# This is a BitKeeper generated patch for the following project:

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher.
# This patch includes the following deltas:
# ChangeSet 1.747 -> 1.748
# fs/reiserfs/namei.c 1.23 -> 1.24
# fs/reiserfs/journal.c 1.22 -> 1.23
# fs/reiserfs/hashes.c 1.4 -> 1.5
# include/linux/reiserfs_fs_i.h 1.7 -> 1.8
# fs/reiserfs/procfs.c 1.5 -> 1.6
# fs/reiserfs/fix_node.c 1.16 -> 1.17
# fs/reiserfs/inode.c 1.34 -> 1.35
# include/linux/reiserfs_fs.h 1.20 -> 1.21
# fs/reiserfs/resize.c 1.5 -> 1.6
# fs/reiserfs/super.c 1.19 -> 1.20
# include/linux/reiserfs_fs_sb.h 1.11 -> 1.12
# fs/reiserfs/bitmap.c 1.14 -> 1.15
# fs/reiserfs/stree.c 1.19 -> 1.20
#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 02/08/09 [email protected] 1.748
# Many files:
# Merged in new block allocator support, and one more tail policy (shorter tails)
# --------------------------------------------
#
diff -Nru a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c
--- a/fs/reiserfs/bitmap.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/bitmap.c Fri Aug 9 19:31:45 2002
@@ -1,26 +1,70 @@
/*
* Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README
*/
+
+/* Reiserfs block (de)allocator, bitmap-based. */

#include <linux/config.h>
#include <linux/sched.h>
-#include <linux/reiserfs_fs.h>
+#include <linux/vmalloc.h>
+#include <linux/errno.h>
#include <linux/locks.h>
-#include <asm/bitops.h>
-#include <linux/list.h>
+#include <linux/kernel.h>

-#ifdef CONFIG_REISERFS_CHECK
+#include <linux/reiserfs_fs.h>
+#include <linux/reiserfs_fs_sb.h>
+#include <linux/reiserfs_fs_i.h>
+
+#define PREALLOCATION_SIZE 8
+
+#define INODE_INFO(inode) (&(inode)->u.reiserfs_i)
+
+/* different reiserfs block allocator options */
+
+#define SB_ALLOC_OPTS(s) ((s)->u.reiserfs_sb.s_alloc_options.bits)
+
+#define _ALLOC_concentrating_formatted_nodes 0
+#define _ALLOC_displacing_large_files 1
+#define _ALLOC_displacing_new_packing_localities 2
+#define _ALLOC_old_hashed_relocation 3
+#define _ALLOC_new_hashed_relocation 4
+#define _ALLOC_skip_busy 5
+#define _ALLOC_displace_based_on_dirid 6
+#define _ALLOC_hashed_formatted_nodes 7
+#define _ALLOC_old_way 8
+#define _ALLOC_hundredth_slices 9
+
+#define concentrating_formatted_nodes(s) test_bit(_ALLOC_concentrating_formatted_nodes, &SB_ALLOC_OPTS(s))
+#define displacing_large_files(s) test_bit(_ALLOC_displacing_large_files, &SB_ALLOC_OPTS(s))
+#define displacing_new_packing_localities(s) test_bit(_ALLOC_displacing_new_packing_localities, &SB_ALLOC_OPTS(s))
+
+#define SET_OPTION(optname) \
+ do { \
+ reiserfs_warning("reiserfs: option \"%s\" is set\n", #optname); \
+ set_bit(_ALLOC_ ## optname , &SB_ALLOC_OPTS(s)); \
+ } while(0)
+#define TEST_OPTION(optname, s) \
+ test_bit(_ALLOC_ ## optname , &SB_ALLOC_OPTS(s))
+
+
+/* #define LIMIT(a,b) do { if ((a) > (b)) (a) = (b); } while(0) */
+
+static inline void get_bit_address (struct super_block * s,
+ unsigned long block, int * bmap_nr, int * offset)
+{
+ /* It is in the bitmap block number equal to the block
+ * number divided by the number of bits in a block. */
+ *bmap_nr = block / (s->s_blocksize << 3);
+ /* Within that bitmap block it is located at bit offset *offset. */
+ *offset = block & ((s->s_blocksize << 3) - 1 );
+ return;
+}

-/* this is a safety check to make sure
-** blocks are reused properly. used for debugging only.
-**
-** this checks, that block can be reused, and it has correct state
-** (free or busy)
-*/
+#ifdef CONFIG_REISERFS_CHECK
int is_reusable (struct super_block * s, unsigned long block, int bit_value)
{
int i, j;
-
+
if (block == 0 || block >= SB_BLOCK_COUNT (s)) {
reiserfs_warning ("vs-4010: is_reusable: block number is out of range %lu (%u)\n",
block, SB_BLOCK_COUNT (s));
@@ -29,104 +73,266 @@

/* it can't be one of the bitmap blocks */
for (i = 0; i < SB_BMAP_NR (s); i ++)
- if (block == SB_AP_BITMAP (s)[i]->b_blocknr) {
+ if (block == SB_AP_BITMAP (s)[i].bh->b_blocknr) {
reiserfs_warning ("vs: 4020: is_reusable: "
"bitmap block %lu(%u) can't be freed or reused\n",
block, SB_BMAP_NR (s));
return 0;
}

- i = block / (s->s_blocksize << 3);
+ get_bit_address (s, block, &i, &j);
+
if (i >= SB_BMAP_NR (s)) {
reiserfs_warning ("vs-4030: is_reusable: there is no so many bitmap blocks: "
"block=%lu, bitmap_nr=%d\n", block, i);
return 0;
}

- j = block % (s->s_blocksize << 3);
if ((bit_value == 0 &&
- reiserfs_test_le_bit(j, SB_AP_BITMAP(s)[i]->b_data)) ||
+ 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]->b_data) == 0)) {
+ reiserfs_test_le_bit(j, SB_AP_BITMAP (s)[i].bh->b_data) == 0)) {
reiserfs_warning ("vs-4040: is_reusable: corresponding bit of block %lu does not "
"match required value (i==%d, j==%d) test_bit==%d\n",
- block, i, j, reiserfs_test_le_bit (j, SB_AP_BITMAP (s)[i]->b_data));
+ block, i, j, reiserfs_test_le_bit (j, SB_AP_BITMAP (s)[i].bh->b_data));
+
return 0;
}

if (bit_value == 0 && block == SB_ROOT_BLOCK (s)) {
reiserfs_warning ("vs-4050: is_reusable: this is root block (%u), "
- "it must be busy", SB_ROOT_BLOCK (s));
+ "it must be busy\n", SB_ROOT_BLOCK (s));
return 0;
}

return 1;
}
+#endif /* CONFIG_REISERFS_CHECK */

+/* searches in journal structures for a given block number (bmap, off). If block
+ is found in reiserfs journal it suggests next free block candidate to test. */
+static inline int is_block_in_journal (struct super_block * s, int bmap, int off, int *next)
+{
+ unsigned int tmp;

+ if (reiserfs_in_journal (s, s->s_dev, bmap, off, s->s_blocksize, 1, &tmp)) {
+ if (tmp) { /* hint supplied */
+ *next = tmp;
+ PROC_INFO_INC( s, scan_bitmap.in_journal_hint );
+ } else {
+ (*next) = off + 1; /* inc offset to avoid looping. */
+ PROC_INFO_INC( s, scan_bitmap.in_journal_nohint );
+ }
+ PROC_INFO_INC( s, scan_bitmap.retry );
+ return 1;
+ }
+ return 0;
+}

+/* it searches for a window of zero bits with given minimum and maximum lengths in one bitmap
+ * block; */
+static int scan_bitmap_block (struct reiserfs_transaction_handle *th,
+ int bmap_n, int *beg, int boundary, int min, int max, int unfm)
+{
+ struct super_block *s = th->t_super;
+ struct reiserfs_bitmap_info *bi=&SB_AP_BITMAP(s)[bmap_n];
+ int end, next;
+ int org = *beg;
+
+ RFALSE(bmap_n >= SB_BMAP_NR (s), "Bitmap %d is out of range (0..%d)\n",bmap_n, SB_BMAP_NR (s) - 1);
+ PROC_INFO_INC( s, scan_bitmap.bmap );
+/* this is unclear and lacks comments, explain how journal bitmaps
+ work here for the reader. Convey a sense of the design here. What
+ is a window? */
+/* - I mean `a window of zero bits' as in description of this function - Zam. */

-#endif /* CONFIG_REISERFS_CHECK */
+ if ( !bi ) {
+ printk("Hey, bitmap info pointer is zero for bitmap %d!\n",bmap_n);
+ return 0;
+ }
+ if (buffer_locked (bi->bh)) {
+ PROC_INFO_INC( s, scan_bitmap.wait );
+ __wait_on_buffer (bi->bh);
+ }
+
+ /* If we know that first zero bit is only one or first zero bit is
+ closer to the end of bitmap than our start pointer */
+ if (bi->first_zero_hint > *beg || bi->free_count == 1)
+ *beg = bi->first_zero_hint;
+
+ while (1) {
+ cont:
+ if (bi->free_count < min)
+ 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);

-/* get address of corresponding bit (bitmap block number and offset in it) */
-static inline void get_bit_address (struct super_block * s, unsigned long block, int * bmap_nr, int * offset)
-{
- /* It is in the bitmap block number equal to the block number divided by the number of
- bits in a block. */
- *bmap_nr = block / (s->s_blocksize << 3);
- /* Within that bitmap block it is located at bit offset *offset. */
- *offset = block % (s->s_blocksize << 3);
- return;
+ if (*beg + min > boundary) { /* search for a zero bit fails or the rest of bitmap block
+ * cannot contain a zero window of minimum size */
+ return 0;
+ }
+
+ if (unfm && is_block_in_journal(s,bmap_n, *beg, beg))
+ continue;
+ /* 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)) {
+ next = end;
+ break;
+ }
+ /* finding the other end of zero bit window requires looking into journal structures (in
+ * case of searching for free blocks for unformatted nodes) */
+ if (unfm && is_block_in_journal(s, bmap_n, end, &next))
+ break;
+ }
+
+ /* now (*beg) points to beginning of zero bits window,
+ * (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);
+ /* 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)) {
+ /* bit was set by another process
+ * while we slept in prepare_for_journal() */
+ PROC_INFO_INC( s, scan_bitmap.stolen );
+ if (i >= *beg + min) { /* we can continue with smaller set of allocated blocks,
+ * if length of this set is more or equal to `min' */
+ end = i;
+ break;
+ }
+ /* 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);
+ *beg = max(org, (int)bi->first_zero_hint);
+ /* ... and search again in current block from beginning */
+ goto cont;
+ }
+ }
+ bi->free_count -= (end - *beg);
+
+ /* if search started from zero_hint bit, and zero hint have not
+ changed since, then we need to update first_zero_hint */
+ if ( bi->first_zero_hint >= *beg)
+ /* no point in looking for free bit if there is not any */
+ bi->first_zero_hint = (bi->free_count > 0 ) ?
+ reiserfs_find_next_zero_le_bit
+ ((unsigned long*)(bi->bh->b_data), s->s_blocksize << 3, end) : (s->s_blocksize << 3);
+
+ journal_mark_dirty (th, s, bi->bh);
+
+ /* free block count calculation */
+ reiserfs_prepare_for_journal (s, SB_BUFFER_WITH_SB(s), 1);
+ PUT_SB_FREE_BLOCKS(s, SB_FREE_BLOCKS(s) - (end - *beg));
+ journal_mark_dirty (th, s, SB_BUFFER_WITH_SB(s));
+
+ return end - (*beg);
+ } else {
+ *beg = next;
+ }
+ }
}

+/* Tries to find contiguous zero bit window (given size) in given region of
+ * bitmap and place new blocks there. Returns number of allocated blocks. */
+static int scan_bitmap (struct reiserfs_transaction_handle *th,
+ unsigned long *start, unsigned long finish,
+ int min, int max, int unfm, unsigned long file_block)
+{
+ int nr_allocated=0;
+ struct super_block * s = th->t_super;
+ /* find every bm and bmap and bmap_nr in this file, and change them all to bitmap_blocknr
+ * - Hans, it is not a block number - Zam. */
+
+ int bm, off;
+ int end_bm, end_off;
+ int off_max = s->s_blocksize << 3;
+
+ PROC_INFO_INC( s, scan_bitmap.call );
+ if ( SB_FREE_BLOCKS(s) <= 0)
+ return 0; // No point in looking for more free blocks
+
+ get_bit_address (s, *start, &bm, &off);
+ get_bit_address (s, finish, &end_bm, &end_off);
+
+ // With this option set first we try to find a bitmap that is at least 10%
+ // free, and if that fails, then we fall back to old whole bitmap scanning
+ if ( TEST_OPTION(skip_busy, s) && SB_FREE_BLOCKS(s) > SB_BLOCK_COUNT(s)/20 ) {
+ for (;bm < end_bm; bm++, off = 0) {
+ if ( ( off && (!unfm || (file_block != 0))) || SB_AP_BITMAP(s)[bm].free_count > (s->s_blocksize << 3) / 10 )
+ nr_allocated = scan_bitmap_block(th, bm, &off, off_max, min, max, unfm);
+ if (nr_allocated)
+ goto ret;
+ }
+ get_bit_address (s, *start, &bm, &off);
+ }
+
+ for (;bm < end_bm; bm++, off = 0) {
+ nr_allocated = scan_bitmap_block(th, bm, &off, off_max, min, max, unfm);
+ if (nr_allocated)
+ goto ret;
+ }
+
+ nr_allocated = scan_bitmap_block(th, bm, &off, end_off + 1, min, max, unfm);

