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![Jeff Mahoney](/assets/img/avatar_default.png)
This patch moves the bitmap loading code from super.c to bitmap.c The code is also restructured somewhat. The only difference between new format bitmaps and old format bitmaps is where they are. That's a two liner before loading the block to use the correct one. There's no need for an entirely separate code path. The load path is generally the same, with the pattern being to throw out a bunch of requests and then wait for them, then cache the metadata from the contents. Again, like the previous patches, the purpose is to set up for later ones. Update: There was a bug in the previously posted version of this that resulted in corruption. The problem was that bitmap 0 on new format file systems must be treated specially, and wasn't. A stupid bug with an easy fix. This is hopefully the last fix for the disaster that is the reiserfs bitmap patch set. If a bitmap block was full, first_zero_hint would end up at zero since it would never be changed from it's zeroed out value. This just sets it beyond the end of the bitmap block. If any bits are freed, it will be reset to a valid bit. When info->free_count = 0, then we already know it's full. Signed-off-by: Jeff Mahoney <jeffm@suse.com> Cc: <reiserfs-dev@namesys.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
202 lines
6 KiB
C
202 lines
6 KiB
C
/*
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* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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*/
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/*
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* Written by Alexander Zarochentcev.
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*
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* The kernel part of the (on-line) reiserfs resizer.
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*/
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#include <linux/kernel.h>
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#include <linux/mm.h>
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#include <linux/vmalloc.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/reiserfs_fs.h>
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#include <linux/reiserfs_fs_sb.h>
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#include <linux/buffer_head.h>
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int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
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{
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int err = 0;
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struct reiserfs_super_block *sb;
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struct reiserfs_bitmap_info *bitmap;
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struct reiserfs_bitmap_info *info;
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struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
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struct buffer_head *bh;
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struct reiserfs_transaction_handle th;
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unsigned int bmap_nr_new, bmap_nr;
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unsigned int block_r_new, block_r;
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struct reiserfs_list_bitmap *jb;
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struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS];
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unsigned long int block_count, free_blocks;
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int i;
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int copy_size;
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sb = SB_DISK_SUPER_BLOCK(s);
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if (SB_BLOCK_COUNT(s) >= block_count_new) {
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printk("can\'t shrink filesystem on-line\n");
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return -EINVAL;
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}
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/* check the device size */
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bh = sb_bread(s, block_count_new - 1);
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if (!bh) {
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printk("reiserfs_resize: can\'t read last block\n");
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return -EINVAL;
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}
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bforget(bh);
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/* old disk layout detection; those partitions can be mounted, but
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* cannot be resized */
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if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size
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!= REISERFS_DISK_OFFSET_IN_BYTES) {
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printk
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("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n");
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return -ENOTSUPP;
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}
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/* count used bits in last bitmap block */
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block_r = SB_BLOCK_COUNT(s) - (SB_BMAP_NR(s) - 1) * s->s_blocksize * 8;
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/* count bitmap blocks in new fs */
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bmap_nr_new = block_count_new / (s->s_blocksize * 8);
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block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8;
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if (block_r_new)
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bmap_nr_new++;
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else
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block_r_new = s->s_blocksize * 8;
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/* save old values */
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block_count = SB_BLOCK_COUNT(s);
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bmap_nr = SB_BMAP_NR(s);
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/* resizing of reiserfs bitmaps (journal and real), if needed */
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if (bmap_nr_new > bmap_nr) {
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/* reallocate journal bitmaps */
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if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) {
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printk
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("reiserfs_resize: unable to allocate memory for journal bitmaps\n");
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unlock_super(s);
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return -ENOMEM;
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}
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/* the new journal bitmaps are zero filled, now we copy in the bitmap
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** node pointers from the old journal bitmap structs, and then
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** transfer the new data structures into the journal struct.
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**
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** using the copy_size var below allows this code to work for
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** both shrinking and expanding the FS.
