From 4a001071d3549f596c7c3736c5dda8a3a4aba9ed Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Mon, 7 Jun 2010 03:38:51 +0000 Subject: Btrfs: fix loop device on top of btrfs We cannot use the loop device which has been connected to a file in the btrf The reproduce steps is following: # dd if=/dev/zero of=vdev0 bs=1M count=1024 # losetup /dev/loop0 vdev0 # mkfs.btrfs /dev/loop0 ... failed to zero device start -5 The reason is that the btrfs don't implement either ->write_begin or ->write the VFS API, so we fix it by setting ->write to do_sync_write(). Signed-off-by: Miao Xie Signed-off-by: Chris Mason --- fs/btrfs/file.c | 1 + 1 file changed, 1 insertion(+) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index 79437c5..abcb918 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1197,6 +1197,7 @@ static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) const struct file_operations btrfs_file_operations = { .llseek = generic_file_llseek, .read = do_sync_read, + .write = do_sync_write, .aio_read = generic_file_aio_read, .splice_read = generic_file_splice_read, .aio_write = btrfs_file_aio_write, -- cgit v1.1 From 836097797236fd727f82ec2f3f376ac41a430876 Mon Sep 17 00:00:00 2001 From: Josef Bacik Date: Mon, 7 Jun 2010 18:26:37 +0000 Subject: Btrfs: fix fallocate regression Seems that when btrfs_fallocate was converted to use the new ENOSPC stuff we dropped passing the mode to the function that actually does the preallocation. This breaks anybody who wants to use FALLOC_FL_KEEP_SIZE. Thanks, Signed-off-by: Josef Bacik Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index 2551b80..d999c53 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -6893,7 +6893,7 @@ static long btrfs_fallocate(struct inode *inode, int mode, if (em->block_start == EXTENT_MAP_HOLE || (cur_offset >= inode->i_size && !test_bit(EXTENT_FLAG_PREALLOC, &em->flags))) { - ret = btrfs_prealloc_file_range(inode, 0, cur_offset, + ret = btrfs_prealloc_file_range(inode, mode, cur_offset, last_byte - cur_offset, 1 << inode->i_blkbits, offset + len, -- cgit v1.1 From 0e4dcbef1c0c3e29f9c7f824359445d385b2649a Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Tue, 1 Jun 2010 08:23:11 +0000 Subject: Btrfs: uninitialized data is check_path_shared() refs can be used with uninitialized data if btrfs_lookup_extent_info() fails on the first pass through the loop. In the original code if that happens then check_path_shared() probably returns 1, this patch changes it to return 1 for safety. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/inode.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index d999c53..f08427c 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -2673,7 +2673,7 @@ static int check_path_shared(struct btrfs_root *root, struct extent_buffer *eb; int level; int ret; - u64 refs; + u64 refs = 1; for (level = 0; level < BTRFS_MAX_LEVEL; level++) { if (!path->nodes[level]) -- cgit v1.1 From 058a457ef0ce28d595af53d6103db73332383cbc Mon Sep 17 00:00:00 2001 From: Miao Xie Date: Thu, 20 May 2010 07:21:50 +0000 Subject: Btrfs: fix remap_file_pages error when we use remap_file_pages() to remap a file, remap_file_pages always return error. It is because btrfs didn't set VM_CAN_NONLINEAR for vma. Signed-off-by: Miao Xie Signed-off-by: Chris Mason --- fs/btrfs/file.c | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index abcb918..ce0cd29 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1189,8 +1189,15 @@ static const struct vm_operations_struct btrfs_file_vm_ops = { static int btrfs_file_mmap(struct file *filp, struct vm_area_struct *vma) { - vma->vm_ops = &btrfs_file_vm_ops; + struct address_space *mapping = filp->f_mapping; + + if (!mapping->a_ops->readpage) + return -ENOEXEC; + file_accessed(filp); + vma->vm_ops = &btrfs_file_vm_ops; + vma->vm_flags |= VM_CAN_NONLINEAR; + return 0; } -- cgit v1.1 From 046f264f6b3b2cf7e5a1769fc92335d8a9316282 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Mon, 31 May 2010 08:58:47 +0000 Subject: Btrfs: Fix null dereference in relocation.c Fix a potential null dereference in relocation.c Signed-off-by: Yan Zheng Acked-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/relocation.