From: Chris Mason Date: Fri, 21 Dec 2007 21:27:23 +0000 (-0500) Subject: Btrfs: Fix an off by one in the extent_map prepare write code X-Git-Tag: v2.6.29-rc1~27^2~9^2~55^2~56^2~30^2~367 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=5d4fb734b4cb89a3902d6de309af0f6f3e63fe73;p=karo-tx-linux.git Btrfs: Fix an off by one in the extent_map prepare write code Signed-off-by: Chris Mason --- diff --git a/fs/btrfs/extent_map.c b/fs/btrfs/extent_map.c index 2b92f1070274..f53d8c976219 100644 --- a/fs/btrfs/extent_map.c +++ b/fs/btrfs/extent_map.c @@ -2270,7 +2270,7 @@ int extent_prepare_write(struct extent_map_tree *tree, kunmap_atomic(kaddr, KM_USER0); } if ((em->block_start != EXTENT_MAP_HOLE && - em->block_start != EXTENT_MAP_INLINE) && + em->block_start != EXTENT_MAP_INLINE) && !isnew && !PageUptodate(page) && (block_off_end > to || block_off_start < from) && !test_range_bit(tree, block_start, cur_end, @@ -2279,7 +2279,7 @@ int extent_prepare_write(struct extent_map_tree *tree, u64 extent_offset = block_start - em->start; size_t iosize; sector = (em->block_start + extent_offset) >> 9; - iosize = (cur_end - block_start + blocksize - 1) & + iosize = (cur_end - block_start + blocksize) & ~((u64)blocksize - 1); /* * we've already got the extent locked, but we diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index a9f5d6d417f0..5f5b7b89b144 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -1956,7 +1956,7 @@ static int btrfs_prepare_write(struct file *file, struct page *page, mutex_lock(&root->fs_info->fs_mutex); err = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0); - mutex_lock(&root->fs_info->fs_mutex); + mutex_unlock(&root->fs_info->fs_mutex); if (err) return -ENOSPC;