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Merge branch 'for-linus' of git://neil.brown.name/md

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* 'for-linus' of git://neil.brown.name/md: (52 commits)
  md: Protect access to mddev->disks list using RCU
  md: only count actual openers as access which prevent a 'stop'
  md: linear: Make array_size sector-based and rename it to array_sectors.
  md: Make mddev->array_size sector-based.
  md: Make super_type->rdev_size_change() take sector-based sizes.
  md: Fix check for overlapping devices.
  md: Tidy up rdev_size_store a bit:
  md: Remove some unused macros.
  md: Turn rdev->sb_offset into a sector-based quantity.
  md: Make calc_dev_sboffset() return a sector count.
  md: Replace calc_dev_size() by calc_num_sectors().
  md: Make update_size() take the number of sectors.
  md: Better control of when do_md_stop is allowed to stop the array.
  md: get_disk_info(): Don't convert between signed and unsigned and back.
  md: Simplify restart_array().
  md: alloc_disk_sb(): Return proper error value.
  md: Simplify sb_equal().
  md: Simplify uuid_equal().
  md: sb_equal(): Fix misleading printk.
  md: Fix a typo in the comment to cmd_match().
  ...
This commit is contained in:
Linus Torvalds 2008-07-21 10:29:12 -07:00
commit 8a392625b6
16 changed files with 843 additions and 791 deletions
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30
Documentation/md.txt
View file

@ -236,6 +236,11 @@ All md devices contain:
writing the word for the desired state, however some states
cannot be explicitly set, and some transitions are not allowed.
Select/poll works on this file. All changes except between
active_idle and active (which can be frequent and are not
very interesting) are notified. active->active_idle is
reported if the metadata is externally managed.
clear
No devices, no size, no level
Writing is equivalent to STOP_ARRAY ioctl
@ -292,6 +297,10 @@ Each directory contains:
writemostly - device will only be subject to read
requests if there are no other options.
This applies only to raid1 arrays.
blocked - device has failed, metadata is "external",
and the failure hasn't been acknowledged yet.
Writes that would write to this device if
it were not faulty are blocked.
spare - device is working, but not a full member.
This includes spares that are in the process
of being recovered to
@ -301,6 +310,12 @@ Each directory contains:
Writing "remove" removes the device from the array.
Writing "writemostly" sets the writemostly flag.
Writing "-writemostly" clears the writemostly flag.
Writing "blocked" sets the "blocked" flag.
Writing "-blocked" clear the "blocked" flag and allows writes
to complete.
This file responds to select/poll. Any change to 'faulty'
or 'blocked' causes an event.
errors
An approximate count of read errors that have been detected on
@ -332,7 +347,7 @@ Each directory contains:
for storage of data. This will normally be the same as the
component_size. This can be written while assembling an
array. If a value less than the current component_size is
written, component_size will be reduced to this value.
written, it will be rejected.
An active md device will also contain and entry for each active device
@ -381,6 +396,19 @@ also have
'check' and 'repair' will start the appropriate process
providing the current state is 'idle'.
This file responds to select/poll. Any important change in the value
triggers a poll event. Sometimes the value will briefly be
"recover" if a recovery seems to be needed, but cannot be
achieved. In that case, the transition to "recover" isn't
notified, but the transition away is.
degraded
This contains a count of the number of devices by which the
arrays is degraded. So an optimal array with show '0'. A
single failed/missing drive will show '1', etc.
This file responds to select/poll, any increase or decrease
in the count of missing devices will trigger an event.
mismatch_count
When performing 'check' and 'repair', and possibly when
performing 'resync', md will count the number of errors that are