-/* There would be a modest performance benefit if we write a version
- to free a list of blocks at once. -Hans */
- /* I wonder if it would be less modest
- now that we use journaling. -Hans */
-static void _reiserfs_free_block (struct reiserfs_transaction_handle *th, unsigned long block)
+ ret:
+ *start = bm * off_max + off;
+ return nr_allocated;
+
+}
+
+static void _reiserfs_free_block (struct reiserfs_transaction_handle *th,
+ b_blocknr_t block)
{
struct super_block * s = th->t_super;
struct reiserfs_super_block * rs;
struct buffer_head * sbh;
- struct buffer_head ** apbh;
+ struct reiserfs_bitmap_info *apbi;
int nr, offset;

- PROC_INFO_INC( s, free_block );
-
- rs = SB_DISK_SUPER_BLOCK (s);
- sbh = SB_BUFFER_WITH_SB (s);
- apbh = SB_AP_BITMAP (s);
-
- get_bit_address (s, block, &nr, &offset);
-
- if (nr >= sb_bmap_nr (rs)) {
- reiserfs_warning ("vs-4075: reiserfs_free_block: "
- "block %lu is out of range on %s\n",
- block, bdevname(s->s_dev));
- return;
- }
-
- reiserfs_prepare_for_journal(s, apbh[nr], 1 ) ;
-
- /* clear bit for the given block in bit map */
- if (!reiserfs_test_and_clear_le_bit (offset, apbh[nr]->b_data)) {
- reiserfs_warning ("vs-4080: reiserfs_free_block: "
- "free_block (%04x:%lu)[dev:blocknr]: bit already cleared\n",
- s->s_dev, block);
- }
- journal_mark_dirty (th, s, apbh[nr]);
+ PROC_INFO_INC( s, free_block );

- reiserfs_prepare_for_journal(s, sbh, 1) ;
- /* update super block */
- set_sb_free_blocks( rs, sb_free_blocks(rs) + 1 );
+ rs = SB_DISK_SUPER_BLOCK (s);
+ sbh = SB_BUFFER_WITH_SB (s);
+ apbi = SB_AP_BITMAP(s);
+
+ get_bit_address (s, block, &nr, &offset);
+
+ if (nr >= sb_bmap_nr (rs)) {
+ reiserfs_warning ("vs-4075: reiserfs_free_block: "
+ "block %lu is out of range on %s\n",
+ block, bdevname(s->s_dev));
+ return;
+ }

- journal_mark_dirty (th, s, sbh);
- s->s_dirt = 1;
+ reiserfs_prepare_for_journal(s, apbi[nr].bh, 1 ) ;
+
+ /* clear bit for the given block in bit map */
+ if (!reiserfs_test_and_clear_le_bit (offset, apbi[nr].bh->b_data)) {
+ reiserfs_warning ("vs-4080: reiserfs_free_block: "
+ "free_block (%04x:%lu)[dev:blocknr]: bit already cleared\n",
+ s->s_dev, block);
+ }
+ if (offset < apbi[nr].first_zero_hint) {
+ apbi[nr].first_zero_hint = offset;
+ }
+ apbi[nr].free_count ++;
+ journal_mark_dirty (th, s, apbi[nr].bh);
+
+ reiserfs_prepare_for_journal(s, sbh, 1) ;
+ /* update super block */
+ set_sb_free_blocks( rs, sb_free_blocks(rs) + 1 );
+
+ journal_mark_dirty (th, s, sbh);
}

-void reiserfs_free_block (struct reiserfs_transaction_handle *th,
- unsigned long block) {
+void reiserfs_free_block (struct reiserfs_transaction_handle *th,
+ unsigned long block) {
struct super_block * s = th->t_super;

RFALSE(!s, "vs-4061: trying to free block on nonexistent device");
@@ -144,565 +350,558 @@
_reiserfs_free_block(th, block) ;
}

-/* beginning from offset-th bit in bmap_nr-th bitmap block,
- find_forward finds the closest zero bit. It returns 1 and zero
- bit address (bitmap, offset) if zero bit found or 0 if there is no
- zero bit in the forward direction */
-/* The function is NOT SCHEDULE-SAFE! */
-static int find_forward (struct super_block * s, int * bmap_nr, int * offset, int for_unformatted)
-{
- int i, j;
- struct buffer_head * bh;
- unsigned long block_to_try = 0;
- unsigned long next_block_to_try = 0 ;
-
- PROC_INFO_INC( s, find_forward.call );
-
- for (i = *bmap_nr; i < SB_BMAP_NR (s); i ++, *offset = 0,
- PROC_INFO_INC( s, find_forward.bmap )) {
- /* get corresponding bitmap block */
- bh = SB_AP_BITMAP (s)[i];
- if (buffer_locked (bh)) {
- PROC_INFO_INC( s, find_forward.wait );
- __wait_on_buffer (bh);
- }
-retry:
- j = reiserfs_find_next_zero_le_bit ((unsigned long *)bh->b_data,
- s->s_blocksize << 3, *offset);
-
- /* wow, this really needs to be redone. We can't allocate a block if
- ** it is in the journal somehow. reiserfs_in_journal makes a suggestion
- ** for a good block if the one you ask for is in the journal. Note,
- ** reiserfs_in_journal might reject the block it suggests. The big
- ** gain from the suggestion is when a big file has been deleted, and
- ** many blocks show free in the real bitmap, but are all not free
- ** in the journal list bitmaps.
- **
- ** this whole system sucks. The bitmaps should reflect exactly what
- ** can and can't be allocated, and the journal should update them as
- ** it goes. TODO.
- */
- if (j < (s->s_blocksize << 3)) {
- block_to_try = (i * (s->s_blocksize << 3)) + j;
-
- /* the block is not in the journal, we can proceed */
- if (!(reiserfs_in_journal(s, s->s_dev, block_to_try, s->s_blocksize, for_unformatted, &next_block_to_try))) {
- *bmap_nr = i;
- *offset = j;
- return 1;
- }
- /* the block is in the journal */
- else if ((j+1) < (s->s_blocksize << 3)) { /* try again */
- /* reiserfs_in_journal suggested a new block to try */
- if (next_block_to_try > 0) {
- int new_i ;
- get_bit_address (s, next_block_to_try, &new_i, offset);
-
- PROC_INFO_INC( s, find_forward.in_journal_hint );
-
- /* block is not in this bitmap. reset i and continue
- ** we only reset i if new_i is in a later bitmap.
- */
- if (new_i > i) {
- i = (new_i - 1 ); /* i gets incremented by the for loop */
- PROC_INFO_INC( s, find_forward.in_journal_out );
- continue ;
- }
- } else {
- /* no suggestion was made, just try the next block */
- *offset = j+1 ;
- }
- PROC_INFO_INC( s, find_forward.retry );
- goto retry ;
- }
+static void __discard_prealloc (struct reiserfs_transaction_handle * th,
+ struct inode * inode)
+{
+ unsigned long save = inode->u.reiserfs_i.i_prealloc_block ;
+#ifdef CONFIG_REISERFS_CHECK
+ if (inode->u.reiserfs_i.i_prealloc_count < 0)
+ reiserfs_warning("zam-4001:%s: inode has negative prealloc blocks count.\n", __FUNCTION__ );
+#endif
+ while (inode->u.reiserfs_i.i_prealloc_count > 0) {
+ reiserfs_free_prealloc_block(th,inode->u.reiserfs_i.i_prealloc_block);
+ inode->u.reiserfs_i.i_prealloc_block++;
+ inode->u.reiserfs_i.i_prealloc_count --;
}
- }
- /* zero bit not found */
- return 0;
+ inode->u.reiserfs_i.i_prealloc_block = save ;
+ list_del (&(inode->u.reiserfs_i.i_prealloc_list));
}

-/* return 0 if no free blocks, else return 1 */
-/* The function is NOT SCHEDULE-SAFE!
-** because the bitmap block we want to change could be locked, and on its
-** way to the disk when we want to read it, and because of the
-** flush_async_commits. Per bitmap block locks won't help much, and
-** really aren't needed, as we retry later on if we try to set the bit
-** and it is already set.
-*/
-static int find_zero_bit_in_bitmap (struct super_block * s,
- unsigned long search_start,
- int * bmap_nr, int * offset,
- int for_unformatted)
-{
- int retry_count = 0 ;
- /* get bit location (bitmap number and bit offset) of search_start block */
- get_bit_address (s, search_start, bmap_nr, offset);
-
- /* note that we search forward in the bitmap, benchmarks have shown that it is better to allocate in increasing
- sequence, which is probably due to the disk spinning in the forward direction.. */
- if (find_forward (s, bmap_nr, offset, for_unformatted) == 0) {
- /* there wasn't a free block with number greater than our
- starting point, so we are going to go to the beginning of the disk */
-
-retry:
- search_start = 0; /* caller will reset search_start for itself also. */
- get_bit_address (s, search_start, bmap_nr, offset);
- if (find_forward (s, bmap_nr,offset,for_unformatted) == 0) {
- if (for_unformatted) { /* why only unformatted nodes? -Hans */
- if (retry_count == 0) {
- /* we've got a chance that flushing async commits will free up
- ** some space. Sync then retry
- */
- flush_async_commits(s) ;
- retry_count++ ;
- goto retry ;
- } else if (retry_count > 0) {
- /* nothing more we can do. Make the others wait, flush
- ** all log blocks to disk, and flush to their home locations.
- ** this will free up any blocks held by the journal
- */
- SB_JOURNAL(s)->j_must_wait = 1 ;
- }
- }
- return 0;
- }
+/* FIXME: It should be inline function */
+void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th,
+ struct inode * inode)
+{
+ if (inode->u.reiserfs_i.i_prealloc_count) {
+ __discard_prealloc(th, inode);
}
- return 1;
}

-/* get amount_needed free block numbers from scanning the bitmap of
- free/used blocks.
-
- Optimize layout by trying to find them starting from search_start
- and moving in increasing blocknr direction. (This was found to be
- faster than using a bi-directional elevator_direction, in part
- because of disk spin direction, in part because by the time one
- reaches the end of the disk the beginning of the disk is the least
- congested).
-
- search_start is the block number of the left
- semantic neighbor of the node we create.
-
- return CARRY_ON if everything is ok
- return NO_DISK_SPACE if out of disk space
- return NO_MORE_UNUSED_CONTIGUOUS_BLOCKS if the block we found is not contiguous to the last one
-
- return block numbers found, in the array free_blocknrs. assumes
- that any non-zero entries already present in the array are valid.
- This feature is perhaps convenient coding when one might not have
- used all blocknrs from the last time one called this function, or
- perhaps it is an archaism from the days of schedule tracking, one
- of us ought to reread the code that calls this, and analyze whether
- it is still the right way to code it.
-
- spare space is used only when priority is set to 1. reiserfsck has
- its own reiserfs_new_blocknrs, which can use reserved space
-
- exactly what reserved space? the SPARE_SPACE? if so, please comment reiserfs.h.
-
- Give example of who uses spare space, and say that it is a deadlock
- avoidance mechanism. -Hans */
-
-/* This function is NOT SCHEDULE-SAFE! */
-
-static int do_reiserfs_new_blocknrs (struct reiserfs_transaction_handle *th,
- unsigned long * free_blocknrs,
- unsigned long search_start,
- int amount_needed, int priority,
- int for_unformatted,
- int for_prealloc)
-{
- struct super_block * s = th->t_super;
- int i, j;
- unsigned long * block_list_start = free_blocknrs;
- int init_amount_needed = amount_needed;
- unsigned long new_block = 0 ;
-
- if (SB_FREE_BLOCKS (s) < SPARE_SPACE && !priority)
- /* we can answer NO_DISK_SPACE being asked for new block with
- priority 0 */
- return NO_DISK_SPACE;
-
- RFALSE( !s, "vs-4090: trying to get new block from nonexistent device");
- RFALSE( search_start == MAX_B_NUM,
- "vs-4100: we are optimizing location based on "
- "the bogus location of a temp buffer (%lu).", search_start);
- RFALSE( amount_needed < 1 || amount_needed > 2,
- "vs-4110: amount_needed parameter incorrect (%d)", amount_needed);
-
- /* We continue the while loop if another process snatches our found
- * free block from us after we find it but before we successfully
- * mark it as in use */
-
- while (amount_needed--) {
- /* skip over any blocknrs already gotten last time. */
- if (*(free_blocknrs) != 0) {
- RFALSE( is_reusable (s, *free_blocknrs, 1) == 0,
- "vs-4120: bad blocknr on free_blocknrs list");
- free_blocknrs++;
- continue;
- }
- /* look for zero bits in bitmap */
- if (find_zero_bit_in_bitmap(s,search_start, &i, &j,for_unformatted) == 0) {
- if (find_zero_bit_in_bitmap(s,search_start,&i,&j, for_unformatted) == 0) {
- /* recode without the goto and without
- the if. It will require a
- duplicate for. This is worth the
- code clarity. Your way was
- admirable, and just a bit too
- clever in saving instructions.:-)
- I'd say create a new function, but
- that would slow things also, yes?
- -Hans */
-free_and_return:
- for ( ; block_list_start != free_blocknrs; block_list_start++) {
- reiserfs_free_block (th, *block_list_start);
- *block_list_start = 0;
- }
- if (for_prealloc)
- return NO_MORE_UNUSED_CONTIGUOUS_BLOCKS;
- else
- return NO_DISK_SPACE;
- }
+void reiserfs_discard_all_prealloc (struct reiserfs_transaction_handle *th)
+{
+ struct list_head * plist = &SB_JOURNAL(th->t_super)->j_prealloc_list;
+ struct inode * inode;
+
+ while (!list_empty(plist)) {
+ inode = list_entry(plist->next, struct inode, u.reiserfs_i.i_prealloc_list);
+#ifdef CONFIG_REISERFS_CHECK
+ if (!inode->u.reiserfs_i.i_prealloc_count) {
+ reiserfs_warning("zam-4001:%s: inode is in prealloc list but has no preallocated blocks.\n", __FUNCTION__ );
}
-
- /* i and j now contain the results of the search. i = bitmap block
- number containing free block, j = offset in this block. we
- compute the blocknr which is our result, store it in
- free_blocknrs, and increment the pointer so that on the next
- loop we will insert into the next location in the array. Also
- in preparation for the next loop, search_start is changed so
- that the next search will not rescan the same range but will
- start where this search finished. Note that while it is
- possible that schedule has occurred and blocks have been freed
- in that range, it is perhaps more important that the blocks
- returned be near each other than that they be near their other
- neighbors, and it also simplifies and speeds the code this way. */
-
- /* journal: we need to make sure the block we are giving out is not
- ** a log block, horrible things would happen there.
- */
- new_block = (i * (s->s_blocksize << 3)) + j;
- if (for_prealloc && (new_block - 1) != search_start) {
- /* preallocated blocks must be contiguous, bail if we didnt find one.
- ** this is not a bug. We want to do the check here, before the
- ** bitmap block is prepared, and before we set the bit and log the
- ** bitmap.
- **
- ** If we do the check after this function returns, we have to
- ** call reiserfs_free_block for new_block, which would be pure
- ** overhead.
- **
- ** for_prealloc should only be set if the caller can deal with the
- ** NO_MORE_UNUSED_CONTIGUOUS_BLOCKS return value. This can be
- ** returned before the disk is actually full
- */
- goto free_and_return ;
- }
- search_start = new_block ;
- if (search_start >= reiserfs_get_journal_block(s) &&
- search_start < (reiserfs_get_journal_block(s) + JOURNAL_BLOCK_COUNT)) {
- reiserfs_warning("vs-4130: reiserfs_new_blocknrs: trying to allocate log block %lu\n",
- search_start) ;
- search_start++ ;
- amount_needed++ ;
- continue ;
- }
-
-
- reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[i], 1) ;
-
- RFALSE( buffer_locked (SB_AP_BITMAP (s)[i]) ||
- is_reusable (s, search_start, 0) == 0,
- "vs-4140: bitmap block is locked or bad block number found");
-
- /* if this bit was already set, we've scheduled, and someone else
- ** has allocated it. loop around and try again
- */
- if (reiserfs_test_and_set_le_bit (j, SB_AP_BITMAP (s)[i]->b_data)) {
- reiserfs_restore_prepared_buffer(s, SB_AP_BITMAP(s)[i]) ;
- amount_needed++ ;
- continue ;
- }
- journal_mark_dirty (th, s, SB_AP_BITMAP (s)[i]);
- *free_blocknrs = search_start ;
- free_blocknrs ++;
+#endif
+ __discard_prealloc(th, inode);
}
+}

- reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1) ;
- /* update free block count in super block */
- PUT_SB_FREE_BLOCKS( s, SB_FREE_BLOCKS(s) - init_amount_needed );
- journal_mark_dirty (th, s, SB_BUFFER_WITH_SB (s));
- s->s_dirt = 1;
-
- return CARRY_ON;
-}
-
-// this is called only by get_empty_nodes
-int reiserfs_new_blocknrs (struct reiserfs_transaction_handle *th, unsigned long * free_blocknrs,
- unsigned long search_start, int amount_needed) {
- return do_reiserfs_new_blocknrs(th, free_blocknrs, search_start, amount_needed, 0/*priority*/, 0/*for_formatted*/, 0/*for_prealloc */) ;
-}
-
-
-// called by get_new_buffer and by reiserfs_get_block with amount_needed == 1
-int reiserfs_new_unf_blocknrs(struct reiserfs_transaction_handle *th, unsigned long * free_blocknrs,
- unsigned long search_start) {
- return do_reiserfs_new_blocknrs(th, free_blocknrs, search_start,
- 1/*amount_needed*/,
- 0/*priority*/,
- 1/*for formatted*/,
- 0/*for prealloc */) ;
-}
-
-#ifdef REISERFS_PREALLOCATE
-
-/*
-** We pre-allocate 8 blocks. Pre-allocation is used for files > 16 KB only.
-** This lowers fragmentation on large files by grabbing a contiguous set of
-** blocks at once. It also limits the number of times the bitmap block is
-** logged by making X number of allocation changes in a single transaction.
-**
-** We are using a border to divide the disk into two parts. The first part
-** is used for tree blocks, which have a very high turnover rate (they
-** are constantly allocated then freed)
-**
-** The second part of the disk is for the unformatted nodes of larger files.
-** Putting them away from the tree blocks lowers fragmentation, and makes
-** it easier to group files together. There are a number of different
-** allocation schemes being tried right now, each is documented below.
-**
-** A great deal of the allocator's speed comes because reiserfs_get_block
-** sends us the block number of the last unformatted node in the file. Once
-** a given block is allocated past the border, we don't collide with the
-** blocks near the search_start again.
-**
-*/
-int reiserfs_new_unf_blocknrs2 (struct reiserfs_transaction_handle *th,
- struct inode * p_s_inode,
- unsigned long * free_blocknrs,
- unsigned long search_start)
-{
- int ret=0, blks_gotten=0;
- unsigned long border = 0;
- unsigned long bstart = 0;
- unsigned long hash_in, hash_out;
- unsigned long saved_search_start=search_start;
- int allocated[PREALLOCATION_SIZE];
- int blks;
-
- if (!reiserfs_no_border(th->t_super)) {
- /* we default to having the border at the 10% mark of the disk. This
- ** is an arbitrary decision and it needs tuning. It also needs a limit
- ** to prevent it from taking too much space on huge drives.
- */
- bstart = (SB_BLOCK_COUNT(th->t_super) / 10);
- }
- if (!reiserfs_no_unhashed_relocation(th->t_super)) {
- /* this is a very simple first attempt at preventing too much grouping
- ** around the border value. Since k_dir_id is never larger than the
- ** highest allocated oid, it is far from perfect, and files will tend
- ** to be grouped towards the start of the border
- */
- border = le32_to_cpu(INODE_PKEY(p_s_inode)->k_dir_id) % (SB_BLOCK_COUNT(th->t_super) - bstart - 1) ;
- } else if (!reiserfs_hashed_relocation(th->t_super)) {
- hash_in = le32_to_cpu((INODE_PKEY(p_s_inode))->k_dir_id);
- /* I wonder if the CPU cost of the
- hash will obscure the layout
- effect? Of course, whether that
- effect is good or bad we don't
- know.... :-) */
-
- hash_out = keyed_hash(((char *) (&hash_in)), 4);
- border = hash_out % (SB_BLOCK_COUNT(th->t_super) - bstart - 1) ;
- }
- border += bstart ;
- allocated[0] = 0 ; /* important. Allows a check later on to see if at
- * least one block was allocated. This prevents false
- * no disk space returns
- */
-
- if ( (p_s_inode->i_size < 4 * 4096) ||
- !(S_ISREG(p_s_inode->i_mode)) )
- {
- if ( search_start < border
- || (
- /* allow us to test whether it is a
- good idea to prevent files from
- getting too far away from their
- packing locality by some unexpected
- means. This might be poor code for
- directories whose files total
- larger than 1/10th of the disk, and
- it might be good code for
- suffering from old insertions when the disk
- was almost full. */
- /* changed from !reiserfs_test3(th->t_super), which doesn't
- ** seem like a good idea. Think about adding blocks to
- ** a large file. If you've allocated 10% of the disk
- ** in contiguous blocks, you start over at the border value
- ** for every new allocation. This throws away all the
- ** information sent in about the last block that was allocated
- ** in the file. Not a good general case at all.
- ** -chris
- */
- reiserfs_test4(th->t_super) &&
- (search_start > border + (SB_BLOCK_COUNT(th->t_super) / 10))
- )
- )
- search_start=border;
-
- ret = do_reiserfs_new_blocknrs(th, free_blocknrs, search_start,
- 1/*amount_needed*/,
- 0/*use reserved blocks for root */,
- 1/*for_formatted*/,
- 0/*for prealloc */) ;
- return ret;
- }
-
- /* take a block off the prealloc list and return it -Hans */
- if (p_s_inode->u.reiserfs_i.i_prealloc_count > 0) {
- p_s_inode->u.reiserfs_i.i_prealloc_count--;
- *free_blocknrs = p_s_inode->u.reiserfs_i.i_prealloc_block++;
-
- /* if no more preallocated blocks, remove inode from list */
- if (! p_s_inode->u.reiserfs_i.i_prealloc_count) {
- list_del(&p_s_inode->u.reiserfs_i.i_prealloc_list);
+/* block allocator related options are parsed here */
+int reiserfs_parse_alloc_options(struct super_block * s, char * options)
+{
+ char * this_char, * value;
+
+ s->u.reiserfs_sb.s_alloc_options.preallocmin = 4;
+ s->u.reiserfs_sb.s_alloc_options.bits = 0; /* clear default settings */
+
+ for (this_char = strtok (options, ":"); this_char != NULL; this_char = strtok (NULL, ":")) {
+ if ((value = strchr (this_char, '=')) != NULL)
+ *value++ = 0;
+
+ if (!strcmp(this_char, "concentrating_formatted_nodes")) {
+ int temp;
+ SET_OPTION(concentrating_formatted_nodes);
+ temp = (value && *value) ? simple_strtoul (value, &value, 0) : 10;
+ if (temp <= 0 || temp > 100) {
+ s->u.reiserfs_sb.s_alloc_options.border = 10;
+ } else {
+ s->u.reiserfs_sb.s_alloc_options.border = 100 / temp;
+ }
+ continue;
+ }
+ if (!strcmp(this_char, "displacing_large_files")) {
+ SET_OPTION(displacing_large_files);
+ s->u.reiserfs_sb.s_alloc_options.large_file_size =
+ (value && *value) ? simple_strtoul (value, &value, 0) : 16;
+ continue;
+ }
+ if (!strcmp(this_char, "displacing_new_packing_localities")) {
+ SET_OPTION(displacing_new_packing_localities);
+ continue;
+ };
+
+ if (!strcmp(this_char, "old_hashed_relocation")) {
+ SET_OPTION(old_hashed_relocation);
+ continue;
+ }
+
+ if (!strcmp(this_char, "new_hashed_relocation")) {
+ SET_OPTION(new_hashed_relocation);
+ continue;
+ }
+
+ if (!strcmp(this_char, "hashed_formatted_nodes")) {
+ SET_OPTION(hashed_formatted_nodes);
+ continue;
+ }
+
+ if (!strcmp(this_char, "skip_busy")) {
+ SET_OPTION(skip_busy);
+ continue;
+ }
+
+ if (!strcmp(this_char, "hundredth_slices")) {
+ SET_OPTION(hundredth_slices);
+ continue;
+ }
+
+ if (!strcmp(this_char, "old_way")) {
+ SET_OPTION(old_way);
+ continue;
+ }
+
+ if (!strcmp(this_char, "displace_based_on_dirid")) {
+ SET_OPTION(displace_based_on_dirid);
+ continue;
+ }
+
+ if (!strcmp(this_char, "preallocmin")) {
+ s->u.reiserfs_sb.s_alloc_options.preallocmin =
+ (value && *value) ? simple_strtoul (value, &value, 0) : 4;
+ continue;
+ }
+
+ if (!strcmp(this_char, "preallocsize")) {
+ s->u.reiserfs_sb.s_alloc_options.preallocsize =
+ (value && *value) ? simple_strtoul (value, &value, 0) : PREALLOCATION_SIZE;
+ continue;
+ }
+
+ reiserfs_warning("zam-4001: %s : unknown option - %s\n", __FUNCTION__ , this_char);
+ return 1;
}
-
- return ret;
- }

- /* else get a new preallocation for the file */
- reiserfs_discard_prealloc (th, p_s_inode);
- /* this uses the last preallocated block as the search_start. discard
- ** prealloc does not zero out this number.
- */
- if (search_start <= p_s_inode->u.reiserfs_i.i_prealloc_block) {
- search_start = p_s_inode->u.reiserfs_i.i_prealloc_block;
- }
-
- /* doing the compare again forces search_start to be >= the border,
- ** even if the file already had prealloction done. This seems extra,
- ** and should probably be removed
- */
- if ( search_start < border ) search_start=border;
-
- /* If the disk free space is already below 10% we should
- ** start looking for the free blocks from the beginning
- ** of the partition, before the border line.
- */
- if ( SB_FREE_BLOCKS(th->t_super) <= (SB_BLOCK_COUNT(th->t_super) / 10) ) {
- search_start=saved_search_start;
- }
+ return 0;
+}

