From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.cn.fujitsu.com ([183.91.158.132]:3724 "EHLO heian.cn.fujitsu.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727594AbeGPJmL (ORCPT ); Mon, 16 Jul 2018 05:42:11 -0400 From: Gu Jinxiang To: CC: Subject: [PATCH v5 2/2] btrfs: get device pointer from btrfs_scan_one_device Date: Mon, 16 Jul 2018 17:11:17 +0800 Message-ID: <1531732277-23517-2-git-send-email-gujx@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-btrfs-owner@vger.kernel.org List-ID: In-Reply-To: <1531733656-23806-1-git-send-email-gujx@cn.fujitsu.com> Instead of pointer to btrfs_fs_devices as an arg in btrfs_scan_one_device, better to make it as a return value. And since btrfs_fs_devices can be get by btrfs_device, better to return btrfs_device than fs_btrfs_devices. Signed-off-by: Gu Jinxiang --- Changelog: v5: rebase to misc-next. v4: as suggested by Anand, change return value of btrfs_scan_one_device from btrfs_fs_devices to btrfs_device. v3: as comment by robot, use PTR_ERR_OR_ZERO, and rebase to misc-next. v2: as comment by Nikolay, use ERR_CAST instead of cast type manually. fs/btrfs/super.c | 35 ++++++++++++++++++++++------------- fs/btrfs/volumes.c | 22 ++++++++-------------- fs/btrfs/volumes.h | 4 ++-- 3 files changed, 32 insertions(+), 29 deletions(-) diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c index dcab4a0244e5..413bbe2d6db2 100644 --- a/fs/btrfs/super.c +++ b/fs/btrfs/super.c @@ -888,7 +888,7 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, { substring_t args[MAX_OPT_ARGS]; char *device_name, *opts, *orig, *p; - struct btrfs_fs_devices *fs_devices = NULL; + struct btrfs_device *device = NULL; int error = 0; lockdep_assert_held(&uuid_mutex); @@ -918,11 +918,13 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags, error = -ENOMEM; goto out; } - error = btrfs_scan_one_device(device_name, flags, - holder, &fs_devices); + device = btrfs_scan_one_device(device_name, flags, + holder); kfree(device_name); - if (error) + if (IS_ERR(device)) { + error = PTR_ERR(device); goto out; + } } } @@ -1518,6 +1520,7 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, { struct block_device *bdev = NULL; struct super_block *s; + struct btrfs_device *device = NULL; struct btrfs_fs_devices *fs_devices = NULL; struct btrfs_fs_info *fs_info = NULL; struct security_mnt_opts new_sec_opts; @@ -1561,12 +1564,15 @@ static struct dentry *btrfs_mount_root(struct file_system_type *fs_type, goto error_fs_info; } - error = btrfs_scan_one_device(device_name, mode, fs_type, &fs_devices); - if (error) { + device = btrfs_scan_one_device(device_name, mode, fs_type); + if (IS_ERR(device)) { + error = PTR_ERR(device); mutex_unlock(&uuid_mutex); goto error_fs_info; } + fs_devices = device->fs_devices; + fs_info->fs_devices = fs_devices; error = btrfs_open_devices(fs_devices, mode, fs_type); @@ -2227,7 +2233,7 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, unsigned long arg) { struct btrfs_ioctl_vol_args *vol; - struct btrfs_fs_devices *fs_devices; + struct btrfs_device *device = NULL; int ret = -ENOTTY; if (!capable(CAP_SYS_ADMIN)) @@ -2240,19 +2246,22 @@ static long btrfs_control_ioctl(struct file *file, unsigned int cmd, switch (cmd) { case BTRFS_IOC_SCAN_DEV: mutex_lock(&uuid_mutex); - ret = btrfs_scan_one_device(vol->name, FMODE_READ, - &btrfs_root_fs_type, &fs_devices); + device = btrfs_scan_one_device(vol->name, FMODE_READ, + &btrfs_root_fs_type); + ret = PTR_ERR_OR_ZERO(device); mutex_unlock(&uuid_mutex); break; case BTRFS_IOC_DEVICES_READY: mutex_lock(&uuid_mutex); - ret = btrfs_scan_one_device(vol->name, FMODE_READ, - &btrfs_root_fs_type, &fs_devices); - if (ret) { + device = btrfs_scan_one_device(vol->name, FMODE_READ, + &btrfs_root_fs_type); + if (IS_ERR(device)) { + ret = PTR_ERR(device); mutex_unlock(&uuid_mutex); break; } - ret = !(fs_devices->num_devices == fs_devices->total_devices); + ret = !(device->fs_devices->num_devices == + device->fs_devices->total_devices); mutex_unlock(&uuid_mutex); break; case BTRFS_IOC_GET_SUPPORTED_FEATURES: diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c index 88d37bfa99c8..9f485696461b 100644 --- a/fs/btrfs/volumes.c +++ b/fs/btrfs/volumes.c @@ -1213,15 +1213,14 @@ static int btrfs_read_disk_super(struct block_device *bdev, u64 bytenr, * and we are not allowed to call set_blocksize during the scan. The superblock * is read via pagecache */ -int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, - struct btrfs_fs_devices **fs_devices_ret) +struct btrfs_device *btrfs_scan_one_device(const char *path, fmode_t flags, + void *holder) { struct btrfs_super_block *disk_super; bool new_device_added = false; - struct btrfs_device *device; + struct btrfs_device *ret = NULL; struct block_device *bdev; struct page *page; - int ret = 0; u64 bytenr; lockdep_assert_held(&uuid_mutex); @@ -1237,21 +1236,16 @@ int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, bdev = blkdev_get_by_path(path, flags, holder); if (IS_ERR(bdev)) - return PTR_ERR(bdev); + return ERR_CAST(bdev); if (btrfs_read_disk_super(bdev, bytenr, &page, &disk_super)) { - ret = -EINVAL; + ret = ERR_PTR(-EINVAL); goto error_bdev_put; } - device = device_list_add(path, disk_super, &new_device_added); - if (IS_ERR(device)) { - ret = PTR_ERR(device); - } else { - *fs_devices_ret = device->fs_devices; - if (new_device_added) - btrfs_free_stale_devices(path, device); - } + ret = device_list_add(path, disk_super, &new_device_added); + if (new_device_added) + btrfs_free_stale_devices(path, ret); btrfs_release_disk_super(page); diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h index 9665b84b1026..06d8bb7dd557 100644 --- a/fs/btrfs/volumes.h +++ b/fs/btrfs/volumes.h @@ -403,8 +403,8 @@ blk_status_t btrfs_map_bio(struct btrfs_fs_info *fs_info, struct bio *bio, int mirror_num, int async_submit); int btrfs_open_devices(struct btrfs_fs_devices *fs_devices, fmode_t flags, void *holder); -int btrfs_scan_one_device(const char *path, fmode_t flags, void *holder, - struct btrfs_fs_devices **fs_devices_ret); +struct btrfs_device *btrfs_scan_one_device(const char *path, + fmode_t flags, void *holder); int btrfs_close_devices(struct btrfs_fs_devices *fs_devices); void btrfs_free_extra_devids(struct btrfs_fs_devices *fs_devices, int step); void btrfs_assign_next_active_device(struct btrfs_fs_info *fs_info, -- 2.17.1