diff options
Diffstat (limited to 'fs/reiserfs/bitmap.c')
| -rw-r--r-- | fs/reiserfs/bitmap.c | 2122 |
1 files changed, 1210 insertions, 912 deletions
diff --git a/fs/reiserfs/bitmap.c b/fs/reiserfs/bitmap.c index 49c479c9454..dc198bc64c6 100644 --- a/fs/reiserfs/bitmap.c +++ b/fs/reiserfs/bitmap.c @@ -3,16 +3,15 @@ */ /* Reiserfs block (de)allocator, bitmap-based. */ -#include <linux/config.h> #include <linux/time.h> -#include <linux/reiserfs_fs.h> +#include "reiserfs.h" #include <linux/errno.h> #include <linux/buffer_head.h> #include <linux/kernel.h> #include <linux/pagemap.h> -#include <linux/reiserfs_fs_sb.h> -#include <linux/reiserfs_fs_i.h> +#include <linux/vmalloc.h> #include <linux/quotaops.h> +#include <linux/seq_file.h> #define PREALLOCATION_SIZE 9 @@ -40,1131 +39,1430 @@ #define SET_OPTION(optname) \ do { \ - reiserfs_warning(s, "reiserfs: option \"%s\" is set", #optname); \ - set_bit(_ALLOC_ ## optname , &SB_ALLOC_OPTS(s)); \ + reiserfs_info(s, "block allocator option \"%s\" is set", #optname); \ + set_bit(_ALLOC_ ## optname , &SB_ALLOC_OPTS(s)); \ } while(0) #define TEST_OPTION(optname, s) \ test_bit(_ALLOC_ ## optname , &SB_ALLOC_OPTS(s)) -static inline void get_bit_address (struct super_block * s, - b_blocknr_t block, int * bmap_nr, int * offset) +static inline void get_bit_address(struct super_block *s, + b_blocknr_t block, + unsigned int *bmap_nr, + unsigned 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; + /* + * 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_bits + 3); + /* Within that bitmap block it is located at bit offset *offset. */ + *offset = block & ((s->s_blocksize << 3) - 1); } -#ifdef CONFIG_REISERFS_CHECK -int is_reusable (struct super_block * s, b_blocknr_t block, int bit_value) +int is_reusable(struct super_block *s, b_blocknr_t block, int bit_value) { - int i, j; - - if (block == 0 || block >= SB_BLOCK_COUNT (s)) { - reiserfs_warning (s, "vs-4010: is_reusable: block number is out of range %lu (%u)", - block, SB_BLOCK_COUNT (s)); - return 0; - } - - /* 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].bh->b_blocknr) { - reiserfs_warning (s, "vs: 4020: is_reusable: " - "bitmap block %lu(%u) can't be freed or reused", - block, SB_BMAP_NR (s)); - return 0; + unsigned int bmap, offset; + unsigned int bmap_count = reiserfs_bmap_count(s); + + if (block == 0 || block >= SB_BLOCK_COUNT(s)) { + reiserfs_error(s, "vs-4010", + "block number is out of range %lu (%u)", + block, SB_BLOCK_COUNT(s)); + return 0; } - - get_bit_address (s, block, &i, &j); - if (i >= SB_BMAP_NR (s)) { - reiserfs_warning (s, "vs-4030: is_reusable: there is no so many bitmap blocks: " - "block=%lu, bitmap_nr=%d", block, i); - return 0; - } + get_bit_address(s, block, &bmap, &offset); - 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)) { - 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)); + /* + * Old format filesystem? Unlikely, but the bitmaps are all + * up front so we need to account for it. + */ + if (unlikely(test_bit(REISERFS_OLD_FORMAT, + &REISERFS_SB(s)->s_properties))) { + b_blocknr_t bmap1 = REISERFS_SB(s)->s_sbh->b_blocknr + 1; + if (block >= bmap1 && + block <= bmap1 + bmap_count) { + reiserfs_error(s, "vs-4019", "bitmap block %lu(%u) " + "can't be freed or reused", + block, bmap_count); + return 0; + } + } else { + if (offset == 0) { + reiserfs_error(s, "vs-4020", "bitmap block %lu(%u) " + "can't be freed or reused", + block, bmap_count); + return 0; + } + } - return 0; - } + if (bmap >= bmap_count) { + reiserfs_error(s, "vs-4030", "bitmap for requested block " + "is out of range: block=%lu, bitmap_nr=%u", + block, bmap); + return 0; + } - if (bit_value == 0 && block == SB_ROOT_BLOCK (s)) { - reiserfs_warning (s, "vs-4050: is_reusable: this is root block (%u), " - "it must be busy", SB_ROOT_BLOCK (s)); - return 0; - } + if (bit_value == 0 && block == SB_ROOT_BLOCK(s)) { + reiserfs_error(s, "vs-4050", "this is root block (%u), " + "it must be busy", SB_ROOT_BLOCK(s)); + return 0; + } - return 1; + 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) +/* + * 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, unsigned int bmap, + int off, int *next) { - b_blocknr_t tmp; - - if (reiserfs_in_journal (s, bmap, off, 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 ); + b_blocknr_t tmp; + + if (reiserfs_in_journal(s, bmap, off, 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; } - PROC_INFO_INC( s, scan_bitmap.retry ); - return 1; - } - return 0; + 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) +/* + * 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, + unsigned 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; - - BUG_ON (!th->t_trans_id); - - RFALSE(bmap_n >= SB_BMAP_NR (s), "Bitmap %d is out of range (0..%d)",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. */ - - if ( !bi ) { - reiserfs_warning (s, "NULL bitmap info pointer for bitmap %d", bmap_n); - return 0; - } - if (buffer_locked (bi->bh)) { - PROC_INFO_INC( s, scan_bitmap.wait ); - __wait_on_buffer (bi->bh); - } - - 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); - - 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; + 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; + + BUG_ON(!th->t_trans_id); + RFALSE(bmap_n >= reiserfs_bmap_count(s), "Bitmap %u is out of " + "range (0..%u)", bmap_n, reiserfs_bmap_count(s) - 1); + PROC_INFO_INC(s, scan_bitmap.bmap); + + if (!bi) { + reiserfs_error(s, "jdm-4055", "NULL bitmap info pointer " + "for bitmap %d", bmap_n); + 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; - } + bh = reiserfs_read_bitmap_block(s, bmap_n); + if (bh == NULL) + return 0; - /* 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 = org; - /* ... and search again in current block from beginning */ - goto cont; + while (1) { +cont: + if (bi->free_count < min) { + brelse(bh); + return 0; /* No free blocks in this bitmap */ } - } - bi->free_count -= (end - *beg); - 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)); + /* search for a first zero bit -- beginning of a window */ + *beg = reiserfs_find_next_zero_le_bit + ((unsigned long *)(bh->b_data), boundary, *beg); + + /* + * search for a zero bit fails or the rest of bitmap block + * cannot contain a zero window of minimum size + */ + if (*beg + min > boundary) { + brelse(bh); + return 0; + } - return end - (*beg); - } else { - *beg = next; + 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, 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 + */ + + /* found window of proper size */ + if (end - *beg >= min) { + int