- *free_blocknrs = 0;
- blks = PREALLOCATION_SIZE-1;
- for (blks_gotten=0; blks_gotten<PREALLOCATION_SIZE; blks_gotten++) {
- ret = do_reiserfs_new_blocknrs(th, free_blocknrs, search_start,
- 1/*amount_needed*/,
- 0/*for root reserved*/,
- 1/*for_formatted*/,
- (blks_gotten > 0)/*must_be_contiguous*/) ;
- /* if we didn't find a block this time, adjust blks to reflect
- ** the actual number of blocks allocated
- */
- if (ret != CARRY_ON) {
- blks = blks_gotten > 0 ? (blks_gotten - 1) : 0 ;
- break ;
+static void inline new_hashed_relocation (reiserfs_blocknr_hint_t * hint)
+{
+ char * hash_in;
+ if (hint->formatted_node) {
+ hash_in = (char*)&hint->key.k_dir_id;
+ } else {
+ if (!hint->inode) {
+ //hint->search_start = hint->beg;
+ hash_in = (char*)&hint->key.k_dir_id;
+ } else
+ if ( TEST_OPTION(displace_based_on_dirid, hint->th->t_super))
+ hash_in = (char *)(&INODE_PKEY(hint->inode)->k_dir_id);
+ else
+ hash_in = (char *)(&INODE_PKEY(hint->inode)->k_objectid);
}
- allocated[blks_gotten]= *free_blocknrs;
-#ifdef CONFIG_REISERFS_CHECK
- if ( (blks_gotten>0) && (allocated[blks_gotten] - allocated[blks_gotten-1]) != 1 ) {
- /* this should be caught by new_blocknrs now, checking code */
- reiserfs_warning("yura-1, reiserfs_new_unf_blocknrs2: pre-allocated not contiguous set of blocks!\n") ;
- reiserfs_free_block(th, allocated[blks_gotten]);
- blks = blks_gotten-1;
- break;
+
+ hint->search_start = hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg);
+}
+
+static void inline get_left_neighbor(reiserfs_blocknr_hint_t *hint)
+{
+ struct path * path;
+ struct buffer_head * bh;
+ struct item_head * ih;
+ int pos_in_item;
+ __u32 * item;
+
+ if (!hint->path) /* reiserfs code can call this function w/o pointer to path
+ * structure supplied; then we rely on supplied search_start */
+ return;
+
+ path = hint->path;
+ bh = get_last_bh(path);
+ RFALSE( !bh, "green-4002: Illegal path specified to get_left_neighbor\n");
+ ih = get_ih(path);
+ pos_in_item = path->pos_in_item;
+ item = get_item (path);
+
+ hint->search_start = bh->b_blocknr;
+
+ if (!hint->formatted_node && is_indirect_le_ih (ih)) {
+ /* for indirect item: go to left and look for the first non-hole entry
+ in the indirect item */
+ if (pos_in_item == I_UNFM_NUM (ih))
+ pos_in_item--;
+// pos_in_item = I_UNFM_NUM (ih) - 1;
+ while (pos_in_item >= 0) {
+ int t=get_block_num(item,pos_in_item);
+ if (t) {
+ hint->search_start = t;
+ break;
+ }
+ pos_in_item --;
+ }
+ } else {
}
+
+ /* does result value fit into specified region? */
+ return;
+}
+
+/* should be, if formatted node, then try to put on first part of the device
+ specified as number of percent with mount option device, else try to put
+ on last of device. This is not to say it is good code to do so,
+ but the effect should be measured. */
+static void inline set_border_in_hint(struct super_block *s, reiserfs_blocknr_hint_t *hint)
+{
+ b_blocknr_t border = SB_BLOCK_COUNT(hint->th->t_super) / s->u.reiserfs_sb.s_alloc_options.border;
+
+ if (hint->formatted_node)
+ hint->end = border - 1;
+ else
+ hint->beg = border;
+}
+
+static void inline displace_large_file(reiserfs_blocknr_hint_t *hint)
+{
+ if ( TEST_OPTION(displace_based_on_dirid, hint->th->t_super))
+ hint->search_start = hint->beg + keyed_hash((char *)(&INODE_PKEY(hint->inode)->k_dir_id), 4) % (hint->end - hint->beg);
+ else
+ hint->search_start = hint->beg + keyed_hash((char *)(&INODE_PKEY(hint->inode)->k_objectid), 4) % (hint->end - hint->beg);
+}
+
+static void inline hash_formatted_node(reiserfs_blocknr_hint_t *hint)
+{
+ char * hash_in;
+
+ if (!hint->inode)
+ hash_in = (char*)&hint->key.k_dir_id;
+ else if ( TEST_OPTION(displace_based_on_dirid, hint->th->t_super))
+ hash_in = (char *)(&INODE_PKEY(hint->inode)->k_dir_id);
+ else
+ hash_in = (char *)(&INODE_PKEY(hint->inode)->k_objectid);
+
+ hint->search_start = hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg);
+}
+
+static int inline this_blocknr_allocation_would_make_it_a_large_file(reiserfs_blocknr_hint_t *hint)
+{
+ return hint->block == hint->th->t_super->u.reiserfs_sb.s_alloc_options.large_file_size;
+}
+
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+static void inline displace_new_packing_locality (reiserfs_blocknr_hint_t *hint)
+{
+ struct key * key = &hint->key;
+
+ hint->th->displace_new_blocks = 0;
+ hint->search_start = hint->beg + keyed_hash((char*)(&key->k_objectid),4) % (hint->end - hint->beg);
+}
#endif
- if (blks_gotten==0) {
- p_s_inode->u.reiserfs_i.i_prealloc_block = *free_blocknrs;
+
+static int inline old_hashed_relocation (reiserfs_blocknr_hint_t * hint)
+{
+ unsigned long border;
+ unsigned long hash_in;
+
+ if (hint->formatted_node || hint->inode == NULL) {
+ return 0;
}
- search_start = *free_blocknrs;
- *free_blocknrs = 0;
- }
- p_s_inode->u.reiserfs_i.i_prealloc_count = blks;
- *free_blocknrs = p_s_inode->u.reiserfs_i.i_prealloc_block;
- p_s_inode->u.reiserfs_i.i_prealloc_block++;
-
- /* if inode has preallocated blocks, link him to list */
- if (p_s_inode->u.reiserfs_i.i_prealloc_count) {
- list_add(&p_s_inode->u.reiserfs_i.i_prealloc_list,
- &SB_JOURNAL(th->t_super)->j_prealloc_list);
- }
- /* we did actually manage to get 1 block */
- if (ret != CARRY_ON && allocated[0] > 0) {
- return CARRY_ON ;
- }
- /* NO_MORE_UNUSED_CONTIGUOUS_BLOCKS should only mean something to
- ** the preallocation code. The rest of the filesystem asks for a block
- ** and should either get it, or know the disk is full. The code
- ** above should never allow ret == NO_MORE_UNUSED_CONTIGUOUS_BLOCK,
- ** as it doesn't send for_prealloc = 1 to do_reiserfs_new_blocknrs
- ** unless it has already successfully allocated at least one block.
- ** Just in case, we translate into a return value the rest of the
- ** filesystem can understand.
- **
- ** It is an error to change this without making the
- ** rest of the filesystem understand NO_MORE_UNUSED_CONTIGUOUS_BLOCKS
- ** If you consider it a bug to return NO_DISK_SPACE here, fix the rest
- ** of the fs first.
- */
- if (ret == NO_MORE_UNUSED_CONTIGUOUS_BLOCKS) {
-#ifdef CONFIG_REISERFS_CHECK
- reiserfs_warning("reiser-2015: this shouldn't happen, may cause false out of disk space error");
-#endif
- return NO_DISK_SPACE;
- }
- return ret;
+
+ hash_in = le32_to_cpu((INODE_PKEY(hint->inode))->k_dir_id);
+ border = hint->beg + (unsigned long) keyed_hash(((char *) (&hash_in)), 4) % (hint->end - hint->beg - 1);
+ if (border > hint->search_start)
+ hint->search_start = border;
+
+ return 1;
}

+static int inline old_way (reiserfs_blocknr_hint_t * hint)
+{
+ unsigned long border;
+
+ if (hint->formatted_node || hint->inode == NULL) {
+ return 0;
+ }

-static void __discard_prealloc (struct reiserfs_transaction_handle * th,
- struct inode * inode)
+ border = hint->beg + le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id) % (hint->end - hint->beg);
+ if (border > hint->search_start)
+ hint->search_start = border;
+
+ return 1;
+}
+
+static void inline hundredth_slices (reiserfs_blocknr_hint_t * hint)
{
- unsigned long save = inode->u.reiserfs_i.i_prealloc_block ;
- while (inode->u.reiserfs_i.i_prealloc_count > 0) {
- reiserfs_free_prealloc_block(th,inode->u.reiserfs_i.i_prealloc_block);
- inode->u.reiserfs_i.i_prealloc_block++;
- inode->u.reiserfs_i.i_prealloc_count --;
- }
- inode->u.reiserfs_i.i_prealloc_block = save ;
- list_del (&(inode->u.reiserfs_i.i_prealloc_list));
+ struct key * key = &hint->key;
+ unsigned long slice_start;
+
+ slice_start = (keyed_hash((char*)(&key->k_dir_id),4) % 100) * (hint->end / 100);
+ if ( slice_start > hint->search_start || slice_start + (hint->end / 100) <= hint->search_start) {
+ hint->search_start = slice_start;
+ }
}

+static void inline determine_search_start(reiserfs_blocknr_hint_t *hint,
+ int amount_needed)
+{
+ struct super_block *s = hint->th->t_super;
+ hint->beg = 0;
+ hint->end = SB_BLOCK_COUNT(s) - 1;
+
+ /* This is former border algorithm. Now with tunable border offset */
+ if (concentrating_formatted_nodes(s))
+ set_border_in_hint(s, hint);
+
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ /* whenever we create a new directory, we displace it. At first we will
+ hash for location, later we might look for a moderately empty place for
+ it */
+ if (displacing_new_packing_localities(s)
+ && hint->th->displace_new_blocks) {
+ displace_new_packing_locality(hint);
+
+ /* we do not continue determine_search_start,
+ * if new packing locality is being displaced */
+ return;
+ }
+#endif

-void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th,
- struct inode * inode)
+ /* all persons should feel encouraged to add more special cases here and
+ * test them */
+
+ if (displacing_large_files(s) && !hint->formatted_node
+ && this_blocknr_allocation_would_make_it_a_large_file(hint)) {
+ displace_large_file(hint);
+ return;
+ }
+
+ /* attempt to copy a feature from old block allocator code */
+ if (TEST_OPTION(old_hashed_relocation, s) && !hint->formatted_node) {
+ old_hashed_relocation(hint);
+ }
+
+ /* if none of our special cases is relevant, use the left neighbor in the
+ tree order of the new node we are allocating for */
+ if (hint->formatted_node && TEST_OPTION(hashed_formatted_nodes,s)) {
+ hash_formatted_node(hint);
+ return;
+ }
+
+ get_left_neighbor(hint);
+
+ /* Mimic old block allocator behaviour, that is if VFS allowed for preallocation,
+ new blocks are displaced based on directory ID. Also, if suggested search_start
+ is less than last preallocated block, we start searching from it, assuming that
+ HDD dataflow is faster in forward direction */
+ if ( TEST_OPTION(old_way, s)) {
+ if (!hint->formatted_node) {
+ if ( !reiserfs_hashed_relocation(s))
+ old_way(hint);
+ else if (!reiserfs_no_unhashed_relocation(s))
+ old_hashed_relocation(hint);
+
+ if ( hint->inode && hint->search_start < hint->inode->u.reiserfs_i.i_prealloc_block)
+ hint->search_start = hint->inode->u.reiserfs_i.i_prealloc_block;
+ }
+ return;
+ }
+
+ /* This is an approach proposed by Hans */
+ if ( TEST_OPTION(hundredth_slices, s) && ! (displacing_large_files(s) && !hint->formatted_node)) {
+ hundredth_slices(hint);
+ return;
+ }
+
+ if (TEST_OPTION(old_hashed_relocation, s))
+ old_hashed_relocation(hint);
+ if (TEST_OPTION(new_hashed_relocation, s))
+ new_hashed_relocation(hint);
+ return;
+}
+
+static int determine_prealloc_size(reiserfs_blocknr_hint_t * hint)
{
-#ifdef CONFIG_REISERFS_CHECK
- if (inode->u.reiserfs_i.i_prealloc_count < 0)
- reiserfs_warning("zam-4001:%s: inode has negative prealloc blocks count.\n", __FUNCTION__);
-#endif
- if (inode->u.reiserfs_i.i_prealloc_count > 0) {
- __discard_prealloc(th, inode);
- }
- }
+ /* make minimum size a mount option and benchmark both ways */
+ /* we preallocate blocks only for regular files, specific size */
+ /* benchmark preallocating always and see what happens */
+
+ hint->prealloc_size = 0;
+
+ if (!hint->formatted_node && hint->preallocate) {
+ if (S_ISREG(hint->inode->i_mode)
+ && hint->inode->i_size >= hint->th->t_super->u.reiserfs_sb.s_alloc_options.preallocmin * hint->inode->i_sb->s_blocksize)
+ hint->prealloc_size = hint->th->t_super->u.reiserfs_sb.s_alloc_options.preallocsize - 1;
+ }
+ return CARRY_ON;
+}
+
+/* XXX I know it could be merged with upper-level function;
+ but may be result function would be too complex. */
+static inline int allocate_without_wrapping_disk (reiserfs_blocknr_hint_t * hint,
+ b_blocknr_t * new_blocknrs,
+ b_blocknr_t start, b_blocknr_t finish,
+ int amount_needed, int prealloc_size)
+{
+ int rest = amount_needed;
+ int nr_allocated;