54
drivers/md/bitmap.c
View file

@ -225,7 +225,7 @@ static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long inde
|| test_bit(Faulty, &rdev->flags))
continue;
target = (rdev->sb_offset << 1) + offset + index * (PAGE_SIZE/512);
target = rdev->sb_start + offset + index * (PAGE_SIZE/512);
if (sync_page_io(rdev->bdev, target, PAGE_SIZE, page, READ)) {
page->index = index;
@ -241,10 +241,10 @@ static struct page *read_sb_page(mddev_t *mddev, long offset, unsigned long inde
static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
{
mdk_rdev_t *rdev;
struct list_head *tmp;
mddev_t *mddev = bitmap->mddev;
rdev_for_each(rdev, tmp, mddev)
rcu_read_lock();
rdev_for_each_rcu(rdev, mddev)
if (test_bit(In_sync, &rdev->flags)
&& !test_bit(Faulty, &rdev->flags)) {
int size = PAGE_SIZE;
@ -260,32 +260,37 @@ static int write_sb_page(struct bitmap *bitmap, struct page *page, int wait)
+ (long)(page->index * (PAGE_SIZE/512))
+ size/512 > 0)
/* bitmap runs in to metadata */
return -EINVAL;
goto bad_alignment;
if (rdev->data_offset + mddev->size*2
> rdev->sb_offset*2 + bitmap->offset)
> rdev->sb_start + bitmap->offset)
/* data runs in to bitmap */
return -EINVAL;
} else if (rdev->sb_offset*2 < rdev->data_offset) {
goto bad_alignment;
} else if (rdev->sb_start < rdev->data_offset) {
/* METADATA BITMAP DATA */
if (rdev->sb_offset*2
if (rdev->sb_start
+ bitmap->offset
+ page->index*(PAGE_SIZE/512) + size/512
> rdev->data_offset)
/* bitmap runs in to data */
return -EINVAL;
goto bad_alignment;
} else {
/* DATA METADATA BITMAP - no problems */
}
md_super_write(mddev, rdev,
(rdev->sb_offset<<1) + bitmap->offset
rdev->sb_start + bitmap->offset
+ page->index * (PAGE_SIZE/512),
size,
page);
}
rcu_read_unlock();
if (wait)
md_super_wait(mddev);
return 0;
bad_alignment:
rcu_read_unlock();
return -EINVAL;
}
static void bitmap_file_kick(struct bitmap *bitmap);
@ -454,8 +459,11 @@ void bitmap_update_sb(struct bitmap *bitmap)
spin_unlock_irqrestore(&bitmap->lock, flags);
sb = (bitmap_super_t *)kmap_atomic(bitmap->sb_page, KM_USER0);
sb->events = cpu_to_le64(bitmap->mddev->events);
if (!bitmap->mddev->degraded)
sb->events_cleared = cpu_to_le64(bitmap->mddev->events);
if (bitmap->mddev->events < bitmap->events_cleared) {
/* rocking back to read-only */
bitmap->events_cleared = bitmap->mddev->events;
sb->events_cleared = cpu_to_le64(bitmap->events_cleared);
}
kunmap_atomic(sb, KM_USER0);
write_page(bitmap, bitmap->sb_page, 1);
}
@ -1085,9 +1093,19 @@ void bitmap_daemon_work(struct bitmap *bitmap)
} else
spin_unlock_irqrestore(&bitmap->lock, flags);
lastpage = page;
/*
printk("bitmap clean at page %lu\n", j);
*/
/* We are possibly going to clear some bits, so make
* sure that events_cleared is up-to-date.
*/
if (bitmap->need_sync) {
bitmap_super_t *sb;
bitmap->need_sync = 0;
sb = kmap_atomic(bitmap->sb_page, KM_USER0);
sb->events_cleared =
cpu_to_le64(bitmap->events_cleared);
kunmap_atomic(sb, KM_USER0);
write_page(bitmap, bitmap->sb_page, 1);
}
spin_lock_irqsave(&bitmap->lock, flags);
clear_page_attr(bitmap, page, BITMAP_PAGE_CLEAN);
}
@ -1257,6 +1275,12 @@ void bitmap_endwrite(struct bitmap *bitmap, sector_t offset, unsigned long secto
return;
}
if (success &&
bitmap->events_cleared < bitmap->mddev->events) {
bitmap->events_cleared = bitmap->mddev->events;
bitmap->need_sync = 1;
}
if (!success && ! (*bmc & NEEDED_MASK))
*bmc |= NEEDED_MASK;

