On 29.11.2017 06:45, Anand Jain wrote:
> Currently device state is being managed by each individual int
> variable such as struct btrfs_device::missing. Instead of that
> declare btrfs_device::dev_state BTRFS_DEV_STATE_MISSING and use
> the bit operations.
>
> Signed-off-by: Anand Jain <anand.j...@oracle.com>
Reviewed-by : Nikolay Borisov <nbori...@suse.com>
> ---
> fs/btrfs/dev-replace.c | 3 ++-
> fs/btrfs/disk-io.c | 4 ++--
> fs/btrfs/scrub.c | 7 ++++---
> fs/btrfs/super.c | 2 +-
> fs/btrfs/volumes.c | 33 +++++++++++++++++++--------------
> fs/btrfs/volumes.h | 2 +-
> 6 files changed, 29 insertions(+), 22 deletions(-)
>
> diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
> index 4b6ceb38cb5f..559db7667f38 100644
> --- a/fs/btrfs/dev-replace.c
> +++ b/fs/btrfs/dev-replace.c
> @@ -306,7 +306,8 @@ void btrfs_after_dev_replace_commit(struct btrfs_fs_info
> *fs_info)
>
> static inline char *dev_missing_or_rcu_str(struct btrfs_device *device)
> {
> - return device->missing ? "<missing disk>" : rcu_str_deref(device->name);
> + return test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state) ?
> + "<missing disk>" : rcu_str_deref(device->name);
> }
>
> int btrfs_dev_replace_start(struct btrfs_fs_info *fs_info,
> diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
> index ab1a514e5c8d..ac1079fc9382 100644
> --- a/fs/btrfs/disk-io.c
> +++ b/fs/btrfs/disk-io.c
> @@ -3559,7 +3559,7 @@ static int barrier_all_devices(struct btrfs_fs_info
> *info)
> /* send down all the barriers */
> head = &info->fs_devices->devices;
> list_for_each_entry_rcu(dev, head, dev_list) {
> - if (dev->missing)
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
> continue;
> if (!dev->bdev)
> continue;
> @@ -3575,7 +3575,7 @@ static int barrier_all_devices(struct btrfs_fs_info
> *info)
>
> /* wait for all the barriers */
> list_for_each_entry_rcu(dev, head, dev_list) {
> - if (dev->missing)
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
> continue;
> if (!dev->bdev) {
> errors_wait++;
> diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
> index 060fa93731e5..666c00cbee03 100644
> --- a/fs/btrfs/scrub.c
> +++ b/fs/btrfs/scrub.c
> @@ -2535,7 +2535,7 @@ static int scrub_pages(struct scrub_ctx *sctx, u64
> logical, u64 len,
> }
>
> WARN_ON(sblock->page_count == 0);
> - if (dev->missing) {
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) {
> /*
> * This case should only be hit for RAID 5/6 device replace. See
> * the comment in scrub_missing_raid56_pages() for details.
> @@ -2870,7 +2870,7 @@ static int scrub_extent_for_parity(struct scrub_parity
> *sparity,
> u8 csum[BTRFS_CSUM_SIZE];
> u32 blocksize;
>
> - if (dev->missing) {
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state)) {
> scrub_parity_mark_sectors_error(sparity, logical, len);
> return 0;
> }
> @@ -4112,7 +4112,8 @@ int btrfs_scrub_dev(struct btrfs_fs_info *fs_info, u64
> devid, u64 start,
>
> mutex_lock(&fs_info->fs_devices->device_list_mutex);
> dev = btrfs_find_device(fs_info, devid, NULL, NULL);
> - if (!dev || (dev->missing && !is_dev_replace)) {
> + if (!dev || (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state) &&
> + !is_dev_replace)) {
> mutex_unlock(&fs_info->fs_devices->device_list_mutex);
> return -ENODEV;
> }
> diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
> index 9089aad2f3aa..4b70ae6f0245 100644
> --- a/fs/btrfs/super.c
> +++ b/fs/btrfs/super.c
> @@ -2243,7 +2243,7 @@ static int btrfs_show_devname(struct seq_file *m,
> struct dentry *root)
> while (cur_devices) {
> head = &cur_devices->devices;
> list_for_each_entry(dev, head, dev_list) {
> - if (dev->missing)
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &dev->dev_state))
> continue;
> if (!dev->name)
> continue;
> diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
> index 13a6ae80bee1..75839e07ce10 100644
> --- a/fs/btrfs/volumes.c
> +++ b/fs/btrfs/volumes.c
> @@ -773,9 +773,9 @@ static noinline int device_list_add(const char *path,
> return -ENOMEM;
> rcu_string_free(device->name);
> rcu_assign_pointer(device->name, name);
> - if (device->missing) {
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) {
> fs_devices->missing_devices--;
> - device->missing = 0;
> + clear_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
> }
> }
>