i; + reiserfs_prepare_for_journal(s, bh, 1); + /* + * try to set all blocks used checking are + * they still free + */ + for (i = *beg; i < end; i++) { + /* Don't check in journal again. */ + if (reiserfs_test_and_set_le_bit + (i, bh->b_data)) { + /* + * bit was set by another process while + * we slept in prepare_for_journal() + */ + PROC_INFO_INC(s, scan_bitmap.stolen); + + /* + * we can continue with smaller set + * of allocated blocks, if length of + * this set is more or equal to `min' + */ + if (i >= *beg + min) { + end = i; + break; + } + + /* + * otherwise we clear all bit + * were set ... + */ + while (--i >= *beg) + reiserfs_clear_le_bit + (i, bh->b_data); + reiserfs_restore_prepared_buffer(s, bh); + *beg = org; + + /* + * Search again in current block + * from beginning + */ + goto cont; + } + } + bi->free_count -= (end - *beg); + journal_mark_dirty(th, bh); + brelse(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, SB_BUFFER_WITH_SB(s)); + + return end - (*beg); + } else { + *beg = next; + } } - } } -static int bmap_hash_id(struct super_block *s, u32 id) { - char * hash_in = NULL; - unsigned long hash; - unsigned bm; - - if (id <= 2) { - bm = 1; - } else { - hash_in = (char *)(&id); - hash = keyed_hash(hash_in, 4); - bm = hash % SB_BMAP_NR(s); - if (!bm) - bm = 1; - } - /* this can only be true when SB_BMAP_NR = 1 */ - if (bm >= SB_BMAP_NR(s)) - bm = 0; - return bm; +static int bmap_hash_id(struct super_block *s, u32 id) +{ + char *hash_in = NULL; + unsigned long hash; + unsigned bm; + + if (id <= 2) { + bm = 1; + } else { + hash_in = (char *)(&id); + hash = keyed_hash(hash_in, 4); + bm = hash % reiserfs_bmap_count(s); + if (!bm) + bm = 1; + } + /* this can only be true when SB_BMAP_NR = 1 */ + if (bm >= reiserfs_bmap_count(s)) + bm = 0; + return bm; } /* * hashes the id and then returns > 0 if the block group for the * corresponding hash is full */ -static inline int block_group_used(struct super_block *s, u32 id) { - int bm; - bm = bmap_hash_id(s, id); - if (SB_AP_BITMAP(s)[bm].free_count > ((s->s_blocksize << 3) * 60 / 100) ) { - return 0; - } - return 1; +static inline int block_group_used(struct super_block *s, u32 id) +{ + int bm = bmap_hash_id(s, id); + struct reiserfs_bitmap_info *info = &SB_AP_BITMAP(s)[bm]; + + /* + * If we don't have cached information on this bitmap block, we're + * going to have to load it later anyway. Loading it here allows us + * to make a better decision. This favors long-term performance gain + * with a better on-disk layout vs. a short term gain of skipping the + * read and potentially having a bad placement. + */ + if (info->free_count == UINT_MAX) { + struct buffer_head *bh = reiserfs_read_bitmap_block(s, bm); + brelse(bh); + } + + if (info->free_count > ((s->s_blocksize << 3) * 60 / 100)) { + return 0; + } + return 1; } /* * the packing is returned in disk byte order */ -__le32 reiserfs_choose_packing(struct inode *dir) -{ - __le32 packing; - if (TEST_OPTION(packing_groups, dir->i_sb)) { - u32 parent_dir = le32_to_cpu(INODE_PKEY(dir)->k_dir_id); - /* - * some versions of reiserfsck expect packing locality 1 to be - * special - */ - if (parent_dir == 1 || block_group_used(dir->i_sb,parent_dir)) - packing = INODE_PKEY(dir)->k_objectid; - else - packing = INODE_PKEY(dir)->k_dir_id; - } else - packing = INODE_PKEY(dir)->k_objectid; - return packing; -} - -/* 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, - b_blocknr_t *start, b_blocknr_t finish, - int min, int max, int unfm, unsigned long file_block) +__le32 reiserfs_choose_packing(struct inode * dir) { - 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; - - BUG_ON (!th->t_trans_id); - - 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); - if (bm > SB_BMAP_NR(s)) - return 0; - if (end_bm > SB_BMAP_NR(s)) - end_bm = SB_BMAP_NR(s); - - /* When the bitmap is more than 10% free, anyone can allocate. - * When it's less than 10% free, only files that already use the - * bitmap are allowed. Once we pass 80% full, this restriction - * is lifted. - * - * We do this so that files that grow later still have space close to - * their original allocation. This improves locality, and presumably - * performance as a result. - * - * This is only an allocation policy and does not make up for getting a - * bad hint. Decent hinting must be implemented for this to work well. - */ - 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; - } - /* we know from above that start is a reasonable number */ - 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); - - ret: - *start = bm * off_max + off; - return nr_allocated; - + __le32 packing; + if (TEST_OPTION(packing_groups, dir->i_sb)) { + u32 parent_dir = le32_to_cpu(INODE_PKEY(dir)->k_dir_id); + /* + * some versions of reiserfsck expect packing locality 1 to be + * special + */ + if (parent_dir == 1 || block_group_used(dir->i_sb, parent_dir)) + packing = INODE_PKEY(dir)->k_objectid; + else + packing = INODE_PKEY(dir)->k_dir_id; + } else + packing = INODE_PKEY(dir)->k_objectid; + return packing; } -static void _reiserfs_free_block (struct reiserfs_transaction_handle *th, - struct inode *inode, b_blocknr_t block, - int for_unformatted) +/* + * 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, + b_blocknr_t * start, b_blocknr_t finish, + int min, int max, int unfm, sector_t file_block) { - struct super_block * s = th->t_super; - struct reiserfs_super_block * rs; - struct buffer_head * sbh; - struct reiserfs_bitmap_info *apbi; - int nr, offset; + int nr_allocated = 0; + struct super_block *s = th->t_super; + unsigned int bm, off; + unsigned int end_bm, end_off; + unsigned int off_max = s->s_blocksize << 3; + + BUG_ON(!th->t_trans_id); + PROC_INFO_INC(s, scan_bitmap.call); + + /* No point in looking for more free blocks */ + if (SB_FREE_BLOCKS(s) <= 0) + return 0; + + get_bit_address(s, *start, &bm, &off); + get_bit_address(s, finish, &end_bm, &end_off); + if (bm > reiserfs_bmap_count(s)) + return 0; + if (end_bm > reiserfs_bmap_count(s)) + end_bm = reiserfs_bmap_count(s); - BUG_ON (!th->t_trans_id); + /* + * When the bitmap is more than 10% free, anyone can allocate. + * When it's less than 10% free, only files that already use the + * bitmap are allowed. Once we pass 80% full, this restriction + * is lifted. + * + * We do this so that files that grow later still have space close to + * their original allocation. This improves locality, and presumably + * performance as a result. + * + * This is only an allocation policy and does not make up for getting a + * bad hint. Decent hinting must be implemented for this to work well. + */ + 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; + } + /* we know from above that start is a reasonable number */ + get_bit_address(s, *start, &bm, &off); + } - PROC_INFO_INC( s, free_block ); + 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; + } - rs = SB_DISK_SUPER_BLOCK (s); - sbh = SB_BUFFER_WITH_SB (s); - apbi = SB_AP_BITMAP(s); + nr_allocated = + scan_bitmap_block(th, bm, &off, end_off + 1, min, max, unfm); - get_bit_address (s, block, &nr, &offset); +ret: + *start = bm * off_max + off; + return nr_allocated; - if (nr >= sb_bmap_nr (rs)) { - reiserfs_warning (s, "vs-4075: reiserfs_free_block: " - "block %lu is out of range on %s", - block, reiserfs_bdevname (s)); - return; - } - - 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 (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); - - 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); - if (for_unformatted) - DQUOT_FREE_BLOCK_NODIRTY(inode, 1); } -void reiserfs_free_block (struct reiserfs_transaction_handle *th, - struct inode *inode, b_blocknr_t block, - int for_unformatted) +static void _reiserfs_free_block(struct reiserfs_transaction_handle *th, + struct inode *inode, b_blocknr_t block, + int for_unformatted) { - struct super_block * s = th->t_super; + struct super_block *s = th->t_super; + struct reiserfs_super_block *rs; + struct buffer_head *sbh, *bmbh; + struct reiserfs_bitmap_info *apbi; + unsigned int nr, offset; + + BUG_ON(!th->t_trans_id); + PROC_INFO_INC(s, free_block); + 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 >= reiserfs_bmap_count(s)) { + reiserfs_error(s, "vs-4075", "block %lu is out of range", + block); + return; + } + + bmbh = reiserfs_read_bitmap_block(s, nr); + if (!bmbh) + return; - BUG_ON (!th->t_trans_id); + reiserfs_prepare_for_journal(s, bmbh, 1); - RFALSE(!s, "vs-4061: trying to free block on nonexistent device"); - RFALSE(is_reusable (s, block, 1) == 0, "vs-4071: can not free such block"); - /* mark it before we clear it, just in case */ - journal_mark_freed(th, s, block) ; - _reiserfs_free_block(th, inode, block, for_unformatted) ; + /* clear bit for the given block in bit map */ + if (!reiserfs_test_and_clear_le_bit(offset, bmbh->b_data)) { + reiserfs_error(s, "vs-4080", + "block %lu: bit already cleared", block); + } + apbi[nr].free_count++; + journal_mark_dirty(th, bmbh); + brelse(bmbh); + + reiserfs_prepare_for_journal(s, sbh, 1); + /* update super block */ + set_sb_free_blocks(rs, sb_free_blocks(rs) + 1); + + journal_mark_dirty(th, sbh); + if (for_unformatted) { + int depth = reiserfs_write_unlock_nested(s); + dquot_free_block_nodirty(inode, 1); + reiserfs_write_lock_nested(s, depth); + } +} + +void reiserfs_free_block(struct reiserfs_transaction_handle *th, + struct inode *inode, b_blocknr_t block, + int for_unformatted) +{ + struct super_block *s = th->t_super; + + BUG_ON(!th->t_trans_id); + RFALSE(!s, "vs-4061: trying to free block on nonexistent device"); + if (!is_reusable(s, block, 1)) + return; + + if (block > sb_block_count(REISERFS_SB(s)->s_rs)) { + reiserfs_error(th->t_super, "bitmap-4072", + "Trying to free block outside file system " + "boundaries (%lu > %lu)", + block, sb_block_count(REISERFS_SB(s)->s_rs)); + return; + } + /* mark it before we clear it, just in case */ + journal_mark_freed(th, s, block); + _reiserfs_free_block(th, inode, block, for_unformatted); } /* preallocated blocks don't need to be run through journal_mark_freed */ -static void reiserfs_free_prealloc_block (struct reiserfs_transaction_handle *th, - struct inode *inode, b_blocknr_t block) { - RFALSE(!th->t_super, "vs-4060: trying to free block on nonexistent device"); - RFALSE(is_reusable (th->t_super, block, 1) == 0, "vs-4070: can not free such block"); - BUG_ON (!th->t_trans_id); - _reiserfs_free_block(th, inode, block, 1) ; +static void reiserfs_free_prealloc_block(struct reiserfs_transaction_handle *th, + struct inode *inode, b_blocknr_t block) +{ + BUG_ON(!th->t_trans_id); + RFALSE(!th->t_super, + "vs-4060: trying to free block on nonexistent device"); + if (!is_reusable(th->t_super, block, 1)) + return; + _reiserfs_free_block(th, inode, block, 1); } -static void __discard_prealloc (struct reiserfs_transaction_handle * th, - struct reiserfs_inode_info *ei) +static void __discard_prealloc(struct reiserfs_transaction_handle *th, + struct reiserfs_inode_info *ei) { - unsigned long save = ei->i_prealloc_block ; - int dirty = 0; - struct inode *inode = &ei->vfs_inode; - BUG_ON (!th->t_trans_id); + unsigned long save = ei->i_prealloc_block; + int dirty = 0; + struct inode *inode = &ei->vfs_inode; + + BUG_ON(!th->t_trans_id); #ifdef CONFIG_REISERFS_CHECK - if (ei->i_prealloc_count < 0) - reiserfs_warning (th->t_super, "zam-4001:%s: inode has negative prealloc blocks count.", __FUNCTION__ ); + if (ei->i_prealloc_count < 0) + reiserfs_error(th->t_super, "zam-4001", + "inode has negative prealloc blocks count."); #endif - while (ei->i_prealloc_count > 0) { - reiserfs_free_prealloc_block(th, inode, ei->i_prealloc_block); - ei->i_prealloc_block++; - ei->i_prealloc_count --; - dirty = 1; - } - if (dirty) - reiserfs_update_sd(th, inode); - ei->i_prealloc_block = save; - list_del_init(&(ei->i_prealloc_list)); + while (ei->i_prealloc_count > 0) { + reiserfs_free_prealloc_block(th, inode, ei->i_prealloc_block); + ei->i_prealloc_block++; + ei->i_prealloc_count--; + dirty = 1; + } + if (dirty) + reiserfs_update_sd(th, inode); + ei->i_prealloc_block = save; + list_del_init(&ei->i_prealloc_list); } /* FIXME: It should be inline function */ -void reiserfs_discard_prealloc (struct reiserfs_transaction_handle *th, - struct inode *inode) +void reiserfs_discard_prealloc(struct reiserfs_transaction_handle *th, + struct inode *inode) { - struct reiserfs_inode_info *ei = REISERFS_I(inode); - BUG_ON (!th->t_trans_id); - if (ei->i_prealloc_count) - __discard_prealloc(th, ei); + struct reiserfs_inode_info *ei = REISERFS_I(inode); + + BUG_ON(!th->t_trans_id); + if (ei->i_prealloc_count) + __discard_prealloc(th, ei); } -void reiserfs_discard_all_prealloc (struct reiserfs_transaction_handle *th) +void reiserfs_discard_all_prealloc(struct reiserfs_transaction_handle *th) { - struct list_head * plist = &SB_JOURNAL(th->t_super)->j_prealloc_list; + struct list_head *plist = &SB_JOURNAL(th->t_super)->j_prealloc_list; - BUG_ON (!th->t_trans_id); - - while (!list_empty(plist)) { - struct reiserfs_inode_info *ei; - ei = list_entry(plist->next, struct reiserfs_inode_info, i_prealloc_list); + BUG_ON(!th->t_trans_id); + while (!list_empty(plist)) { + struct reiserfs_inode_info *ei; + ei = list_entry(plist->next, struct reiserfs_inode_info, + i_prealloc_list); #ifdef CONFIG_REISERFS_CHECK - if (!ei->i_prealloc_count) { - reiserfs_warning (th->t_super, "zam-4001:%s: inode is in prealloc list but has no preallocated blocks.", __FUNCTION__); - } + if (!ei->i_prealloc_count) { + reiserfs_error(th->t_super, "zam-4001", + "inode is in prealloc list but has " + "no preallocated blocks."); + } #endif - __discard_prealloc(th, ei); - } + __discard_prealloc(th, ei); + } } -void reiserfs_init_alloc_options (struct super_block *s) +void reiserfs_init_alloc_options(struct super_block *s) { - set_bit (_ALLOC_skip_busy, &SB_ALLOC_OPTS(s)); - set_bit (_ALLOC_dirid_groups, &SB_ALLOC_OPTS(s)); - set_bit (_ALLOC_packing_groups, &SB_ALLOC_OPTS(s)); + set_bit(_ALLOC_skip_busy, &SB_ALLOC_OPTS(s)); + set_bit(_ALLOC_dirid_groups, &SB_ALLOC_OPTS(s)); + set_bit(_ALLOC_packing_groups, &SB_ALLOC_OPTS(s)); } /* block allocator related options are parsed here */ -int reiserfs_parse_alloc_options(struct super_block * s, char * options) +int reiserfs_parse_alloc_options(struct super_block *s, char *options) { - char * this_char, * value; - - REISERFS_SB(s)->s_alloc_options.bits = 0; /* clear default settings */ - - while ( (this_char = strsep (&options, ":")) != 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) { - REISERFS_SB(s)->s_alloc_options.border = 10; - } else { - REISERFS_SB(s)->s_alloc_options.border = 100 / temp; - } - continue; + char *this_char, *value; + + /* clear default settings */ + REISERFS_SB(s)->s_alloc_options.bits = 0; + + while ((this_char = strsep(&options, ":")) != 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) { + REISERFS_SB(s)->s_alloc_options.border = 10; + } else { + REISERFS_SB(s)->s_alloc_options.border = + 100 / temp; + } + continue; + } + if (!strcmp(this_char, "displacing_large_files")) { + SET_OPTION(displacing_large_files); + REISERFS_SB(s)->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, "dirid_groups")) { + SET_OPTION(dirid_groups); + continue; + } + if (!strcmp(this_char, "oid_groups")) { + SET_OPTION(oid_groups); + continue; + } + if (!strcmp(this_char, "packing_groups")) { + SET_OPTION(packing_groups); + 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")) { + REISERFS_SB(s)->s_alloc_options.preallocmin = + (value + && *value) ? simple_strtoul(value, &value, 0) : 4; + continue; + } + + if (!strcmp(this_char, "preallocsize")) { + REISERFS_SB(s)->s_alloc_options.preallocsize = + (value + && *value) ? simple_strtoul(value, &value, + 0) : + PREALLOCATION_SIZE; + continue; + } + + reiserfs_warning(s, "zam-4001", "unknown option - %s", + this_char); + return 1; } - if (!strcmp(this_char, "displacing_large_files")) { - SET_OPTION(displacing_large_files); - REISERFS_SB(s)->s_alloc_options.large_file_size = - (value && *value) ? simple_strtoul (value, &value, 0) : 16; - continue; + + reiserfs_info(s, "allocator options = [%08x]\n", SB_ALLOC_OPTS(s)); + return 0; +} + +static void print_sep(struct seq_file *seq, int *first) +{ + if (!*first) + seq_puts(seq, ":"); + else + *first = 0; +} + +void show_alloc_options(struct seq_file *seq, struct super_block *s) +{ + int first = 1; + + if (SB_ALLOC_OPTS(s) == ((1 << _ALLOC_skip_busy) | + (1 << _ALLOC_dirid_groups) | (1 << _ALLOC_packing_groups))) + return; + + seq_puts(seq, ",alloc="); + + if (TEST_OPTION(concentrating_formatted_nodes, s)) { + print_sep(seq, &first); + if (REISERFS_SB(s)->s_alloc_options.border != 10) { + seq_printf(seq, "concentrating_formatted_nodes=%d", + 100 / REISERFS_SB(s)->s_alloc_options.border); + } else + seq_puts(seq, "concentrating_formatted_nodes"); } - 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 (TEST_OPTION(displacing_large_files, s)) { + print_sep(seq, &first); + if (REISERFS_SB(s)->s_alloc_options.large_file_size != 16) { + seq_printf(seq, "displacing_large_files=%lu", + REISERFS_SB(s)->s_alloc_options.large_file_size); + } else + seq_puts(seq, "displacing_large_files"); } - - if (!strcmp(this_char, "new_hashed_relocation")) { - SET_OPTION(new_hashed_relocation); - continue; + if (TEST_OPTION(displacing_new_packing_localities, s)) { + print_sep(seq, &first); + seq_puts(seq, "displacing_new_packing_localities"); } - - if (!strcmp(this_char, "dirid_groups")) { - SET_OPTION(dirid_groups); - continue; - } - if (!strcmp(this_char, "oid_groups")) { - SET_OPTION(oid_groups); - continue; - } - if (!strcmp(this_char, "packing_groups")) { - SET_OPTION(packing_groups); - continue; - } - if (!strcmp(this_char, "hashed_formatted_nodes")) { - SET_OPTION(hashed_formatted_nodes); - continue; + if (TEST_OPTION(old_hashed_relocation, s)) { + print_sep(seq, &first); + seq_puts(seq, "old_hashed_relocation"); } - - if (!strcmp(this_char, "skip_busy")) { - SET_OPTION(skip_busy); - continue; + if (TEST_OPTION(new_hashed_relocation, s)) { + print_sep(seq, &first); + seq_puts(seq, "new_hashed_relocation"); } - - if (!strcmp(this_char, "hundredth_slices")) { - SET_OPTION(hundredth_slices); - continue; + if (TEST_OPTION(dirid_groups, s)) { + print_sep(seq, &first); + seq_puts(seq, "dirid_groups"); } - - if (!strcmp(this_char, "old_way")) { - SET_OPTION(old_way); - continue; + if (TEST_OPTION(oid_groups, s)) { + print_sep(seq, &first); + seq_puts(seq, "oid_groups"); } - - if (!strcmp(this_char, "displace_based_on_dirid")) { - SET_OPTION(displace_based_on_dirid); - continue; + if (TEST_OPTION(packing_groups, s)) { + print_sep(seq, &first); + seq_puts(seq, "packing_groups"); } - - if (!strcmp(this_char, "preallocmin")) { - REISERFS_SB(s)->s_alloc_options.preallocmin = - (value && *value) ? simple_strtoul (value, &value, 0) : 4; - continue; + if (TEST_OPTION(hashed_formatted_nodes, s)) { + print_sep(seq, &first); + seq_puts(seq, "hashed_formatted_nodes"); } - - if (!strcmp(this_char, "preallocsize")) { - REISERFS_SB(s)->s_alloc_options.preallocsize = - (value && *value) ? simple_strtoul (value, &value, 0) : PREALLOCATION_SIZE; - continue; + if (TEST_OPTION(skip_busy, s)) { + print_sep(seq, &first); + seq_puts(seq, "skip_busy"); + } + if (TEST_OPTION(hundredth_slices, s)) { + print_sep(seq, &first); + seq_puts(seq, "hundredth_slices"); + } + if (TEST_OPTION(old_way, s)) { + print_sep(seq, &first); + seq_puts(seq, "old_way"); + } + if (TEST_OPTION(displace_based_on_dirid, s)) { + print_sep(seq, &first); + seq_puts(seq, "displace_based_on_dirid"); + } + if (REISERFS_SB(s)->s_alloc_options.preallocmin != 0) { + print_sep(seq, &first); + seq_printf(seq, "preallocmin=%d", + REISERFS_SB(s)->s_alloc_options.preallocmin); + } + if (REISERFS_SB(s)->s_alloc_options.preallocsize != 17) { + print_sep(seq, &first); + seq_printf(seq, "preallocsize=%d", + REISERFS_SB(s)->s_alloc_options.preallocsize); } - - reiserfs_warning (s, "zam-4001: %s : unknown option - %s", - __FUNCTION__ , this_char); - return 1; - } - - reiserfs_warning (s, "allocator options = [%08x]\n", SB_ALLOC_OPTS(s)); - return 0; } - -static inline void new_hashed_relocation (reiserfs_blocknr_hint_t * hint) + +static inline void 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); - } + 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); + } - hint->search_start = hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg); + hint->search_start = + hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg); } /* * Relocation based on dirid, hashing them into a given bitmap block - * files. Formatted nodes are unaffected, a seperate policy covers them + * files. Formatted nodes are unaffected, a separate policy covers them */ -static void -dirid_groups (reiserfs_blocknr_hint_t *hint) +static void dirid_groups(reiserfs_blocknr_hint_t * hint) { - unsigned long hash; - __u32 dirid = 0; - int bm = 0; - struct super_block *sb = hint->th->t_super; - if (hint->inode) - dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); - else if (hint->formatted_node) - dirid = hint->key.k_dir_id; - - if (dirid) { - bm = bmap_hash_id(sb, dirid); - hash = bm * (sb->s_blocksize << 3); - /* give a portion of the block group to metadata */ + unsigned long hash; + __u32 dirid = 0; + int bm = 0; + struct super_block *sb = hint->th->t_super; + if (hint->inode) - hash += sb->s_blocksize/2; - hint->search_start = hash; - } + dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); + else if (hint->formatted_node) + dirid = hint->key.k_dir_id; + + if (dirid) { + bm = bmap_hash_id(sb, dirid); + hash = bm * (sb->s_blocksize << 3); + /* give a portion of the block group to metadata */ + if (hint->inode) + hash += sb->s_blocksize / 2; + hint->search_start = hash; + } } /* * Relocation based on oid, hashing them into a given bitmap block - * files. Formatted nodes are unaffected, a seperate policy covers them + * files. Formatted nodes are unaffected, a separate policy covers them */ -static void -oid_groups (reiserfs_blocknr_hint_t *hint) +static void oid_groups(reiserfs_blocknr_hint_t * hint) { - if (hint->inode) { - unsigned long hash; - __u32 oid; - __u32 dirid; - int bm; - - dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); - - /* keep the root dir and it's first set of subdirs close to - * the start of the disk - */ - if (dirid <= 2) - hash = (hint->inode->i_sb->s_blocksize << 3); - else { - oid = le32_to_cpu(INODE_PKEY(hint->inode)->k_objectid); - bm = bmap_hash_id(hint->inode->i_sb, oid); - hash = bm * (hint->inode->i_sb->s_blocksize << 3); + if (hint->inode) { + unsigned long hash; + __u32 oid; + __u32 dirid; + int bm; + + dirid = le32_to_cpu(INODE_PKEY(hint->inode)->k_dir_id); + + /* + * keep the root dir and it's first set of subdirs close to + * the start of the disk + */ + if (dirid <= 2) + hash = (hint->inode->i_sb->s_blocksize << 3); + else { + oid = le32_to_cpu(INODE_PKEY(hint->inode)->k_objectid); + bm = bmap_hash_id(hint->inode->i_sb, oid); + hash = bm * (hint->inode->i_sb->s_blocksize << 3); + } + hint->search_start = hash; } - hint->search_start = hash; - } } -/* returns 1 if it finds an indirect item and gets valid hint info +/* + * returns 1 if it finds an indirect item and gets valid hint info * from it, otherwise 0 */ -static int get_left_neighbor(reiserfs_blocknr_hint_t *hint) +static int get_left_neighbor(reiserfs_blocknr_hint_t * hint) { - struct path * path; - struct buffer_head * bh; - struct item_head * ih; - int pos_in_item; - __le32 * item; - int ret = 0; - - if (!hint->path) /* reiserfs code can call this function w/o pointer to path - * structure supplied; then we rely on supplied search_start */ - return 0; + struct treepath *path; + struct buffer_head *bh; + struct item_head *ih; + int pos_in_item; + __le32 *item; + int ret = 0; + + /* + * reiserfs code can call this function w/o pointer to path + * structure supplied; then we rely on supplied search_start + */ + if (!hint->path) + return 0; - path = hint->path; - bh = get_last_bh(path); - RFALSE( !bh, "green-4002: Illegal path specified to get_left_neighbor"); - 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; - ret = 1; - break; - } - pos_in_item --; + path = hint->path; + bh = get_last_bh(path); + RFALSE(!bh, "green-4002: Illegal path specified to get_left_neighbor"); + ih = tp_item_head(path); + pos_in_item = path->pos_in_item; + item = tp_item_body(path); + + hint->search_start = bh->b_blocknr; + + /* + * for indirect item: go to left and look for the first non-hole entry + * in the indirect item + */ + if (!hint->formatted_node && is_indirect_le_ih(ih)) { + if (pos_in_item == I_UNFM_NUM(ih)) + pos_in_item--; + while (pos_in_item >= 0) { + int t = get_block_num(item, pos_in_item); + if (t) { + hint->search_start = t; + ret = 1; + break; + } + pos_in_item--; + } } - } - /* does result value fit into specified region? */ - return ret; + /* does result value fit into specified region? */ + return ret; } -/* 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 inline void set_border_in_hint(struct super_block *s, reiserfs_blocknr_hint_t *hint) +/* + * 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 inline void set_border_in_hint(struct super_block *s, + reiserfs_blocknr_hint_t * hint) { - b_blocknr_t border = SB_BLOCK_COUNT(s) / REISERFS_SB(s)->s_alloc_options.border; + b_blocknr_t border = + SB_BLOCK_COUNT(s) / REISERFS_SB(s)->s_alloc_options.border; - if (hint->formatted_node) - hint->end = border - 1; - else - hint->beg = border; + if (hint->formatted_node) + hint->end = border - 1; + else + hint->beg = border; } -static inline void displace_large_file(reiserfs_blocknr_hint_t *hint) +static inline void 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); + 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 inline void hash_formatted_node(reiserfs_blocknr_hint_t *hint) +static inline void hash_formatted_node(reiserfs_blocknr_hint_t * hint) { - char * hash_in; + 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); + 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); + hint->search_start = + hint->beg + keyed_hash(hash_in, 4) % (hint->end - hint->beg); } -static inline int this_blocknr_allocation_would_make_it_a_large_file(reiserfs_blocknr_hint_t *hint) +static inline int +this_blocknr_allocation_would_make_it_a_large_file(reiserfs_blocknr_hint_t * + hint) { - return