Similar to the SB_JOURNAL cleanup that was accepted a while ago, this patch
uses a temporary variable for buffer head references from the bitmap info
array.
This makes the code much more readable in some areas.
It also uses proper reference counting, doing a get_bh() after using the
pointer from the array and brelse()'ing it later. This may seem silly,
but a later patch will replace the simple temporary variables with an
actual read, so the reference freeing will be used then.
fs/reiserfs/bitmap.c | 60 ++++++++++++++++++++++++++++---------------------
fs/reiserfs/resize.c | 62 +++++++++++++++++++++++++++++----------------------
2 files changed, 71 insertions(+), 51 deletions(-)
Signed-off-by: Jeff Mahoney <[email protected]>
diff -ruNpX ../dontdiff linux-2.6.15.orig.staging1/fs/reiserfs/bitmap.c linux-2.6.15.orig.staging2/fs/reiserfs/bitmap.c
--- linux-2.6.15.orig.staging1/fs/reiserfs/bitmap.c 2006-01-16 16:53:29.451263512 -0500
+++ linux-2.6.15.orig.staging2/fs/reiserfs/bitmap.c 2006-01-16 16:53:29.457262600 -0500
@@ -62,6 +62,7 @@ int is_reusable(struct super_block *s, b
{
int i, j;
unsigned int bmap = block >> s->s_blocksize_bits;
+ struct buffer_head *bh;
if (block == 0 || block >= SB_BLOCK_COUNT(s)) {
reiserfs_warning(s,
@@ -99,20 +100,20 @@ int is_reusable(struct super_block *s, b
return 0;
}
- if ((bit_value == 0 &&
- reiserfs_test_le_bit(j, SB_AP_BITMAP(s)[i].bh->b_data)) ||
- (bit_value == 1 &&
- reiserfs_test_le_bit(j, SB_AP_BITMAP(s)[i].bh->b_data) == 0)) {
+ bh = SB_AP_BITMAP(s)[i].bh;
+ get_bh(bh);
+
+ if ((bit_value == 0 && reiserfs_test_le_bit(j, bh->b_data)) ||
+ (bit_value == 1 && reiserfs_test_le_bit(j, bh->b_data) == 0)) {
reiserfs_warning(s,
"vs-4040: is_reusable: corresponding bit of block %lu does not "
"match required value (i==%d, j==%d) test_bit==%d",
- block, i, j, reiserfs_test_le_bit(j,
- SB_AP_BITMAP
- (s)[i].bh->
- b_data));
+ block, i, j, reiserfs_test_le_bit(j, bh->b_data));
+ brelse(bh);
return 0;
}
+ brelse(bh);
if (bit_value == 0 && block == SB_ROOT_BLOCK(s)) {
reiserfs_warning(s,
@@ -154,6 +155,7 @@ static int scan_bitmap_block(struct reis
{
struct super_block *s = th->t_super;
struct reiserfs_bitmap_info *bi = &SB_AP_BITMAP(s)[bmap_n];
+ struct buffer_head *bh;
int end, next;
int org = *beg;
@@ -172,22 +174,27 @@ static int scan_bitmap_block(struct reis
bmap_n);
return 0;
}
+ bh = bi->bh;
+ get_bh(bh);
+
if (buffer_locked(bi->bh)) {
PROC_INFO_INC(s, scan_bitmap.wait);
- __wait_on_buffer(bi->bh);
+ __wait_on_buffer(bh);
}
while (1) {
- cont:
- if (bi->free_count < min)
+ if (bi->free_count < min) {
+ brelse(bh);
return 0; // No free blocks in this bitmap
+ }
/* search for a first zero bit -- beggining of a window */
*beg = reiserfs_find_next_zero_le_bit
- ((unsigned long *)(bi->bh->b_data), boundary, *beg);
+ ((unsigned long *)(bh->b_data), boundary, *beg);
if (*beg + min > boundary) { /* search for a zero bit fails or the rest of bitmap block
* cannot contain a zero window of minimum size */
+ brelse(bh);
return 0;
}
@@ -196,7 +203,7 @@ static int scan_bitmap_block(struct reis
/* first zero bit found; we check next bits */
for (end = *beg + 1;; end++) {
