/*
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
*/
-
+
/*
* Written by Alexander Zarochentcev.
*
#include <linux/reiserfs_fs_sb.h>
#include <linux/buffer_head.h>
-int reiserfs_resize (struct super_block * s, unsigned long block_count_new)
+int reiserfs_resize(struct super_block *s, unsigned long block_count_new)
{
- int err = 0;
- struct reiserfs_super_block * sb;
- struct reiserfs_bitmap_info *bitmap;
+ int err = 0;
+ struct reiserfs_super_block *sb;
+ struct reiserfs_bitmap_info *bitmap;
struct reiserfs_bitmap_info *old_bitmap = SB_AP_BITMAP(s);
- struct buffer_head * bh;
+ struct buffer_head *bh;
struct reiserfs_transaction_handle th;
unsigned int bmap_nr_new, bmap_nr;
unsigned int block_r_new, block_r;
-
- struct reiserfs_list_bitmap * jb;
+
+ struct reiserfs_list_bitmap *jb;
struct reiserfs_list_bitmap jbitmap[JOURNAL_NUM_BITMAPS];
-
+
unsigned long int block_count, free_blocks;
int i;
- int copy_size ;
+ int copy_size;
sb = SB_DISK_SUPER_BLOCK(s);
if (!bh) {
printk("reiserfs_resize: can\'t read last block\n");
return -EINVAL;
- }
+ }
bforget(bh);
/* old disk layout detection; those partitions can be mounted, but
* cannot be resized */
- if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size
- != REISERFS_DISK_OFFSET_IN_BYTES ) {
- printk("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n");
+ if (SB_BUFFER_WITH_SB(s)->b_blocknr * SB_BUFFER_WITH_SB(s)->b_size
+ != REISERFS_DISK_OFFSET_IN_BYTES) {
+ printk
+ ("reiserfs_resize: unable to resize a reiserfs without distributed bitmap (fs version < 3.5.12)\n");
return -ENOTSUPP;
}
-
+
/* count used bits in last bitmap block */
- block_r = SB_BLOCK_COUNT(s) -
- (SB_BMAP_NR(s) - 1) * s->s_blocksize * 8;
-
+ block_r = SB_BLOCK_COUNT(s) - (SB_BMAP_NR(s) - 1) * s->s_blocksize * 8;
+
/* count bitmap blocks in new fs */
- bmap_nr_new = block_count_new / ( s->s_blocksize * 8 );
+ bmap_nr_new = block_count_new / (s->s_blocksize * 8);
block_r_new = block_count_new - bmap_nr_new * s->s_blocksize * 8;
- if (block_r_new)
+ if (block_r_new)
bmap_nr_new++;
else
block_r_new = s->s_blocksize * 8;
/* save old values */
block_count = SB_BLOCK_COUNT(s);
- bmap_nr = SB_BMAP_NR(s);
+ bmap_nr = SB_BMAP_NR(s);
/* resizing of reiserfs bitmaps (journal and real), if needed */
- if (bmap_nr_new > bmap_nr) {
- /* reallocate journal bitmaps */
- if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) {
- printk("reiserfs_resize: unable to allocate memory for journal bitmaps\n");
- unlock_super(s) ;
- return -ENOMEM ;
- }
- /* the new journal bitmaps are zero filled, now we copy in the bitmap
- ** node pointers from the old journal bitmap structs, and then
- ** transfer the new data structures into the journal struct.
- **
- ** using the copy_size var below allows this code to work for
- ** both shrinking and expanding the FS.
