Btrfs: Fix an off by one in the extent_map prepare write code
Signed-off-by: Chris Mason <chris.mason@oracle.com>
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@ -2270,7 +2270,7 @@ int extent_prepare_write(struct extent_map_tree *tree,
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kunmap_atomic(kaddr, KM_USER0);
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}
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if ((em->block_start != EXTENT_MAP_HOLE &&
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em->block_start != EXTENT_MAP_INLINE) &&
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em->block_start != EXTENT_MAP_INLINE) &&
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!isnew && !PageUptodate(page) &&
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(block_off_end > to || block_off_start < from) &&
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!test_range_bit(tree, block_start, cur_end,
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@ -2279,7 +2279,7 @@ int extent_prepare_write(struct extent_map_tree *tree,
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u64 extent_offset = block_start - em->start;
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size_t iosize;
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sector = (em->block_start + extent_offset) >> 9;
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iosize = (cur_end - block_start + blocksize - 1) &
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iosize = (cur_end - block_start + blocksize) &
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~((u64)blocksize - 1);
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/*
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* we've already got the extent locked, but we
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@ -1956,7 +1956,7 @@ static int btrfs_prepare_write(struct file *file, struct page *page,
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mutex_lock(&root->fs_info->fs_mutex);
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err = btrfs_check_free_space(root, PAGE_CACHE_SIZE, 0);
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mutex_lock(&root->fs_info->fs_mutex);
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mutex_unlock(&root->fs_info->fs_mutex);
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if (err)
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return -ENOSPC;
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