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*/
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copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr;
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copy_size =
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copy_size * sizeof(struct reiserfs_list_bitmap_node *);
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for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
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struct reiserfs_bitmap_node **node_tmp;
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jb = SB_JOURNAL(s)->j_list_bitmap + i;
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memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size);
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/* just in case vfree schedules on us, copy the new
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** pointer into the journal struct before freeing the
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** old one
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*/
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node_tmp = jb->bitmaps;
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jb->bitmaps = jbitmap[i].bitmaps;
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vfree(node_tmp);
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}
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/* allocate additional bitmap blocks, reallocate array of bitmap
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* block pointers */
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bitmap =
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vmalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
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if (!bitmap) {
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/* Journal bitmaps are still supersized, but the memory isn't
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* leaked, so I guess it's ok */
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printk("reiserfs_resize: unable to allocate memory.\n");
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return -ENOMEM;
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}
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memset(bitmap, 0,
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sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
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for (i = 0; i < bmap_nr; i++)
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bitmap[i] = old_bitmap[i];
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/* This doesn't go through the journal, but it doesn't have to.
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* The changes are still atomic: We're synced up when the journal
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* transaction begins, and the new bitmaps don't matter if the
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* transaction fails. */
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for (i = bmap_nr; i < bmap_nr_new; i++) {
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bh = sb_getblk(s, i * s->s_blocksize * 8);
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get_bh(bh);
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memset(bh->b_data, 0, sb_blocksize(sb));
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reiserfs_test_and_set_le_bit(0, bh->b_data);
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reiserfs_cache_bitmap_metadata(s, bh, bitmap + i);
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set_buffer_uptodate(bh);
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mark_buffer_dirty(bh);
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sync_dirty_buffer(bh);
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// update bitmap_info stuff
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bitmap[i].first_zero_hint = 1;
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bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
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bitmap[i].bh = bh;
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brelse(bh);
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}
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/* free old bitmap blocks array */
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SB_AP_BITMAP(s) = bitmap;
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vfree(old_bitmap);
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}
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/* begin transaction, if there was an error, it's fine. Yes, we have
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* incorrect bitmaps now, but none of it is ever going to touch the
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* disk anyway. */
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err = journal_begin(&th, s, 10);
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if (err)
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return err;
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/* Extend old last bitmap block - new blocks have been made available */
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info = SB_AP_BITMAP(s) + bmap_nr - 1;
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bh = info->bh;
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get_bh(bh);
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reiserfs_prepare_for_journal(s, bh, 1);
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for (i = block_r; i < s->s_blocksize * 8; i++)
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reiserfs_test_and_clear_le_bit(i, bh->b_data);
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info->free_count += s->s_blocksize * 8 - block_r;
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if (!info->first_zero_hint)
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info->first_zero_hint = block_r;
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journal_mark_dirty(&th, s, bh);
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brelse(bh);
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/* Correct new last bitmap block - It may not be full */
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info = SB_AP_BITMAP(s) + bmap_nr_new - 1;
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bh = info->bh;
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get_bh(bh);
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reiserfs_prepare_for_journal(s, bh, 1);
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for (i = block_r_new; i < s->s_blocksize * 8; i++)
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reiserfs_test_and_set_le_bit(i, bh->b_data);
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journal_mark_dirty(&th, s, bh);
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brelse(bh);
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info->free_count -= s->s_blocksize * 8 - block_r_new;
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/* Extreme case where last bitmap is the only valid block in itself. */
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if (!info->free_count)
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info->first_zero_hint = 0;
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/* update super */
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reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
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free_blocks = SB_FREE_BLOCKS(s);
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PUT_SB_FREE_BLOCKS(s,
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free_blocks + (block_count_new - block_count -
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(bmap_nr_new - bmap_nr)));
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PUT_SB_BLOCK_COUNT(s, block_count_new);
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PUT_SB_BMAP_NR(s, bmap_nr_new);
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s->s_dirt = 1;
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journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
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SB_JOURNAL(s)->j_must_wait = 1;
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return journal_end(&th, s, 10);
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}
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