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/fs/btrfs/relocation.c b/fs/btrfs/relocation.c index 05d41e5..b37d723 100644 --- a/fs/btrfs/relocation.c +++ b/fs/btrfs/relocation.c @@ -784,16 +784,17 @@ again: struct btrfs_extent_ref_v0 *ref0; ref0 = btrfs_item_ptr(eb, path1->slots[0], struct btrfs_extent_ref_v0); - root = find_tree_root(rc, eb, ref0); - if (!root->ref_cows) - cur->cowonly = 1; if (key.objectid == key.offset) { + root = find_tree_root(rc, eb, ref0); if (root && !should_ignore_root(root)) cur->root = root; else list_add(&cur->list, &useless); break; } + if (is_cowonly_root(btrfs_ref_root_v0(eb, + ref0))) + cur->cowonly = 1; } #else BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY); -- cgit v1.1 From 3bf84a5a834d13e7c5c3e8e5b5c6b26012118dd8 Mon Sep 17 00:00:00 2001 From: "Yan, Zheng" Date: Mon, 31 May 2010 09:04:46 +0000 Subject: Btrfs: Fix BUG_ON for fs converted from extN Tree blocks can live in data block groups in FS converted from extN. So it's easy to trigger the BUG_ON. Signed-off-by: Yan Zheng Signed-off-by: Chris Mason --- fs/btrfs/extent-tree.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/fs/btrfs/extent-tree.c b/fs/btrfs/extent-tree.c index 6c14101..a46b64d 100644 --- a/fs/btrfs/extent-tree.c +++ b/fs/btrfs/extent-tree.c @@ -4360,7 +4360,8 @@ void btrfs_free_tree_block(struct btrfs_trans_handle *trans, block_rsv = get_block_rsv(trans, root); cache = btrfs_lookup_block_group(root->fs_info, buf->start); - BUG_ON(block_rsv->space_info != cache->space_info); + if (block_rsv->space_info != cache->space_info) + goto out; if (btrfs_header_generation(buf) == trans->transid) { if (root->root_key.objectid != BTRFS_TREE_LOG_OBJECTID) { -- cgit v1.1 From fb4f6f910ca6f58564c31a680ef88940d8192713 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:40:57 +0000 Subject: Btrfs: handle error returns from btrfs_lookup_dir_item() If btrfs_lookup_dir_item() fails, we should can just let the mount fail with an error. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/super.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 574285c..9ea7114 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -360,6 +360,8 @@ static struct dentry *get_default_root(struct super_block *sb, */ dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); di = btrfs_lookup_dir_item(NULL, root, path, dir_id, "default", 7, 0); + if (IS_ERR(di)) + return ERR_CAST(di); if (!di) { /* * Ok the default dir item isn't there. This is weird since -- cgit v1.1 From 676e4c86391936795c82ccd11ca9671ee6307936 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:43:07 +0000 Subject: Btrfs: handle kzalloc() failure in open_ctree() Unwind and return -ENOMEM if the allocation fails here. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index f3b287c..73895ba 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1941,8 +1941,11 @@ struct btrfs_root *open_ctree(struct super_block *sb, btrfs_level_size(tree_root, btrfs_super_log_root_level(disk_super)); - log_tree_root = kzalloc(sizeof(struct btrfs_root), - GFP_NOFS); + log_tree_root = kzalloc(sizeof(struct btrfs_root), GFP_NOFS); + if (!log_tree_root) { + err = -ENOMEM; + goto fail_trans_kthread; + } __setup_root(nodesize, leafsize, sectorsize, stripesize, log_tree_root, fs_info, BTRFS_TREE_LOG_OBJECTID); -- cgit v1.1 From 4cbd1149fbcc351bdf08ab749867d157905d0d35 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:42:19 +0000 Subject: Btrfs: btrfs_iget() returns ERR_PTR btrfs_iget() returns an ERR_PTR() on failure and not null. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/super.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index 9ea7114..859ddaa 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -392,8 +392,8 @@ setup_root: location.offset = 0; inode = btrfs_iget(sb, &location, new_root, &new); - if (!inode) - return ERR_PTR(-ENOMEM); + if (IS_ERR(inode)) + return ERR_CAST(inode); /* * If we're just mounting the root most subvol put the inode and return -- cgit v1.1 From d327099a23e3d0c8ec09137e9b4b115449d4eb29 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:46:47 +0000 Subject: Btrfs: unwind after btrfs_start_transaction() errors This was added by a22285a6a3: "Btrfs: Integrate metadata reservation with start_transaction". If we goto out here then we skip all the unwinding and there are locks still held etc. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 4cdb98c..9f9a1d9 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1280,7 +1280,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file, trans = btrfs_start_transaction(root, 0); if (IS_ERR(trans)) { err = PTR_ERR(trans); - goto out; + goto out_up_write; } trans->block_rsv = &root->fs_info->global_block_rsv; -- cgit v1.1 From 3140c9a34b44cd4013baae8704fdb34a93a44475 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:44:10 +0000 Subject: Btrfs: btrfs_read_fs_root_no_name() returns ERR_PTRs btrfs_read_fs_root_no_name() returns ERR_PTRs on error so I added a check for that. It's not clear to me if it can also return NULL pointers or not so I left the original NULL pointer check as is. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/disk-io.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c index 73895ba..34f7c37 100644 --- a/fs/btrfs/disk-io.c +++ b/fs/btrfs/disk-io.c @@ -1985,6 +1985,10 @@ struct btrfs_root *open_ctree(struct super_block *sb, fs_info->fs_root = btrfs_read_fs_root_no_name(fs_info, &location); if (!fs_info->fs_root) goto fail_trans_kthread; + if (IS_ERR(fs_info->fs_root)) { + err = PTR_ERR(fs_info->fs_root); + goto fail_trans_kthread; + } if (!(sb->s_flags & MS_RDONLY)) { down_read(&fs_info->cleanup_work_sem); -- cgit v1.1 From cf1e99a4e0daa4a5623cd71108509823b9ff2d30 Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:47:24 +0000 Subject: Btrfs: btrfs_lookup_dir_item() can return ERR_PTR btrfs_lookup_dir_item() can return either ERR_PTRs or null. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/ioctl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 9f9a1d9..4dbaf89 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -1845,7 +1845,7 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) dir_id = btrfs_super_root_dir(&root->fs_info->super_copy); di = btrfs_lookup_dir_item(trans, root->fs_info->tree_root, path, dir_id, "default", 7, 1); - if (!di) { + if (IS_ERR_OR_NULL(di)) { btrfs_free_path(path); btrfs_end_transaction(trans, root); printk(KERN_ERR "Umm, you don't have the default dir item, " -- cgit v1.1 From 2f26afba46f0ebf155cf9be746496a0304a5b7cf Mon Sep 17 00:00:00 2001 From: Shi Weihua Date: Tue, 18 May 2010 00:50:32 +0000 Subject: Btrfs: should add a permission check for setfacl On btrfs, do the following ------------------ # su user1 # cd btrfs-part/ # touch aaa # getfacl aaa # file: aaa # owner: user1 # group: user1 user::rw- group::rw- other::r-- # su user2 # cd btrfs-part/ # setfacl -m u::rwx aaa # getfacl aaa # file: aaa # owner: user1 # group: user1 user::rwx <- successed to setfacl group::rw- other::r-- ------------------ but we should prohibit it that user2 changing user1's acl. In fact, on ext3 and other fs, a message occurs: setfacl: aaa: Operation not permitted This patch fixed it. Signed-off-by: Shi Weihua Signed-off-by: Chris Mason --- fs/btrfs/acl.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index 6ef7b26..6b4d0cc 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -160,6 +160,9 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name, int ret; struct posix_acl *acl = NULL; + if (!is_owner_or_cap(dentry->d_inode)) + return -EPERM; + if (value) { acl = posix_acl_from_xattr(value, size); if (acl == NULL) { -- cgit v1.1 From 731e3d1b4348a96d53de6c084774424dedc64a3b Mon Sep 17 00:00:00 2001 From: Shi Weihua Date: Tue, 18 May 2010 00:51:54 +0000 Subject: Btrfs: prohibit a operation of changing acl's mask when noacl mount option used when used Posix File System Test Suite(pjd-fstest) to test btrfs, some cases about setfacl failed when noacl mount option used. I simplified used commands in pjd-fstest, and the following steps can reproduce it. ------------------------ # cd btrfs-part/ # mkdir aaa # setfacl -m m::rw aaa <- successed, but not expected by pjd-fstest. ------------------------ I checked ext3, a warning message occured, like as: setfacl: aaa/: Operation not supported Certainly, it's expected by pjd-fstest. So, i compared acl.c of btrfs and ext3. Based on that, a patch created. Fortunately, it works. Signed-off-by: Shi Weihua Signed-off-by: Chris Mason --- fs/btrfs/acl.