2
drivers/md/faulty.c
View file

@ -297,7 +297,7 @@ static int run(mddev_t *mddev)
rdev_for_each(rdev, tmp, mddev)
conf->rdev = rdev;
mddev->array_size = mddev->size;
mddev->array_sectors = mddev->size * 2;
mddev->private = conf;
reconfig(mddev, mddev->layout, -1);

20
drivers/md/linear.c
View file

@ -122,13 +122,13 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
return NULL;
cnt = 0;
conf->array_size = 0;
conf->array_sectors = 0;
rdev_for_each(rdev, tmp, mddev) {
int j = rdev->raid_disk;
dev_info_t *disk = conf->disks + j;
if (j < 0 || j > raid_disks || disk->rdev) {
if (j < 0 || j >= raid_disks || disk->rdev) {
printk("linear: disk numbering problem. Aborting!\n");
goto out;
}
@ -146,7 +146,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
blk_queue_max_sectors(mddev->queue, PAGE_SIZE>>9);
disk->size = rdev->size;
conf->array_size += rdev->size;
conf->array_sectors += rdev->size * 2;
cnt++;
}
@ -155,7 +155,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
goto out;
}
min_spacing = conf->array_size;
min_spacing = conf->array_sectors / 2;
sector_div(min_spacing, PAGE_SIZE/sizeof(struct dev_info *));
/* min_spacing is the minimum spacing that will fit the hash
@ -164,7 +164,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
* that is larger than min_spacing as use the size of that as
* the actual spacing
*/
conf->hash_spacing = conf->array_size;
conf->hash_spacing = conf->array_sectors / 2;
for (i=0; i < cnt-1 ; i++) {
sector_t sz = 0;
int j;
@ -194,7 +194,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
unsigned round;
unsigned long base;
sz = conf->array_size >> conf->preshift;
sz = conf->array_sectors >> (conf->preshift + 1);
sz += 1; /* force round-up */
base = conf->hash_spacing >> conf->preshift;
round = sector_div(sz, base);
@ -221,7 +221,7 @@ static linear_conf_t *linear_conf(mddev_t *mddev, int raid_disks)
curr_offset = 0;
i = 0;
for (curr_offset = 0;
curr_offset < conf->array_size;
curr_offset < conf->array_sectors / 2;
curr_offset += conf->hash_spacing) {
while (i < raid_disks-1 &&
@ -258,7 +258,7 @@ static int linear_run (mddev_t *mddev)
if (!conf)
return 1;
mddev->private = conf;
mddev->array_size = conf->array_size;
mddev->array_sectors = conf->array_sectors;
blk_queue_merge_bvec(mddev->queue, linear_mergeable_bvec);
mddev->queue->unplug_fn = linear_unplug;
@ -292,8 +292,8 @@ static int linear_add(mddev_t *mddev, mdk_rdev_t *rdev)
newconf->prev = mddev_to_conf(mddev);
mddev->private = newconf;
mddev->raid_disks++;
mddev->array_size = newconf->array_size;
set_capacity(mddev->gendisk, mddev->array_size << 1);
mddev->array_sectors = newconf->array_sectors;
set_capacity(mddev->gendisk, mddev->array_sectors);
return 0;
}

