From 3765fefaee2da83f10829fa64a74e6b7360350cb Mon Sep 17 00:00:00 2001 From: Hidetoshi Seto Date: Sun, 18 Sep 2011 10:20:46 -0400 Subject: btrfs: fix d_off in the first dirent Since the d_off in the first dirent for "." (that originates from the 4th argument "offset" of filldir() for the 2nd dirent for "..") is wrongly assigned in btrfs_real_readdir(), telldir returns same offset for different locations. | # mkfs.btrfs /dev/sdb1 | # mount /dev/sdb1 fs0 | # cd fs0 | # touch file0 file1 | # ../test | telldir: 0 | readdir: d_off = 2, d_name = "." | telldir: 2 | readdir: d_off = 2, d_name = ".." | telldir: 2 | readdir: d_off = 3, d_name = "file0" | telldir: 3 | readdir: d_off = 2147483647, d_name = "file1" | telldir: 2147483647 To fix this problem, pass filp->f_pos (which is loff_t) instead. | # ../test | telldir: 0 | readdir: d_off = 1, d_name = "." | telldir: 1 | readdir: d_off = 2, d_name = ".." | telldir: 2 | readdir: d_off = 3, d_name = "file0" : At the moment the "offset" for "." is unused because there is no preceding dirent, however it is better to pass filp->f_pos to follow grammatical usage. Signed-off-by: Hidetoshi Seto Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index b94c0da3b43f..ba951764b005 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -4117,7 +4117,8 @@ static int btrfs_real_readdir(struct file *filp, void *dirent, /* special case for "." */ if (filp->f_pos == 0) { - over = filldir(dirent, ".", 1, 1, btrfs_ino(inode), DT_DIR); + over = filldir(dirent, ".", 1, + filp->f_pos, btrfs_ino(inode), DT_DIR); if (over) return 0; filp->f_pos = 1; @@ -4126,7 +4127,7 @@ static int btrfs_real_readdir(struct file *filp, void *dirent, if (filp->f_pos == 1) { u64 pino = parent_ino(filp->f_path.dentry); over = filldir(dirent, "..", 2, - 2, pino, DT_DIR); + filp->f_pos, pino, DT_DIR); if (over) return 0; filp->f_pos = 2; -- cgit v1.2.3 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(-) 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(+) 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(-) 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