> @@ -957,7 +957,7 @@ static void btrfs_prepare_close_one_device(struct
> btrfs_device *device)
> fs_devices->rw_devices--;
> }
>
> - if (device->missing)
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
> fs_devices->missing_devices--;
>
> new_device = btrfs_alloc_device(NULL, &device->devid,
> @@ -1844,7 +1844,8 @@ struct btrfs_device
> *btrfs_find_next_active_device(struct btrfs_fs_devices *fs_d
>
> list_for_each_entry(next_device, &fs_devs->devices, dev_list) {
> if (next_device != device &&
> - !next_device->missing && next_device->bdev)
> + !test_bit(BTRFS_DEV_STATE_MISSING,
> + &next_device->dev_state) && next_device->bdev)
> return next_device;
> }
>
> @@ -1957,7 +1958,7 @@ int btrfs_rm_device(struct btrfs_fs_info *fs_info,
> const char *device_path,
> device->fs_devices->num_devices--;
> device->fs_devices->total_devices--;
>
> - if (device->missing)
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state))
> device->fs_devices->missing_devices--;
>
> btrfs_assign_next_active_device(fs_info, device, NULL);
> @@ -2031,7 +2032,7 @@ void btrfs_rm_dev_replace_remove_srcdev(struct
> btrfs_fs_info *fs_info,
> list_del_rcu(&srcdev->dev_list);
> list_del_rcu(&srcdev->dev_alloc_list);
> fs_devices->num_devices--;
> - if (srcdev->missing)
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &srcdev->dev_state))
> fs_devices->missing_devices--;
>
> if (test_bit(BTRFS_DEV_STATE_WRITEABLE, &srcdev->dev_state))
> @@ -5048,7 +5049,7 @@ int btrfs_chunk_readonly(struct btrfs_fs_info *fs_info,
> u64 chunk_offset)
> for (i = 0; i < map->num_stripes; i++) {
> struct btrfs_device *device = map->stripes[i].dev;
>
> - if (device->missing) {
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state)) {
> miss_ndevs++;
> continue;
> }
> @@ -6079,7 +6080,8 @@ static noinline void btrfs_schedule_bio(struct
> btrfs_device *device,
> int should_queue = 1;
> struct btrfs_pending_bios *pending_bios;
>
> - if (device->missing || !device->bdev) {
> + if (test_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state) ||
> + !device->bdev) {
> bio_io_error(bio);
> return;
> }
> @@ -6282,7 +6284,7 @@ static struct btrfs_device *add_missing_dev(struct
> btrfs_fs_devices *fs_devices,
> device->fs_devices = fs_devices;
> fs_devices->num_devices++;
>
> - device->missing = 1;
> + set_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
> fs_devices->missing_devices++;
>
> return device;
> @@ -6644,7 +6646,8 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
> dev_uuid, false);
> }
>
> - if(!device->bdev && !device->missing) {
> + if (!device->bdev && !test_bit(BTRFS_DEV_STATE_MISSING,
> + &device->dev_state)) {
> /*
> * this happens when a device that was properly setup
> * in the device info lists suddenly goes bad.
> @@ -6652,12 +6655,13 @@ static int read_one_dev(struct btrfs_fs_info *fs_info,
> * device->missing to one here
> */
> device->fs_devices->missing_devices++;
> - device->missing = 1;
> + set_bit(BTRFS_DEV_STATE_MISSING, &device->dev_state);
> }
>
> /* Move the device to its own fs_devices */
> if (device->fs_devices != fs_devices) {
> - ASSERT(device->missing);
> + ASSERT(test_bit(BTRFS_DEV_STATE_MISSING,
> + &device->dev_state));
>
> list_move(&device->dev_list, &fs_devices->devices);
> device->fs_devices->num_devices--;
> @@ -6843,8 +6847,9 @@ bool btrfs_check_rw_degradable(struct btrfs_fs_info
> *fs_info)
> for (i = 0; i < map->num_stripes; i++) {
> struct btrfs_device *dev = map->stripes[i].dev;
>
> - if (!dev || !dev->bdev || dev->missing ||
> - dev->last_flush_error)
> + if (!dev || !dev->bdev ||
> + test_bit(BTRFS_DEV_STATE_MISSING,
> + &dev->dev_state) || dev->last_flush_error)
> missing++;
> }
> if (missing > max_tolerated) {
> diff --git a/fs/btrfs/volumes.h b/fs/btrfs/volumes.h
> index f73b78f26a61..2fbff6902c8d 100644
> --- a/fs/btrfs/volumes.h
> +++ b/fs/btrfs/volumes.h
> @@ -49,6 +49,7 @@ struct btrfs_pending_bios {
>
> #define BTRFS_DEV_STATE_WRITEABLE (1UL << 1)
> #define BTRFS_DEV_STATE_IN_FS_METADATA (1UL << 2)
> +#define BTRFS_DEV_STATE_MISSING (1UL << 3)
>
> struct btrfs_device {
> struct list_head dev_list;
> @@ -73,7 +74,6 @@ struct btrfs_device {
> fmode_t mode;
>
> unsigned long dev_state;
> - int missing;
> int can_discard;
> int is_tgtdev_for_dev_replace;
> blk_status_t last_flush_error;
>
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