- */
- copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr ;
- copy_size = copy_size * sizeof(struct reiserfs_list_bitmap_node *) ;
- for (i = 0 ; i < JOURNAL_NUM_BITMAPS ; i++) {
- struct reiserfs_bitmap_node **node_tmp ;
- jb = SB_JOURNAL(s)->j_list_bitmap + i ;
- memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size) ;
-
- /* just in case vfree schedules on us, copy the new
- ** pointer into the journal struct before freeing the
- ** old one
- */
- node_tmp = jb->bitmaps ;
- jb->bitmaps = jbitmap[i].bitmaps ;
- vfree(node_tmp) ;
- }
-
- /* allocate additional bitmap blocks, reallocate array of bitmap
- * block pointers */
- bitmap = vmalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
- if (!bitmap) {
- /* Journal bitmaps are still supersized, but the memory isn't
- * leaked, so I guess it's ok */
- printk("reiserfs_resize: unable to allocate memory.\n");
- return -ENOMEM;
- }
- memset (bitmap, 0, sizeof (struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
- for (i = 0; i < bmap_nr; i++)
- bitmap[i] = old_bitmap[i];
-
- /* This doesn't go through the journal, but it doesn't have to.
- * The changes are still atomic: We're synced up when the journal
- * transaction begins, and the new bitmaps don't matter if the
- * transaction fails. */
- for (i = bmap_nr; i < bmap_nr_new; i++) {
- bitmap[i].bh = sb_getblk(s, i * s->s_blocksize * 8);
- memset(bitmap[i].bh->b_data, 0, sb_blocksize(sb));
- reiserfs_test_and_set_le_bit(0, bitmap[i].bh->b_data);
-
- set_buffer_uptodate(bitmap[i].bh);
- mark_buffer_dirty(bitmap[i].bh) ;
- sync_dirty_buffer(bitmap[i].bh);
- // update bitmap_info stuff
- bitmap[i].first_zero_hint=1;
- bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
- }
- /* free old bitmap blocks array */
- SB_AP_BITMAP(s) = bitmap;
- vfree (old_bitmap);
+ if (bmap_nr_new > bmap_nr) {
+ /* reallocate journal bitmaps */
+ if (reiserfs_allocate_list_bitmaps(s, jbitmap, bmap_nr_new) < 0) {
+ printk
+ ("reiserfs_resize: unable to allocate memory for journal bitmaps\n");
+ unlock_super(s);
+ return -ENOMEM;
+ }
+ /* the new journal bitmaps are zero filled, now we copy in the bitmap
+ ** node pointers from the old journal bitmap structs, and then
+ ** transfer the new data structures into the journal struct.
+ **
+ ** using the copy_size var below allows this code to work for
+ ** both shrinking and expanding the FS.
+ */
+ copy_size = bmap_nr_new < bmap_nr ? bmap_nr_new : bmap_nr;
+ copy_size =
+ copy_size * sizeof(struct reiserfs_list_bitmap_node *);
+ for (i = 0; i < JOURNAL_NUM_BITMAPS; i++) {
+ struct reiserfs_bitmap_node **node_tmp;
+ jb = SB_JOURNAL(s)->j_list_bitmap + i;
+ memcpy(jbitmap[i].bitmaps, jb->bitmaps, copy_size);
+
+ /* just in case vfree schedules on us, copy the new
+ ** pointer into the journal struct before freeing the
+ ** old one
+ */
+ node_tmp = jb->bitmaps;
+ jb->bitmaps = jbitmap[i].bitmaps;
+ vfree(node_tmp);
+ }
+
+ /* allocate additional bitmap blocks, reallocate array of bitmap
+ * block pointers */
+ bitmap =
+ vmalloc(sizeof(struct reiserfs_bitmap_info) * bmap_nr_new);
+ if (!bitmap) {
+ /* Journal bitmaps are still supersized, but the memory isn't
+ * leaked, so I guess it's ok */
+ printk("reiserfs_resize: unable to allocate memory.\n");
+ return -ENOMEM;
+ }
+ memset(bitmap, 0,
+ sizeof(struct reiserfs_bitmap_info) * SB_BMAP_NR(s));
+ for (i = 0; i < bmap_nr; i++)
+ bitmap[i] = old_bitmap[i];
+
+ /* This doesn't go through the journal, but it doesn't have to.