615
drivers/md/md.c
View file

File diff suppressed because it is too large Load diff

17
drivers/md/multipath.c
View file

@ -281,13 +281,18 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
{
multipath_conf_t *conf = mddev->private;
struct request_queue *q;
int found = 0;
int err = -EEXIST;
int path;
struct multipath_info *p;
int first = 0;
int last = mddev->raid_disks - 1;
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
print_multipath_conf(conf);
for (path=0; path<mddev->raid_disks; path++)
for (path = first; path <= last; path++)
if ((p=conf->multipaths+path)->rdev == NULL) {
q = rdev->bdev->bd_disk->queue;
blk_queue_stack_limits(mddev->queue, q);
@ -307,11 +312,13 @@ static int multipath_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
rdev->raid_disk = path;
set_bit(In_sync, &rdev->flags);
rcu_assign_pointer(p->rdev, rdev);
found = 1;
err = 0;
break;
}
print_multipath_conf(conf);
return found;
return err;
}
static int multipath_remove_disk(mddev_t *mddev, int number)
@ -497,7 +504,7 @@ static int multipath_run (mddev_t *mddev)
/*
* Ok, everything is just fine now
*/
mddev->array_size = mddev->size;
mddev->array_sectors = mddev->size * 2;
mddev->queue->unplug_fn = multipath_unplug;
mddev->queue->backing_dev_info.congested_fn = multipath_congested;

8
drivers/md/raid0.c
View file

@ -295,16 +295,16 @@ static int raid0_run (mddev_t *mddev)
goto out_free_conf;
/* calculate array device size */
mddev->array_size = 0;
mddev->array_sectors = 0;
rdev_for_each(rdev, tmp, mddev)
mddev->array_size += rdev->size;
mddev->array_sectors += rdev->size * 2;
printk("raid0 : md_size is %llu blocks.\n",
(unsigned long long)mddev->array_size);
(unsigned long long)mddev->array_sectors / 2);
printk("raid0 : conf->hash_spacing is %llu blocks.\n",
(unsigned long long)conf->hash_spacing);
{
sector_t s = mddev->array_size;
sector_t s = mddev->array_sectors / 2;
sector_t space = conf->hash_spacing;
int round;
conf->preshift = 0;

30
drivers/md/raid1.c
View file

@ -1100,11 +1100,16 @@ static int raid1_spare_active(mddev_t *mddev)
static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
{
conf_t *conf = mddev->private;
int found = 0;
int err = -EEXIST;
int mirror = 0;
mirror_info_t *p;
int first = 0;
int last = mddev->raid_disks - 1;
for (mirror=0; mirror < mddev->raid_disks; mirror++)
if (rdev->raid_disk >= 0)
first = last = rdev->raid_disk;
for (mirror = first; mirror <= last; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
blk_queue_stack_limits(mddev->queue,
@ -1119,7 +1124,7 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
p->head_position = 0;
rdev->raid_disk = mirror;
found = 1;
err = 0;
/* As all devices are equivalent, we don't need a full recovery
* if this was recently any drive of the array
*/
@ -1130,7 +1135,7 @@ static int raid1_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
}
print_conf(conf);
return found;
return err;
}
static int raid1_remove_disk(mddev_t *mddev, int number)
@ -2038,7 +2043,7 @@ static int run(mddev_t *mddev)
/*
* Ok, everything is just fine now
*/
mddev->array_size = mddev->size;
mddev->array_sectors = mddev->size * 2;
mddev->queue->unplug_fn = raid1_unplug;
mddev->queue->backing_dev_info.congested_fn = raid1_congested;
@ -2100,14 +2105,15 @@ static int raid1_resize(mddev_t *mddev, sector_t sectors)
* any io in the removed space completes, but it hardly seems
* worth it.
*/
mddev->array_size = sectors>>1;
set_capacity(mddev->gendisk, mddev->array_size << 1);
mddev->array_sectors = sectors;
set_capacity(mddev->gendisk, mddev->array_sectors);
mddev->changed = 1;
if (mddev->array_size > mddev->size && mddev->recovery_cp == MaxSector) {
if (mddev->array_sectors / 2 > mddev->size &&
mddev->recovery_cp == MaxSector) {
mddev->recovery_cp = mddev->size << 1;
set_bit(MD_RECOVERY_NEEDED, &mddev->recovery);
}
mddev->size = mddev->array_size;
mddev->size = mddev->array_sectors / 2;
mddev->resync_max_sectors = sectors;
return 0;
}
@ -2131,7 +2137,7 @@ static int raid1_reshape(mddev_t *mddev)
conf_t *conf = mddev_to_conf(mddev);
int cnt, raid_disks;
unsigned long flags;
int d, d2;
int d, d2, err;
/* Cannot change chunk_size, layout, or level */
if (mddev->chunk_size != mddev->new_chunk ||
@ -2143,7 +2149,9 @@ static int raid1_reshape(mddev_t *mddev)
return -EINVAL;
}
md_allow_write(mddev);
err = md_allow_write(mddev);
if (err)
return err;
raid_disks = mddev->raid_disks + mddev->delta_disks;