if (end >= *beg + max || end >= boundary
- || reiserfs_test_le_bit(end, bi->bh->b_data)) {
+ || reiserfs_test_le_bit(end, bh->b_data)) {
next = end;
break;
}
@@ -210,12 +217,12 @@ static int scan_bitmap_block(struct reis
* (end) points to one bit after the window end */
if (end - *beg >= min) { /* it seems we have found window of proper size */
int i;
- reiserfs_prepare_for_journal(s, bi->bh, 1);
+ reiserfs_prepare_for_journal(s, bh, 1);
/* try to set all blocks used checking are they still free */
for (i = *beg; i < end; i++) {
/* It seems that we should not check in journal again. */
if (reiserfs_test_and_set_le_bit
- (i, bi->bh->b_data)) {
+ (i, bh->b_data)) {
/* bit was set by another process
* while we slept in prepare_for_journal() */
PROC_INFO_INC(s, scan_bitmap.stolen);
@@ -227,17 +234,15 @@ static int scan_bitmap_block(struct reis
/* otherwise we clear all bit were set ... */
while (--i >= *beg)
reiserfs_test_and_clear_le_bit
- (i, bi->bh->b_data);
- reiserfs_restore_prepared_buffer(s,
- bi->
- bh);
+ (i, bh->b_data);
+ reiserfs_restore_prepared_buffer(s, bh);
*beg = org;
/* ... and search again in current block from beginning */
- goto cont;
+ continue;
}
}
bi->free_count -= (end - *beg);
- journal_mark_dirty(th, s, bi->bh);
+ journal_mark_dirty(th, s, bh);
/* free block count calculation */
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s),
@@ -245,6 +250,7 @@ static int scan_bitmap_block(struct reis
PUT_SB_FREE_BLOCKS(s, SB_FREE_BLOCKS(s) - (end - *beg));
journal_mark_dirty(th, s, SB_BUFFER_WITH_SB(s));
+ brelse(bh);
return end - (*beg);
} else {
*beg = next;
@@ -386,7 +392,7 @@ static void _reiserfs_free_block(struct
{
struct super_block *s = th->t_super;
struct reiserfs_super_block *rs;
- struct buffer_head *sbh;
+ struct buffer_head *sbh, *bmbh;
struct reiserfs_bitmap_info *apbi;
int nr, offset;
@@ -407,16 +413,20 @@ static void _reiserfs_free_block(struct
return;
}
- reiserfs_prepare_for_journal(s, apbi[nr].bh, 1);
+ bmbh = apbi[nr].bh;
+ get_bh(bmbh);
+
+ reiserfs_prepare_for_journal(s, bmbh, 1);
/* clear bit for the given block in bit map */
- if (!reiserfs_test_and_clear_le_bit(offset, apbi[nr].bh->b_data)) {
+ if (!reiserfs_test_and_clear_le_bit(offset, bmbh->b_data)) {
reiserfs_warning(s, "vs-4080: reiserfs_free_block: "
"free_block (%s:%lu)[dev:blocknr]: bit already cleared",
reiserfs_bdevname(s), block);
}
apbi[nr].free_count++;
- journal_mark_dirty(th, s, apbi[nr].bh);
+ journal_mark_dirty(th, s, bmbh);
+ brelse(bmbh);
reiserfs_prepare_for_journal(s, sbh, 1);
/* update super block */
diff -ruNpX ../dontdiff linux-2.6.15.orig.staging1/fs/reiserfs/resize.c linux-2.6.15.orig.staging2/fs/reiserfs/resize.c
--- linux-2.6.15.orig.staging1/fs/reiserfs/resize.c 2006-01-02 22:21:10.000000000 -0500
+++ linux-2.6.15.orig.staging2/fs/reiserfs/resize.c 2006-01-16 16:53:29.471260472 -0500
@@ -22,6 +22,7 @@ int reiserfs_resize(struct super_block *
int err = 0;
struct reiserfs_super_block *sb;
struct reiserfs_bitmap_info *bitmap;
+ struct reiserfs_bitmap_info *info;
struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
struct buffer_head *bh;
struct reiserfs_transaction_handle th;
