From cbcc83265d929ac71553c1b5dafdb830171af947 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Fri, 2 Sep 2011 15:56:25 +0800 Subject: [PATCH] Btrfs: fix defragmentation regression There's an off-by-one bug: # create a file with lots of 4K file extents # btrfs fi defrag /mnt/file # sync # filefrag -v /mnt/file Filesystem type is: 9123683e File size of /mnt/file is 1228800 (300 blocks, blocksize 4096) ext logical physical expected length flags 0 0 3372 64 1 64 3136 3435 1 2 65 3436 3136 64 3 129 3201 3499 1 4 130 3500 3201 64 5 194 3266 3563 1 6 195 3564 3266 64 7 259 3331 3627 1 8 260 3628 3331 40 eof After this patch: ... # filefrag -v /mnt/file Filesystem type is: 9123683e File size of /mnt/file is 1228800 (300 blocks, blocksize 4096) ext logical physical expected length flags 0 0 3372 300 eof /mnt/file: 1 extent found Signed-off-by: Li Zefan --- fs/btrfs/ioctl.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 8ccc106f4e1..b39f7bf9270 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1087,7 +1087,6 @@ int btrfs_defrag_file(struct inode *inode, struct file *file, defrag_count += ret; balance_dirty_pages_ratelimited_nr(inode->i_mapping, ret); - i += ret; if (newer_than) { if (newer_off == (u64)-1) @@ -1107,7 +1106,10 @@ int btrfs_defrag_file(struct inode *inode, struct file *file, break; } } else { - i++; + if (ret > 0) + i += ret; + else + i++; } } -- 2.41.0