22
drivers/md/raid10.c
View file

@ -1114,24 +1114,30 @@ static int raid10_spare_active(mddev_t *mddev)
static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
{
conf_t *conf = mddev->private;
int found = 0;
int err = -EEXIST;
int mirror;
mirror_info_t *p;
int first = 0;
int last = mddev->raid_disks - 1;
if (mddev->recovery_cp < MaxSector)
/* only hot-add to in-sync arrays, as recovery is
* very different from resync
*/
return 0;
return -EBUSY;
if (!enough(conf))
return 0;
return -EINVAL;
if (rdev->raid_disk)
first = last = rdev->raid_disk;
if (rdev->saved_raid_disk >= 0 &&
rdev->saved_raid_disk >= first &&
conf->mirrors[rdev->saved_raid_disk].rdev == NULL)
mirror = rdev->saved_raid_disk;
else
mirror = 0;
for ( ; mirror < mddev->raid_disks; mirror++)
mirror = first;
for ( ; mirror <= last ; mirror++)
if ( !(p=conf->mirrors+mirror)->rdev) {
blk_queue_stack_limits(mddev->queue,
@ -1146,7 +1152,7 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
p->head_position = 0;
rdev->raid_disk = mirror;
found = 1;
err = 0;
if (rdev->saved_raid_disk != mirror)
conf->fullsync = 1;
rcu_assign_pointer(p->rdev, rdev);
@ -1154,7 +1160,7 @@ static int raid10_add_disk(mddev_t *mddev, mdk_rdev_t *rdev)
}
print_conf(conf);
return found;
return err;
}
static int raid10_remove_disk(mddev_t *mddev, int number)
@ -2159,7 +2165,7 @@ static int run(mddev_t *mddev)
/*
* Ok, everything is just fine now
*/
mddev->array_size = size << (conf->chunk_shift-1);
mddev->array_sectors = size << conf->chunk_shift;
mddev->resync_max_sectors = size << conf->chunk_shift;
mddev->queue->unplug_fn = raid10_unplug;

747
drivers/md/raid5.c
View file

File diff suppressed because it is too large Load diff

1
include/linux/raid/bitmap.h
View file

@ -221,6 +221,7 @@ struct bitmap {
unsigned long syncchunk;
__u64 events_cleared;
int need_sync;
/* bitmap spinlock */
spinlock_t lock;

2
include/linux/raid/linear.h
View file

@ -16,7 +16,7 @@ struct linear_private_data
struct linear_private_data *prev; /* earlier version */
dev_info_t **hash_table;
sector_t hash_spacing;
sector_t array_size;
sector_t array_sectors;
int preshift; /* shift before dividing by hash_spacing */
dev_info_t disks[0];
};

2
include/linux/raid/md.h
View file

@ -95,7 +95,7 @@ extern int sync_page_io(struct block_device *bdev, sector_t sector, int size,
struct page *page, int rw);
extern void md_do_sync(mddev_t *mddev);
extern void md_new_event(mddev_t *mddev);
extern void md_allow_write(mddev_t *mddev);
extern int md_allow_write(mddev_t *mddev);
extern void md_wait_for_blocked_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
#endif /* CONFIG_MD */

