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/linux/block/
H A Dgenhd.c59 void set_capacity(struct gendisk *disk, sector_t sectors) in set_capacity() argument
63 disk->disk_name, sectors, in set_capacity()
68 bdev_set_nr_sectors(disk->part0, sectors); in set_capacity()
73 * Set disk capacity and notify if the size is not currently zero and will not
76 bool set_capacity_and_notify(struct gendisk *disk, sector_t size) in set_capacity_and_notify() argument
78 sector_t capacity = get_capacity(disk); in set_capacity_and_notify()
81 set_capacity(disk, size); in set_capacity_and_notify()
89 !disk_live(disk) || in set_capacity_and_notify()
90 (disk->flags & GENHD_FL_HIDDEN)) in set_capacity_and_notify()
94 disk->disk_name, capacity, size); in set_capacity_and_notify()
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H A Dblk-zoned.c45 * @entry: list_head structure for listing the plug in the disk list of active
50 * @disk: The gendisk the plug belongs to.
53 * always at least 1 when the plug is hashed in the disk plug hash table.
73 struct gendisk *disk; member
82 static inline bool disk_need_zone_resources(struct gendisk *disk) in disk_need_zone_resources() argument
91 return queue_is_mq(disk->queue) || in disk_need_zone_resources()
92 queue_emulates_zone_append(disk->queue); in disk_need_zone_resources()
95 static inline unsigned int disk_zone_wplugs_hash_size(struct gendisk *disk) in disk_zone_wplugs_hash_size() argument
97 return 1U << disk->zone_wplugs_hash_bits; in disk_zone_wplugs_hash_size()
108 * removed from the disk hash table of zone write plugs when the last
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H A Dholder.c14 struct gendisk *disk) in bd_find_holder_disk() argument
18 list_for_each_entry(holder, &disk->slave_bdevs, list) in bd_find_holder_disk()
35 * bd_link_disk_holder - create symlinks between holding disk and slave bdev
37 * @disk: the holding disk
43 * - from "slaves" directory of the holder @disk to the claimed @bdev
44 * - from "holders" directory of the @bdev to the holder @disk
46 * For example, if /dev/dm-0 maps to /dev/sda and disk for dm-0 is
53 * ensure that both @bdev and @disk are valid during the creation and
62 int bd_link_disk_holder(struct block_device *bdev, struct gendisk *disk) in bd_link_disk_holder() argument
67 if (WARN_ON_ONCE(!disk->slave_dir)) in bd_link_disk_holder()
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H A Derror-injection.c27 struct gendisk *disk = bio->bi_bdev->bd_disk; in __blk_error_inject() local
31 list_for_each_entry_rcu(inj, &disk->error_injection_list, entry) { in __blk_error_inject()
49 disk->part0, blk_status_to_str(inj->status), in __blk_error_inject()
61 static int error_inject_add(struct gendisk *disk, enum req_op op, in error_inject_add() argument
91 disk->part0, blk_status_to_str(status), in error_inject_add()
100 mutex_lock(&disk->error_injection_lock); in error_inject_add()
101 if (!disk_live(disk)) { in error_inject_add()
102 mutex_unlock(&disk->error_injection_lock); in error_inject_add()
106 if (list_empty(&disk->error_injection_list)) in error_inject_add()
108 list_add_rcu(&inj->entry, &disk->error_injection_list); in error_inject_add()
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H A Dblk-wbt.h7 void wbt_init_enable_default(struct gendisk *disk);
8 void wbt_disable_default(struct gendisk *disk);
9 void wbt_enable_default(struct gendisk *disk);
13 int wbt_set_lat(struct gendisk *disk, s64 val);
17 static inline void wbt_init_enable_default(struct gendisk *disk) in wbt_init_enable_default() argument
21 static inline void wbt_disable_default(struct gendisk *disk) in wbt_disable_default() argument
24 static inline void wbt_enable_default(struct gendisk *disk) in wbt_enable_default() argument
H A Dblk-wbt.c96 static int wbt_init(struct gendisk *disk, struct rq_wb *rwb);
170 struct backing_dev_info *bdi = rwb->rqos.disk->bdi; in wb_recent_wait()
212 else if (blk_queue_write_cache(rwb->rqos.disk->queue) && in wbt_rqw_done()
309 struct backing_dev_info *bdi = rwb->rqos.disk->bdi; in latency_exceeded()
362 struct backing_dev_info *bdi = rwb->rqos.disk->bdi; in rwb_trace_step()
432 if (!rwb->rqos.disk) in wb_timer_fn()
437 trace_wbt_timer(rwb->rqos.disk->bdi, status, rqd->scale_step, inflight); in wb_timer_fn()
739 static bool __wbt_enable_default(struct gendisk *disk) in __wbt_enable_default() argument
741 struct request_queue *q = disk->queue; in __wbt_enable_default()
745 mutex_lock(&disk->rqos_state_mutex); in __wbt_enable_default()
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/linux/Documentation/admin-guide/blockdev/
H A Dramdisk.rst2 Using the RAM disk block device with Linux
10 4) An Example of Creating a Compressed RAM Disk
16 The RAM disk driver is a way to use main system memory as a block device. It
22 The RAM disk dynamically grows as more space is required. It does this by using
26 The RAM disk supports up to 16 RAM disks by default, and can be reconfigured
31 To use RAM disk support with your system, run './MAKEDEV ram' from the /dev
35 The new RAM disk also has the ability to load compressed RAM disk images,
37 rescue floppy disk.
