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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: (75 commits)
  md/raid10: handle further errors during fix_read_error better.
  md/raid10: Handle read errors during recovery better.
  md/raid10: simplify read error handling during recovery.
  md/raid10: record bad blocks due to write errors during resync/recovery.
  md/raid10:  attempt to fix read errors during resync/check
  md/raid10:  Handle write errors by updating badblock log.
  md/raid10: clear bad-block record when write succeeds.
  md/raid10: avoid writing to known bad blocks on known bad drives.
  md/raid10 record bad blocks as needed during recovery.
  md/raid10: avoid reading known bad blocks during resync/recovery.
  md/raid10 - avoid reading from known bad blocks - part 3
  md/raid10: avoid reading from known bad blocks - part 2
  md/raid10: avoid reading from known bad blocks - part 1
  md/raid10: Split handle_read_error out from raid10d.
  md/raid10: simplify/reindent some loops.
  md/raid5: Clear bad blocks on successful write.
  md/raid5.  Don't write to known bad block on doubtful devices.
  md/raid5: write errors should be recorded as bad blocks if possible.
  md/raid5: use bad-block log to improve handling of uncorrectable read errors.
  md/raid5: avoid reading from known bad blocks.
  ...
This commit is contained in:
Linus Torvalds 2011-07-28 05:50:27 -07:00
commit 6140333d36
12 changed files with 3093 additions and 1379 deletions
Download patch file Download diff file Expand all files Collapse all files

