#include "rcu-string.h"
#include "send.h"
#include "dev-replace.h"
+#include "props.h"
+#include "sysfs.h"
static int btrfs_clone(struct inode *src, struct inode *inode,
u64 off, u64 olen, u64 olen_aligned, u64 destoff);
unsigned int i_oldflags;
umode_t mode;
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
if (btrfs_root_readonly(root))
return -EROFS;
if (ret)
return ret;
- if (!inode_owner_or_capable(inode))
- return -EACCES;
-
ret = mnt_want_write_file(file);
if (ret)
return ret;
if (flags & FS_NOCOMP_FL) {
ip->flags &= ~BTRFS_INODE_COMPRESS;
ip->flags |= BTRFS_INODE_NOCOMPRESS;
+
+ ret = btrfs_set_prop(inode, "btrfs.compression", NULL, 0, 0);
+ if (ret && ret != -ENODATA)
+ goto out_drop;
} else if (flags & FS_COMPR_FL) {
+ const char *comp;
+
ip->flags |= BTRFS_INODE_COMPRESS;
ip->flags &= ~BTRFS_INODE_NOCOMPRESS;
+
+ if (root->fs_info->compress_type == BTRFS_COMPRESS_LZO)
+ comp = "lzo";
+ else
+ comp = "zlib";
+ ret = btrfs_set_prop(inode, "btrfs.compression",
+ comp, strlen(comp), 0);
+ if (ret)
+ goto out_drop;
+
} else {
ip->flags &= ~(BTRFS_INODE_COMPRESS | BTRFS_INODE_NOCOMPRESS);
}
struct btrfs_root *new_root;
struct btrfs_block_rsv block_rsv;
struct timespec cur_time = CURRENT_TIME;
+ struct inode *inode;
int ret;
int err;
u64 objectid;
trans = btrfs_start_transaction(root, 0);
if (IS_ERR(trans)) {
ret = PTR_ERR(trans);
- goto out;
+ btrfs_subvolume_release_metadata(root, &block_rsv,
+ qgroup_reserved);
+ return ret;
}
trans->block_rsv = &block_rsv;
trans->bytes_reserved = block_rsv.size;
btrfs_record_root_in_trans(trans, new_root);
- ret = btrfs_create_subvol_root(trans, new_root, new_dirid);
+ ret = btrfs_create_subvol_root(trans, new_root, root, new_dirid);
if (ret) {
/* We potentially lose an unused inode item here */
btrfs_abort_transaction(trans, root, ret);
fail:
trans->block_rsv = NULL;
trans->bytes_reserved = 0;
+ btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
+
if (async_transid) {
*async_transid = trans->transid;
err = btrfs_commit_transaction_async(trans, root, 1);
if (err && !ret)
ret = err;
- if (!ret)
- d_instantiate(dentry, btrfs_lookup_dentry(dir, dentry));
-out:
- btrfs_subvolume_release_metadata(root, &block_rsv, qgroup_reserved);
+ if (!ret) {
+ inode = btrfs_lookup_dentry(dir, dentry);
+ if (IS_ERR(inode))
+ return PTR_ERR(inode);
+ d_instantiate(dentry, inode);
+ }
return ret;
}
ret = PTR_ERR(inode);
goto fail;
}
- BUG_ON(!inode);
+
d_instantiate(dentry, inode);
ret = 0;
fail:
static int cluster_pages_for_defrag(struct inode *inode,
struct page **pages,
unsigned long start_index,
- int num_pages)
+ unsigned long num_pages)
{
unsigned long file_end;
u64 isize = i_size_read(inode);
int defrag_count = 0;
int compress_type = BTRFS_COMPRESS_ZLIB;
int extent_thresh = range->extent_thresh;
- int max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
- int cluster = max_cluster;
+ unsigned long max_cluster = (256 * 1024) >> PAGE_CACHE_SHIFT;
+ unsigned long cluster = max_cluster;
u64 new_align = ~((u64)128 * 1024 - 1);
struct page **pages = NULL;
break;
if (btrfs_defrag_cancelled(root->fs_info)) {
- printk(KERN_DEBUG "btrfs: defrag_file cancelled\n");
+ printk(KERN_DEBUG "BTRFS: defrag_file cancelled\n");
ret = -EAGAIN;
break;
}
ret = -EINVAL;
goto out_free;
}
- printk(KERN_INFO "btrfs: resizing devid %llu\n", devid);
+ btrfs_info(root->fs_info, "resizing devid %llu", devid);
}
device = btrfs_find_device(root->fs_info, devid, NULL, NULL);
if (!device) {