-void reiserfs_discard_all_prealloc (struct reiserfs_transaction_handle *th)
+ while (rest > 0) {
+ nr_allocated = scan_bitmap (hint->th, &start, finish, 1,
+ rest + prealloc_size, !hint->formatted_node,
+ hint->block);
+
+ if (nr_allocated == 0) /* no new blocks allocated, return */
+ break;
+
+ /* fill free_blocknrs array first */
+ while (rest > 0 && nr_allocated > 0) {
+ * new_blocknrs ++ = start ++;
+ rest --; nr_allocated --;
+ }
+
+ /* do we have something to fill prealloc. array also ? */
+ if (nr_allocated > 0) {
+ /* it means prealloc_size was greater that 0 and we do preallocation */
+ list_add(&INODE_INFO(hint->inode)->i_prealloc_list,
+ &SB_JOURNAL(hint->th->t_super)->j_prealloc_list);
+ INODE_INFO(hint->inode)->i_prealloc_block = start;
+ INODE_INFO(hint->inode)->i_prealloc_count = nr_allocated;
+ break;
+ }
+ }
+
+ return (amount_needed - rest);
+}
+
+static inline int blocknrs_and_prealloc_arrays_from_search_start
+ (reiserfs_blocknr_hint_t *hint, b_blocknr_t *new_blocknrs, int amount_needed)
{
- struct list_head * plist = &SB_JOURNAL(th->t_super)->j_prealloc_list;
- struct inode * inode;
-
- while (!list_empty(plist)) {
- inode = list_entry(plist->next, struct inode, u.reiserfs_i.i_prealloc_list);
-#ifdef CONFIG_REISERFS_CHECK
- if (!inode->u.reiserfs_i.i_prealloc_count) {
- reiserfs_warning("zam-4001:%s: inode is in prealloc list but has no preallocated blocks.\n", __FUNCTION__);
+ struct super_block *s = hint->th->t_super;
+ b_blocknr_t start = hint->search_start;
+ b_blocknr_t finish = SB_BLOCK_COUNT(s) - 1;
+ int second_pass = 0;
+ int nr_allocated = 0;
+
+ determine_prealloc_size(hint);
+ while((nr_allocated
+ += allocate_without_wrapping_disk(hint, new_blocknrs + nr_allocated, start, finish,
+ amount_needed - nr_allocated, hint->prealloc_size))
+ < amount_needed) {
+
+ /* not all blocks were successfully allocated yet*/
+ if (second_pass) { /* it was a second pass; we must free all blocks */
+ while (nr_allocated --)
+ reiserfs_free_block(hint->th, new_blocknrs[nr_allocated]);
+
+ return NO_DISK_SPACE;
+ } else { /* refine search parameters for next pass */
+ second_pass = 1;
+ finish = start;
+ start = 0;
+ continue;
+ }
}
-#endif
- __discard_prealloc(th, inode);
+ return CARRY_ON;
+}
+
+/* grab new blocknrs from preallocated list */
+/* return amount still needed after using them */
+static int use_preallocated_list_if_available (reiserfs_blocknr_hint_t *hint,
+ b_blocknr_t *new_blocknrs, int amount_needed)
+{
+ struct inode * inode = hint->inode;
+
+ if (INODE_INFO(inode)->i_prealloc_count > 0) {
+ while (amount_needed) {
+
+ *new_blocknrs ++ = INODE_INFO(inode)->i_prealloc_block ++;
+ INODE_INFO(inode)->i_prealloc_count --;
+
+ amount_needed --;
+
+ if (INODE_INFO(inode)->i_prealloc_count <= 0) {
+ list_del(&inode->u.reiserfs_i.i_prealloc_list);
+ break;
+ }
+ }
}
+ /* return amount still needed after using preallocated blocks */
+ return amount_needed;
+}
+
+int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *hint,
+ b_blocknr_t * new_blocknrs, int amount_needed,
+ int reserved_by_us /* Amount of blocks we have
+ already reserved */)
+{
+ int initial_amount_needed = amount_needed;
+ int ret;
+
+ /* Check if there is enough space, taking into account reserved space */
+ if ( SB_FREE_BLOCKS(hint->th->t_super) - hint->th->t_super->u.reiserfs_sb.reserved_blocks <
+ amount_needed - reserved_by_us)
+ return NO_DISK_SPACE;
+ /* should this be if !hint->inode && hint->preallocate? */
+ /* do you mean hint->formatted_node can be removed ? - Zam */
+ /* hint->formatted_node cannot be removed because we try to access
+ inode information here, and there is often no inode assotiated with
+ metadata allocations - green */
+
+ if (!hint->formatted_node && hint->preallocate) {
+ amount_needed = use_preallocated_list_if_available
+ (hint, new_blocknrs, amount_needed);
+ if (amount_needed == 0) /* all blocknrs we need we got from
+ prealloc. list */
+ return CARRY_ON;
+ new_blocknrs += (initial_amount_needed - amount_needed);
+ }
+
+ /* find search start and save it in hint structure */
+ determine_search_start(hint, amount_needed);
+
+ /* allocation itself; fill new_blocknrs and preallocation arrays */
+ ret = blocknrs_and_prealloc_arrays_from_search_start
+ (hint, new_blocknrs, amount_needed);
+
+ /* we used prealloc. list to fill (partially) new_blocknrs array. If final allocation fails we
+ * need to return blocks back to prealloc. list or just free them. -- Zam (I chose second
+ * variant) */
+
+ if (ret != CARRY_ON) {
+ while (amount_needed ++ < initial_amount_needed) {
+ reiserfs_free_block(hint->th, *(--new_blocknrs));
+ }
+ }
+ return ret;
+}
+
+/* These 2 functions are here to provide blocks reservation to the rest of kernel */
+/* Reserve @blocks amount of blocks in fs pointed by @sb. Caller must make sure
+ there are actually this much blocks on the FS available */
+void reiserfs_claim_blocks_to_be_allocated(
+ struct super_block *sb, /* super block of
+ filesystem where
+ blocks should be
+ reserved */
+ int blocks /* How much to reserve */
+ )
+{
+
+ /* Fast case, if reservation is zero - exit immediately. */
+ if ( !blocks )
+ return;
+
+ sb->u.reiserfs_sb.reserved_blocks += blocks;
+}
+
+/* Unreserve @blocks amount of blocks in fs pointed by @sb */
+void reiserfs_release_claimed_blocks(
+ struct super_block *sb, /* super block of
+ filesystem where
+ blocks should be
+ reserved */
+ int blocks /* How much to unreserve */
+ )
+{
+
+ /* Fast case, if unreservation is zero - exit immediately. */
+ if ( !blocks )
+ return;
+
+ sb->u.reiserfs_sb.reserved_blocks -= blocks;
+ RFALSE( sb->u.reiserfs_sb.reserved_blocks < 0, "amount of blocks reserved became zero?");
}
-#endif
diff -Nru a/fs/reiserfs/fix_node.c b/fs/reiserfs/fix_node.c
--- a/fs/reiserfs/fix_node.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/fix_node.c Fri Aug 9 19:31:45 2002
@@ -795,8 +795,8 @@
else /* If we have enough already then there is nothing to do. */
return CARRY_ON;

- if ( reiserfs_new_blocknrs (p_s_tb->transaction_handle, a_n_blocknrs,
- PATH_PLAST_BUFFER(p_s_tb->tb_path)->b_blocknr, n_amount_needed) == NO_DISK_SPACE )
+ if ( reiserfs_new_form_blocknrs (p_s_tb, a_n_blocknrs,
+ n_amount_needed) == NO_DISK_SPACE )
return NO_DISK_SPACE;

/* for each blocknumber we just got, get a buffer and stick it on FEB */
diff -Nru a/fs/reiserfs/hashes.c b/fs/reiserfs/hashes.c
--- a/fs/reiserfs/hashes.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/hashes.c Fri Aug 9 19:31:45 2002
@@ -19,6 +19,7 @@
//

#include <asm/types.h>
+#include <asm/page.h>

@@ -57,7 +58,6 @@
u32 pad;
int i;

-
// assert(len >= 0 && len < 256);

pad = (u32)len | ((u32)len << 8);
@@ -92,7 +92,7 @@
{
//assert(len < 16);
if (len >= 16)
- *(int *)0 = 0;
+ BUG();

a = (u32)msg[ 0] |
(u32)msg[ 1] << 8 |
@@ -118,7 +118,7 @@
{
//assert(len < 12);
if (len >= 12)
- *(int *)0 = 0;
+ BUG();
a = (u32)msg[ 0] |
(u32)msg[ 1] << 8 |
(u32)msg[ 2] << 16|
@@ -139,7 +139,7 @@
{
//assert(len < 8);
if (len >= 8)
- *(int *)0 = 0;
+ BUG();
a = (u32)msg[ 0] |
(u32)msg[ 1] << 8 |
(u32)msg[ 2] << 16|
@@ -156,7 +156,7 @@
{
//assert(len < 4);
if (len >= 4)
- *(int *)0 = 0;
+ BUG();
a = b = c = d = pad;
for(i = 0; i < len; i++)
{
diff -Nru a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
--- a/fs/reiserfs/inode.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/inode.c Fri Aug 9 19:31:45 2002
@@ -155,33 +155,6 @@
}
}

-
-
-
-/* we need to allocate a block for new unformatted node. Try to figure out
- what point in bitmap reiserfs_new_blocknrs should start from. */
-static b_blocknr_t find_tag (struct buffer_head * bh, struct item_head * ih,
- __u32 * item, int pos_in_item)
-{
- __u32 block ;
- if (!is_indirect_le_ih (ih))
- /* something more complicated could be here */
- return bh->b_blocknr;
-
- /* for indirect item: go to left and look for the first non-hole entry in
- the indirect item */
- if (pos_in_item == I_UNFM_NUM (ih))
- pos_in_item --;
- while (pos_in_item >= 0) {
- block = get_block_num(item, pos_in_item) ;
- if (block)
- return block ;
- pos_in_item --;
- }
- return bh->b_blocknr;
-}
-
-
/* reiserfs_get_block does not need to allocate a block only if it has been
done already or non-hole position has been found in the indirect item */
static inline int allocation_needed (int retval, b_blocknr_t allocated,
@@ -344,10 +317,10 @@
** kmap schedules
*/
if (!p) {
- p = (char *)kmap(bh_result->b_page) ;
- if (fs_changed (fs_gen, inode->i_sb) && item_moved (&tmp_ih, &path)) {
- goto research;
- }
+ p = (char *)kmap(bh_result->b_page) ;
+ if (fs_changed (fs_gen, inode->i_sb) && item_moved (&tmp_ih, &path)) {
+ goto research;
+ }
}
p += offset ;
memset (p, 0, inode->i_sb->s_blocksize);
@@ -527,24 +500,24 @@
}

static inline int _allocate_block(struct reiserfs_transaction_handle *th,
+ long block,
struct inode *inode,
b_blocknr_t *allocated_block_nr,
- unsigned long tag,
+ struct path * path,
int flags) {

#ifdef REISERFS_PREALLOCATE
if (!(flags & GET_BLOCK_NO_ISEM)) {
- return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr, tag);
+ return reiserfs_new_unf_blocknrs2(th, inode, allocated_block_nr, path, block);
}
#endif
- return reiserfs_new_unf_blocknrs (th, allocated_block_nr, tag);
+ return reiserfs_new_unf_blocknrs (th, allocated_block_nr, path, block);
}

static int reiserfs_get_block (struct inode * inode, long block,
struct buffer_head * bh_result, int create)
{
int repeat, retval;
- unsigned long tag;
b_blocknr_t allocated_block_nr = 0;// b_blocknr_t is unsigned long
INITIALIZE_PATH(path);
int pos_in_item;
@@ -623,7 +596,6 @@

if (allocation_needed (retval, allocated_block_nr, ih, item, pos_in_item)) {
/* we have to allocate block for the unformatted node */
- tag = find_tag (bh, ih, item, pos_in_item);
if (!transaction_started) {
pathrelse(&path) ;
journal_begin(&th, inode->i_sb, jbegin_count) ;
@@ -632,7 +604,7 @@
goto research ;
}

- repeat = _allocate_block(&th, inode, &allocated_block_nr, tag, create);
+ repeat = _allocate_block(&th, block, inode, &allocated_block_nr, &path, create);

if (repeat == NO_DISK_SPACE) {
/* restart the transaction to give the journal a chance to free
@@ -640,7 +612,7 @@
** research if we succeed on the second try
*/
restart_transaction(&th, inode, &path) ;
- repeat = _allocate_block(&th, inode,&allocated_block_nr,tag,create);
+ repeat = _allocate_block(&th, block, inode, &allocated_block_nr, NULL, create);

if (repeat != NO_DISK_SPACE) {
goto research ;
@@ -791,10 +763,10 @@
add_to_flushlist(inode, unbh) ;

/* mark it dirty now to prevent commit_write from adding
- ** this buffer to the inode's dirty buffer list
- */
+ ** this buffer to the inode's dirty buffer list
+ */
__mark_buffer_dirty(unbh) ;
-
+
//inode->i_blocks += inode->i_sb->s_blocksize / 512;
//mark_tail_converted (inode);
} else {
@@ -1493,7 +1465,7 @@
directory) or reiserfs_new_symlink (to insert symlink body if new
object is symlink) or nothing (if new object is regular file) */
struct inode * reiserfs_new_inode (struct reiserfs_transaction_handle *th,
- const struct inode * dir, int mode,
+ struct inode * dir, int mode,
const char * symname,
int i_size, /* 0 for regular, EMTRY_DIR_SIZE for dirs,
strlen (symname) for symlinks)*/
@@ -1617,6 +1589,10 @@
set_inode_sd_version (inode, STAT_DATA_V2);

