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Date: Sun, 20 Mar 2011 12:26:57 +0200
From: Amir Goldstein <amir73il@...il.com>
To: "Theodore Ts'o" <tytso@....edu>
Cc: linux-ext4@...r.kernel.org
Subject: Re: [PATCH, RFC 03/12] ext4: Convert instances of EXT4_BLOCKS_PER_GROUP
to EXT4_CLUSTERS_PER_GROUP
On Sat, Mar 19, 2011 at 11:28 PM, Theodore Ts'o <tytso@....edu> wrote:
> Change the places in fs/ext4/mballoc.c where EXT4_BLOCKS_PER_GROUP are
> used to indicate the number of bits in a block bitmap (which is really
> a cluster allocation bitmap in bigalloc file systems). There are
> still some places in the ext4 codebase where usage of
> EXT4_BLOCKS_PER_GROUP needs to be audited/fixed, in code paths that
> aren't used given the initial restricted assumptions for bigalloc.
> These will need to be fixed before we can relax those restrictions.
>
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
> fs/ext4/mballoc.c | 34 +++++++++++++++++-----------------
> 1 files changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 2f6f0dd..02f099f 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -651,7 +651,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb,
> ext4_grpblk_t chunk;
> unsigned short border;
>
> - BUG_ON(len > EXT4_BLOCKS_PER_GROUP(sb));
> + BUG_ON(len > EXT4_CLUSTERS_PER_GROUP(sb));
>
> border = 2 << sb->s_blocksize_bits;
>
> @@ -703,7 +703,7 @@ void ext4_mb_generate_buddy(struct super_block *sb,
> void *buddy, void *bitmap, ext4_group_t group)
> {
> struct ext4_group_info *grp = ext4_get_group_info(sb, group);
> - ext4_grpblk_t max = EXT4_BLOCKS_PER_GROUP(sb);
> + ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
> ext4_grpblk_t i = 0;
> ext4_grpblk_t first;
> ext4_grpblk_t len;
> @@ -1680,8 +1680,8 @@ static void ext4_mb_measure_extent(struct ext4_allocation_context *ac,
> struct ext4_free_extent *gex = &ac->ac_g_ex;
>
> BUG_ON(ex->fe_len <= 0);
> - BUG_ON(ex->fe_len > EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
> - BUG_ON(ex->fe_start >= EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
> + BUG_ON(ex->fe_len > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb));
> + BUG_ON(ex->fe_start >= EXT4_CLUSTERS_PER_GROUP(ac->ac_sb));
> BUG_ON(ac->ac_status != AC_STATUS_CONTINUE);
>
> ac->ac_found++;
> @@ -1879,8 +1879,8 @@ void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
>
> while (free && ac->ac_status == AC_STATUS_CONTINUE) {
> i = mb_find_next_zero_bit(bitmap,
> - EXT4_BLOCKS_PER_GROUP(sb), i);
> - if (i >= EXT4_BLOCKS_PER_GROUP(sb)) {
> + EXT4_CLUSTERS_PER_GROUP(sb), i);
> + if (i >= EXT4_CLUSTERS_PER_GROUP(sb)) {
> /*
> * IF we have corrupt bitmap, we won't find any
> * free blocks even though group info says we
> @@ -1943,7 +1943,7 @@ void ext4_mb_scan_aligned(struct ext4_allocation_context *ac,
> do_div(a, sbi->s_stripe);
> i = (a * sbi->s_stripe) - first_group_block;
>
> - while (i < EXT4_BLOCKS_PER_GROUP(sb)) {
> + while (i < EXT4_CLUSTERS_PER_GROUP(sb)) {
> if (!mb_test_bit(i, bitmap)) {
> max = mb_find_extent(e4b, 0, i, sbi->s_stripe, &ex);
> if (max >= sbi->s_stripe) {
> @@ -3071,7 +3071,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
> }
> BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
> start > ac->ac_o_ex.fe_logical);
> - BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
> + BUG_ON(size <= 0 || size > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb));
>
> /* now prepare goal request */
>
> @@ -3724,7 +3724,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
> }
>
> if (needed == 0)
> - needed = EXT4_BLOCKS_PER_GROUP(sb) + 1;
> + needed = EXT4_CLUSTERS_PER_GROUP(sb) + 1;
>
> INIT_LIST_HEAD(&list);
> repeat:
> @@ -4039,8 +4039,8 @@ ext4_mb_initialize_context(struct ext4_allocation_context *ac,
> len = ar->len;
>
> /* just a dirty hack to filter too big requests */
> - if (len >= EXT4_BLOCKS_PER_GROUP(sb) - 10)
> - len = EXT4_BLOCKS_PER_GROUP(sb) - 10;
> + if (len >= EXT4_CLUSTERS_PER_GROUP(sb) - 10)
> + len = EXT4_CLUSTERS_PER_GROUP(sb) - 10;
>
> /* start searching from the goal */
> goal = ar->goal;
> @@ -4579,8 +4579,8 @@ do_more:
> * Check to see if we are freeing blocks across a group
> * boundary.