- printk(KERN_INFO "btrfs: resizer unable to find device %llu\n",
+ btrfs_info(root->fs_info, "resizer unable to find device %llu",
devid);
ret = -ENODEV;
goto out_free;
}
if (!device->writeable) {
- printk(KERN_INFO "btrfs: resizer unable to apply on "
- "readonly device %llu\n",
+ btrfs_info(root->fs_info,
+ "resizer unable to apply on readonly device %llu",
devid);
ret = -EPERM;
goto out_free;
}
new_size = old_size - new_size;
} else if (mod > 0) {
+ if (new_size > ULLONG_MAX - old_size) {
+ ret = -EINVAL;
+ goto out_free;
+ }
new_size = old_size + new_size;
}
do_div(new_size, root->sectorsize);
new_size *= root->sectorsize;
- printk_in_rcu(KERN_INFO "btrfs: new size for %s is %llu\n",
+ printk_in_rcu(KERN_INFO "BTRFS: new size for %s is %llu\n",
rcu_str_deref(device->name), new_size);
if (new_size > old_size) {
src_inode = file_inode(src.file);
if (src_inode->i_sb != file_inode(file)->i_sb) {
- printk(KERN_INFO "btrfs: Snapshot src from "
- "another FS\n");
+ btrfs_info(BTRFS_I(src_inode)->root->fs_info,
+ "Snapshot src from another FS");
ret = -EINVAL;
+ } else if (!inode_owner_or_capable(src_inode)) {
+ /*
+ * Subvolume creation is not restricted, but snapshots
+ * are limited to own subvolumes only
+ */
+ ret = -EPERM;
} else {
ret = btrfs_mksubvol(&file->f_path, name, namelen,
BTRFS_I(src_inode)->root,
u64 flags;
int ret = 0;
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
ret = mnt_want_write_file(file);
if (ret)
goto out;
goto out_drop_write;
}
- if (!inode_owner_or_capable(inode)) {
- ret = -EACCES;
- goto out_drop_write;
- }
-
down_write(&root->fs_info->subvol_sem);
/* nothing to do */
goto out_drop_sem;
root_flags = btrfs_root_flags(&root->root_item);
- if (flags & BTRFS_SUBVOL_RDONLY)
+ if (flags & BTRFS_SUBVOL_RDONLY) {
btrfs_set_root_flags(&root->root_item,
root_flags | BTRFS_ROOT_SUBVOL_RDONLY);
- else
- btrfs_set_root_flags(&root->root_item,
+ } else {
+ /*
+ * Block RO -> RW transition if this subvolume is involved in
+ * send
+ */
+ spin_lock(&root->root_item_lock);
+ if (root->send_in_progress == 0) {
+ btrfs_set_root_flags(&root->root_item,
root_flags & ~BTRFS_ROOT_SUBVOL_RDONLY);
+ spin_unlock(&root->root_item_lock);
+ } else {
+ spin_unlock(&root->root_item_lock);
+ btrfs_warn(root->fs_info,
+ "Attempt to set subvolume %llu read-write during send",
+ root->root_key.objectid);
+ ret = -EPERM;
+ goto out_drop_sem;
+ }
+ }
trans = btrfs_start_transaction(root, 1);
if (IS_ERR(trans)) {
key.offset = (u64)-1;
root = btrfs_read_fs_root_no_name(info, &key);
if (IS_ERR(root)) {
- printk(KERN_ERR "could not find root %llu\n",
+ printk(KERN_ERR "BTRFS: could not find root %llu\n",
sk->tree_id);
btrfs_free_path(path);
return -ENOENT;
key.offset = (u64)-1;
root = btrfs_read_fs_root_no_name(info, &key);
if (IS_ERR(root)) {
- printk(KERN_ERR "could not find root %llu\n", tree_id);
+ printk(KERN_ERR "BTRFS: could not find root %llu\n", tree_id);
ret = -ENOENT;
goto out;
}
#define BTRFS_MAX_DEDUPE_LEN (16 * 1024 * 1024)
static long btrfs_ioctl_file_extent_same(struct file *file,
- void __user *argp)
+ struct btrfs_ioctl_same_args __user *argp)
{
- struct btrfs_ioctl_same_args tmp;
struct btrfs_ioctl_same_args *same;
struct btrfs_ioctl_same_extent_info *info;
- struct inode *src = file->f_dentry->d_inode;
- struct file *dst_file = NULL;
- struct inode *dst;
+ struct inode *src = file_inode(file);
u64 off;
u64 len;
int i;
unsigned long size;
u64 bs = BTRFS_I(src)->root->fs_info->sb->s_blocksize;