/* insert the stat data into the tree */
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ if (dir->u.reiserfs_i.new_packing_locality)
+ th->displace_new_blocks = 1;
+#endif
retval = reiserfs_insert_item (th, &path_to_key, &key, &ih, (char *)(&sd));
if (retval) {
iput (inode);
@@ -1625,6 +1601,10 @@
return NULL;
}

+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ if (!th->displace_new_blocks)
+ dir->u.reiserfs_i.new_packing_locality = 0;
+#endif
if (S_ISDIR(mode)) {
/* insert item with "." and ".." */
retval = reiserfs_new_directory (th, &ih, &path_to_key, dir);
@@ -1782,16 +1762,16 @@
reiserfs_update_inode_transaction(p_s_inode) ;
windex = push_journal_writer("reiserfs_vfs_truncate_file") ;
if (update_timestamps)
- /* we are doing real truncate: if the system crashes before the last
- transaction of truncating gets committed - on reboot the file
- either appears truncated properly or not truncated at all */
- add_save_link (&th, p_s_inode, 1);
+ /* we are doing real truncate: if the system crashes before the last
+ transaction of truncating gets committed - on reboot the file
+ either appears truncated properly or not truncated at all */
+ add_save_link (&th, p_s_inode, 1);
reiserfs_do_truncate (&th, p_s_inode, page, update_timestamps) ;
pop_journal_writer(windex) ;
journal_end(&th, p_s_inode->i_sb, JOURNAL_PER_BALANCE_CNT * 2 + 1 ) ;

if (update_timestamps)
- remove_save_link (p_s_inode, 1/* truncate */);
+ remove_save_link (p_s_inode, 1/* truncate */);

if (page) {
length = offset & (blocksize - 1) ;
@@ -2073,13 +2053,13 @@
*/
if (pos > inode->i_size) {
struct reiserfs_transaction_handle th ;
- lock_kernel() ;
+ lock_kernel();
journal_begin(&th, inode->i_sb, 1) ;
reiserfs_update_inode_transaction(inode) ;
inode->i_size = pos ;
reiserfs_update_sd(&th, inode) ;
journal_end(&th, inode->i_sb, 1) ;
- unlock_kernel() ;
+ unlock_kernel();
}

ret = generic_commit_write(f, page, from, to) ;
diff -Nru a/fs/reiserfs/journal.c b/fs/reiserfs/journal.c
--- a/fs/reiserfs/journal.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/journal.c Fri Aug 9 19:31:45 2002
@@ -508,14 +508,12 @@
**
*/
int reiserfs_in_journal(struct super_block *p_s_sb, kdev_t dev,
- unsigned long bl, int size, int search_all,
- unsigned long *next_zero_bit) {
+ int bmap_nr, int bit_nr, int size, int search_all,
+ unsigned int *next_zero_bit) {
struct reiserfs_journal_cnode *cn ;
struct reiserfs_list_bitmap *jb ;
int i ;
- int bmap_nr = bl / (p_s_sb->s_blocksize << 3) ;
- int bit_nr = bl % (p_s_sb->s_blocksize << 3) ;
- int tmp_bit ;
+ unsigned long bl;

*next_zero_bit = 0 ; /* always start this at zero. */

@@ -535,15 +533,15 @@
jb = SB_JOURNAL(p_s_sb)->j_list_bitmap + i ;
if (jb->journal_list && jb->bitmaps[bmap_nr] &&
test_bit(bit_nr, (unsigned long *)jb->bitmaps[bmap_nr]->data)) {
- tmp_bit = find_next_zero_bit((unsigned long *)
+ *next_zero_bit = find_next_zero_bit((unsigned long *)
(jb->bitmaps[bmap_nr]->data),
p_s_sb->s_blocksize << 3, bit_nr+1) ;
- *next_zero_bit = bmap_nr * (p_s_sb->s_blocksize << 3) + tmp_bit ;
return 1 ;
}
}
}

+ bl = bmap_nr * (p_s_sb->s_blocksize << 3) + bit_nr;
/* is it in any old transactions? */
if (search_all && (cn = get_journal_hash_dev(SB_JOURNAL(p_s_sb)->j_list_hash_table, dev,bl,size))) {
return 1;
@@ -1811,7 +1809,8 @@
jl = SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex ;

flush_commit_list(ct->p_s_sb, SB_JOURNAL_LIST(ct->p_s_sb) + ct->jindex, 1) ;
- if (jl->j_len > 0 && atomic_read(&(jl->j_nonzerolen)) > 0 &&
+
+ if (jl->j_len > 0 && atomic_read(&(jl->j_nonzerolen)) > 0 &&
atomic_read(&(jl->j_commit_left)) == 0) {
kupdate_one_transaction(ct->p_s_sb, jl) ;
}
diff -Nru a/fs/reiserfs/namei.c b/fs/reiserfs/namei.c
--- a/fs/reiserfs/namei.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/namei.c Fri Aug 9 19:31:45 2002
@@ -603,6 +603,10 @@
*/
INC_DIR_INODE_NLINK(dir)

+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ /* set flag that new packing locality created and new blocks for the content * of that directory are not displaced yet */
+ dir->u.reiserfs_i.new_packing_locality = 1;
+#endif
mode = S_IFDIR | mode;
inode = reiserfs_new_inode (&th, dir, mode, 0/*symlink*/,
old_format_only (dir->i_sb) ? EMPTY_DIR_SIZE_V1 : EMPTY_DIR_SIZE,
diff -Nru a/fs/reiserfs/procfs.c b/fs/reiserfs/procfs.c
--- a/fs/reiserfs/procfs.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/procfs.c Fri Aug 9 19:31:45 2002
@@ -118,7 +118,7 @@
#define SF( x ) ( r -> x )
#define SFP( x ) SF( s_proc_info_data.x )
#define SFPL( x ) SFP( x[ level ] )
-#define SFPF( x ) SFP( find_forward.x )
+#define SFPF( x ) SFP( scan_bitmap.x )
#define SFPJ( x ) SFP( journal.x )

#define D2C( x ) le16_to_cpu( x )
@@ -189,7 +189,7 @@
reiserfs_no_unhashed_relocation( sb ) ? "NO_UNHASHED_RELOCATION " : "",
reiserfs_hashed_relocation( sb ) ? "UNHASHED_RELOCATION " : "",
reiserfs_test4( sb ) ? "TEST4 " : "",
- dont_have_tails( sb ) ? "NO_TAILS " : "TAILS ",
+ have_large_tails( sb ) ? "TAILS " : have_small_tails(sb)?"SMALL_TAILS ":"NO_TAILS ",
replay_only( sb ) ? "REPLAY_ONLY " : "",
reiserfs_dont_log( sb ) ? "DONT_LOG " : "LOG ",
convert_reiserfs( sb ) ? "CONV " : "",
@@ -319,27 +319,30 @@
r = &sb->u.reiserfs_sb;

len += sprintf( &buffer[ len ], "free_block: %lu\n"
- "find_forward:"
- " wait"
- " bmap"
- " retry"
- " journal_hint"
- " journal_out"
+ " scan_bitmap:"
+ " wait"
+ " bmap"
+ " retry"
+ " stolen"
+ " journal_hint"
+ "journal_nohint"
"\n"
- " %12lu"
- " %12lu"
- " %12lu"
- " %12lu"
- " %12lu"
- " %12lu"
+ " %14lu"
+ " %14lu"
+ " %14lu"
+ " %14lu"
+ " %14lu"
+ " %14lu"
+ " %14lu"
"\n",
SFP( free_block ),
SFPF( call ),
SFPF( wait ),
SFPF( bmap ),
SFPF( retry ),
+ SFPF( stolen ),
SFPF( in_journal_hint ),
- SFPF( in_journal_out ) );
+ SFPF( in_journal_nohint ) );

procinfo_epilogue( sb );
return reiserfs_proc_tail( len, buffer, start, offset, count, eof );
diff -Nru a/fs/reiserfs/resize.c b/fs/reiserfs/resize.c
--- a/fs/reiserfs/resize.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/resize.c Fri Aug 9 19:31:45 2002
@@ -19,7 +19,8 @@
int reiserfs_resize (struct super_block * s, unsigned long block_count_new)
{
struct reiserfs_super_block * sb;
- struct buffer_head ** bitmap, * bh;
+ struct reiserfs_bitmap_info *bitmap;
+ struct buffer_head * bh;
struct reiserfs_transaction_handle th;
unsigned int bmap_nr_new, bmap_nr;
unsigned int block_r_new, block_r;
@@ -103,26 +104,26 @@

/* allocate additional bitmap blocks, reallocate array of bitmap
* block pointers */
- bitmap = reiserfs_kmalloc(sizeof(struct buffer_head *) * bmap_nr_new, GFP_KERNEL, s);
+ bitmap = vmalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
if (!bitmap) {
printk("reiserfs_resize: unable to allocate memory.\n");
return -ENOMEM;
}
for (i = 0; i < bmap_nr; i++)
- bitmap[i] = SB_AP_BITMAP(s)[i];
+ bitmap[i].bh = SB_AP_BITMAP(s)[i].bh;
for (i = bmap_nr; i < bmap_nr_new; i++) {
- bitmap[i] = getblk(s->s_dev, i * s->s_blocksize * 8, s->s_blocksize);
- memset(bitmap[i]->b_data, 0, sb->s_blocksize);
- reiserfs_test_and_set_le_bit(0, bitmap[i]->b_data);
-
- mark_buffer_dirty(bitmap[i]) ;
- mark_buffer_uptodate(bitmap[i], 1);
- ll_rw_block(WRITE, 1, bitmap + i);
- wait_on_buffer(bitmap[i]);
+ bitmap[i].bh = getblk(s->s_dev, i * s->s_blocksize * 8, s->s_blocksize);
+ memset(bitmap[i].bh->b_data, 0, sb->s_blocksize);
+ reiserfs_test_and_set_le_bit(0, bitmap[i].bh->b_data);
+
+ mark_buffer_dirty(bitmap[i].bh) ;
+ mark_buffer_uptodate(bitmap[i].bh, 1);
+ ll_rw_block(WRITE, 1, &bitmap[i].bh);
+ wait_on_buffer(bitmap[i].bh);
}
/* free old bitmap blocks array */
- reiserfs_kfree(SB_AP_BITMAP(s),
- sizeof(struct buffer_head *) * bmap_nr, s);
+ vfree(SB_AP_BITMAP(s));
+
SB_AP_BITMAP(s) = bitmap;
}

@@ -130,17 +131,17 @@
journal_begin(&th, s, 10);

/* correct last bitmap blocks in old and new disk layout */
- reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr - 1], 1);
+ 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]->b_data);
- journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr - 1]);
+ SB_AP_BITMAP(s)[bmap_nr - 1].bh->b_data);
+ journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr - 1].bh);

- reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr_new - 1], 1);
+ reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr_new - 1].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]->b_data);
- journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr_new - 1]);
+ 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);

/* update super */
reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1) ;
diff -Nru a/fs/reiserfs/stree.c b/fs/reiserfs/stree.c
--- a/fs/reiserfs/stree.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/stree.c Fri Aug 9 19:31:45 2002
@@ -1621,9 +1621,9 @@

do_balance(&s_cut_balance, NULL, NULL, c_mode);
if ( n_is_inode_locked ) {
- /* we've done an indirect->direct conversion. when the data block
- ** was freed, it was removed from the list of blocks that must
- ** be flushed before the transaction commits, so we don't need to
+ /* we've done an indirect->direct conversion. when the data block
+ ** was freed, it was removed from the list of blocks that must
+ ** be flushed before the transaction commits, so we don't need to
** deal with it here.
*/
p_s_inode->u.reiserfs_i.i_flags &= ~i_pack_on_close_mask;
@@ -1814,6 +1814,9 @@
int retval;

init_tb_struct(th, &s_paste_balance, th->t_super, p_s_search_path, n_pasted_size);
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ s_paste_balance.key = p_s_key->on_disk_key;
+#endif

while ( (retval = fix_nodes(M_PASTE, &s_paste_balance, NULL, p_c_body)) == REPEAT_SEARCH ) {
/* file system changed while we were in the fix_nodes */
@@ -1824,7 +1827,7 @@
goto error_out ;
}
if (retval == POSITION_FOUND) {
- reiserfs_warning ("PAP-5710: reiserfs_paste_into_item: entry or pasted byte (%K) exists", p_s_key);
+ reiserfs_warning ("PAP-5710: reiserfs_paste_into_item: entry or pasted byte (%K) exists\n", p_s_key);
retval = -EEXIST ;
goto error_out ;
}
@@ -1859,6 +1862,9 @@
int retval;

init_tb_struct(th, &s_ins_balance, th->t_super, p_s_path, IH_SIZE + ih_item_len(p_s_ih));
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ s_ins_balance.key = key->on_disk_key;
+#endif

/*
if (p_c_body == 0)
diff -Nru a/fs/reiserfs/super.c b/fs/reiserfs/super.c
--- a/fs/reiserfs/super.c Fri Aug 9 19:31:45 2002
+++ b/fs/reiserfs/super.c Fri Aug 9 19:31:45 2002
@@ -5,6 +5,7 @@
#include <linux/config.h>
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/vmalloc.h>
#include <asm/uaccess.h>
#include <linux/reiserfs_fs.h>
#include <linux/smp_lock.h>
@@ -329,9 +330,9 @@
journal_release(&th, s) ;

for (i = 0; i < SB_BMAP_NR (s); i ++)
- brelse (SB_AP_BITMAP (s)[i]);
+ brelse (SB_AP_BITMAP (s)[i].bh);