48 This parameter tells the RAM disk driver to set up RAM disks of N k size. The
80 If you make a boot disk that has LILO, then for the above, you would use::
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/linux/Documentation/driver-api/md/
H A Draid5-cache.rst5 Raid 4/5/6 could include an extra disk for data cache besides normal RAID
6 disks. The role of RAID disks isn't changed with the cache disk. The cache disk
19 In both modes, all writes to the array will hit cache disk first. This means
20 the cache disk must be fast and sustainable.
34 The write-through cache will cache all data on cache disk first. After the data
35 is safe on the cache disk, the data will be flushed onto RAID disks. The
40 filesystems) after the data is safe on RAID disks, so cache disk failure
41 doesn't cause data loss. Of course cache disk failure means the array is
44 In write-through mode, the cache disk isn't required to be big. Several
51 cached on cache disk. But the main goal of 'write-back' cache is to speed up
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/linux/Documentation/power/
H A Dswsusp.rst11 If you touch anything on disk between suspend and resume...
20 problems. If your disk driver does not support suspend... (IDE does),
45 echo shutdown > /sys/power/disk; echo disk > /sys/power/state
49 echo platform > /sys/power/disk; echo disk > /sys/power/state
54 echo suspend > /sys/power/disk; echo disk > /sys/power/state
57 support. For suspend and resume to work, make sure your disk drivers
59 suspend/resume with modular disk drivers, see FAQ, but you probably
123 echo 4 > /proc/acpi/sleep # for suspend to disk
128 echo 4b > /proc/acpi/sleep # for suspend to disk via s4bios
139 bringing machine down? Suspend to disk, rearrange power cables,
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/linux/drivers/nvme/host/
H A Dmultipath.c123 if (h->disk) in nvme_mpath_unfreeze()
124 blk_mq_unfreeze_queue_nomemrestore(h->disk->queue); in nvme_mpath_unfreeze()
133 if (h->disk) in nvme_mpath_wait_freeze()
134 blk_mq_freeze_queue_wait(h->disk->queue); in nvme_mpath_wait_freeze()
143 if (h->disk) in nvme_mpath_start_freeze()
144 blk_freeze_queue_start(h->disk->queue); in nvme_mpath_start_freeze()
169 bio_set_dev(bio, ns->head->disk->part0); in nvme_failover_req()
181 struct gendisk *disk = ns->head->disk; in nvme_mpath_start_request() local
189 if (!blk_queue_io_stat(disk->queue) || in nvme_mpath_start_request()
193 !blk_rq_passthrough_stats(rq, disk->queue)) in nvme_mpath_start_request()
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H A Dtrace.h38 static inline void __assign_disk_name(char *name, struct gendisk *disk) in __assign_disk_name() argument
40 if (disk) in __assign_disk_name()
41 memcpy(name, disk->disk_name, DISK_NAME_LEN); in __assign_disk_name()
51 __array(char, disk, DISK_NAME_LEN)
71 __assign_disk_name(__entry->disk, req->q->disk);
76 __entry->ctrl_id, __print_disk_name(__entry->disk),
89 __array(char, disk, DISK_NAME_LEN)
106 __assign_disk_name(__entry->disk, req->q->disk);
109 __entry->ctrl_id, __print_disk_name(__entry->disk),
146 __array(char, disk, DISK_NAME_LEN)
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/linux/Documentation/ABI/testing/
H A Dsysfs-fs-ext41 What: /sys/fs/ext4/<disk>/mb_stats
10 What: /sys/fs/ext4/<disk>/mb_group_prealloc
18 What: /sys/fs/ext4/<disk>/mb_max_to_scan
25 What: /sys/fs/ext4/<disk>/mb_min_to_scan
32 What: /sys/fs/ext4/<disk>/mb_order2_req
40 What: /sys/fs/ext4/<disk>/mb_stream_req
51 What: /sys/fs/ext4/<disk>/inode_readahead_blks
59 What: /sys/fs/ext4/<disk>/delayed_allocation_blocks
67 What: /sys/fs/ext4/<disk>/lifetime_write_kbytes
75 What: /sys/fs/ext4/<disk>/session_write_kbytes
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/linux/include/linux/
H A Dblkdev.h238 * disk_openers - returns how many openers are there for a disk
239 * @disk: disk to check
241 * This returns the number of openers for a disk. Note that this value is only
242 * stable if disk->open_mutex is held.
