt_init_itable, Opt_noinit_itable,
Opt_max_dir_size_kb, Opt_nojournal_checksum, Opt_nombcache,
Opt_prefetch_block_bitmaps, Opt_mb_optimize_scan,
Opt_no_prefetch_block_bitmaps, Opt_mb_optimize_scan,
#ifdef CONFIG_EXT4_DEBUG
Opt_fc_debug_max_replay, Opt_fc_debug_force
#endif
@ -1788,7 +1788,8 @@ static const match_table_t tokens = {
{Opt_inlinecrypt, "inlinecrypt"},
{Opt_nombcache, "nombcache"},
{Opt_nombcache, "no_mbcache"}, /* for backward compatibility */
{Opt_prefetch_block_bitmaps, "prefetch_block_bitmaps"},
{Opt_removed, "prefetch_block_bitmaps"},
{Opt_no_prefetch_block_bitmaps, "no_prefetch_block_bitmaps"},
{Opt_mb_optimize_scan, "mb_optimize_scan=%d"},
{Opt_removed, "check=none"}, /* mount option from ext2/3 */
{Opt_removed, "nocheck"}, /* mount option from ext2/3 */
@ -2010,7 +2011,7 @@ static const struct mount_opts {
{Opt_max_dir_size_kb, 0, MOPT_GTE0},
{Opt_test_dummy_encryption, 0, MOPT_STRING},
{Opt_nombcache, EXT4_MOUNT_NO_MBCACHE, MOPT_SET},
{Opt_prefetch_block_bitmaps, EXT4_MOUNT_PREFETCH_BLOCK_BITMAPS,
{Opt_no_prefetch_block_bitmaps, EXT4_MOUNT_NO_PREFETCH_BLOCK_BITMAPS,
MOPT_SET},
{Opt_mb_optimize_scan, EXT4_MOUNT2_MB_OPTIMIZE_SCAN, MOPT_GTE0},
#ifdef CONFIG_EXT4_DEBUG
@ -3707,11 +3708,11 @@ static struct ext4_li_request *ext4_li_request_new(struct super_block *sb,
elr->lr_super = sb;
elr->lr_first_not_zeroed = start;
if (test_opt(sb, PREFETCH_BLOCK_BITMAPS))
elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
else {
if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS)) {
elr->lr_mode = EXT4_LI_MODE_ITABLE;
elr->lr_next_group = start;
} else {
elr->lr_mode = EXT4_LI_MODE_PREFETCH_BBITMAP;
}
/*
@ -3742,7 +3743,7 @@ int ext4_register_li_request(struct super_block *sb,
goto out;
}
if (!test_opt(sb, PREFETCH_BLOCK_BITMAPS) &&
if (test_opt(sb, NO_PREFETCH_BLOCK_BITMAPS) &&
(first_not_zeroed == ngroups || sb_rdonly(sb) ||
!test_opt(sb, INIT_INODE_TABLE)))
goto out;