17
include/linux/raid/md_k.h
View file

@ -59,7 +59,7 @@ struct mdk_rdev_s
int sb_loaded;
__u64 sb_events;
sector_t data_offset; /* start of data in array */
sector_t sb_offset;
sector_t sb_start; /* offset of the super block (in 512byte sectors) */
int sb_size; /* bytes in the superblock */
int preferred_minor; /* autorun support */
@ -87,6 +87,9 @@ struct mdk_rdev_s
#define Blocked 8 /* An error occured on an externally
* managed array, don't allow writes
* until it is cleared */
#define StateChanged 9 /* Faulty or Blocked has changed during
* interrupt, so it needs to be
* notified by the thread */
wait_queue_head_t blocked_wait;
int desc_nr; /* descriptor index in the superblock */
@ -147,7 +150,7 @@ struct mddev_s
int raid_disks;
int max_disks;
sector_t size; /* used size of component devices */
sector_t array_size; /* exported array size */
sector_t array_sectors; /* exported array size */
__u64 events;
char uuid[16];
@ -188,6 +191,7 @@ struct mddev_s
* NEEDED: we might need to start a resync/recover
* RUNNING: a thread is running, or about to be started
* SYNC: actually doing a resync, not a recovery
* RECOVER: doing recovery, or need to try it.
* INTR: resync needs to be aborted for some reason
* DONE: thread is done and is waiting to be reaped
* REQUEST: user-space has requested a sync (used with SYNC)
@ -198,6 +202,7 @@ struct mddev_s
*/
#define MD_RECOVERY_RUNNING 0
#define MD_RECOVERY_SYNC 1
#define MD_RECOVERY_RECOVER 2
#define MD_RECOVERY_INTR 3
#define MD_RECOVERY_DONE 4
#define MD_RECOVERY_NEEDED 5
@ -210,7 +215,8 @@ struct mddev_s
int in_sync; /* know to not need resync */
struct mutex reconfig_mutex;
atomic_t active;
atomic_t active; /* general refcount */
atomic_t openers; /* number of active opens */
int changed; /* true if we might need to reread partition info */
int degraded; /* whether md should consider
@ -227,6 +233,8 @@ struct mddev_s
atomic_t recovery_active; /* blocks scheduled, but not written */
wait_queue_head_t recovery_wait;
sector_t recovery_cp;
sector_t resync_min; /* user requested sync
* starts here */
sector_t resync_max; /* resync should pause
* when it gets here */
@ -331,6 +339,9 @@ static inline char * mdname (mddev_t * mddev)
#define rdev_for_each(rdev, tmp, mddev) \
rdev_for_each_list(rdev, tmp, (mddev)->disks)
#define rdev_for_each_rcu(rdev, mddev) \
list_for_each_entry_rcu(rdev, &((mddev)->disks), same_set)
typedef struct mdk_thread_s {
void (*run) (mddev_t *mddev);
mddev_t *mddev;

3
include/linux/raid/md_p.h
View file

@ -43,14 +43,11 @@
*/
#define MD_RESERVED_BYTES (64 * 1024)
#define MD_RESERVED_SECTORS (MD_RESERVED_BYTES / 512)
#define MD_RESERVED_BLOCKS (MD_RESERVED_BYTES / BLOCK_SIZE)
#define MD_NEW_SIZE_SECTORS(x) ((x & ~(MD_RESERVED_SECTORS - 1)) - MD_RESERVED_SECTORS)
#define MD_NEW_SIZE_BLOCKS(x) ((x & ~(MD_RESERVED_BLOCKS - 1)) - MD_RESERVED_BLOCKS)
#define MD_SB_BYTES 4096
#define MD_SB_WORDS (MD_SB_BYTES / 4)
#define MD_SB_BLOCKS (MD_SB_BYTES / BLOCK_SIZE)
#define MD_SB_SECTORS (MD_SB_BYTES / 512)
/*