> */
> - if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) {
> - overflow = bit + count - EXT4_BLOCKS_PER_GROUP(sb);
> + if (bit + count > EXT4_CLUSTERS_PER_GROUP(sb)) {
> + overflow = bit + count - EXT4_CLUSTERS_PER_GROUP(sb);
On Sat, Mar 19, 2011 at 11:28 PM, Theodore Ts'o <tytso@....edu> wrote:
> Change the places in fs/ext4/mballoc.c where EXT4_BLOCKS_PER_GROUP are
> used to indicate the number of bits in a block bitmap (which is really
> a cluster allocation bitmap in bigalloc file systems). There are
> still some places in the ext4 codebase where usage of
> EXT4_BLOCKS_PER_GROUP needs to be audited/fixed, in code paths that
> aren't used given the initial restricted assumptions for bigalloc.
> These will need to be fixed before we can relax those restrictions.
>
> Signed-off-by: "Theodore Ts'o" <tytso@....edu>
> ---
> fs/ext4/mballoc.c | 34 +++++++++++++++++-----------------
> 1 files changed, 17 insertions(+), 17 deletions(-)
>
> diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
> index 2f6f0dd..02f099f 100644
> --- a/fs/ext4/mballoc.c
> +++ b/fs/ext4/mballoc.c
> @@ -651,7 +651,7 @@ static void ext4_mb_mark_free_simple(struct super_block *sb,
> ext4_grpblk_t chunk;
> unsigned short border;
>
> - BUG_ON(len > EXT4_BLOCKS_PER_GROUP(sb));
> + BUG_ON(len > EXT4_CLUSTERS_PER_GROUP(sb));
>
> border = 2 << sb->s_blocksize_bits;
>
> @@ -703,7 +703,7 @@ void ext4_mb_generate_buddy(struct super_block *sb,
> void *buddy, void *bitmap, ext4_group_t group)
> {
> struct ext4_group_info *grp = ext4_get_group_info(sb, group);
> - ext4_grpblk_t max = EXT4_BLOCKS_PER_GROUP(sb);
> + ext4_grpblk_t max = EXT4_CLUSTERS_PER_GROUP(sb);
> ext4_grpblk_t i = 0;
> ext4_grpblk_t first;
> ext4_grpblk_t len;
> @@ -1680,8 +1680,8 @@ static void ext4_mb_measure_extent(struct ext4_allocation_context *ac,
> struct ext4_free_extent *gex = &ac->ac_g_ex;
>
> BUG_ON(ex->fe_len <= 0);
> - BUG_ON(ex->fe_len > EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
> - BUG_ON(ex->fe_start >= EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
> + BUG_ON(ex->fe_len > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb));
> + BUG_ON(ex->fe_start >= EXT4_CLUSTERS_PER_GROUP(ac->ac_sb));
> BUG_ON(ac->ac_status != AC_STATUS_CONTINUE);
>
> ac->ac_found++;
> @@ -1879,8 +1879,8 @@ void ext4_mb_complex_scan_group(struct ext4_allocation_context *ac,
>
> while (free && ac->ac_status == AC_STATUS_CONTINUE) {
> i = mb_find_next_zero_bit(bitmap,
> - EXT4_BLOCKS_PER_GROUP(sb), i);
> - if (i >= EXT4_BLOCKS_PER_GROUP(sb)) {
> + EXT4_CLUSTERS_PER_GROUP(sb), i);
> + if (i >= EXT4_CLUSTERS_PER_GROUP(sb)) {
> /*
> * IF we have corrupt bitmap, we won't find any
> * free blocks even though group info says we
> @@ -1943,7 +1943,7 @@ void ext4_mb_scan_aligned(struct ext4_allocation_context *ac,
> do_div(a, sbi->s_stripe);
> i = (a * sbi->s_stripe) - first_group_block;
>
> - while (i < EXT4_BLOCKS_PER_GROUP(sb)) {
> + while (i < EXT4_CLUSTERS_PER_GROUP(sb)) {
> if (!mb_test_bit(i, bitmap)) {
