diff options
Diffstat (limited to 'fs/btrfs/ioctl.c')
-rw-r--r-- | fs/btrfs/ioctl.c | 317 |
1 files changed, 236 insertions, 81 deletions
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c index 5b3429ab8ec1..4b4516770f05 100644 --- a/fs/btrfs/ioctl.c +++ b/fs/btrfs/ioctl.c @@ -55,6 +55,7 @@ #include "backref.h" #include "rcu-string.h" #include "send.h" +#include "dev-replace.h" /* Mask out flags that are inappropriate for the given type of inode. */ static inline __u32 btrfs_mask_flags(umode_t mode, __u32 flags) @@ -140,8 +141,11 @@ void btrfs_inherit_iflags(struct inode *inode, struct inode *dir) BTRFS_I(inode)->flags |= BTRFS_INODE_COMPRESS; } - if (flags & BTRFS_INODE_NODATACOW) + if (flags & BTRFS_INODE_NODATACOW) { BTRFS_I(inode)->flags |= BTRFS_INODE_NODATACOW; + if (S_ISREG(inode->i_mode)) + BTRFS_I(inode)->flags |= BTRFS_INODE_NODATASUM; + } btrfs_update_iflags(inode); } @@ -571,8 +575,12 @@ static int create_snapshot(struct btrfs_root *root, struct dentry *dentry, ret = btrfs_commit_transaction(trans, root->fs_info->extent_root); } - if (ret) + if (ret) { + /* cleanup_transaction has freed this for us */ + if (trans->aborted) + pending_snapshot = NULL; goto fail; + } ret = pending_snapshot->error; if (ret) @@ -705,6 +713,16 @@ static noinline int btrfs_mksubvol(struct path *parent, if (error) goto out_dput; + /* + * even if this name doesn't exist, we may get hash collisions. + * check for them now when we can safely fail + */ + error = btrfs_check_dir_item_collision(BTRFS_I(dir)->root, + dir->i_ino, name, + namelen); + if (error) + goto out_dput; + down_read(&BTRFS_I(dir)->root->fs_info->subvol_sem); if (btrfs_root_refs(&BTRFS_I(dir)->root->root_item) == 0) @@ -1293,12 +1311,13 @@ out_ra: return ret; } -static noinline int btrfs_ioctl_resize(struct btrfs_root *root, +static noinline int btrfs_ioctl_resize(struct file *file, void __user *arg) { u64 new_size; u64 old_size; u64 devid = 1; + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_vol_args *vol_args; struct btrfs_trans_handle *trans; struct btrfs_device *device = NULL; @@ -1313,13 +1332,17 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root, if (!capable(CAP_SYS_ADMIN)) return -EPERM; - mutex_lock(&root->fs_info->volume_mutex); - if (root->fs_info->balance_ctl) { - printk(KERN_INFO "btrfs: balance in progress\n"); - ret = -EINVAL; - goto out; + ret = mnt_want_write_file(file); + if (ret) + return ret; + + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); + return -EINPROGRESS; } + mutex_lock(&root->fs_info->volume_mutex); vol_args = memdup_user(arg, sizeof(*vol_args)); if (IS_ERR(vol_args)) { ret = PTR_ERR(vol_args); @@ -1339,7 +1362,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root, printk(KERN_INFO "btrfs: resizing devid %llu\n", (unsigned long long)devid); } - device = btrfs_find_device(root, devid, NULL, NULL); + device = btrfs_find_device(root->fs_info, devid, NULL, NULL); if (!device) { printk(KERN_INFO "btrfs: resizer unable to find device %llu\n", (unsigned long long)devid); @@ -1371,6 +1394,11 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root, } } + if (device->is_tgtdev_for_dev_replace) { + ret = -EINVAL; + goto out_free; + } + old_size = device->total_bytes; if (mod < 0) { @@ -1409,12 +1437,14 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root, btrfs_commit_transaction(trans, root); } else if (new_size < old_size) { ret = btrfs_shrink_device(device, new_size); - } + } /* equal, nothing need to do */ out_free: kfree(vol_args); out: mutex_unlock(&root->fs_info->volume_mutex); + mnt_drop_write_file(file); + atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); return ret; } @@ -2156,9 +2186,17 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp) if (btrfs_root_readonly(root)) return -EROFS; + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); + return -EINPROGRESS; + } ret = mnt_want_write_file(file); - if (ret) + if (ret) { + atomic_set(&root->fs_info->mutually_exclusive_operation_running, + 0); return ret; + } switch (inode->i_mode & S_IFMT) { case S_IFDIR: @@ -2210,6 +2248,7 @@ static int btrfs_ioctl_defrag(struct file *file, void __user *argp) } out: mnt_drop_write_file(file); + atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); return ret; } @@ -2221,13 +2260,13 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - mutex_lock(&root->fs_info->volume_mutex); - if (root->fs_info->balance_ctl) { - printk(KERN_INFO "btrfs: balance in progress\n"); - ret = -EINVAL; - goto out; + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); + return -EINPROGRESS; } + mutex_lock(&root->fs_info->volume_mutex); vol_args = memdup_user(arg, sizeof(*vol_args)); if (IS_ERR(vol_args)) { ret = PTR_ERR(vol_args); @@ -2240,27 +2279,31 @@ static long btrfs_ioctl_add_dev(struct btrfs_root *root, void __user *arg) kfree(vol_args); out: mutex_unlock(&root->fs_info->volume_mutex); + atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); return ret; } -static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_rm_dev(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_vol_args *vol_args; int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; - mutex_lock(&root->fs_info->volume_mutex); - if (root->fs_info->balance_ctl) { - printk(KERN_INFO "btrfs: balance in progress\n"); - ret = -EINVAL; - goto out; + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); + mnt_drop_write_file(file); + return -EINPROGRESS; } + mutex_lock(&root->fs_info->volume_mutex); vol_args = memdup_user(arg, sizeof(*vol_args)); if (IS_ERR(vol_args)) { ret = PTR_ERR(vol_args); @@ -2273,6 +2316,8 @@ static long btrfs_ioctl_rm_dev(struct btrfs_root *root, void __user *arg) kfree(vol_args); out: mutex_unlock(&root->fs_info->volume_mutex); + mnt_drop_write_file(file); + atomic_set(&root->fs_info->mutually_exclusive_operation_running, 0); return ret; } @@ -2328,7 +2373,7 @@ static long btrfs_ioctl_dev_info(struct btrfs_root *root, void __user *arg) s_uuid = di_args->uuid; mutex_lock(&fs_devices->device_list_mutex); - dev = btrfs_find_device(root, di_args->devid, s_uuid, NULL); + dev = btrfs_find_device(root->fs_info, di_args->devid, s_uuid, NULL); mutex_unlock(&fs_devices->device_list_mutex); if (!dev) { @@ -2821,12 +2866,19 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) struct btrfs_disk_key disk_key; u64 objectid = 0; u64 dir_id; + int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (copy_from_user(&objectid, argp, sizeof(objectid))) - return -EFAULT; + ret = mnt_want_write_file(file); + if (ret) + return ret; + + if (copy_from_user(&objectid, argp, sizeof(objectid))) { + ret = -EFAULT; + goto out; + } if (!objectid) objectid = root->root_key.objectid; @@ -2836,21 +2888,28 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) location.offset = (u64)-1; new_root = btrfs_read_fs_root_no_name(root->fs_info, &location); - if (IS_ERR(new_root)) - return PTR_ERR(new_root); + if (IS_ERR(new_root)) { + ret = PTR_ERR(new_root); + goto out; + } - if (btrfs_root_refs(&new_root->root_item) == 0) - return -ENOENT; + if (btrfs_root_refs(&new_root->root_item) == 0) { + ret = -ENOENT; + goto out; + } path = btrfs_alloc_path(); - if (!path) - return -ENOMEM; + if (!path) { + ret = -ENOMEM; + goto out; + } path->leave_spinning = 1; trans = btrfs_start_transaction(root, 1); if (IS_ERR(trans)) { btrfs_free_path(path); - return PTR_ERR(trans); + ret = PTR_ERR(trans); + goto out; } dir_id = btrfs_super_root_dir(root->fs_info->super_copy); @@ -2861,7 +2920,8 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) btrfs_end_transaction(trans, root); printk(KERN_ERR "Umm, you don't have the default dir item, " "this isn't going to work\n"); - return -ENOENT; + ret = -ENOENT; + goto out; } btrfs_cpu_key_to_disk(&disk_key, &new_root->root_key); @@ -2871,8 +2931,9 @@ static long btrfs_ioctl_default_subvol(struct file *file, void __user *argp) btrfs_set_fs_incompat(root->fs_info, DEFAULT_SUBVOL); btrfs_end_transaction(trans, root); - - return 0; +out: + mnt_drop_write_file(file); + return ret; } void btrfs_get_block_group_info(struct list_head *groups_list, @@ -3036,32 +3097,38 @@ long btrfs_ioctl_trans_end(struct file *file) return 0; } -static noinline long btrfs_ioctl_start_sync(struct file *file, void __user *argp) +static noinline long btrfs_ioctl_start_sync(struct btrfs_root *root, + void __user *argp) { - struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; struct btrfs_trans_handle *trans; u64 transid; int ret; - trans = btrfs_start_transaction(root, 0); - if (IS_ERR(trans)) - return PTR_ERR(trans); + trans = btrfs_attach_transaction(root); + if (IS_ERR(trans)) { + if (PTR_ERR(trans) != -ENOENT) + return PTR_ERR(trans); + + /* No running transaction, don't bother */ + transid = root->fs_info->last_trans_committed; + goto out; + } transid = trans->transid; ret = btrfs_commit_transaction_async(trans, root, 0); if (ret) { btrfs_end_transaction(trans, root); return ret; } - +out: if (argp) if (copy_to_user(argp, &transid, sizeof(transid))) return -EFAULT; return 0; } -static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) +static noinline long btrfs_ioctl_wait_sync(struct btrfs_root *root, + void __user *argp) { - struct btrfs_root *root = BTRFS_I(file->f_dentry->d_inode)->root; u64 transid; if (argp) { @@ -3073,10 +3140,11 @@ static noinline long btrfs_ioctl_wait_sync(struct file *file, void __user *argp) return btrfs_wait_for_commit(root, transid); } -static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_scrub(struct file *file, void __user *arg) { - int ret; + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_scrub_args *sa; + int ret; if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -3085,12 +3153,22 @@ static long btrfs_ioctl_scrub(struct btrfs_root *root, void __user *arg) if (IS_ERR(sa)) return PTR_ERR(sa); - ret = btrfs_scrub_dev(root, sa->devid, sa->start, sa->end, - &sa->progress, sa->flags & BTRFS_SCRUB_READONLY); + if (!(sa->flags & BTRFS_SCRUB_READONLY)) { + ret = mnt_want_write_file(file); + if (ret) + goto out; + } + + ret = btrfs_scrub_dev(root->fs_info, sa->devid, sa->start, sa->end, + &sa->progress, sa->flags & BTRFS_SCRUB_READONLY, + 0); if (copy_to_user(arg, sa, sizeof(*sa))) ret = -EFAULT; + if (!