- reiserfs_kfree (SB_AP_BITMAP (s), sizeof (struct buffer_head *) * SB_BMAP_NR (s), s);
+ vfree (SB_AP_BITMAP (s));

brelse (SB_BUFFER_WITH_SB (s));

@@ -342,6 +343,11 @@
s->u.reiserfs_sb.s_kmallocs);
}

+ if (s->u.reiserfs_sb.reserved_blocks != 0) {
+ reiserfs_warning ("green-2005: reiserfs_put_super: reserved blocks left %d\n",
+ s->u.reiserfs_sb.reserved_blocks);
+ }
+
reiserfs_proc_unregister( s, "journal" );
reiserfs_proc_unregister( s, "oidmap" );
reiserfs_proc_unregister( s, "on-disk-super" );
@@ -433,6 +439,13 @@
{NULL, 0}
};

+const arg_desc_t tails[] = {
+ {"on", REISERFS_LARGETAIL},
+ {"off", -1},
+ {"small", REISERFS_SMALLTAIL},
+ {NULL, 0}
+};
+

/* proceed only one option from a list *cur - string containing of mount options
opts - array of options which are accepted
@@ -440,7 +453,7 @@
in the input - pointer to the argument is stored here
bit_flags - if option requires to set a certain bit - it is set here
return -1 if unknown option is found, opt->arg_required otherwise */
-static int reiserfs_getopt (char ** cur, opt_desc_t * opts, char ** opt_arg,
+static int reiserfs_getopt ( struct super_block * s, char ** cur, opt_desc_t * opts, char ** opt_arg,
unsigned long * bit_flags)
{
char * p;
@@ -462,11 +475,19 @@
*(*cur) = '\0';
(*cur) ++;
}
-
+
+ if ( !strncmp (p, "alloc=", 6) ) {
+ /* Ugly special case, probably we should redo options parser so that
+ it can understand several arguments for some options, also so that
+ it can fill several bitfields with option values. */
+ reiserfs_parse_alloc_options( s, p + 6);
+ return 0;
+ }
+
/* for every option in the list */
for (opt = opts; opt->option_name; opt ++) {
if (!strncmp (p, opt->option_name, strlen (opt->option_name))) {
- if (bit_flags && opt->bitmask)
+ if (bit_flags && opt->bitmask != -1 )
set_bit (opt->bitmask, bit_flags);
break;
}
@@ -515,7 +536,7 @@
/* values possible for this option are listed in opt->values */
for (arg = opt->values; arg->value; arg ++) {
if (!strcmp (p, arg->value)) {
- if (bit_flags && arg->bitmask)
+ if (bit_flags && arg->bitmask != -1 )
set_bit (arg->bitmask, bit_flags);
return opt->arg_required;
}
@@ -527,7 +548,7 @@

/* returns 0 if something is wrong in option string, 1 - otherwise */
-static int reiserfs_parse_options (char * options, /* string given via mount's -o */
+static int reiserfs_parse_options (struct super_block * s, char * options, /* string given via mount's -o */
unsigned long * mount_options,
/* after the parsing phase, contains the
collection of bitflags defining what
@@ -538,15 +559,16 @@
char * arg = NULL;
char * pos;
opt_desc_t opts[] = {
- {"notail", 0, 0, NOTAIL},
+ {"tails", 't', tails, -1},
+ {"notail", 0, 0, -1}, /* Compatibility stuff, so that -o notail for old setups still work */
{"conv", 0, 0, REISERFS_CONVERT},
- {"nolog", 0, 0, 0},
+ {"nolog", 0, 0, -1},
{"replayonly", 0, 0, REPLAYONLY},

- {"block-allocator", 'a', balloc, 0},
+ {"block-allocator", 'a', balloc, -1},
{"hash", 'h', hash, FORCE_HASH_DETECT},

- {"resize", 'r', 0, 0},
+ {"resize", 'r', 0, -1},
{NULL, 0, 0, 0}
};

@@ -555,9 +577,12 @@
/* use default configuration: create tails, journaling on, no
conversion to newest format */
return 1;
+ else
+ /* Drop defaults to zeroes */
+ *mount_options = 0;

for (pos = options; pos; ) {
- c = reiserfs_getopt (&pos, opts, &arg, mount_options);
+ c = reiserfs_getopt (s, &pos, opts, &arg, mount_options);
if (c == -1)
/* wrong option is given */
return 0;
@@ -612,7 +637,7 @@

rs = SB_DISK_SUPER_BLOCK (s);

- if (!reiserfs_parse_options(data, &mount_options, &blocks))
+ if (!reiserfs_parse_options(s, data, &mount_options, &blocks))
return 0;

#define SET_OPT( opt, bits, super ) \
@@ -620,7 +645,8 @@
( super ) -> u.reiserfs_sb.s_mount_opt |= ( 1 << ( opt ) )

/* set options in the super-block bitmask */
- SET_OPT( NOTAIL, mount_options, s );
+ SET_OPT( REISERFS_SMALLTAIL, mount_options, s );
+ SET_OPT( REISERFS_LARGETAIL, mount_options, s );
SET_OPT( REISERFS_NO_BORDER, mount_options, s );
SET_OPT( REISERFS_NO_UNHASHED_RELOCATION, mount_options, s );
SET_OPT( REISERFS_HASHED_RELOCATION, mount_options, s );
@@ -677,32 +703,84 @@
return 0;
}

+/* load_bitmap_info_data - Sets up the reiserfs_bitmap_info structure from disk.
+ * @sb - superblock for this filesystem
+ * @bi - the bitmap info to be loaded. Requires that bi->bh is valid.
+ *
+ * This routine counts how many free bits there are, finding the first zero
+ * as a side effect. Could also be implemented as a loop of test_bit() calls, or
+ * a loop of find_first_zero_bit() calls. This implementation is similar to
+ * find_first_zero_bit(), but doesn't return after it finds the first bit.
+ * Should only be called on fs mount, but should be fairly efficient anyways.
+ *
+ * bi->first_zero_hint is considered unset if it == 0, since the bitmap itself
+ * will * invariably occupt block 0 represented in the bitmap. The only
+ * exception to this is when free_count also == 0, since there will be no
+ * free blocks at all.
+ */
+static void load_bitmap_info_data (struct super_block *sb,
+ struct reiserfs_bitmap_info *bi)
+{
+ __u32 *cur = (__u32 *)bi->bh->b_data;
+
+ while ((char *)cur < (bi->bh->b_data + sb->s_blocksize)) {
+
+ /* No need to scan if all 0's or all 1's.
+ * Since we're only counting 0's, we can simply ignore all 1's */
+ if (*cur == 0) {
+ if (bi->first_zero_hint == 0) {
+ bi->first_zero_hint = ((char *)cur - bi->bh->b_data) << 3;
+ }
+ bi->free_count += 32;
+ } else if (*cur != ~0L) {
+ int b;
+ for (b = 0; b < 32; b++) {
+ if (!test_bit (b, cur)) {
+ bi->free_count ++;
+ if (bi->first_zero_hint == 0)
+ bi->first_zero_hint =
+ (((char *)cur - bi->bh->b_data) << 3) + b;
+ }
+ }
+ }
+ cur ++;
+ }
+
+#ifdef CONFIG_REISERFS_CHECK
+// This outputs a lot of unneded info on big FSes
+// reiserfs_warning ("bitmap loaded from block %d: %d free blocks\n",
+// bi->bh->b_blocknr, bi->free_count);
+#endif
+}

static int read_bitmaps (struct super_block * s)
{
int i, bmp;

- SB_AP_BITMAP (s) = reiserfs_kmalloc (sizeof (struct buffer_head *) * SB_BMAP_NR(s), GFP_NOFS, s);
+ SB_AP_BITMAP (s) = vmalloc (sizeof (struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
if (SB_AP_BITMAP (s) == 0)
return 1;
+ memset (SB_AP_BITMAP (s), 0, sizeof (struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
+
for (i = 0, bmp = REISERFS_DISK_OFFSET_IN_BYTES / s->s_blocksize + 1;
i < SB_BMAP_NR(s); i++, bmp = s->s_blocksize * 8 * i) {
- SB_AP_BITMAP (s)[i] = getblk (s->s_dev, bmp, s->s_blocksize);
- if (!buffer_uptodate(SB_AP_BITMAP(s)[i]))
- ll_rw_block(READ, 1, SB_AP_BITMAP(s) + i);
+ SB_AP_BITMAP (s)[i].bh = sb_getblk (s, bmp);
+ if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh))
+ ll_rw_block(READ, 1, &SB_AP_BITMAP(s)[i].bh);
}
for (i = 0; i < SB_BMAP_NR(s); i++) {
- wait_on_buffer(SB_AP_BITMAP (s)[i]);
- if (!buffer_uptodate(SB_AP_BITMAP(s)[i])) {
+ wait_on_buffer(SB_AP_BITMAP (s)[i].bh);
+ if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
reiserfs_warning("sh-2029: reiserfs read_bitmaps: "
"bitmap block (#%lu) reading failed\n",
- SB_AP_BITMAP(s)[i]->b_blocknr);
+ SB_AP_BITMAP(s)[i].bh->b_blocknr);
for (i = 0; i < SB_BMAP_NR(s); i++)
- brelse(SB_AP_BITMAP(s)[i]);
- reiserfs_kfree(SB_AP_BITMAP(s), sizeof(struct buffer_head *) * SB_BMAP_NR(s), s);
+ brelse(SB_AP_BITMAP(s)[i].bh);
+ vfree(SB_AP_BITMAP(s));
SB_AP_BITMAP(s) = NULL;
return 1;
}
+ load_bitmap_info_data (s, SB_AP_BITMAP (s) + i);
}
return 0;
}
@@ -714,16 +792,17 @@
int bmp1 = (REISERFS_OLD_DISK_OFFSET_IN_BYTES / s->s_blocksize) + 1; /* first of bitmap blocks */

/* read true bitmap */
- SB_AP_BITMAP (s) = reiserfs_kmalloc (sizeof (struct buffer_head *) * sb_bmap_nr(rs), GFP_NOFS, s);
+ SB_AP_BITMAP (s) = vmalloc (sizeof (struct reiserfs_buffer_info *) * sb_bmap_nr(rs));
if (SB_AP_BITMAP (s) == 0)
return 1;

- memset (SB_AP_BITMAP (s), 0, sizeof (struct buffer_head *) * sb_bmap_nr(rs));
+ memset (SB_AP_BITMAP (s), 0, sizeof (struct reiserfs_buffer_info *) * sb_bmap_nr(rs));

for (i = 0; i < sb_bmap_nr(rs); i ++) {
- SB_AP_BITMAP (s)[i] = reiserfs_bread (s, bmp1 + i, s->s_blocksize);
- if (!SB_AP_BITMAP (s)[i])
+ SB_AP_BITMAP (s)[i].bh = reiserfs_bread (s, bmp1 + i, s->s_blocksize);
+ if (!SB_AP_BITMAP (s)[i].bh)
return 1;
+ load_bitmap_info_data (s, SB_AP_BITMAP (s) + i);
}

return 0;
@@ -736,7 +815,7 @@
char * buf;

while (i < SB_BLOCK_COUNT (s)) {
- buf = SB_AP_BITMAP (s)[i / (s->s_blocksize * 8)]->b_data;
+ buf = SB_AP_BITMAP (s)[i / (s->s_blocksize * 8)].bh->b_data;
if (!reiserfs_test_le_bit (i % (s->s_blocksize * 8), buf))
free ++;
i ++;
@@ -848,10 +927,11 @@
}

for (i = 0; i < SB_BMAP_NR(s) ; i++) {
- ll_rw_block(READ, 1, &(SB_AP_BITMAP(s)[i])) ;
- wait_on_buffer(SB_AP_BITMAP(s)[i]) ;
- if (!buffer_uptodate(SB_AP_BITMAP(s)[i])) {
- printk("reread_meta_blocks, error reading bitmap block number %d at %ld\n", i, SB_AP_BITMAP(s)[i]->b_blocknr) ;
+ ll_rw_block(READ, 1, &(SB_AP_BITMAP(s)[i].bh)) ;
+ wait_on_buffer(SB_AP_BITMAP(s)[i].bh) ;
+ if (!buffer_uptodate(SB_AP_BITMAP(s)[i].bh)) {
+ printk("reread_meta_blocks, error reading bitmap block number %d at
+ %ld\n", i, SB_AP_BITMAP(s)[i].bh->b_blocknr) ;
return 1 ;
}
}
@@ -1033,7 +1113,12 @@

memset (&s->u.reiserfs_sb, 0, sizeof (struct reiserfs_sb_info));

- if (reiserfs_parse_options ((char *) data, &(s->u.reiserfs_sb.s_mount_opt), &blocks) == 0) {
+ /* Set default values for options: non-aggressive tails */
+ s->u.reiserfs_sb.s_mount_opt = ( 1 << REISERFS_SMALLTAIL );
+ /* default block allocator option: skip_busy */
+ s->u.reiserfs_sb.s_alloc_options.bits = ( 1 << 5);
+
+ if (reiserfs_parse_options (s, (char *) data, &(s->u.reiserfs_sb.s_mount_opt), &blocks) == 0) {
return NULL;
}