+ * The changes are still atomic: We're synced up when the journal
+ * transaction begins, and the new bitmaps don't matter if the
+ * transaction fails. */
+ for (i = bmap_nr; i < bmap_nr_new; i++) {
+ bitmap[i].bh = sb_getblk(s, i * s->s_blocksize * 8);
+ memset(bitmap[i].bh->b_data, 0, sb_blocksize(sb));
+ reiserfs_test_and_set_le_bit(0, bitmap[i].bh->b_data);
+
+ set_buffer_uptodate(bitmap[i].bh);
+ mark_buffer_dirty(bitmap[i].bh);
+ sync_dirty_buffer(bitmap[i].bh);
+ // update bitmap_info stuff
+ bitmap[i].first_zero_hint = 1;
+ bitmap[i].free_count = sb_blocksize(sb) * 8 - 1;
+ }
+ /* free old bitmap blocks array */
+ SB_AP_BITMAP(s) = bitmap;
+ vfree(old_bitmap);
}
-
+
/* begin transaction, if there was an error, it's fine. Yes, we have
* incorrect bitmaps now, but none of it is ever going to touch the
* disk anyway. */
err = journal_begin(&th, s, 10);
if (err)
- return err;
+ return err;
/* correct last bitmap blocks in old and new disk layout */
reiserfs_prepare_for_journal(s, SB_AP_BITMAP(s)[bmap_nr - 1].bh, 1);
for (i = block_r; i < s->s_blocksize * 8; i++)
- reiserfs_test_and_clear_le_bit(i,
- SB_AP_BITMAP(s)[bmap_nr - 1].bh->b_data);
+ reiserfs_test_and_clear_le_bit(i,
+ SB_AP_BITMAP(s)[bmap_nr -
+ 1].bh->b_data);
SB_AP_BITMAP(s)[bmap_nr - 1].free_count += s->s_blocksize * 8 - block_r;
- if ( !SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint)
- SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint = block_r;
+ if (!SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint)
+ SB_AP_BITMAP(s)[bmap_nr - 1].first_zero_hint = block_r;
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].bh, 1);
for (i = block_r_new; i < s->s_blocksize * 8; i++)
- reiserfs_test_and_set_le_bit(i,
- SB_AP_BITMAP(s)[bmap_nr_new - 1].bh->b_data);
+ reiserfs_test_and_set_le_bit(i,
+ SB_AP_BITMAP(s)[bmap_nr_new -
+ 1].bh->b_data);
journal_mark_dirty(&th, s, SB_AP_BITMAP(s)[bmap_nr_new - 1].bh);
-
- SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count -= s->s_blocksize * 8 - block_r_new;
+
+ SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count -=
+ s->s_blocksize * 8 - block_r_new;
/* Extreme case where last bitmap is the only valid block in itself. */
- if ( !SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count )
- SB_AP_BITMAP(s)[bmap_nr_new - 1].first_zero_hint = 0;
- /* update super */
- reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1) ;
+ if (!SB_AP_BITMAP(s)[bmap_nr_new - 1].free_count)
+ SB_AP_BITMAP(s)[bmap_nr_new - 1].first_zero_hint = 0;
+ /* update super */
+ reiserfs_prepare_for_journal(s, SB_BUFFER_WITH_SB(s), 1);
free_blocks = SB_FREE_BLOCKS(s);
- PUT_SB_FREE_BLOCKS(s, free_blocks + (block_count_new - block_count - (bmap_nr_new - bmap_nr)));
+ PUT_SB_FREE_BLOCKS(s,
+ free_blocks + (block_count_new - block_count -
+ (bmap_nr_new - bmap_nr)));
PUT_SB_BLOCK_COUNT(s, block_count_new);
PUT_SB_BMAP_NR(s, bmap_nr_new);
s->s_dirt = 1;
journal_mark_dirty(&th, s, SB_BUFFER_WITH_SB(s));
-
+
SB_JOURNAL(s)->j_must_wait = 1;
return journal_end(&th, s, 10);
}
git://git.onelab.eu / linux-2.6.git / blobdiff