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authorKemeng Shi <shikemeng@huaweicloud.com>2023-06-03 23:03:15 +0800
committerTheodore Ts'o <tytso@mit.edu>2023-06-15 00:02:10 -0400
commit19a043bb1fd1b5cb2652ca33536c55e6c0a70df0 (patch)
treef9685a5e8330a5dd88e8d644a4b43c6eb59814fc /fs/ext4
parent95a4c3c7e0342f553fed1ac70d10c2efc6bba3b1 (diff)
ext4: try all groups in ext4_mb_new_blocks_simple
ext4_mb_new_blocks_simple ignores the group before goal, so it will fail if free blocks reside in group before goal. Try all groups to avoid unexpected failure. Search finishes either if any free block is found or if no available blocks are found. Simpliy check "i >= max" to distinguish the above cases. Signed-off-by: Kemeng Shi <shikemeng@huaweicloud.com> Suggested-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Link: https://lore.kernel.org/r/20230603150327.3596033-8-shikemeng@huaweicloud.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'fs/ext4')
-rw-r--r--fs/ext4/mballoc.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index 839db9c46aea..bcc9622daa4a 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -6047,7 +6047,7 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
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;
+ ext4_group_t group, nr;
ext4_grpblk_t blkoff;
ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
ext4_grpblk_t i = 0;
@@ -6061,7 +6061,7 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
ar->len = 0;
ext4_get_group_no_and_offset(sb, goal, &group, &blkoff);
- for (; group < ext4_get_groups_count(sb); group++) {
+ 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);
@@ -6085,10 +6085,13 @@ static ext4_fsblk_t ext4_mb_new_blocks_simple(handle_t *handle,
if (i < max)
break;
+ if (++group >= ext4_get_groups_count(sb))
+ group = 0;
+
blkoff = 0;
}
- if (group >= ext4_get_groups_count(sb) || i >= max) {
+ if (i >= max) {
*errp = -ENOSPC;
return 0;
}