135
drivers/md/bitmap.c
View file

@ -29,7 +29,6 @@
#include "md.h"
#include "bitmap.h"
#include <linux/dm-dirty-log.h>
/* debug macros */
#define DEBUG 0
@ -775,10 +774,8 @@ static inline unsigned long file_page_offset(struct bitmap *bitmap, unsigned lon
* 0 or page 1
*/
static inline struct page *filemap_get_page(struct bitmap *bitmap,
unsigned long chunk)
unsigned long chunk)
{
if (bitmap->filemap == NULL)
return NULL;
if (file_page_index(bitmap, chunk) >= bitmap->file_pages)
return NULL;
return bitmap->filemap[file_page_index(bitmap, chunk)
@ -878,28 +875,19 @@ enum bitmap_page_attr {
static inline void set_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
if (page)
__set_bit((page->index<<2) + attr, bitmap->filemap_attr);
else
__set_bit(attr, &bitmap->logattrs);
__set_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
static inline void clear_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
if (page)
__clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
else
__clear_bit(attr, &bitmap->logattrs);
__clear_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *page,
enum bitmap_page_attr attr)
{
if (page)
return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
else
return test_bit(attr, &bitmap->logattrs);
return test_bit((page->index<<2) + attr, bitmap->filemap_attr);
}
/*
@ -912,30 +900,26 @@ static inline unsigned long test_page_attr(struct bitmap *bitmap, struct page *p
static void bitmap_file_set_bit(struct bitmap *bitmap, sector_t block)
{
unsigned long bit;
struct page *page = NULL;
struct page *page;
void *kaddr;
unsigned long chunk = block >> CHUNK_BLOCK_SHIFT(bitmap);
if (!bitmap->filemap) {
struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log;
if (log)
log->type->mark_region(log, chunk);
} else {
if (!bitmap->filemap)
return;
page = filemap_get_page(bitmap, chunk);
if (!page)
return;
bit = file_page_offset(bitmap, chunk);
page = filemap_get_page(bitmap, chunk);
if (!page)
return;
bit = file_page_offset(bitmap, chunk);
/* set the bit */
kaddr = kmap_atomic(page, KM_USER0);
if (bitmap->flags & BITMAP_HOSTENDIAN)
set_bit(bit, kaddr);
else
__test_and_set_bit_le(bit, kaddr);
kunmap_atomic(kaddr, KM_USER0);
PRINTK("set file bit %lu page %lu\n", bit, page->index);
}
/* set the bit */
kaddr = kmap_atomic(page, KM_USER0);
if (bitmap->flags & BITMAP_HOSTENDIAN)
set_bit(bit, kaddr);
else
__set_bit_le(bit, kaddr);
kunmap_atomic(kaddr, KM_USER0);
PRINTK("set file bit %lu page %lu\n", bit, page->index);
/* record page number so it gets flushed to disk when unplug occurs */
set_page_attr(bitmap, page, BITMAP_PAGE_DIRTY);
}
@ -952,16 +936,6 @@ void bitmap_unplug(struct bitmap *bitmap)
if (!bitmap)
return;
if (!bitmap->filemap) {
/* Must be using a dirty_log */
struct dm_dirty_log *log = bitmap->mddev->bitmap_info.log;
dirty = test_and_clear_bit(BITMAP_PAGE_DIRTY, &bitmap->logattrs);
need_write = test_and_clear_bit(BITMAP_PAGE_NEEDWRITE, &bitmap->logattrs);
if (dirty || need_write)
if (log->type->flush(log))
bitmap->flags |= BITMAP_WRITE_ERROR;
goto out;
}
/* look at each page to see if there are any set bits that need to be
* flushed out to disk */
@ -990,7 +964,6 @@ void bitmap_unplug(struct bitmap *bitmap)
else
md_super_wait(bitmap->mddev);
}
out:
if (bitmap->flags & BITMAP_WRITE_ERROR)
bitmap_file_kick(bitmap);
}
@ -1199,7 +1172,6 @@ void bitmap_daemon_work(mddev_t *mddev)
struct page *page = NULL, *lastpage = NULL;
sector_t blocks;
void *paddr;
struct dm_dirty_log *log = mddev->bitmap_info.log;
/* Use a mutex to guard daemon_work against
* bitmap_destroy.
@ -1224,12 +1196,11 @@ void bitmap_daemon_work(mddev_t *mddev)
spin_lock_irqsave(&bitmap->lock, flags);
for (j = 0; j < bitmap->chunks; j++) {
bitmap_counter_t *bmc;
if (!bitmap->filemap) {
if (!log)
/* error or shutdown */
break;
} else
page = filemap_get_page(bitmap, j);
if (!bitmap->filemap)
/* error or shutdown */
break;
page = filemap_get_page(bitmap, j);
if (page != lastpage) {
/* skip this page unless it's marked as needing cleaning */
@ -1298,17 +1269,16 @@ void bitmap_daemon_work(mddev_t *mddev)
-1);
/* clear the bit */
if (page) {
paddr = kmap_atomic(page, KM_USER0);
if (bitmap->flags & BITMAP_HOSTENDIAN)
clear_bit(file_page_offset(bitmap, j),
paddr);
else
__test_and_clear_bit_le(file_page_offset(bitmap, j),
paddr);
kunmap_atomic(paddr, KM_USER0);
} else
log->type->clear_region(log, j);
paddr = kmap_atomic(page, KM_USER0);
if (bitmap->flags & BITMAP_HOSTENDIAN)
clear_bit(file_page_offset(bitmap, j),
paddr);
else
__clear_bit_le(
file_page_offset(bitmap,
j),
paddr);
kunmap_atomic(paddr, KM_USER0);
}
} else
j |= PAGE_COUNTER_MASK;
@ -1316,16 +1286,12 @@ void bitmap_daemon_work(mddev_t *mddev)
spin_unlock_irqrestore(&bitmap->lock, flags);
/* now sync the final page */
if (lastpage != NULL || log != NULL) {
if (lastpage != NULL) {
spin_lock_irqsave(&bitmap->lock, flags);
if (test_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE)) {
clear_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
spin_unlock_irqrestore(&bitmap->lock, flags);
if (lastpage)
write_page(bitmap, lastpage, 0);
else
if (log->type->flush(log))
bitmap->flags |= BITMAP_WRITE_ERROR;
write_page(bitmap, lastpage, 0);
} else {
set_page_attr(bitmap, lastpage, BITMAP_PAGE_NEEDWRITE);
spin_unlock_irqrestore(&bitmap->lock, flags);
@ -1767,12 +1733,10 @@ int bitmap_create(mddev_t *mddev)
BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);
if (!file
&& !mddev->bitmap_info.offset
&& !mddev->bitmap_info.log) /* bitmap disabled, nothing to do */
&& !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */
return 0;
BUG_ON(file && mddev->bitmap_info.offset);
BUG_ON(mddev->bitmap_info.offset && mddev->bitmap_info.log);
bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);
if (!bitmap)
@ -1863,6 +1827,7 @@ int bitmap_create(mddev_t *mddev)
int bitmap_load(mddev_t *mddev)
{
int err = 0;
sector_t start = 0;
sector_t sector = 0;
struct bitmap *bitmap = mddev->bitmap;
@ -1881,24 +1846,14 @@ int bitmap_load(mddev_t *mddev)
}
bitmap_close_sync(bitmap);
if (mddev->bitmap_info.log) {
unsigned long i;
struct dm_dirty_log *log = mddev->bitmap_info.log;
for (i = 0; i < bitmap->chunks; i++)
if (!log->type->in_sync(log, i, 1))
bitmap_set_memory_bits(bitmap,
(sector_t)i << CHUNK_BLOCK_SHIFT(bitmap),
1);
} else {
sector_t start = 0;
if (mddev->degraded == 0
|| bitmap->events_cleared == mddev->events)
/* no need to keep dirty bits to optimise a
* re-add of a missing device */
start = mddev->recovery_cp;
if (mddev->degraded == 0
|| bitmap->events_cleared == mddev->events)
/* no need to keep dirty bits to optimise a
* re-add of a missing device */
start = mddev->recovery_cp;
err = bitmap_init_from_disk(bitmap, start);
err = bitmap_init_from_disk(bitmap, start);
}
if (err)
goto out;