bool is_admin = capable(CAP_SYS_ADMIN);
+ u16 count;
if (!(file->f_mode & FMODE_READ))
return -EINVAL;
if (ret)
return ret;
- if (copy_from_user(&tmp,
- (struct btrfs_ioctl_same_args __user *)argp,
- sizeof(tmp))) {
+ if (get_user(count, &argp->dest_count)) {
ret = -EFAULT;
goto out;
}
- size = sizeof(tmp) +
- tmp.dest_count * sizeof(struct btrfs_ioctl_same_extent_info);
+ size = offsetof(struct btrfs_ioctl_same_args __user, info[count]);
- same = memdup_user((struct btrfs_ioctl_same_args __user *)argp, size);
+ same = memdup_user(argp, size);
if (IS_ERR(same)) {
ret = PTR_ERR(same);
goto out;
/* pre-format output fields to sane values */
- for (i = 0; i < same->dest_count; i++) {
+ for (i = 0; i < count; i++) {
same->info[i].bytes_deduped = 0ULL;
same->info[i].status = 0;
}
- ret = 0;
- for (i = 0; i < same->dest_count; i++) {
- info = &same->info[i];
-
- dst_file = fget(info->fd);
- if (!dst_file) {
+ for (i = 0, info = same->info; i < count; i++, info++) {
+ struct inode *dst;
+ struct fd dst_file = fdget(info->fd);
+ if (!dst_file.file) {
info->status = -EBADF;
- goto next;
+ continue;
}
+ dst = file_inode(dst_file.file);
- if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) {
+ if (!(is_admin || (dst_file.file->f_mode & FMODE_WRITE))) {
info->status = -EINVAL;
- goto next;
- }
-
- info->status = -EXDEV;
- if (file->f_path.mnt != dst_file->f_path.mnt)
- goto next;
-
- dst = dst_file->f_dentry->d_inode;
- if (src->i_sb != dst->i_sb)
- goto next;
-
- if (S_ISDIR(dst->i_mode)) {
+ } else if (file->f_path.mnt != dst_file.file->f_path.mnt) {
+ info->status = -EXDEV;
+ } else if (S_ISDIR(dst->i_mode)) {
info->status = -EISDIR;
- goto next;
- }
-
- if (!S_ISREG(dst->i_mode)) {
+ } else if (!S_ISREG(dst->i_mode)) {
info->status = -EACCES;
- goto next;
+ } else {
+ info->status = btrfs_extent_same(src, off, len, dst,
+ info->logical_offset);
+ if (info->status == 0)
+ info->bytes_deduped += len;
}
-
- info->status = btrfs_extent_same(src, off, len, dst,
- info->logical_offset);
- if (info->status == 0)
- info->bytes_deduped += len;
-
-next:
- if (dst_file)
- fput(dst_file);
+ fdput(dst_file);
}
ret = copy_to_user(argp, same, size);
* note the key will change type as we walk through the
* tree.
*/
+ path->leave_spinning = 1;
ret = btrfs_search_slot(NULL, BTRFS_I(src)->root, &key, path,
0, 0);
if (ret < 0)
goto out;
nritems = btrfs_header_nritems(path->nodes[0]);
+process_slot:
if (path->slots[0] >= nritems) {
ret = btrfs_next_leaf(BTRFS_I(src)->root, path);
if (ret < 0)
u8 comp;
u64 endoff;
- size = btrfs_item_size_nr(leaf, slot);
- read_extent_buffer(leaf, buf,
- btrfs_item_ptr_offset(leaf, slot),
- size);
-
extent = btrfs_item_ptr(leaf, slot,
struct btrfs_file_extent_item);
comp = btrfs_file_extent_compression(leaf, extent);
datal = btrfs_file_extent_ram_bytes(leaf,
extent);
}
- btrfs_release_path(path);
if (key.offset + datal <= off ||
- key.offset >= off + len - 1)
- goto next;
+ key.offset >= off + len - 1) {
+ path->slots[0]++;
+ goto process_slot;
+ }
+
+ size = btrfs_item_size_nr(leaf, slot);
+ read_extent_buffer(leaf, buf,
+ btrfs_item_ptr_offset(leaf, slot),
+ size);
+
+ btrfs_release_path(path);
+ path->leave_spinning = 0;
memcpy(&new_key, &key, sizeof(new_key));
new_key.objectid = btrfs_ino(inode);
}
ret = btrfs_end_transaction(trans, root);
}
-next:
btrfs_release_path(path);
key.offset++;
}
unlock_extent(&BTRFS_I(src)->io_tree, off, off + len - 1);
out_unlock:
