From: Curt Wohlgemuth Date: Sat, 26 Feb 2011 17:27:52 +0000 (-0500) Subject: ext4: fix ext4_da_block_invalidatepages() to handle page range properly X-Git-Tag: v2.6.39-rc1~73^2~28 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=c7f5938adce6727b9d17785f289c1146bd88d678;p=karo-tx-linux.git ext4: fix ext4_da_block_invalidatepages() to handle page range properly If ext4_da_block_invalidatepages() is called because of a failure from ext4_map_blocks() in mpage_da_map_and_submit(), it's supposed to clean up -- including unlock -- all the pages in the mpd structure. But these values may not match up, even on a system in which block size == page size: mpd->b_blocknr != mpd->first_page mpd->b_size != (mpd->next_page - mpd->first_page) ext4_da_block_invalidatepages() has been using b_blocknr and b_size; this patch changes it to use first_page and next_page. Tested: I injected a small number (5%) of failures in ext4_map_blocks() in the case that the flags contain EXT4_GET_BLOCKS_DELALLOC_RESERVE, and ran fsstress on this kernel. Without this patch, I got hung tasks every time. With this patch, I see no hangs in many runs of fsstress. Signed-off-by: Curt Wohlgemuth Signed-off-by: "Theodore Ts'o" --- diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index fd369dbce6af..e878c3a7aaf0 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2165,8 +2165,7 @@ static int mpage_da_submit_io(struct mpage_da_data *mpd, return ret; } -static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd, - sector_t logical, long blk_cnt) +static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd) { int nr_pages, i; pgoff_t index, end; @@ -2174,9 +2173,8 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd, struct inode *inode = mpd->inode; struct address_space *mapping = inode->i_mapping; - index = logical >> (PAGE_CACHE_SHIFT - inode->i_blkbits); - end = (logical + blk_cnt - 1) >> - (PAGE_CACHE_SHIFT - inode->i_blkbits); + index = mpd->first_page; + end = mpd->next_page - 1; while (index <= end) { nr_pages = pagevec_lookup(&pvec, mapping, index, PAGEVEC_SIZE); if (nr_pages == 0) @@ -2312,8 +2310,7 @@ static void mpage_da_map_and_submit(struct mpage_da_data *mpd) ext4_print_free_blocks(mpd->inode); } /* invalidate all the pages */ - ext4_da_block_invalidatepages(mpd, next, - mpd->b_size >> mpd->inode->i_blkbits); + ext4_da_block_invalidatepages(mpd); /* Mark this page range as having been completed */ mpd->io_done = 1;