247 static inline unsigned int disk_openers(struct gendisk *disk) in disk_openers() argument
249 return atomic_read(&disk->part0->bd_openers); in disk_openers()
253 * disk_has_partscan - return %true if partition scanning is enabled on a disk
254 * @disk: disk to check
256 * Returns %true if partitions scanning is enabled for @disk, or %false if
259 static inline bool disk_has_partscan(struct gendisk *disk) in disk_has_partscan() argument
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/linux/drivers/block/
H A Dataflop.c12 * - Disk change detection and drive deselecting after motor-off
14 * - Autodetection of disk format (DD/HD); untested yet, because I
33 * the FDC will otherwise wait forever when no disk is inserted...
37 * - more/other disk formats
42 * - Make disk format numbering independent from minors
48 * - disk formatting
61 * - Maybe a better strategy for disk change detection (does anyone
168 /* Disk types: DD, HD, ED */
179 { "D820", 10,1640, 0, 0}, /* 3: DD disk with 82 tracks/10 sectors */
227 /* Array for translating minors into disk formats */
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H A Dz2ram.c3 ** as a block device, to be used as a RAM disk or swap space
143 static int z2_open(struct gendisk *disk, blk_mode_t mode) in z2_open() argument
145 int device = disk->first_minor; in z2_open()
290 static void z2_release(struct gendisk *disk) in z2_release() argument
317 struct gendisk *disk; in z2ram_register_disk() local
320 disk = blk_mq_alloc_disk(&tag_set, NULL, NULL); in z2ram_register_disk()
321 if (IS_ERR(disk)) in z2ram_register_disk()
322 return PTR_ERR(disk); in z2ram_register_disk()
324 disk->major = Z2RAM_MAJOR; in z2ram_register_disk()
325 disk->first_minor = minor; in z2ram_register_disk()
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H A Dswim.c190 struct gendisk *disk; member
611 static int floppy_open(struct gendisk *disk, blk_mode_t mode) in floppy_open() argument
613 struct floppy_state *fs = disk->private_data; in floppy_open()
635 set_capacity(fs->disk, fs->total_secs); in floppy_open()
641 if (disk_check_media_change(disk) && fs->disk_in) in floppy_open()
660 static int floppy_unlocked_open(struct gendisk *disk, blk_mode_t mode) in floppy_unlocked_open() argument
665 ret = floppy_open(disk, mode); in floppy_unlocked_open()
671 static void floppy_release(struct gendisk *disk) in floppy_release() argument
673 struct floppy_state *fs = disk->private_data; in floppy_release()
714 static int floppy_getgeo(struct gendisk *disk, struct hd_geometry *geo) in floppy_getgeo() argument
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H A Dnbd.c124 struct gendisk *disk; member
163 #define nbd_name(nbd) ((nbd)->disk->disk_name)
182 return disk_to_dev(nbd->disk); in nbd_to_dev()
240 struct gendisk *disk = dev_to_disk(dev); in pid_show() local
241 struct nbd_device *nbd = disk->private_data; in pid_show()
254 struct gendisk *disk = dev_to_disk(dev); in backend_show() local
255 struct nbd_device *nbd = disk->private_data; in backend_show()
267 struct gendisk *disk = nbd->disk; in nbd_dev_remove() local
269 del_gendisk(disk); in nbd_dev_remove()
280 put_disk(disk); in nbd_dev_remove()
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/linux/drivers/block/drbd/
H A Ddrbd_state.c127 device_state_change->disk_state[OLD] = device->state.disk; in remember_old_state()
178 device_state_change->disk_state[NEW] = device->state.disk; in remember_new_state()
303 if (device->state.disk != D_DISKLESS || in conn_all_vols_unconf()
376 disk_state = max_t(enum drbd_disk_state, disk_state, device->state.disk); in conn_highest_disk()
392 disk_state = min_t(enum drbd_disk_state, disk_state, device->state.disk); in conn_lowest_disk()
474 (os.disk != D_FAILED && ns.disk == D_FAILED))) || in cl_wide_st_chg()
661 * We grab drbd_md_get_buffer(), because we don't want to "fail" the disk while
675 return drbd_req_state(device, NS(disk, D_FAILED), in request_detach()
689 device->state.disk != D_FAILED); in drbd_request_detach_interruptible()
722 drbd_disk_str(ns.disk), in print_st()
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/linux/drivers/scsi/
H A Dsr.c8 * Linux scsi disk driver by
140 static inline struct scsi_cd *scsi_cd(struct gendisk *disk) in scsi_cd() argument
142 return disk->private_data; in scsi_cd()
302 struct scsi_cd *cd = scsi_cd(rq->q->disk); in sr_done()
342 if (error_sector < get_capacity(cd->disk) && in sr_done()
344 set_capacity(cd->disk, error_sector); in sr_done()
369 cd = scsi_cd(rq->q->disk); in sr_init_command()
398 if (get_disk_ro(cd->disk)) in sr_init_command()
495 static int sr_block_open(struct gendisk *disk, blk_mode_t mode) in sr_block_open() argument
497 struct scsi_cd *cd = scsi_cd(disk); in sr_block_open()
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/linux/Documentation/admin-guide/
H A Dldm.rst2 LDM - Logical Disk Manager (Dynamic Disks)
