Previously, ext4_mb_mark_context is only called under fast commit
replay path, so there is no valid handle when we update block bitmap
and group descriptor. This patch try to extend ext4_mb_mark_context
to be used by code under journal. There are several improvement:
1. Add "handle_t *handle" to struct ext4_mark_context to journal block
bitmap and group descriptor update inside ext4_mb_mark_context (the
added journal code is based on ext4_mb_mark_diskspace_used where
ext4_mb_mark_context is going to be used.)
2. Adds a flag argument to ext4_mb_mark_context() which controls
a. EXT4_MB_BITMAP_MARKED_CHECK - whether block bitmap checking is needed.
b. EXT4_MB_SYNC_UPDATE - whether dirty buffers (bitmap and group
descriptor) needs sync.
Signed-off-by: Kemeng Shi <shikemeng@xxxxxxxxxxxxxxx>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
---
fs/ext4/mballoc.c | 64 ++++++++++++++++++++++++++++++++++++-----------
1 file changed, 49 insertions(+), 15 deletions(-)
diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index f50f6fa5e65c..b3e418c0f3d5 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -3953,26 +3953,47 @@ void ext4_exit_mballoc(void)
ext4_groupinfo_destroy_slabs();
}
+#define EXT4_MB_BITMAP_MARKED_CHECK 0x0001
+#define EXT4_MB_SYNC_UPDATE 0x0002
static int
-ext4_mb_mark_context(struct super_block *sb, bool state, ext4_group_t group,
- ext4_grpblk_t blkoff, ext4_grpblk_t len)
+ext4_mb_mark_context(handle_t *handle, struct super_block *sb, bool state,
+ ext4_group_t group, ext4_grpblk_t blkoff,
+ ext4_grpblk_t len, int flags, ext4_grpblk_t *ret_changed)
{
struct ext4_sb_info *sbi = EXT4_SB(sb);
struct buffer_head *bitmap_bh = NULL;
struct ext4_group_desc *gdp;
struct buffer_head *gdp_bh;
int err;
- unsigned int i, already, changed;
+ unsigned int i, already, changed = len;
+ if (ret_changed)
+ *ret_changed = 0;
bitmap_bh = ext4_read_block_bitmap(sb, group);
if (IS_ERR(bitmap_bh))
return PTR_ERR(bitmap_bh);
+ if (handle) {
+ BUFFER_TRACE(bitmap_bh, "getting write access");
+ err = ext4_journal_get_write_access(handle, sb, bitmap_bh,
+ EXT4_JTR_NONE);
+ if (err)
+ goto out_err;
+ }
+
err = -EIO;
gdp = ext4_get_group_desc(sb, group, &gdp_bh);
if (!gdp)
goto out_err;
+ if (handle) {
+ BUFFER_TRACE(gdp_bh, "get_write_access");
+ err = ext4_journal_get_write_access(handle, sb, gdp_bh,
+ EXT4_JTR_NONE);
+ if (err)
+ goto out_err;
+ }
+
ext4_lock_group(sb, group);
if (ext4_has_group_desc_csum(sb) &&
(gdp->bg_flags & cpu_to_le16(EXT4_BG_BLOCK_UNINIT))) {
@@ -3981,12 +4002,14 @@ ext4_mb_mark_context(struct super_block *sb, bool state, ext4_group_t group,
ext4_free_clusters_after_init(sb, group, gdp));
}
- already = 0;
- for (i = 0; i < len; i++)
- if (mb_test_bit(blkoff + i, bitmap_bh->b_data) ==
- state)
- already++;
- changed = len - already;
+ if (flags & EXT4_MB_BITMAP_MARKED_CHECK) {
+ already = 0;
+ for (i = 0; i < len; i++)
+ if (mb_test_bit(blkoff + i, bitmap_bh->b_data) ==
+ state)
+ already++;
+ changed = len - already;
+ }
if (state) {
mb_set_bits(bitmap_bh->b_data, blkoff, len);
@@ -4001,6 +4024,8 @@ ext4_mb_mark_context(struct super_block *sb, bool state, ext4_group_t group,
ext4_block_bitmap_csum_set(sb, gdp, bitmap_bh);
ext4_group_desc_csum_set(sb, group, gdp);
ext4_unlock_group(sb, group);
+ if (ret_changed)
+ *ret_changed = changed;
if (sbi->s_log_groups_per_flex) {
ext4_group_t flex_group = ext4_flex_group(sbi, group);
@@ -4013,15 +4038,17 @@ ext4_mb_mark_context(struct super_block *sb, bool state, ext4_group_t group,
atomic64_add(changed, &fg->free_clusters);
}
- err = ext4_handle_dirty_metadata(NULL, NULL, bitmap_bh);
+ err = ext4_handle_dirty_metadata(handle, NULL, bitmap_bh);
if (err)
goto out_err;
- err = ext4_handle_dirty_metadata(NULL, NULL, gdp_bh);
+ err = ext4_handle_dirty_metadata(handle, NULL, gdp_bh);
if (err)
goto out_err;
- sync_dirty_buffer(bitmap_bh);
- sync_dirty_buffer(gdp_bh);
+ if (flags & EXT4_MB_SYNC_UPDATE) {
+ sync_dirty_buffer(bitmap_bh);
+ sync_dirty_buffer(gdp_bh);
+ }
out_err:
brelse(bitmap_bh);
@@ -4181,7 +4208,11 @@ void ext4_mb_mark_bb(struct super_block *sb, ext4_fsblk_t block,
break;
}
- err = ext4_mb_mark_context(sb, state, group, blkoff, clen);
+ err = ext4_mb_mark_context(NULL, sb, state,
+ group, blkoff, clen,
+ EXT4_MB_BITMAP_MARKED_CHECK |
+ EXT4_MB_SYNC_UPDATE,
+ NULL);
if (err)
break;
@@ -6398,7 +6429,10 @@ static void ext4_free_blocks_simple(struct inode *inode, ext4_fsblk_t block,
ext4_grpblk_t blkoff;
ext4_get_group_no_and_offset(sb, block, &group, &blkoff);
- ext4_mb_mark_context(sb, false, group, blkoff, count);
+ ext4_mb_mark_context(NULL, sb, false, group, blkoff, count,
+ EXT4_MB_BITMAP_MARKED_CHECK |
+ EXT4_MB_SYNC_UPDATE,
+ NULL);
}
/**
--
2.30.0