> max = mb_find_extent(e4b, 0, i, sbi->s_stripe, &ex);
> if (max >= sbi->s_stripe) {
> @@ -3071,7 +3071,7 @@ ext4_mb_normalize_request(struct ext4_allocation_context *ac,
> }
> BUG_ON(start + size <= ac->ac_o_ex.fe_logical &&
> start > ac->ac_o_ex.fe_logical);
> - BUG_ON(size <= 0 || size > EXT4_BLOCKS_PER_GROUP(ac->ac_sb));
> + BUG_ON(size <= 0 || size > EXT4_CLUSTERS_PER_GROUP(ac->ac_sb));
>
> /* now prepare goal request */
>
> @@ -3724,7 +3724,7 @@ ext4_mb_discard_group_preallocations(struct super_block *sb,
> }
>
> if (needed == 0)
> - needed = EXT4_BLOCKS_PER_GROUP(sb) + 1;
> + needed = EXT4_CLUSTERS_PER_GROUP(sb) + 1;
>
> INIT_LIST_HEAD(&list);
> repeat:
> @@ -4039,8 +4039,8 @@ ext4_mb_initialize_context(struct ext4_allocation_context *ac,
> len = ar->len;
>
> /* just a dirty hack to filter too big requests */
> - if (len >= EXT4_BLOCKS_PER_GROUP(sb) - 10)
> - len = EXT4_BLOCKS_PER_GROUP(sb) - 10;
> + if (len >= EXT4_CLUSTERS_PER_GROUP(sb) - 10)
> + len = EXT4_CLUSTERS_PER_GROUP(sb) - 10;
>
> /* start searching from the goal */
> goal = ar->goal;
> @@ -4579,8 +4579,8 @@ do_more:
> * Check to see if we are freeing blocks across a group
> * boundary.
> */
> - if (bit + count > EXT4_BLOCKS_PER_GROUP(sb)) {
> - overflow = bit + count - EXT4_BLOCKS_PER_GROUP(sb);
> + if (bit + count > EXT4_CLUSTERS_PER_GROUP(sb)) {
> + overflow = bit + count - EXT4_CLUSTERS_PER_GROUP(sb);
If I am not mistaken, while 'bit' was already converted to cluster units,
'count' is still in block units.
I think ext4_free_blocks() need to do 2 things:
1. convert 'count' to clusters (after issuing journal_forget())
2. round 'bit' up (and round 'count' down) if start block is not
on cluster boundary, so truncate/punch hole, will not free a
cluster when it's 'base' block is still allocated.
> count -= overflow;
> }
> bitmap_bh = ext4_read_block_bitmap(sb, block_group);
> @@ -4844,7 +4844,7 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
> minlen = range->minlen >> sb->s_blocksize_bits;
> trimmed = 0;
>
> - if (unlikely(minlen > EXT4_BLOCKS_PER_GROUP(sb)))
> + if (unlikely(minlen > EXT4_CLUSTERS_PER_GROUP(sb)))
> return -EINVAL;
> if (start < first_data_blk) {
> len -= first_data_blk - start;
> @@ -4857,7 +4857,7 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
> ext4_get_group_no_and_offset(sb, (ext4_fsblk_t) (start + len),
> &last_group, &last_block);
> last_group = (last_group > ngroups - 1) ? ngroups - 1 : last_group;
> - last_block = EXT4_BLOCKS_PER_GROUP(sb);
> + last_block = EXT4_CLUSTERS_PER_GROUP(sb);
>
> if (first_group > last_group)
> return -EINVAL;
> @@ -4870,8 +4870,8 @@ int ext4_trim_fs(struct super_block *sb, struct fstrim_range *range)
> break;
> }
>
> - if (len >= EXT4_BLOCKS_PER_GROUP(sb))
> - len -= (EXT4_BLOCKS_PER_GROUP(sb) - first_block);
> + if (len >= EXT4_CLUSTERS_PER_GROUP(sb))
> + len -= (EXT4_CLUSTERS_PER_GROUP(sb) - first_block);
> else
> last_block = first_block + len;
>
> --
> 1.7.3.1
>
> --
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