(sa->flags & BTRFS_SCRUB_READONLY)) + mnt_drop_write_file(file); +out: kfree(sa); return ret; } @@ -3100,7 +3178,7 @@ static long btrfs_ioctl_scrub_cancel(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - return btrfs_scrub_cancel(root); + return btrfs_scrub_cancel(root->fs_info); } static long btrfs_ioctl_scrub_progress(struct btrfs_root *root, @@ -3149,6 +3227,51 @@ static long btrfs_ioctl_get_dev_stats(struct btrfs_root *root, return ret; } +static long btrfs_ioctl_dev_replace(struct btrfs_root *root, void __user *arg) +{ + struct btrfs_ioctl_dev_replace_args *p; + int ret; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + p = memdup_user(arg, sizeof(*p)); + if (IS_ERR(p)) + return PTR_ERR(p); + + switch (p->cmd) { + case BTRFS_IOCTL_DEV_REPLACE_CMD_START: + if (atomic_xchg( + &root->fs_info->mutually_exclusive_operation_running, + 1)) { + pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); + ret = -EINPROGRESS; + } else { + ret = btrfs_dev_replace_start(root, p); + atomic_set( + &root->fs_info->mutually_exclusive_operation_running, + 0); + } + break; + case BTRFS_IOCTL_DEV_REPLACE_CMD_STATUS: + btrfs_dev_replace_status(root->fs_info, p); + ret = 0; + break; + case BTRFS_IOCTL_DEV_REPLACE_CMD_CANCEL: + ret = btrfs_dev_replace_cancel(root->fs_info, p); + break; + default: + ret = -EINVAL; + break; + } + + if (copy_to_user(arg, p, sizeof(*p))) + ret = -EFAULT; + + kfree(p); + return ret; +} + static long btrfs_ioctl_ino_to_path(struct btrfs_root *root, void __user *arg) { int ret = 0; @@ -3315,6 +3438,7 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg) struct btrfs_ioctl_balance_args *bargs; struct btrfs_balance_control *bctl; int ret; + int need_to_clear_lock = 0; if (!capable(CAP_SYS_ADMIN)) return -EPERM; @@ -3350,10 +3474,13 @@ static long btrfs_ioctl_balance(struct file *file, void __user *arg) bargs = NULL; } - if (fs_info->balance_ctl) { + if (atomic_xchg(&root->fs_info->mutually_exclusive_operation_running, + 1)) { + pr_info("btrfs: dev add/delete/balance/replace/resize operation in progress\n"); ret = -EINPROGRESS; goto out_bargs; } + need_to_clear_lock = 1; bctl = kzalloc(sizeof(*bctl), GFP_NOFS); if (!bctl) { @@ -3387,6 +3514,9 @@ do_balance: out_bargs: kfree(bargs); out: + if (need_to_clear_lock) + atomic_set(&root->fs_info->mutually_exclusive_operation_running, + 0); mutex_unlock(&fs_info->balance_mutex); mutex_unlock(&fs_info->volume_mutex); mnt_drop_write_file(file); @@ -3441,8 +3571,9 @@ out: return ret; } -static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_quota_ctl(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_quota_ctl_args *sa; struct btrfs_trans_handle *trans = NULL; int ret; @@ -3451,12 +3582,15 @@ static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } if (sa->cmd != BTRFS_QUOTA_CTL_RESCAN) { trans = btrfs_start_transaction(root, 2); @@ -3489,14 +3623,16 @@ static long btrfs_ioctl_quota_ctl(struct btrfs_root *root, void __user *arg) if (err && !ret) ret = err; } - out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } -static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_qgroup_assign(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_qgroup_assign_args *sa; struct btrfs_trans_handle *trans; int ret; @@ -3505,12 +3641,15 @@ static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } trans = btrfs_join_transaction(root); if (IS_ERR(trans)) { @@ -3533,11 +3672,14 @@ static long btrfs_ioctl_qgroup_assign(struct btrfs_root *root, void __user *arg) out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } -static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_qgroup_create(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_qgroup_create_args *sa; struct btrfs_trans_handle *trans; int ret; @@ -3546,12 +3688,15 @@ static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } trans = btrfs_join_transaction(root); if (IS_ERR(trans)) { @@ -3573,11 +3718,14 @@ static long btrfs_ioctl_qgroup_create(struct btrfs_root *root, void __user *arg) out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } -static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) +static long btrfs_ioctl_qgroup_limit(struct file *file, void __user *arg) { + struct btrfs_root *root = BTRFS_I(fdentry(file)->d_inode)->root; struct btrfs_ioctl_qgroup_limit_args *sa; struct btrfs_trans_handle *trans; int ret; @@ -3587,12 +3735,15 @@ static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) if (!capable(CAP_SYS_ADMIN)) return -EPERM; - if (root->fs_info->sb->s_flags & MS_RDONLY) - return -EROFS; + ret = mnt_want_write_file(file); + if (ret) + return ret; sa = memdup_user(arg, sizeof(*sa)); - if (IS_ERR(sa)) - return PTR_ERR(sa); + if (IS_ERR(sa)) { + ret = PTR_ERR(sa); + goto drop_write; + } trans = btrfs_join_transaction(root); if (IS_ERR(trans)) { @@ -3615,6 +3766,8 @@ static long btrfs_ioctl_qgroup_limit(struct btrfs_root *root, void __user *arg) out: kfree(sa); +drop_write: + mnt_drop_write_file(file); return ret; } @@ -3735,11 +3888,11 @@ long btrfs_ioctl(struct file *file, unsigned int case BTRFS_IOC_DEFRAG_RANGE: return btrfs_ioctl_defrag(file, argp); case BTRFS_IOC_RESIZE: - return btrfs_ioctl_resize(root, argp); + return btrfs_ioctl_resize(file, argp); case BTRFS_IOC_ADD_DEV: return btrfs_ioctl_add_dev(root, argp); case BTRFS_IOC_RM_DEV: - return btrfs_ioctl_rm_dev(root, argp); + return btrfs_ioctl_rm_dev(file, argp); case BTRFS_IOC_FS_INFO: return btrfs_ioctl_fs_info(root, argp); case BTRFS_IOC_DEV_INFO: @@ -3768,11 +3921,11 @@ long btrfs_ioctl(struct file *file, unsigned int btrfs_sync_fs(file->f_dentry->d_sb, 1); return 0; case BTRFS_IOC_START_SYNC: - return btrfs_ioctl_start_sync(file, argp); + return btrfs_ioctl_start_sync(root, argp); case BTRFS_IOC_WAIT_SYNC: - return btrfs_ioctl_wait_sync(file, argp); + return btrfs_ioctl_wait_sync(root, argp); case BTRFS_IOC_SCRUB: - return btrfs_ioctl_scrub(root, argp); + return btrfs_ioctl_scrub(file, argp); case BTRFS_IOC_SCRUB_CANCEL: return btrfs_ioctl_scrub_cancel(root, argp); case BTRFS_IOC_SCRUB_PROGRESS: @@ -3790,13 +3943,15 @@ long btrfs_ioctl(struct file *file, unsigned int case BTRFS_IOC_GET_DEV_STATS: return btrfs_ioctl_get_dev_stats(root, argp); case BTRFS_IOC_QUOTA_CTL: - return btrfs_ioctl_quota_ctl(root, argp); + return btrfs_ioctl_quota_ctl(file, argp); case BTRFS_IOC_QGROUP_ASSIGN: - return btrfs_ioctl_qgroup_assign(root, argp); + return btrfs_ioctl_qgroup_assign(file, argp); case BTRFS_IOC_QGROUP_CREATE: - return btrfs_ioctl_qgroup_create(root, argp); + return btrfs_ioctl_qgroup_create(file, argp); case BTRFS_IOC_QGROUP_LIMIT: - return btrfs_ioctl_qgroup_limit(root, argp); + return btrfs_ioctl_qgroup_limit(file, argp); + case BTRFS_IOC_DEV_REPLACE: + return btrfs_ioctl_dev_replace(root, argp); } return -ENOTTY; |