hint->block == REISERFS_SB(hint->th->t_super)->s_alloc_options.large_file_size; + return hint->block == + REISERFS_SB(hint->th->t_super)->s_alloc_options.large_file_size; } #ifdef DISPLACE_NEW_PACKING_LOCALITIES -static inline void displace_new_packing_locality (reiserfs_blocknr_hint_t *hint) +static inline void displace_new_packing_locality(reiserfs_blocknr_hint_t * hint) { - struct in_core_key * key = &hint->key; + struct in_core_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); + hint->th->displace_new_blocks = 0; + hint->search_start = + hint->beg + keyed_hash((char *)(&key->k_objectid), + 4) % (hint->end - hint->beg); } - #endif +#endif -static inline int old_hashed_relocation (reiserfs_blocknr_hint_t * hint) +static inline int old_hashed_relocation(reiserfs_blocknr_hint_t * hint) { - b_blocknr_t border; - u32 hash_in; - - if (hint->formatted_node || hint->inode == NULL) { - return 0; - } + b_blocknr_t border; + u32 hash_in; + + if (hint->formatted_node || hint->inode == NULL) { + return 0; + } + + hash_in = le32_to_cpu((INODE_PKEY(hint->inode))->k_dir_id); + border = + hint->beg + (u32) keyed_hash(((char *)(&hash_in)), + 4) % (hint->end - hint->beg - 1); + if (border > hint->search_start) + hint->search_start = border; - hash_in = le32_to_cpu((INODE_PKEY(hint->inode))->k_dir_id); - border = hint->beg + (u32) keyed_hash(((char *) (&hash_in)), 4) % (hint->end - hint->beg - 1); - if (border > hint->search_start) - hint->search_start = border; + return 1; +} - return 1; - } - -static inline int old_way (reiserfs_blocknr_hint_t * hint) +static inline int old_way(reiserfs_blocknr_hint_t * hint) { - b_blocknr_t border; - - if (hint->formatted_node || hint->inode == NULL) { - return 0; - } - - 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; + b_blocknr_t border; + + if (hint->formatted_node || hint->inode == NULL) { + return 0; + } + + 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; + return 1; } -static inline void hundredth_slices (reiserfs_blocknr_hint_t * hint) +static inline void hundredth_slices(reiserfs_blocknr_hint_t * hint) { - struct in_core_key * key = &hint->key; - b_blocknr_t 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; - } + struct in_core_key *key = &hint->key; + b_blocknr_t 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 determine_search_start(reiserfs_blocknr_hint_t *hint, - int amount_needed) + +static void determine_search_start(reiserfs_blocknr_hint_t * hint, + int amount_needed) { - struct super_block *s = hint->th->t_super; - int unfm_hint; + struct super_block *s = hint->th->t_super; + int unfm_hint; - hint->beg = 0; - hint->end = SB_BLOCK_COUNT(s) - 1; + 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); + /* 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; - } + /* + * 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 - - /* 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; - } + /* + * all persons should feel encouraged to add more special cases + * here and test them + */ - /* 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; - } + if (displacing_large_files(s) && !hint->formatted_node + && this_blocknr_allocation_would_make_it_a_large_file(hint)) { + displace_large_file(hint); + return; + } - unfm_hint = get_left_neighbor(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; + } - /* 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); + unfm_hint = get_left_neighbor(hint); - if ( hint->inode && hint->search_start < REISERFS_I(hint->inode)->i_prealloc_block) - hint->search_start = REISERFS_I(hint->inode)->i_prealloc_block; + /* + * 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 < + REISERFS_I(hint->inode)->i_prealloc_block) + hint->search_start = + REISERFS_I(hint->inode)->i_prealloc_block; + } + return; } - 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; - } - - /* old_hashed_relocation only works on unformatted */ - if (!unfm_hint && !hint->formatted_node && - TEST_OPTION(old_hashed_relocation, s)) - { - old_hashed_relocation(hint); - } - /* new_hashed_relocation works with both formatted/unformatted nodes */ - if ((!unfm_hint || hint->formatted_node) && - TEST_OPTION(new_hashed_relocation, s)) - { - new_hashed_relocation(hint); - } - /* dirid grouping works only on unformatted nodes */ - if (!unfm_hint && !hint->formatted_node && TEST_OPTION(dirid_groups,s)) - { - dirid_groups(hint); - } + /* This is an approach proposed by Hans */ + if (TEST_OPTION(hundredth_slices, s) + && !(displacing_large_files(s) && !hint->formatted_node)) { + hundredth_slices(hint); + return; + } + /* old_hashed_relocation only works on unformatted */ + if (!unfm_hint && !hint->formatted_node && + TEST_OPTION(old_hashed_relocation, s)) { + old_hashed_relocation(hint); + } + + /* new_hashed_relocation works with both formatted/unformatted nodes */ + if ((!unfm_hint || hint->formatted_node) && + TEST_OPTION(new_hashed_relocation, s)) { + new_hashed_relocation(hint); + } + + /* dirid grouping works only on unformatted nodes */ + if (!unfm_hint && !hint->formatted_node && TEST_OPTION(dirid_groups, s)) { + dirid_groups(hint); + } #ifdef DISPLACE_NEW_PACKING_LOCALITIES - if (hint->formatted_node && TEST_OPTION(dirid_groups,s)) - { - dirid_groups(hint); - } + if (hint->formatted_node && TEST_OPTION(dirid_groups, s)) { + dirid_groups(hint); + } #endif - /* oid grouping works only on unformatted nodes */ - if (!unfm_hint && !hint->formatted_node && TEST_OPTION(oid_groups,s)) - { - oid_groups(hint); - } - return; + /* oid grouping works only on unformatted nodes */ + if (!unfm_hint && !hint->formatted_node && TEST_OPTION(oid_groups, s)) { + oid_groups(hint); + } + return; } static int determine_prealloc_size(reiserfs_blocknr_hint_t * hint) { - /* 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 >= REISERFS_SB(hint->th->t_super)->s_alloc_options.preallocmin * hint->inode->i_sb->s_blocksize) - hint->prealloc_size = REISERFS_SB(hint->th->t_super)->s_alloc_options.preallocsize - 1; - } - return CARRY_ON; + /* 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 >= + REISERFS_SB(hint->th->t_super)->s_alloc_options. + preallocmin * hint->inode->i_sb->s_blocksize) + hint->prealloc_size = + REISERFS_SB(hint->th->t_super)->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 min, - int amount_needed, int prealloc_size) +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 min, + int amount_needed, + int prealloc_size) { - int rest = amount_needed; - int nr_allocated; - - while (rest > 0 && start <= finish) { - nr_allocated = scan_bitmap (hint->th, &start, finish, min, - 