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[PATCH] ufs: right block allocation 

* After block allocation, we map it on the same "address" as 8 others
  blocks

* We nullify block several times: once in ufs/block.c and once in
  block_*write_full_page, and use different "caches" for this.

Signed-off-by: Evgeniy Dushistov <dushistov@mail.ru>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Evgeniy Dushistov 2006-06-25 05:47:19 -07:00 committed by Linus Torvalds
parent 2061df0f89
commit c9a27b5dca
2 changed files with 18 additions and 27 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

15
fs/ufs/balloc.c
View File

@ -223,18 +223,6 @@ failed:
}
#define NULLIFY_FRAGMENTS \
for (i = oldcount; i < newcount; i++) { \
bh = sb_getblk(sb, result + i); \
memset (bh->b_data, 0, sb->s_blocksize); \
set_buffer_uptodate(bh); \
mark_buffer_dirty (bh); \
if (IS_SYNC(inode)) \
sync_dirty_buffer(bh); \
brelse (bh); \
}
unsigned ufs_new_fragments (struct inode * inode, __fs32 * p, unsigned fragment,
unsigned goal, unsigned count, int * err )
{
@ -312,7 +300,6 @@ unsigned ufs_new_fragments (struct inode * inode, __fs32 * p, unsigned fragment,
*err = 0;
inode->i_blocks += count << uspi->s_nspfshift;
UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
NULLIFY_FRAGMENTS
}
unlock_super(sb);
UFSD(("EXIT, result %u\n", result))
@ -327,7 +314,6 @@ unsigned ufs_new_fragments (struct inode * inode, __fs32 * p, unsigned fragment,
*err = 0;
inode->i_blocks += count << uspi->s_nspfshift;
UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
NULLIFY_FRAGMENTS
unlock_super(sb);
UFSD(("EXIT, result %u\n", result))
return result;
@ -379,7 +365,6 @@ unsigned ufs_new_fragments (struct inode * inode, __fs32 * p, unsigned fragment,
*err = 0;
inode->i_blocks += count << uspi->s_nspfshift;
UFS_I(inode)->i_lastfrag = max_t(u32, UFS_I(inode)->i_lastfrag, fragment + count);
NULLIFY_FRAGMENTS
unlock_super(sb);
if (newcount < request)
ufs_free_fragments (inode, result + newcount, request - newcount);

30
fs/ufs/inode.c
View File

@ -161,6 +161,17 @@ out:
return ret;
}
static void ufs_clear_block(struct inode *inode, struct buffer_head *bh)
{
lock_buffer(bh);
memset(bh->b_data, 0, inode->i_sb->s_blocksize);
set_buffer_uptodate(bh);
mark_buffer_dirty(bh);
unlock_buffer(bh);
if (IS_SYNC(inode))
sync_dirty_buffer(bh);
}
static struct buffer_head * ufs_inode_getfrag (struct inode *inode,
unsigned int fragment, unsigned int new_fragment,
unsigned int required, int *err, int metadata, long *phys, int *new)
@ -204,7 +215,7 @@ repeat:
brelse (result);
goto repeat;
} else {
*phys = tmp;
*phys = tmp + blockoff;
return NULL;
}
}
@ -259,14 +270,11 @@ repeat:
return NULL;
}
/* The nullification of framgents done in ufs/balloc.c is
* something I don't have the stomache to move into here right
* now. -DaveM
*/
if (metadata) {
result = sb_getblk(inode->i_sb, tmp + blockoff);
ufs_clear_block(inode, result);
} else {
*phys = tmp;
*phys = tmp + blockoff;
result = NULL;
*err = 0;
*new = 1;
@ -333,7 +341,7 @@ repeat:
brelse (result);
goto repeat;
} else {
*phys = tmp;
*phys = tmp + blockoff;
goto out;
}
}
@ -349,14 +357,12 @@ repeat:
goto out;
}
/* The nullification of framgents done in ufs/balloc.c is
* something I don't have the stomache to move into here right
* now. -DaveM
*/
if (metadata) {
result = sb_getblk(sb, tmp + blockoff);
ufs_clear_block(inode, result);
} else {
*phys = tmp;
*phys = tmp + blockoff;
*new = 1;
}