- mutex_unlock(&src->i_mutex);
- if (!same_inode)
- mutex_unlock(&inode->i_mutex);
+ if (!same_inode) {
+ if (inode < src) {
+ mutex_unlock(&src->i_mutex);
+ mutex_unlock(&inode->i_mutex);
+ } else {
+ mutex_unlock(&inode->i_mutex);
+ mutex_unlock(&src->i_mutex);
+ }
+ } else {
+ mutex_unlock(&src->i_mutex);
+ }
out_fput:
fdput(src_file);
out_drop_write:
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, "
- "this isn't going to work\n");
+ btrfs_err(new_root->fs_info, "Umm, you don't have the default dir"
+ "item, this isn't going to work");
ret = -ENOENT;
goto out;
}
int ret = 0;
int received_uuid_changed;
+ if (!inode_owner_or_capable(inode))
+ return -EPERM;
+
ret = mnt_want_write_file(file);
if (ret < 0)
return ret;
goto out;
}
- if (!inode_owner_or_capable(inode)) {
- ret = -EACCES;
- goto out;
- }
-
sa = memdup_user(arg, sizeof(*sa));
if (IS_ERR(sa)) {
ret = PTR_ERR(sa);
len = strnlen(label, BTRFS_LABEL_SIZE);
if (len == BTRFS_LABEL_SIZE) {
- pr_warn("btrfs: label is too long, return the first %zu bytes\n",
- --len);
+ btrfs_warn(root->fs_info,
+ "label is too long, return the first %zu bytes", --len);
}
ret = copy_to_user(arg, label, len);
return -EFAULT;
if (strnlen(label, BTRFS_LABEL_SIZE) == BTRFS_LABEL_SIZE) {
- pr_err("btrfs: unable to set label with more than %d bytes\n",
+ btrfs_err(root->fs_info, "unable to set label with more than %d bytes",
BTRFS_LABEL_SIZE - 1);
return -EINVAL;
}
spin_lock(&root->fs_info->super_lock);
strcpy(super_block->label, label);
spin_unlock(&root->fs_info->super_lock);
- ret = btrfs_end_transaction(trans, root);
+ ret = btrfs_commit_transaction(trans, root);
out_unlock:
mnt_drop_write_file(file);
return ret;
}
+#define INIT_FEATURE_FLAGS(suffix) \
+ { .compat_flags = BTRFS_FEATURE_COMPAT_##suffix, \
+ .compat_ro_flags = BTRFS_FEATURE_COMPAT_RO_##suffix, \
+ .incompat_flags = BTRFS_FEATURE_INCOMPAT_##suffix }
+
+static int btrfs_ioctl_get_supported_features(struct file *file,
+ void __user *arg)
+{
+ static struct btrfs_ioctl_feature_flags features[3] = {
+ INIT_FEATURE_FLAGS(SUPP),
+ INIT_FEATURE_FLAGS(SAFE_SET),
+ INIT_FEATURE_FLAGS(SAFE_CLEAR)
+ };
+
+ if (copy_to_user(arg, &features, sizeof(features)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int btrfs_ioctl_get_features(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
+ struct btrfs_super_block *super_block = root->fs_info->super_copy;
+ struct btrfs_ioctl_feature_flags features;
+
+ features.compat_flags = btrfs_super_compat_flags(super_block);
+ features.compat_ro_flags = btrfs_super_compat_ro_flags(super_block);
+ features.incompat_flags = btrfs_super_incompat_flags(super_block);
+
+ if (copy_to_user(arg, &features, sizeof(features)))
+ return -EFAULT;
+
+ return 0;
+}
+
+static int check_feature_bits(struct btrfs_root *root,
+ enum btrfs_feature_set set,
+ u64 change_mask, u64 flags, u64 supported_flags,
+ u64 safe_set, u64 safe_clear)
+{
+ const char *type = btrfs_feature_set_names[set];
+ char *names;
+ u64 disallowed, unsupported;
+ u64 set_mask = flags & change_mask;
+ u64 clear_mask = ~flags & change_mask;
+
+ unsupported = set_mask & ~supported_flags;
+ if (unsupported) {
+ names = btrfs_printable_features(set, unsupported);
+ if (names) {
+ btrfs_warn(root->fs_info,
+ "this kernel does not support the %s feature bit%s",
+ names, strchr(names, ',') ? "s" : "");
+ kfree(names);
+ } else
+ btrfs_warn(root->fs_info,
+ "this kernel does not support %s bits 0x%llx",
