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authorDave Kleikamp <shaggy@linux.vnet.ibm.com>2009-01-30 14:09:06 -0600
committerDave Kleikamp <shaggy@linux.vnet.ibm.com>2009-01-30 14:09:06 -0600
commit1ad53a98c927a9b5b1b57288ac0edec562fbcf8d (patch)
treef8de5c192927fd2594437018a6489798dbafcbed
parentb5c816a4f177604ae708892bba074b1d534fcbee (diff)
jfs: Fix error handling in metapage_writepage()
Improved error handling so that last_write_complete(), and thus end_page_writeback(), gets called only once. Signed-off-by: Dave Kleikamp <shaggy@linux.vnet.ibm.com> Reported-by: Eric Sesterhenn <snakebyte@gmx.de>
-rw-r--r--fs/jfs/jfs_metapage.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index c350057087d..07b6c5dfb4b 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -369,6 +369,7 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
unsigned long bio_bytes = 0;
unsigned long bio_offset = 0;
int offset;
+ int bad_blocks = 0;
page_start = (sector_t)page->index <<
(PAGE_CACHE_SHIFT - inode->i_blkbits);
@@ -394,6 +395,7 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
}
clear_bit(META_dirty, &mp->flag);
+ set_bit(META_io, &mp->flag);
block_offset = offset >> inode->i_blkbits;
lblock = page_start + block_offset;
if (bio) {
@@ -402,7 +404,6 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
len = min(xlen, blocks_per_mp);
xlen -= len;
bio_bytes += len << inode->i_blkbits;
- set_bit(META_io, &mp->flag);
continue;
}
/* Not contiguous */
@@ -424,12 +425,14 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
xlen = (PAGE_CACHE_SIZE - offset) >> inode->i_blkbits;
pblock = metapage_get_blocks(inode, lblock, &xlen);
if (!pblock) {
- /* Need better error handling */
printk(KERN_ERR "JFS: metapage_get_blocks failed\n");
- dec_io(page, last_write_complete);
+ /*
+ * We already called inc_io(), but can't cancel it
+ * with dec_io() until we're done with the page
+ */
+ bad_blocks++;
continue;
}
- set_bit(META_io, &mp->flag);
len = min(xlen, (int)JFS_SBI(inode->i_sb)->nbperpage);
bio = bio_alloc(GFP_NOFS, 1);
@@ -459,6 +462,9 @@ static int metapage_writepage(struct page *page, struct writeback_control *wbc)
unlock_page(page);
+ if (bad_blocks)
+ goto err_out;
+
if (nr_underway == 0)
end_page_writeback(page);
@@ -474,7 +480,9 @@ skip:
bio_put(bio);
unlock_page(page);
dec_io(page, last_write_complete);
-
+err_out:
+ while (bad_blocks--)
+ dec_io(page, last_write_complete);
return -EIO;
}