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index 6b4d0cc..a372985 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -163,6 +163,9 @@ static int btrfs_xattr_acl_set(struct dentry *dentry, const char *name, if (!is_owner_or_cap(dentry->d_inode)) return -EPERM; + if (!IS_POSIXACL(dentry->d_inode)) + return -EOPNOTSUPP; + if (value) { acl = posix_acl_from_xattr(value, size); if (acl == NULL) { -- cgit v1.1 From 15e7000095e6fc9ad07e476a100c900c72c14225 Mon Sep 17 00:00:00 2001 From: Sage Weil Date: Mon, 17 May 2010 17:15:27 +0000 Subject: Btrfs: avoid BUG when dropping root and reference in same transaction If btrfs_ioctl_snap_destroy() deletes a snapshot but finishes with end_transaction(), the cleaner kthread may come in and drop the root in the same transaction. If that's the case, the root's refs still == 1 in the tree when btrfs_del_root() deletes the item, because commit_fs_roots() hasn't updated it yet (that happens during the commit). This wasn't a problem before only because btrfs_ioctl_snap_destroy() would commit the transaction before dropping the dentry reference, so the dead root wouldn't get queued up until after the fs root item was updated in the btree. Since it is not an error to drop the root reference and the root in the same transaction, just drop the BUG_ON() in btrfs_del_root(). Signed-off-by: Sage Weil Signed-off-by: Chris Mason --- fs/btrfs/root-tree.c | 3 --- 1 file changed, 3 deletions(-) diff --git a/fs/btrfs/root-tree.c b/fs/btrfs/root-tree.c index b91ccd9..2d958be 100644 --- a/fs/btrfs/root-tree.c +++ b/fs/btrfs/root-tree.c @@ -330,7 +330,6 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, { struct btrfs_path *path; int ret; - u32 refs; struct btrfs_root_item *ri; struct extent_buffer *leaf; @@ -344,8 +343,6 @@ int btrfs_del_root(struct btrfs_trans_handle *trans, struct btrfs_root *root, leaf = path->nodes[0]; ri = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_root_item); - refs = btrfs_disk_root_refs(leaf, ri); - BUG_ON(refs != 0); ret = btrfs_del_item(trans, root, path); out: btrfs_free_path(path); -- cgit v1.1 From 834e74759a473f8101a273e843d1edec2778801d Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:48:35 +0000 Subject: Btrfs: handle ERR_PTR from posix_acl_from_xattr() posix_acl_from_xattr() returns both ERR_PTRs and null, but it's OK to pass null values to set_cached_acl() Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/acl.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/btrfs/acl.c b/fs/btrfs/acl.c index a372985..1606dc1 100644 --- a/fs/btrfs/acl.c +++ b/fs/btrfs/acl.c @@ -60,6 +60,8 @@ static struct posix_acl *btrfs_get_acl(struct inode *inode, int type) size = __btrfs_getxattr(inode, name, value, size); if (size > 0) { acl = posix_acl_from_xattr(value, size); + if (IS_ERR(acl)) + return acl; set_cached_acl(inode, type, acl); } kfree(value); -- cgit v1.1 From 6f902af400b2499c80865c62a06fbbd15cf804fd Mon Sep 17 00:00:00 2001 From: Dan Carpenter Date: Sat, 29 May 2010 09:49:07 +0000 Subject: Btrfs: The file argument for fsync() is never null The "file" argument for fsync is never null so we can remove this check. What drew my attention here is that 7ea8085910e: "drop unused dentry argument to ->fsync" introduced an unconditional dereference at the start of the function and that generated a smatch warning. Signed-off-by: Dan Carpenter Signed-off-by: Chris Mason --- fs/btrfs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/fs/btrfs/file.c b/fs/btrfs/file.c index ce0cd29..7f29464 100644 --- a/fs/btrfs/file.c +++ b/fs/btrfs/file.c @@ -1139,7 +1139,7 @@ int btrfs_sync_file(struct file *file, struct dentry *dentry, int datasync) /* * ok we haven't committed the transaction yet, lets do a commit */ - if (file && file->private_data) + if (file->private_data) btrfs_ioctl_trans_end(file); trans = btrfs_start_transaction(root, 0); -- cgit v1.1