5.15-stable review patch. If anyone has any objections, please let me know.
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From: Kemeng Shi shikemeng@huaweicloud.com
[ Upstream commit ad78b5efe4246e5deba8d44a6ed172b8a00d3113 ]
Two cleanups for ext4_mb_new_blocks_simple: Remove unused parameter handle of ext4_mb_new_blocks_simple. Move ext4_mb_new_blocks_simple definition before ext4_mb_new_blocks to remove unnecessary forward declaration of ext4_mb_new_blocks_simple.
Signed-off-by: Kemeng Shi shikemeng@huaweicloud.com Reviewed-by: Ojaswin Mujoo ojaswin@linux.ibm.com Link: https://lore.kernel.org/r/20230603150327.3596033-10-shikemeng@huaweicloud.co... Signed-off-by: Theodore Ts'o tytso@mit.edu Stable-dep-of: 3f4830abd236 ("ext4: fix potential unnitialized variable") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ext4/mballoc.c | 137 +++++++++++++++++++++++----------------------- 1 file changed, 67 insertions(+), 70 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c index a346ab8f3e5f4..e85123e447f14 100644 --- a/fs/ext4/mballoc.c +++ b/fs/ext4/mballoc.c @@ -5620,8 +5620,72 @@ static bool ext4_mb_discard_preallocations_should_retry(struct super_block *sb, return ret; }
-static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle, - struct ext4_allocation_request *ar, int *errp); +/* + * Simple allocator for Ext4 fast commit replay path. It searches for blocks + * linearly starting at the goal block and also excludes the blocks which + * are going to be in use after fast commit replay. + */ +static ext4_fsblk_t +ext4_mb_new_blocks_simple(struct ext4_allocation_request *ar, int *errp) +{ + struct buffer_head *bitmap_bh; + struct super_block *sb = ar->inode->i_sb; + struct ext4_sb_info *sbi = EXT4_SB(sb); + ext4_group_t group, nr; + ext4_grpblk_t blkoff; + ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb); + ext4_grpblk_t i = 0; + ext4_fsblk_t goal, block; + struct ext4_super_block *es = EXT4_SB(sb)->s_es; + + goal = ar->goal; + if (goal < le32_to_cpu(es->s_first_data_block) || + goal >= ext4_blocks_count(es)) + goal = le32_to_cpu(es->s_first_data_block); + + ar->len = 0; + ext4_get_group_no_and_offset(sb, goal, &group, &blkoff); + for (nr = ext4_get_groups_count(sb); nr > 0; nr--) { + bitmap_bh = ext4_read_block_bitmap(sb, group); + if (IS_ERR(bitmap_bh)) { + *errp = PTR_ERR(bitmap_bh); + pr_warn("Failed to read block bitmap\n"); + return 0; + } + + while (1) { + i = mb_find_next_zero_bit(bitmap_bh->b_data, max, + blkoff); + if (i >= max) + break; + if (ext4_fc_replay_check_excluded(sb, + ext4_group_first_block_no(sb, group) + + EXT4_C2B(sbi, i))) { + blkoff = i + 1; + } else + break; + } + brelse(bitmap_bh); + if (i < max) + break; + + if (++group >= ext4_get_groups_count(sb)) + group = 0; + + blkoff = 0; + } + + if (i >= max) { + *errp = -ENOSPC; + return 0; + } + + block = ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, i); + ext4_mb_mark_bb(sb, block, 1, 1); + ar->len = 1; + + return block; +}
/* * Main entry point into mballoc to allocate blocks @@ -5646,7 +5710,7 @@ ext4_fsblk_t ext4_mb_new_blocks(handle_t *handle,
trace_ext4_request_blocks(ar); if (sbi->s_mount_state & EXT4_FC_REPLAY) - return ext4_mb_new_blocks_simple(handle, ar, errp); + return ext4_mb_new_blocks_simple(ar, errp);
/* Allow to use superuser reservation for quota file */ if (ext4_is_quota_file(ar->inode)) @@ -5876,73 +5940,6 @@ ext4_mb_free_metadata(handle_t *handle, struct ext4_buddy *e4b, return 0; }
-/* - * Simple allocator for Ext4 fast commit replay path. It searches for blocks - * linearly starting at the goal block and also excludes the blocks which - * are going to be in use after fast commit replay. - */ -static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle, - struct ext4_allocation_request *ar, int *errp) -{ - struct buffer_head *bitmap_bh; - struct super_block *sb = ar->inode->i_sb; - struct ext4_sb_info *sbi = EXT4_SB(sb); - ext4_group_t group, nr; - ext4_grpblk_t blkoff; - ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb); - ext4_grpblk_t i = 0; - ext4_fsblk_t goal, block; - struct ext4_super_block *es = EXT4_SB(sb)->s_es; - - goal = ar->goal; - if (goal < le32_to_cpu(es->s_first_data_block) || - goal >= ext4_blocks_count(es)) - goal = le32_to_cpu(es->s_first_data_block); - - ar->len = 0; - ext4_get_group_no_and_offset(sb, goal, &group, &blkoff); - for (nr = ext4_get_groups_count(sb); nr > 0; nr--) { - bitmap_bh = ext4_read_block_bitmap(sb, group); - if (IS_ERR(bitmap_bh)) { - *errp = PTR_ERR(bitmap_bh); - pr_warn("Failed to read block bitmap\n"); - return 0; - } - - while (1) { - i = mb_find_next_zero_bit(bitmap_bh->b_data, max, - blkoff); - if (i >= max) - break; - if (ext4_fc_replay_check_excluded(sb, - ext4_group_first_block_no(sb, group) + - EXT4_C2B(sbi, i))) { - blkoff = i + 1; - } else - break; - } - brelse(bitmap_bh); - if (i < max) - break; - - if (++group >= ext4_get_groups_count(sb)) - group = 0; - - blkoff = 0; - } - - if (i >= max) { - *errp = -ENOSPC; - return 0; - } - - block = ext4_group_first_block_no(sb, group) + EXT4_C2B(sbi, i); - ext4_mb_mark_bb(sb, block, 1, 1); - ar->len = 1; - - return block; -} - static void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block, unsigned long count) {