From 71ef07861080418d125dcf454af41baafa409a2c Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Sun, 18 Sep 2011 10:20:46 -0400 Subject: Btrfs: fix pages truncation in btrfs_ioctl_clone() It's a bug in commit f81c9cdc567cd3160ff9e64868d9a1a7ee226480 (Btrfs: truncate pages from clone ioctl target range) We should pass the dest range to the truncate function, but not the src range. Also move the function before locking extent state. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs/btrfs/ioctl.c') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 63b4de1626d2..8bfb514b26c9 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2234,6 +2234,10 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, goto out_unlock; } + /* truncate page cache pages from target inode range */ + truncate_inode_pages_range(&inode->i_data, destoff, + PAGE_CACHE_ALIGN(destoff + len) - 1); + /* do any pending delalloc/csum calc on src, one way or another, and lock file content */ while (1) { @@ -2250,10 +2254,6 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, btrfs_wait_ordered_range(src, off, len); } - /* truncate page cache pages from target inode range */ - truncate_inode_pages_range(&inode->i_data, off, - ALIGN(off + len, PAGE_CACHE_SIZE) - 1); - /* clone data */ key.objectid = btrfs_ino(src); key.type = BTRFS_EXTENT_DATA_KEY; -- cgit v1.2.3 From 0e7b824c4ef9f5bcf5e48cdce164a7b349dde969 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Sun, 18 Sep 2011 10:20:46 -0400 Subject: Btrfs: don't make a file partly checksummed through file clone To reproduce the bug: # mount /dev/sda7 /mnt # dd if=/dev/zero of=/mnt/src bs=4K count=1 # umount /mnt # mount -o nodatasum /dev/sda7 /mnt # dd if=/dev/zero of=/mnt/dst bs=4K count=1 # clone_range -s 4K -l 4K /mnt/src /mnt/dst # echo 3 > /proc/sys/vm/drop_caches # cat /mnt/dst # dmesg ... btrfs no csum found for inode 258 start 0 btrfs csum failed ino 258 off 0 csum 2566472073 private 0 It's because part of the file is checksummed and the other part is not, and then btrfs will complain checksum is not found when we read the file. Disallow file clone if src and dst file have different checksum flag, so we ensure a file is completely checksummed or unchecksummed. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'fs/btrfs/ioctl.c') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 8bfb514b26c9..1e766e86f334 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2185,6 +2185,11 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, if (!(src_file->f_mode & FMODE_READ)) goto out_fput; + /* don't make the dst file partly checksummed */ + if ((BTRFS_I(src)->flags & BTRFS_INODE_NODATASUM) != + (BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM)) + goto out_fput; + ret = -EISDIR; if (S_ISDIR(src->i_mode) || S_ISDIR(inode->i_mode)) goto out_fput; -- cgit v1.2.3 From dde820fbf7176b64daddc1856597d9c61dac19e2 Mon Sep 17 00:00:00 2001 From: Li Zefan Date: Sun, 18 Sep 2011 10:20:46 -0400 Subject: Btrfs: don't change inode flag of the dest clone file The dst file will have the same inode flags with dst file after file clone, and I think it's unexpected. For example, the dst file will suddenly become immutable after getting some share of data with src file, if the src is immutable. Signed-off-by: Li Zefan Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 1 - 1 file changed, 1 deletion(-) (limited to 'fs/btrfs/ioctl.c') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 1e766e86f334..9947a0ac7bd5 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2455,7 +2455,6 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, if (endoff > inode->i_size) btrfs_i_size_write(inode, endoff); - BTRFS_I(inode)->flags = BTRFS_I(src)->flags; ret = btrfs_update_inode(trans, root, inode); BUG_ON(ret); btrfs_end_transaction(trans, root); -- cgit v1.2.3 From b6f3409b2197e8fcedb43e6600e37b7cfbe0715b Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Tue, 20 Sep 2011 14:48:51 -0400 Subject: Btrfs: reserve sufficient space for ioctl clone Fix a crash/BUG_ON in the clone ioctl due to insufficient reservation. We need to reserve space for: - adjusting the old extent (possibly splitting it) - adding the new extent - updating the inode Signed-off-by: Sage Weil Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) (limited to 'fs/btrfs/ioctl.c') diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 9947a0ac7bd5..6f89bcc4e555 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -2336,7 +2336,12 @@ static noinline long btrfs_ioctl_clone(struct file *file, unsigned long srcfd, else new_key.offset = destoff; - trans = btrfs_start_transaction(root, 1); + /* + * 1 - adjusting old extent (we may have to split it) + * 1 - add new extent + * 1 - inode update + */ + trans = btrfs_start_transaction(root, 3); if (IS_ERR(trans)) { ret = PTR_ERR(trans); goto out; -- cgit v1.2.3