13 1MiB journalled database at the end of the physical disk. The size of
14 partitions is limited only by disk space. The maximum number of partitions is
25 Once the LDM driver has divided up the disk, you can use the MD driver to
28 To prevent legacy applications from repartitioning the disk, the LDM creates a
29 dummy MSDOS partition containing one disk-sized partition. This is what is
33 GPT label disk. This is not supported by the Linux LDM driver yet.
39 Below we have a 50MiB disk, divided into seven partitions.
43 The missing 1MiB at the end of the disk is where the LDM database is
67 disk, but the driver will sort them.
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/linux/drivers/md/
H A Ddm-era-target.c40 * disk.
46 * This does not free off the on disk bitset as this will normally be done
87 * Wipes the in-core bitset, and creates a new on disk bitset.
156 * On disk metadata layout
203 struct superblock_disk *disk = dm_block_data(b); in sb_prepare_for_write() local
205 disk->blocknr = cpu_to_le64(dm_block_location(b)); in sb_prepare_for_write()
206 disk->csum = cpu_to_le32(dm_bm_checksum(&disk->flags, in sb_prepare_for_write()
211 static int check_metadata_version(struct superblock_disk *disk) in check_metadata_version() argument
213 uint32_t metadata_version = le32_to_cpu(disk->version); in check_metadata_version()
228 struct superblock_disk *disk = dm_block_data(b); in sb_check() local
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H A Draid1.c356 * Update disk head position estimator based on IRQ completion info.
358 static inline void update_head_pos(int disk, struct r1bio *r1_bio) in update_head_pos() argument
362 WRITE_ONCE(conf->mirrors[disk].head_position, in update_head_pos()
367 * Find the disk number which triggered given bio
601 static void update_read_sectors(struct r1conf *conf, int disk, in update_read_sectors() argument
604 struct raid1_info *info = &conf->mirrors[disk]; in update_read_sectors()
617 int disk; in choose_first_rdev() local
619 for (disk = 0 ; disk < conf->raid_disks * 2 ; disk++) { in choose_first_rdev()
623 if (r1_bio->bios[disk] == IO_BLOCKED) in choose_first_rdev()
626 rdev = conf->mirrors[disk].rdev; in choose_first_rdev()
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/linux/fs/quota/
H A Dquotaio_v2.h34 * The following structure defines the format of the disk quota file
35 * (as it appears on disk) - the file is a radix tree whose leaves point
43 __le32 dqb_bhardlimit; /* absolute limit on disk space (in QUOTABLOCK_SIZE) */
44 __le32 dqb_bsoftlimit; /* preferred limit on disk space (in QUOTABLOCK_SIZE) */
46 __le64 dqb_btime; /* time limit for excessive disk use */
56 __le64 dqb_bhardlimit; /* absolute limit on disk space (in QUOTABLOCK_SIZE) */
57 __le64 dqb_bsoftlimit; /* preferred limit on disk space (in QUOTABLOCK_SIZE) */
59 __le64 dqb_btime; /* time limit for excessive disk use */
/linux/Documentation/filesystems/ext4/
H A Dallocators.rst7 generally a desirably quality of a filesystem. On a spinning disk,
9 that the head actuator and disk must perform to access a data block,
10 thus speeding up disk IO. On an SSD there of course are no moving parts,
19 speculatively allocates 8KiB of disk space to the file on the assumption
26 the filesystem defers deciding the exact placement on the disk until all
27 the dirty buffers are being written out to disk. By not committing to a
43 The fifth trick is that the disk volume is cut up into 128MB block
49 over a disk; as the top-level directory/file blobs fill up one block
/linux/fs/
H A Dfs_dirent.c6 * fs on-disk file type to dirent file type conversion
20 * fs_ftype_to_dtype() - fs on-disk file type to dirent type.
21 * @filetype: The on-disk file type to convert.
23 * This function converts the on-disk file type value (FT_*) to the directory
47 * dirent file type to fs on-disk file type conversion
61 * fs_umode_to_ftype() - file mode to on-disk file type.
64 * This function converts the file mode value to the on-disk file type (FT_*).

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