I sent such patch some time ago but was rejected by Chris, hopes this time it can be accepted.
This one can make btrfs much more robust. Thanks, Qu -------- Original Message -------- Subject: [PATCH] Revert "Btrfs: allow superblock mismatch from older mkfs" From: Liu Bo <[email protected]> To: <[email protected]> Date: 2015年03月12日 13:40
This reverts commit 667e7d94a1683661cff5fe9a0fa0d7f8fdd2c007. This was used to make sure that a fresh btrfs from an older mkfs.btrfs, and it also allows us to mount a buggy btrfs if this btrfs has the right superblock head part but has something wrong with chunk tree part[1], and after that we can hit BUG_ON()s set in the code to prevent something impossible. Since David has gave us "Btrfs progs v3.19-rc2", just remove the check, if anyone who wants to make a fresh btrfs, please use the latest one. [1]: http://www.spinics.net/lists/linux-btrfs/msg42358.html Signed-off-by: Liu Bo <[email protected]> Conflicts: fs/btrfs/disk-io.c --- fs/btrfs/disk-io.c | 6 ------ 1 file changed, 6 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 41b320e..f63aacf 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -418,12 +418,6 @@ static int btrfs_check_super_csum(char *raw_disk_sb) if (memcmp(raw_disk_sb, result, csum_size)) ret = 1; - - if (ret && btrfs_super_generation(disk_sb) < 10) { - printk(KERN_WARNING - "BTRFS: super block crcs don't match, older mkfs detected\n"); - ret = 0; - } } if (csum_type >= ARRAY_SIZE(btrfs_csum_sizes)) {
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