+ type, unsupported);
+ return -EOPNOTSUPP;
+ }
+
+ disallowed = set_mask & ~safe_set;
+ if (disallowed) {
+ names = btrfs_printable_features(set, disallowed);
+ if (names) {
+ btrfs_warn(root->fs_info,
+ "can't set the %s feature bit%s while mounted",
+ names, strchr(names, ',') ? "s" : "");
+ kfree(names);
+ } else
+ btrfs_warn(root->fs_info,
+ "can't set %s bits 0x%llx while mounted",
+ type, disallowed);
+ return -EPERM;
+ }
+
+ disallowed = clear_mask & ~safe_clear;
+ if (disallowed) {
+ names = btrfs_printable_features(set, disallowed);
+ if (names) {
+ btrfs_warn(root->fs_info,
+ "can't clear the %s feature bit%s while mounted",
+ names, strchr(names, ',') ? "s" : "");
+ kfree(names);
+ } else
+ btrfs_warn(root->fs_info,
+ "can't clear %s bits 0x%llx while mounted",
+ type, disallowed);
+ return -EPERM;
+ }
+
+ return 0;
+}
+
+#define check_feature(root, change_mask, flags, mask_base) \
+check_feature_bits(root, FEAT_##mask_base, change_mask, flags, \
+ BTRFS_FEATURE_ ## mask_base ## _SUPP, \
+ BTRFS_FEATURE_ ## mask_base ## _SAFE_SET, \
+ BTRFS_FEATURE_ ## mask_base ## _SAFE_CLEAR)
+
+static int btrfs_ioctl_set_features(struct file *file, void __user *arg)
+{
+ struct btrfs_root *root = BTRFS_I(file_inode(file))->root;
+ struct btrfs_super_block *super_block = root->fs_info->super_copy;
+ struct btrfs_ioctl_feature_flags flags[2];
+ struct btrfs_trans_handle *trans;
+ u64 newflags;
+ int ret;
+
+ if (!capable(CAP_SYS_ADMIN))
+ return -EPERM;
+
+ if (copy_from_user(flags, arg, sizeof(flags)))
+ return -EFAULT;
+
+ /* Nothing to do */
+ if (!flags[0].compat_flags && !flags[0].compat_ro_flags &&
+ !flags[0].incompat_flags)
+ return 0;
+
+ ret = check_feature(root, flags[0].compat_flags,
+ flags[1].compat_flags, COMPAT);
+ if (ret)
+ return ret;
+
+ ret = check_feature(root, flags[0].compat_ro_flags,
+ flags[1].compat_ro_flags, COMPAT_RO);
+ if (ret)
+ return ret;
+
+ ret = check_feature(root, flags[0].incompat_flags,
+ flags[1].incompat_flags, INCOMPAT);
+ if (ret)
+ return ret;
+
+ trans = btrfs_start_transaction(root, 0);
+ if (IS_ERR(trans))
+ return PTR_ERR(trans);
+
+ spin_lock(&root->fs_info->super_lock);
+ newflags = btrfs_super_compat_flags(super_block);
+ newflags |= flags[0].compat_flags & flags[1].compat_flags;
+ newflags &= ~(flags[0].compat_flags & ~flags[1].compat_flags);
+ btrfs_set_super_compat_flags(super_block, newflags);
+
+ newflags = btrfs_super_compat_ro_flags(super_block);
+ newflags |= flags[0].compat_ro_flags & flags[1].compat_ro_flags;
+ newflags &= ~(flags[0].compat_ro_flags & ~flags[1].compat_ro_flags);
+ btrfs_set_super_compat_ro_flags(super_block, newflags);
+
+ newflags = btrfs_super_incompat_flags(super_block);
+ newflags |= flags[0].incompat_flags & flags[1].incompat_flags;
+ newflags &= ~(flags[0].incompat_flags & ~flags[1].incompat_flags);
+ btrfs_set_super_incompat_flags(super_block, newflags);
+ spin_unlock(&root->fs_info->super_lock);
+
+ return btrfs_commit_transaction(trans, root);
+}
+
long btrfs_ioctl(struct file *file, unsigned int
cmd, unsigned long arg)
{
return btrfs_ioctl_set_fslabel(file, argp);
case BTRFS_IOC_FILE_EXTENT_SAME:
return btrfs_ioctl_file_extent_same(file, argp);
+ case BTRFS_IOC_GET_SUPPORTED_FEATURES:
+ return btrfs_ioctl_get_supported_features(file, argp);
+ case BTRFS_IOC_GET_FEATURES:
+ return btrfs_ioctl_get_features(file, argp);
+ case BTRFS_IOC_SET_FEATURES:
+ return btrfs_ioctl_set_features(file, argp);
}
return -ENOTTY;