64
include/linux/raid/raid5.h
View file

@ -158,6 +158,43 @@
* the compute block completes.
*/
/*
* Operations state - intermediate states that are visible outside of sh->lock
* In general _idle indicates nothing is running, _run indicates a data
* processing operation is active, and _result means the data processing result
* is stable and can be acted upon. For simple operations like biofill and
* compute that only have an _idle and _run state they are indicated with
* sh->state flags (STRIPE_BIOFILL_RUN and STRIPE_COMPUTE_RUN)
*/
/**
* enum check_states - handles syncing / repairing a stripe
* @check_state_idle - check operations are quiesced
* @check_state_run - check operation is running
* @check_state_result - set outside lock when check result is valid
* @check_state_compute_run - check failed and we are repairing
* @check_state_compute_result - set outside lock when compute result is valid
*/
enum check_states {
check_state_idle = 0,
check_state_run, /* parity check */
check_state_check_result,
check_state_compute_run, /* parity repair */
check_state_compute_result,
};
/**
* enum reconstruct_states - handles writing or expanding a stripe
*/
enum reconstruct_states {
reconstruct_state_idle = 0,
reconstruct_state_prexor_drain_run, /* prexor-write */
reconstruct_state_drain_run, /* write */
reconstruct_state_run, /* expand */
reconstruct_state_prexor_drain_result,
reconstruct_state_drain_result,
reconstruct_state_result,
};
struct stripe_head {
struct hlist_node hash;
struct list_head lru; /* inactive_list or handle_list */
@ -169,19 +206,13 @@ struct stripe_head {
spinlock_t lock;
int bm_seq; /* sequence number for bitmap flushes */
int disks; /* disks in stripe */
enum check_states check_state;
enum reconstruct_states reconstruct_state;
/* stripe_operations
* @pending - pending ops flags (set for request->issue->complete)
* @ack - submitted ops flags (set for issue->complete)
* @complete - completed ops flags (set for complete)
* @target - STRIPE_OP_COMPUTE_BLK target
* @count - raid5_runs_ops is set to run when this is non-zero
*/
struct stripe_operations {
unsigned long pending;
unsigned long ack;
unsigned long complete;
int target;
int count;
u32 zero_sum_result;
} ops;
struct r5dev {
@ -202,6 +233,7 @@ struct stripe_head_state {
int locked, uptodate, to_read, to_write, failed, written;
int to_fill, compute, req_compute, non_overwrite;
int failed_num;
unsigned long ops_request;
};
/* r6_state - extra state data only relevant to r6 */
@ -228,9 +260,7 @@ struct r6_state {
#define R5_Wantfill 12 /* dev->toread contains a bio that needs
* filling
*/
#define R5_Wantprexor 13 /* distinguish blocks ready for rmw from
* other "towrites"
*/
#define R5_Wantdrain 13 /* dev->towrite needs to be drained */
/*
* Write method
*/
@ -254,8 +284,10 @@ struct r6_state {
#define STRIPE_EXPAND_READY 11
#define STRIPE_IO_STARTED 12 /* do not count towards 'bypass_count' */
#define STRIPE_FULL_WRITE 13 /* all blocks are set to be overwritten */
#define STRIPE_BIOFILL_RUN 14
#define STRIPE_COMPUTE_RUN 15
/*
* Operations flags (in issue order)
* Operation request flags
*/
#define STRIPE_OP_BIOFILL 0
#define STRIPE_OP_COMPUTE_BLK 1
@ -263,14 +295,6 @@ struct r6_state {
#define STRIPE_OP_BIODRAIN 3
#define STRIPE_OP_POSTXOR 4
#define STRIPE_OP_CHECK 5
#define STRIPE_OP_IO 6
/* modifiers to the base operations
* STRIPE_OP_MOD_REPAIR_PD - compute the parity block and write it back
* STRIPE_OP_MOD_DMA_CHECK - parity is not corrupted by the check
*/
#define STRIPE_OP_MOD_REPAIR_PD 7
#define STRIPE_OP_MOD_DMA_CHECK 8
/*
* Plugging: