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[PATCH] md: Change md/bitmap file handling to use bmap to file blocks-fix

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Fix problems with new bmap based access to bitmap files.

1/ When not using a file based bitmap, attach a NULL list of buffers
   to each page so the common free_buffer routine can cope.
2/ Use submit_bh to read as well as write, rather than vfs_read.
   This makes read and write more symetric.
3/ sync the file before reading, to ensure that the page cache has no
   dirty pages that might get written out later.

Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
NeilBrown 2006-06-26 00:27:49 -07:00 committed by Linus Torvalds
parent d785a06a0b
commit ce25c31bdd
1 changed files with 23 additions and 24 deletions
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47
drivers/md/bitmap.c
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@ -247,6 +247,8 @@ static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long inde
if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) {
page->index = index;
attach_page_buffers(page, NULL); /* so that free_buffer will
* quietly no-op */
return page;
}
}
@ -349,11 +351,8 @@ static struct page *read_page(struct file *file, unsigned long index,
{
struct page *page = NULL;
struct inode *inode = file->f_dentry->d_inode;
loff_t pos = index << PAGE_SHIFT;
int ret;
struct buffer_head *bh;
sector_t block;
mm_segment_t oldfs;
PRINTK("read bitmap file (%dB @ %Lu)\n", (int)PAGE_SIZE,
(unsigned long long)index << PAGE_SHIFT);
@ -364,18 +363,6 @@ static struct page *read_page(struct file *file, unsigned long index,
if (IS_ERR(page))
goto out;
oldfs = get_fs();
set_fs(KERNEL_DS);
ret = vfs_read(file, (char __user*) page_address(page), count, &pos);
set_fs(oldfs);
if (ret >= 0 && ret != count)
ret = -EIO;
if (ret < 0) {
put_page(page);
page = ERR_PTR(ret);
goto out;
}
bh = alloc_page_buffers(page, 1<<inode->i_blkbits, 0);
if (!bh) {
put_page(page);
@ -403,12 +390,22 @@ static struct page *read_page(struct file *file, unsigned long index,
bh->b_end_io = end_bitmap_write;
bh->b_private = bitmap;
atomic_inc(&bitmap->pending_writes);
set_buffer_locked(bh);
set_buffer_mapped(bh);
submit_bh(READ, bh);
}
block++;
bh = bh->b_this_page;
}
page->index = index;
wait_event(bitmap->write_wait,
atomic_read(&bitmap->pending_writes)==0);
if (bitmap->flags & BITMAP_WRITE_ERROR) {
free_buffers(page);
page = ERR_PTR(-EIO);
}
out:
if (IS_ERR(page))
printk(KERN_ALERT "md: bitmap read error: (%dB @ %Lu): %ld\n",
@ -1415,15 +1412,20 @@ int bitmap_create(mddev_t *mddev)
return -ENOMEM;
spin_lock_init(&bitmap->lock);
atomic_set(&bitmap->pending_writes, 0);
init_waitqueue_head(&bitmap->write_wait);
bitmap->mddev = mddev;
bitmap->file = file;
bitmap->offset = mddev->bitmap_offset;
if (file) get_file(file);
/* Ensure we read fresh data */
invalidate_inode_pages(file->f_dentry->d_inode->i_mapping);
if (file) {
get_file(file);
do_sync_file_range(file, 0, LLONG_MAX,
SYNC_FILE_RANGE_WAIT_BEFORE |
SYNC_FILE_RANGE_WRITE |
SYNC_FILE_RANGE_WAIT_AFTER);
}
/* read superblock from bitmap file (this sets bitmap->chunksize) */
err = bitmap_read_sb(bitmap);
if (err)
@ -1446,9 +1448,6 @@ int bitmap_create(mddev_t *mddev)
bitmap->syncchunk = ~0UL;
atomic_set(&bitmap->pending_writes, 0);
init_waitqueue_head(&bitmap->write_wait);
#ifdef INJECT_FATAL_FAULT_1
bitmap->bp = NULL;
#else