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 --; - } + int rest = amount_needed; + int nr_allocated; + + while (rest > 0 && start <= finish) { + nr_allocated = scan_bitmap(hint->th, &start, finish, min, + 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(&REISERFS_I(hint->inode)->i_prealloc_list, - &SB_JOURNAL(hint->th->t_super)->j_prealloc_list); - REISERFS_I(hint->inode)->i_prealloc_block = start; - REISERFS_I(hint->inode)->i_prealloc_count = nr_allocated; - break; + /* 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(&REISERFS_I(hint->inode)->i_prealloc_list, + &SB_JOURNAL(hint->th->t_super)-> + j_prealloc_list); + REISERFS_I(hint->inode)->i_prealloc_block = start; + REISERFS_I(hint->inode)->i_prealloc_count = + nr_allocated; + break; + } } - } - return (amount_needed - rest); + 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 super_block *s = hint->th->t_super; - b_blocknr_t start = hint->search_start; - b_blocknr_t finish = SB_BLOCK_COUNT(s) - 1; - int passno = 0; - int nr_allocated = 0; - int bigalloc = 0; - - determine_prealloc_size(hint); - if (!hint->formatted_node) { - int quota_ret; + (reiserfs_blocknr_hint_t * hint, b_blocknr_t * new_blocknrs, + int amount_needed) { + 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 passno = 0; + int nr_allocated = 0; + int depth; + + determine_prealloc_size(hint); + if (!hint->formatted_node) { + int quota_ret; #ifdef REISERQUOTA_DEBUG - reiserfs_debug (s, REISERFS_DEBUG_CODE, "reiserquota: allocating %d blocks id=%u", amount_needed, hint->inode->i_uid); + reiserfs_debug(s, REISERFS_DEBUG_CODE, + "reiserquota: allocating %d blocks id=%u", + amount_needed, hint->inode->i_uid); #endif - quota_ret = DQUOT_ALLOC_BLOCK_NODIRTY(hint->inode, amount_needed); - if (quota_ret) /* Quota exceeded? */ - return QUOTA_EXCEEDED; - if (hint->preallocate && hint->prealloc_size ) { + depth = reiserfs_write_unlock_nested(s); + quota_ret = + dquot_alloc_block_nodirty(hint->inode, amount_needed); + if (quota_ret) { /* Quota exceeded? */ + reiserfs_write_lock_nested(s, depth); + return QUOTA_EXCEEDED; + } + if (hint->preallocate && hint->prealloc_size) { #ifdef REISERQUOTA_DEBUG - reiserfs_debug (s, REISERFS_DEBUG_CODE, "reiserquota: allocating (prealloc) %d blocks id=%u", hint->prealloc_size, hint->inode->i_uid); + reiserfs_debug(s, REISERFS_DEBUG_CODE, + "reiserquota: allocating (prealloc) %d blocks id=%u", + hint->prealloc_size, hint->inode->i_uid); #endif - quota_ret = DQUOT_PREALLOC_BLOCK_NODIRTY(hint->inode, hint->prealloc_size); - if (quota_ret) - hint->preallocate=hint->prealloc_size=0; + quota_ret = dquot_prealloc_block_nodirty(hint->inode, + hint->prealloc_size); + if (quota_ret) + hint->preallocate = hint->prealloc_size = 0; + } + /* for unformatted nodes, force large allocations */ + reiserfs_write_lock_nested(s, depth); } - /* for unformatted nodes, force large allocations */ - bigalloc = amount_needed; - } - do { - /* in bigalloc mode, nr_allocated should stay zero until - * the entire allocation is filled - */ - if (unlikely(bigalloc && nr_allocated)) { - reiserfs_warning(s, "bigalloc is %d, nr_allocated %d\n", - bigalloc, nr_allocated); - /* reset things to a sane value */ - bigalloc = amount_needed - nr_allocated; - } - /* - * try pass 0 and pass 1 looking for a nice big - * contiguous allocation. Then reset and look - * for anything you can find. - */ - if (passno == 2 && bigalloc) { - passno = 0; - bigalloc = 0; - } - switch (passno++) { - case 0: /* Search from hint->search_start to end of disk */ - start = hint->search_start; - finish = SB_BLOCK_COUNT(s) - 1; - break; - case 1: /* Search from hint->beg to hint->search_start */ - start = hint->beg; - finish = hint->search_start; - break; - case 2: /* Last chance: Search from 0 to hint->beg */ - start = 0; - finish = hint->beg; - break; - default: /* We've tried searching everywhere, not enough space */ - /* Free the blocks */ - if (!hint->formatted_node) { + do { + switch (passno++) { + case 0: /* Search from hint->search_start to end of disk */ + start = hint->search_start; + finish = SB_BLOCK_COUNT(s) - 1; + break; + case 1: /* Search from hint->beg to hint->search_start */ + start = hint->beg; + finish = hint->search_start; + break; + case 2: /* Last chance: Search from 0 to hint->beg */ + start = 0; + finish = hint->beg; + break; + default: + /* We've tried searching everywhere, not enough space */ + /* Free the blocks */ + if (!hint->formatted_node) { #ifdef REISERQUOTA_DEBUG - reiserfs_debug (s, REISERFS_DEBUG_CODE, "reiserquota: freeing (nospace) %d blocks id=%u", amount_needed + hint->prealloc_size - nr_allocated, hint->inode->i_uid); + reiserfs_debug(s, REISERFS_DEBUG_CODE, + "reiserquota: freeing (nospace) %d blocks id=%u", + amount_needed + + hint->prealloc_size - + nr_allocated, + hint->inode->i_uid); #endif - DQUOT_FREE_BLOCK_NODIRTY(hint->inode, amount_needed + hint->prealloc_size - nr_allocated); /* Free not allocated blocks */ - } - while (nr_allocated --) - reiserfs_free_block(hint->th, hint->inode, new_blocknrs[nr_allocated], !hint->formatted_node); - - return NO_DISK_SPACE; - } - } while ((nr_allocated += allocate_without_wrapping_disk (hint, - new_blocknrs + nr_allocated, start, finish, - bigalloc ? bigalloc : 1, - amount_needed - nr_allocated, - hint->prealloc_size)) - < amount_needed); - if ( !hint->formatted_node && - amount_needed + hint->prealloc_size > - nr_allocated + REISERFS_I(hint->inode)->i_prealloc_count) { - /* Some of preallocation blocks were not allocated */ + /* Free not allocated blocks */ + depth = reiserfs_write_unlock_nested(s); + dquot_free_block_nodirty(hint->inode, + amount_needed + hint->prealloc_size - + nr_allocated); + reiserfs_write_lock_nested(s, depth); + } + while (nr_allocated--) + reiserfs_free_block(hint->th, hint->inode, + new_blocknrs[nr_allocated], + !hint->formatted_node); + + return NO_DISK_SPACE; + } + } while ((nr_allocated += allocate_without_wrapping_disk(hint, + new_blocknrs + + nr_allocated, + start, finish, + 1, + amount_needed - + nr_allocated, + hint-> + prealloc_size)) + < amount_needed); + if (!hint->formatted_node && + amount_needed + hint->prealloc_size > + nr_allocated + REISERFS_I(hint->inode)->i_prealloc_count) { + /* Some of preallocation blocks were not allocated */ #ifdef REISERQUOTA_DEBUG - reiserfs_debug (s, REISERFS_DEBUG_CODE, "reiserquota: freeing (failed prealloc) %d blocks id=%u", amount_needed + hint->prealloc_size - nr_allocated - REISERFS_I(hint->inode)->i_prealloc_count, hint->inode->i_uid); + reiserfs_debug(s, REISERFS_DEBUG_CODE, + "reiserquota: freeing (failed prealloc) %d