@@ -127,16 +128,19 @@ int reiserfs_resize(struct super_block *
* transaction begins, and the new bitmaps don't matter if the
* transaction fails. */
for (i = bmap_nr; i < bmap_nr_new; i++) {
- bitmap[i].bh = sb_getblk(s, i * s->s_blocksize * 8);
- memset(bitmap[i].bh->b_data, 0, sb_blocksize(sb));
- reiserfs_test_and_set_le_bit(0, bitmap[i].bh->b_data);
-
- set_buffer_uptodate(bitmap[i].bh);
- mark_buffer_dirty(bitmap[i].bh);
- sync_dirty_buffer(bitmap[i].bh);
+ bh = sb_getblk(s, i * s->s_blocksize * 8);
+ get_bh(bh);
+ memset(bh->b_data, 0, sb_blocksize(sb));
+ reiserfs_test_and_set_le_bit(0, bh->b_data);
+
+ set_buffer_uptodate(bh);
+ mark_buffer_dirty(bh);
+ sync_dirty_buffer(bh);
// update bitmap_info stuff
bitmap[i].first_zero_hint = 1;
bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
+ bitmap[i].bh = bh;
+ brelse(bh);
}
/* free old bitmap blocks array */
SB_AP_BITMAP(s) = bitmap;
@@ -150,30 +154,36 @@ int reiserfs_resize(struct super_block *
if (err)
return err;
- /* correct last bitmap blocks in old and new disk layout */
- reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr - 1].bh, 1);
- for (i = block_r; i < s->s_blocksize * 8; i++)
- reiserfs_test_and_clear_le_bit(i,
- SB_AP_BITMAP(s)[bmap_nr -
- 1].bh->b_data);
- SB_AP_BITMAP(s)[bmap_nr - 1].free_count += s->s_blocksize * 8 - block_r;
- if (!SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint)
- SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint = block_r;
+ /* Extend old last bitmap block - new blocks have been made available */
+ info = SB_AP_BITMAP(s) + bmap_nr - 1;
+ bh = info->bh;
+ get_bh(bh);
- journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr - 1].bh);
+ reiserfs_prepare_for_journal(s, bh, 1);
+ for (i = block_r; i < s->s_blocksize * 8; i++)
+ reiserfs_test_and_clear_le_bit(i, bh->b_data);
+ info->free_count += s->s_blocksize * 8 - block_r;
+ if (!info->first_zero_hint)
+ info->first_zero_hint = block_r;
+
+ journal_mark_dirty(&th, s, bh);
+ brelse(bh);
+
+ /* Correct new last bitmap block - It may not be full */
+ info = SB_AP_BITMAP(s) + bmap_nr_new - 1;
+ bh = info->bh;
+ get_bh(bh);
- reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr_new - 1].bh, 1);
+ reiserfs_prepare_for_journal(s, bh, 1);
for (i = block_r_new; i < s->s_blocksize * 8; i++)
- reiserfs_test_and_set_le_bit(i,
- SB_AP_BITMAP(s)[bmap_nr_new -
- 1].bh->b_data);
- journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr_new - 1].bh);
+ reiserfs_test_and_set_le_bit(i, bh->b_data);
+ journal_mark_dirty(&th, s, bh);
+ brelse(bh);
- SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count -=
- s->s_blocksize * 8 - block_r_new;
+ info->free_count -= s->s_blocksize * 8 - block_r_new;
/* Extreme case where last bitmap is the only valid block in itself. */
- if (!SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count)
- SB_AP_BITMAP(s)[bmap_nr_new - 1].first_zero_hint = 0;
+ if (!info->free_count)
+ info->first_zero_hint = 0;
/* update super */
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
free_blocks = SB_FREE_BLOCKS(s);
--
Jeff Mahoney
SuSE Labs
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