Users report a bug, the reproducer is:
$ mkfs.btrfs /dev/loop0
$ mount /dev/loop0 /mnt/btrfs/
$ mkdir /mnt/btrfs/dir
$ chattr +C /mnt/btrfs/dir/
$ dd if=/dev/zero of=/mnt/btrfs/dir/foo bs=4K count=10;
$ lsattr /mnt/btrfs/dir/foo
---------------C- /mnt/btrfs/dir/foo
$ filefrag /mnt/btrfs/dir/foo
/mnt/btrfs/dir/foo: 1 extent found ---> an extent
$ dd if=/dev/zero of=/mnt/btrfs/dir/foo bs=4K count=1 seek=5
conv=notrunc,nocreat; sync
$ filefrag /mnt/btrfs/dir/foo
/mnt/btrfs/dir/foo: 3 extents found ---> with nocow, btrfs breaks the extent
into three parts
The new created file should not only inherit the NODATACOW flag, but also
honor NODATASUM flag, because we must do COW on a file extent with checksum.
Signed-off-by: Liu Bo <bo.li....@oracle.com>
---
fs/btrfs/inode.c | 3 +--
fs/btrfs/ioctl.c | 3 ++-
2 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index b2c3514..9bce6e9 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -4720,8 +4720,7 @@ static struct inode *btrfs_new_inode(struct
btrfs_trans_handle *trans,
if (S_ISREG(mode)) {
if (btrfs_test_opt(root, NODATASUM))
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM;
- if (btrfs_test_opt(root, NODATACOW) ||
- (BTRFS_I(dir)->flags & BTRFS_INODE_NODATACOW))
+ if (btrfs_test_opt(root, NODATACOW))
BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
}
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 00ddf22..7390b25 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -141,7 +141,8 @@ void btrfs_inherit_iflags(struct inode *inode, struct inode
*dir)
}
if (flags & BTRFS_INODE_NODATACOW)
- BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW;
+ BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW |
+ BTRFS_INODE_NODATASUM;
btrfs_update_iflags(inode);
}
--
1.7.7.6
--
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