blocks id=%u", + amount_needed + hint->prealloc_size - + nr_allocated - + REISERFS_I(hint->inode)->i_prealloc_count, + hint->inode->i_uid); #endif - DQUOT_FREE_BLOCK_NODIRTY(hint->inode, amount_needed + - hint->prealloc_size - nr_allocated - - REISERFS_I(hint->inode)->i_prealloc_count); - } - return CARRY_ON; + depth = reiserfs_write_unlock_nested(s); + dquot_free_block_nodirty(hint->inode, amount_needed + + hint->prealloc_size - nr_allocated - + REISERFS_I(hint->inode)-> + i_prealloc_count); + reiserfs_write_lock_nested(s, depth); + } + + 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) +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; + struct inode *inode = hint->inode; - if (REISERFS_I(inode)->i_prealloc_count > 0) { - while (amount_needed) { + if (REISERFS_I(inode)->i_prealloc_count > 0) { + while (amount_needed) { - *new_blocknrs ++ = REISERFS_I(inode)->i_prealloc_block ++; - REISERFS_I(inode)->i_prealloc_count --; + *new_blocknrs++ = REISERFS_I(inode)->i_prealloc_block++; + REISERFS_I(inode)->i_prealloc_count--; - amount_needed --; + amount_needed--; - if (REISERFS_I(inode)->i_prealloc_count <= 0) { - list_del(&REISERFS_I(inode)->i_prealloc_list); - break; - } + if (REISERFS_I(inode)->i_prealloc_count <= 0) { + list_del(&REISERFS_I(inode)->i_prealloc_list); + break; + } + } } - } - /* return amount still needed after using preallocated blocks */ - return amount_needed; + /* 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 */) + b_blocknr_t *new_blocknrs, + int amount_needed, + /* Amount of blocks we have already reserved */ + int reserved_by_us) { - int initial_amount_needed = amount_needed; - int ret; - struct super_block *s = hint->th->t_super; - - /* Check if there is enough space, taking into account reserved space */ - if ( SB_FREE_BLOCKS(s) - REISERFS_SB(s)->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 + int initial_amount_needed = amount_needed; + int ret; + struct super_block *s = hint->th->t_super; + + /* Check if there is enough space, taking into account reserved space */ + if (SB_FREE_BLOCKS(s) - REISERFS_SB(s)->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 associated with + * metadata allocations - green + */ + + if (!hint->formatted_node && hint->preallocate) { + amount_needed = use_preallocated_list_if_available + (hint, new_blocknrs, amount_needed); + + /* + * We have all the block numbers we need from the + * prealloc list + */ + if (amount_needed == 0) + 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); + if (hint->search_start >= SB_BLOCK_COUNT(s)) + hint->search_start = SB_BLOCK_COUNT(s) - 1; + + /* allocation itself; fill new_blocknrs and preallocation arrays */ + ret = blocknrs_and_prealloc_arrays_from_search_start (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); - if (hint->search_start >= SB_BLOCK_COUNT(s)) - hint->search_start = SB_BLOCK_COUNT(s) - 1; - - /* 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, hint->inode, *(--new_blocknrs), 1); + + /* + * 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, hint->inode, + *(--new_blocknrs), 1); + } } - } - return ret; + 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 */ - ) +void reiserfs_cache_bitmap_metadata(struct super_block *sb, + struct buffer_head *bh, + struct reiserfs_bitmap_info *info) { + unsigned long *cur = (unsigned long *)(bh->b_data + bh->b_size); - /* Fast case, if reservation is zero - exit immediately. */ - if ( !blocks ) - return; + /* The first bit must ALWAYS be 1 */ + if (!reiserfs_test_le_bit(0, (unsigned long *)bh->b_data)) + reiserfs_error(sb, "reiserfs-2025", "bitmap block %lu is " + "corrupted: first bit must be 1", bh->b_blocknr); + + info->free_count = 0; - spin_lock(&REISERFS_SB(sb)->bitmap_lock); - REISERFS_SB(sb)->reserved_blocks += blocks; - spin_unlock(&REISERFS_SB(sb)->bitmap_lock); + while (--cur >= (unsigned long *)bh->b_data) { + /* 0 and ~0 are special, we can optimize for them */ + if (*cur == 0) + info->free_count += BITS_PER_LONG; + else if (*cur != ~0L) /* A mix, investigate */ + info->free_count += BITS_PER_LONG - hweight_long(*cur); + } } -/* 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 */ - ) +struct buffer_head *reiserfs_read_bitmap_block(struct super_block *sb, + unsigned int bitmap) { + b_blocknr_t block = (sb->s_blocksize << 3) * bitmap; + struct reiserfs_bitmap_info *info = SB_AP_BITMAP(sb) + bitmap; + struct buffer_head *bh; - /* Fast case, if unreservation is zero - exit immediately. */ - if ( !blocks ) - return; + /* + * Way old format filesystems had the bitmaps packed up front. + * I doubt there are any of these left, but just in case... + */ + if (unlikely(test_bit(REISERFS_OLD_FORMAT, + &REISERFS_SB(sb)->s_properties))) + block = REISERFS_SB(sb)->s_sbh->b_blocknr + 1 + bitmap; + else if (bitmap == 0) + block = (REISERFS_DISK_OFFSET_IN_BYTES >> sb->s_blocksize_bits) + 1; + + bh = sb_bread(sb, block); + if (bh == NULL) + reiserfs_warning(sb, "sh-2029: %s: bitmap block (#%u) " + "reading failed", __func__, block); + else { + if (buffer_locked(bh)) { + int depth; + PROC_INFO_INC(sb, scan_bitmap.wait); + depth = reiserfs_write_unlock_nested(sb); + __wait_on_buffer(bh); + reiserfs_write_lock_nested(sb, depth); + } + BUG_ON(!buffer_uptodate(bh)); + BUG_ON(atomic_read(&bh->b_count) == 0); + + if (info->free_count == UINT_MAX) + reiserfs_cache_bitmap_metadata(sb, bh, info); + } - spin_lock(&REISERFS_SB(sb)->bitmap_lock); - REISERFS_SB(sb)->reserved_blocks -= blocks; - spin_unlock(&REISERFS_SB(sb)->bitmap_lock); - RFALSE( REISERFS_SB(sb)->reserved_blocks < 0, "amount of blocks reserved became zero?"); + return bh; } -/* This function estimates how much pages we will be able to write to FS - used for reiserfs_file_write() purposes for now. */ -int reiserfs_can_fit_pages ( struct super_block *sb /* superblock of filesystem - to estimate space */ ) +int reiserfs_init_bitmap_cache(struct super_block *sb) { - int space; + struct reiserfs_bitmap_info *bitmap; + unsigned int bmap_nr = reiserfs_bmap_count(sb); - spin_lock(&REISERFS_SB(sb)->bitmap_lock); - space = (SB_FREE_BLOCKS(sb) - REISERFS_SB(sb)->reserved_blocks) >> ( PAGE_CACHE_SHIFT - sb->s_blocksize_bits); - spin_unlock(&REISERFS_SB(sb)->bitmap_lock); + bitmap = vmalloc(sizeof(*bitmap) * bmap_nr); + if (bitmap == NULL) + return -ENOMEM; - return space>0?space:0; + memset(bitmap, 0xff, sizeof(*bitmap) * bmap_nr); + + SB_AP_BITMAP(sb) = bitmap; + + return 0; +} + +void reiserfs_free_bitmap_cache(struct super_block *sb) +{ + if (SB_AP_BITMAP(sb)) { + vfree(SB_AP_BITMAP(sb)); + SB_AP_BITMAP(sb) = NULL; + } } |