From d899e05215178fed903ad0e7fc1cb4d8e0cc0a88 Mon Sep 17 00:00:00 2001 From: Yan Zheng Date: Thu, 30 Oct 2008 14:25:28 -0400 Subject: Btrfs: Add fallocate support v2 This patch updates btrfs-progs for fallocate support. fallocate is a little different in Btrfs because we need to tell the COW system that a given preallocated extent doesn't need to be cow'd as long as there are no snapshots of it. This leverages the -o nodatacow checks. Signed-off-by: Yan Zheng --- fs/btrfs/extent_io.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) (limited to 'fs/btrfs/extent_io.c') diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 65a0583..eb3c12e 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -2015,6 +2015,8 @@ printk("2bad mapping end %Lu cur %Lu\n", end, cur); } bdev = em->bdev; block_start = em->block_start; + if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) + block_start = EXTENT_MAP_HOLE; free_extent_map(em); em = NULL; @@ -2769,14 +2771,18 @@ sector_t extent_bmap(struct address_space *mapping, sector_t iblock, struct inode *inode = mapping->host; u64 start = iblock << inode->i_blkbits; sector_t sector = 0; + size_t blksize = (1 << inode->i_blkbits); struct extent_map *em; - em = get_extent(inode, NULL, 0, start, (1 << inode->i_blkbits), 0); + lock_extent(&BTRFS_I(inode)->io_tree, start, start + blksize - 1, + GFP_NOFS); + em = get_extent(inode, NULL, 0, start, blksize, 0); + unlock_extent(&BTRFS_I(inode)->io_tree, start, start + blksize - 1, + GFP_NOFS); if (!em || IS_ERR(em)) return 0; - if (em->block_start == EXTENT_MAP_INLINE || - em->block_start == EXTENT_MAP_HOLE) + if (em->block_start > EXTENT_MAP_LAST_BYTE) goto out; sector = (em->block_start + start - em->start) >> inode->i_blkbits; -- cgit v1.1