@@ -1183,10 +1268,10 @@
if (SB_DISK_SUPER_BLOCK (s)) {
for (j = 0; j < SB_BMAP_NR (s); j ++) {
if (SB_AP_BITMAP (s))
- brelse (SB_AP_BITMAP (s)[j]);
+ brelse (SB_AP_BITMAP (s)[j].bh);
}
if (SB_AP_BITMAP (s))
- reiserfs_kfree (SB_AP_BITMAP (s), sizeof (struct buffer_head *) * SB_BMAP_NR (s), s);
+ vfree (SB_AP_BITMAP (s));
}
if (SB_BUFFER_WITH_SB (s))
brelse(SB_BUFFER_WITH_SB (s));
diff -Nru a/include/linux/reiserfs_fs.h b/include/linux/reiserfs_fs.h
--- a/include/linux/reiserfs_fs.h Fri Aug 9 19:31:45 2002
+++ b/include/linux/reiserfs_fs.h Fri Aug 9 19:31:45 2002
@@ -55,6 +55,7 @@
#define USE_INODE_GENERATION_COUNTER

#define REISERFS_PREALLOCATE
+#define DISPLACE_NEW_PACKING_LOCALITIES
#define PREALLOCATION_SIZE 8

/* n must be power of 2 */
@@ -184,7 +185,7 @@
time cost for a 4 block file and saves an amount of space that is
less significant as a percentage of space, or so goes the hypothesis.
-Hans */
-#define STORE_TAIL_IN_UNFM(n_file_size,n_tail_size,n_block_size) \
+#define STORE_TAIL_IN_UNFM_S1(n_file_size,n_tail_size,n_block_size) \
(\
(!(n_tail_size)) || \
(((n_tail_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) || \
@@ -197,6 +198,18 @@
( (n_tail_size) >= (MAX_DIRECT_ITEM_LEN(n_block_size) * 3)/4) ) ) \
)

+/* Another strategy for tails, this one means only create a tail if all the
+ file would fit into one DIRECT item.
+ Primary intention for this one is to increase performance by decreasing
+ seeking.
+*/
+#define STORE_TAIL_IN_UNFM_S2(n_file_size,n_tail_size,n_block_size) \
+(\
+ (!(n_tail_size)) || \
+ (((n_file_size) > MAX_DIRECT_ITEM_LEN(n_block_size)) ) \
+)
+
+

/*
* values for s_state field
@@ -1323,6 +1336,10 @@

int fs_gen; /* saved value of `reiserfs_generation' counter
see FILESYSTEM_CHANGED() macro in reiserfs_fs.h */
+#ifdef DISPLACE_NEW_PACKING_LOCALITIES
+ struct key key; /* key pointer, to pass to block allocator or
+ another low-level subsystem */
+#endif
} ;

/* These are modes of balancing */
@@ -1558,7 +1575,7 @@
int push_journal_writer(char *w) ;
int pop_journal_writer(int windex) ;
int journal_transaction_should_end(struct reiserfs_transaction_handle *, int) ;
-int reiserfs_in_journal(struct super_block *p_s_sb, kdev_t dev, unsigned long bl, int size, int searchall, unsigned long *next) ;
+int reiserfs_in_journal(struct super_block *p_s_sb, kdev_t dev, int bmap_nr, int bit_nr, int size, int searchall, unsigned int *next) ;
int journal_begin(struct reiserfs_transaction_handle *, struct super_block *p_s_sb, unsigned long) ;
struct super_block *reiserfs_get_super(kdev_t dev) ;
void flush_async_commits(struct super_block *p_s_sb) ;
@@ -1706,8 +1723,8 @@
#define file_size(inode) ((inode)->i_size)
#define tail_size(inode) (file_size (inode) & (block_size (inode) - 1))

-#define tail_has_to_be_packed(inode) (!dont_have_tails ((inode)->i_sb) &&\
-!STORE_TAIL_IN_UNFM(file_size (inode), tail_size(inode), block_size (inode)))
+#define tail_has_to_be_packed(inode) (have_large_tails ((inode)->i_sb)?\
+!STORE_TAIL_IN_UNFM_S1(file_size (inode), tail_size(inode), block_size (inode)):have_small_tails ((inode)->i_sb)?!STORE_TAIL_IN_UNFM_S2(file_size (inode), tail_size(inode), block_size (inode)):0 )

void padd_item (char * item, int total_length, int length);

@@ -1733,7 +1750,7 @@

struct inode * reiserfs_new_inode (struct reiserfs_transaction_handle *th,
- const struct inode * dir, int mode,
+ struct inode * dir, int mode,
const char * symname, int item_len,
struct dentry *dentry, struct inode *inode, int * err);
int reiserfs_sync_inode (struct reiserfs_transaction_handle *th, struct inode * inode);
@@ -1909,22 +1926,87 @@
struct buffer_head * get_FEB (struct tree_balance *);

/* bitmap.c */
+
+/* structure contains hints for block allocator, and it is a container for
+ * arguments, such as node, search path, transaction_handle, etc. */
+ struct __reiserfs_blocknr_hint {
+ struct inode * inode; /* inode passed to allocator, if we allocate unf. nodes */
+ long block; /* file offset, in blocks */
+ struct key key;
+ struct path * path; /* search path, used by allocator to deternine search_start by
+ * various ways */
+ struct reiserfs_transaction_handle * th; /* transaction handle is needed to log super blocks and
+ * bitmap blocks changes */
+ b_blocknr_t beg, end;
+ b_blocknr_t search_start; /* a field used to transfer search start value (block number)
+ * between different block allocator procedures
+ * (determine_search_start() and others) */
+ int prealloc_size; /* is set in determine_prealloc_size() function, used by underlayed
+ * function that do actual allocation */
+
+ int formatted_node:1; /* the allocator uses different polices for getting disk space for
+ * formatted/unformatted blocks with/without preallocation */
+ int preallocate:1;
+};
+
+typedef struct __reiserfs_blocknr_hint reiserfs_blocknr_hint_t;
+
+int reiserfs_parse_alloc_options (struct super_block *, char *);
int is_reusable (struct super_block * s, unsigned long block, int bit_value);
void reiserfs_free_block (struct reiserfs_transaction_handle *th, unsigned long);
-int reiserfs_new_blocknrs (struct reiserfs_transaction_handle *th,
- unsigned long * pblocknrs, unsigned long start_from, int amount_needed);
-int reiserfs_new_unf_blocknrs (struct reiserfs_transaction_handle *th,
- unsigned long * pblocknr, unsigned long start_from);
+int reiserfs_allocate_blocknrs(reiserfs_blocknr_hint_t *, b_blocknr_t * , int, int);
+extern inline int reiserfs_new_form_blocknrs (struct tree_balance * tb,
+ b_blocknr_t *new_blocknrs, int amount_needed)
+{
+ reiserfs_blocknr_hint_t hint = {
+ th:tb->transaction_handle,
+ path: tb->tb_path,
+ inode: NULL,
+ key: tb->key,
+ block: 0,
+ formatted_node:1
+ };
+ return reiserfs_allocate_blocknrs(&hint, new_blocknrs, amount_needed, 0);
+}
+
+extern inline int reiserfs_new_unf_blocknrs (struct reiserfs_transaction_handle *th,
+ b_blocknr_t *new_blocknrs,
+ struct path * path, long block)
+{
+ reiserfs_blocknr_hint_t hint = {
+ th: th,
+ path: path,
+ inode: NULL,
+ block: block,
+ formatted_node: 0,
+ preallocate: 0
+ };
+ return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
+}
+
#ifdef REISERFS_PREALLOCATE
-int reiserfs_new_unf_blocknrs2 (struct reiserfs_transaction_handle *th,
- struct inode * inode,
- unsigned long * pblocknr,
- unsigned long start_from);
+extern inline int reiserfs_new_unf_blocknrs2(struct reiserfs_transaction_handle *th,
+ struct inode * inode,
+ b_blocknr_t *new_blocknrs,
+ struct path * path, long block)
+{
+ reiserfs_blocknr_hint_t hint = {
+ th: th,
+ path: path,
+ inode: inode,
+ block: block,
+ formatted_node: 0,
+ preallocate: 1
+ };
+ return reiserfs_allocate_blocknrs(&hint, new_blocknrs, 1, 0);
+}

void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th,
struct inode * inode);
void reiserfs_discard_all_prealloc (struct reiserfs_transaction_handle *th);
#endif
+void reiserfs_claim_blocks_to_be_allocated( struct super_block *sb, int blocks);
+void reiserfs_release_claimed_blocks( struct super_block *sb, int blocks);

/* hashes.c */
__u32 keyed_hash (const signed char *msg, int len);
diff -Nru a/include/linux/reiserfs_fs_i.h b/include/linux/reiserfs_fs_i.h
--- a/include/linux/reiserfs_fs_i.h Fri Aug 9 19:31:45 2002
+++ b/include/linux/reiserfs_fs_i.h Fri Aug 9 19:31:45 2002
@@ -44,6 +44,10 @@
struct list_head i_prealloc_list; /* per-transaction list of inodes which
* have preallocated blocks */

+ int new_packing_locality:1; /* new_packig_locality is created; new blocks
+ * for the contents of this directory should be
+ * displaced */
+
/* we use these for fsync or O_SYNC to decide which transaction
** needs to be committed in order for this inode to be properly
** flushed */
diff -Nru a/include/linux/reiserfs_fs_sb.h b/include/linux/reiserfs_fs_sb.h
--- a/include/linux/reiserfs_fs_sb.h Fri Aug 9 19:31:45 2002
+++ b/include/linux/reiserfs_fs_sb.h Fri Aug 9 19:31:45 2002
@@ -241,6 +241,8 @@
unsigned long t_trans_id ; /* sanity check, equals the current trans id */
struct super_block *t_super ; /* super for this FS when journal_begin was
called. saves calls to reiserfs_get_super */
+ int displace_new_blocks:1; /* if new block allocation occurres, that block
+ should be displaced from others */
} ;

/*
@@ -324,6 +326,14 @@

typedef __u32 (*hashf_t) (const signed char *, int);

+struct reiserfs_bitmap_info
+{
+ // FIXME: Won't work with block sizes > 8K
+ __u16 first_zero_hint;
+ __u16 free_count;
+ struct buffer_head *bh; /* the actual bitmap */
+};
+
struct proc_dir_entry;

#if defined( CONFIG_PROC_FS ) && defined( CONFIG_REISERFS_PROC_INFO )
@@ -368,14 +378,15 @@
stat_cnt_t need_r_neighbor[ 5 ];

stat_cnt_t free_block;
- struct __find_forward_stats {
+ struct __scan_bitmap_stats {
stat_cnt_t call;
stat_cnt_t wait;
stat_cnt_t bmap;
stat_cnt_t retry;
stat_cnt_t in_journal_hint;
- stat_cnt_t in_journal_out;
- } find_forward;
+ stat_cnt_t in_journal_nohint;
+ stat_cnt_t stolen;
+ } scan_bitmap;
struct __journal_stats {
stat_cnt_t in_journal;
stat_cnt_t in_journal_bitmap;
@@ -405,7 +416,7 @@
/* both the comment and the choice of
name are unclear for s_rs -Hans */
struct reiserfs_super_block * s_rs; /* Pointer to the super block in the buffer */
- struct buffer_head ** s_ap_bitmap; /* array of buffers, holding block bitmap */
+ struct reiserfs_bitmap_info * s_ap_bitmap;
struct reiserfs_journal *s_journal ; /* pointer to journal information */
unsigned short s_mount_state; /* reiserfs state (valid, invalid) */

@@ -418,6 +429,16 @@
here (currently - NOTAIL, NOLOG,
REPLAYONLY) */

+ struct { /* This is a structure that describes block allocator options */
+ unsigned long bits; /* Bitfield for enable/disable kind of options */
+ unsigned long large_file_size; /* size started from which we consider file to be a large one(in blocks) */
+ int border; /* percentage of disk, border takes */
+ int preallocmin; /* Minimal file size (in blocks) starting from which we do preallocations */
+ int preallocsize; /* Number of blocks we try to prealloc when file
+ reaches preallocmin size (in blocks) or
+ prealloc_list is empty. */
+ } s_alloc_options;
+
/* Comment? -Hans */
wait_queue_head_t s_wait;
/* To be obsoleted soon by per buffer seals.. -Hans */
@@ -444,6 +465,7 @@
int s_is_unlinked_ok;
reiserfs_proc_info_data_t s_proc_info_data;
struct proc_dir_entry *procdir;
+ int reserved_blocks; /* amount of blocks reserved for further allocations */
};

/* Definitions of reiserfs on-disk properties: */
@@ -451,7 +473,8 @@
#define REISERFS_3_6 1

/* Mount options */
-#define NOTAIL 0 /* -o notail: no tails will be created in a session */
+#define REISERFS_LARGETAIL 0 /* large tails will be created in a session */
+#define REISERFS_SMALLTAIL 17 /* small (for files less than block size) tails will be created in a session */
#define REPLAYONLY 3 /* replay journal and return 0. Use by fsck */
#define REISERFS_NOLOG 4 /* -o nolog: turn journalling off */
#define REISERFS_CONVERT 5 /* -o conv: causes conversion of old
@@ -499,7 +522,8 @@
#define reiserfs_hashed_relocation(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_HASHED_RELOCATION))
#define reiserfs_test4(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_TEST4))

-#define dont_have_tails(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << NOTAIL))
+#define have_large_tails(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_LARGETAIL))
+#define have_small_tails(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_SMALLTAIL))
#define replay_only(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REPLAYONLY))
#define reiserfs_dont_log(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_NOLOG))
#define reiserfs_attrs(s) ((s)->u.reiserfs_sb.s_mount_opt & (1 << REISERFS_ATTRS))