5
drivers/md/bitmap.h
View file

@ -212,10 +212,6 @@ struct bitmap {
unsigned long file_pages; /* number of pages in the file */
int last_page_size; /* bytes in the last page */
unsigned long logattrs; /* used when filemap_attr doesn't exist
* because we are working with a dirty_log
*/
unsigned long flags;
int allclean;
@ -237,7 +233,6 @@ struct bitmap {
wait_queue_head_t behind_wait;
struct sysfs_dirent *sysfs_can_clear;
};
/* the bitmap API */

871
drivers/md/md.c
View file

File diff suppressed because it is too large Load diff

110
drivers/md/md.h
View file

@ -29,6 +29,13 @@
typedef struct mddev_s mddev_t;
typedef struct mdk_rdev_s mdk_rdev_t;
/* Bad block numbers are stored sorted in a single page.
* 64bits is used for each block or extent.
* 54 bits are sector number, 9 bits are extent size,
* 1 bit is an 'acknowledged' flag.
*/
#define MD_MAX_BADBLOCKS (PAGE_SIZE/8)
/*
* MD's 'extended' device
*/
@ -48,7 +55,7 @@ struct mdk_rdev_s
struct block_device *meta_bdev;
struct block_device *bdev; /* block device handle */
struct page *sb_page;
struct page *sb_page, *bb_page;
int sb_loaded;
__u64 sb_events;
sector_t data_offset; /* start of data in array */
@ -74,9 +81,29 @@ struct mdk_rdev_s
#define In_sync 2 /* device is in_sync with rest of array */
#define WriteMostly 4 /* Avoid reading if at all possible */
#define AutoDetected 7 /* added by auto-detect */
#define Blocked 8 /* An error occurred on an externally
* managed array, don't allow writes
#define Blocked 8 /* An error occurred but has not yet
* been acknowledged by the metadata
* handler, so don't allow writes
* until it is cleared */
#define WriteErrorSeen 9 /* A write error has been seen on this
* device
*/
#define FaultRecorded 10 /* Intermediate state for clearing
* Blocked. The Fault is/will-be
* recorded in the metadata, but that
* metadata hasn't been stored safely
* on disk yet.
*/
#define BlockedBadBlocks 11 /* A writer is blocked because they
* found an unacknowledged bad-block.
* This can safely be cleared at any
* time, and the writer will re-check.
* It may be set at any time, and at
* worst the writer will timeout and
* re-check. So setting it as
* accurately as possible is good, but
* not absolutely critical.
*/
wait_queue_head_t blocked_wait;
int desc_nr; /* descriptor index in the superblock */
@ -111,8 +138,54 @@ struct mdk_rdev_s
struct sysfs_dirent *sysfs_state; /* handle for 'state'
* sysfs entry */
struct badblocks {
int count; /* count of bad blocks */
int unacked_exist; /* there probably are unacknowledged
* bad blocks. This is only cleared
* when a read discovers none
*/
int shift; /* shift from sectors to block size
* a -ve shift means badblocks are
* disabled.*/
u64 *page; /* badblock list */
int changed;
seqlock_t lock;
sector_t sector;
sector_t size; /* in sectors */
} badblocks;
};
#define BB_LEN_MASK (0x00000000000001FFULL)
#define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL)
#define BB_ACK_MASK (0x8000000000000000ULL)
#define BB_MAX_LEN 512
#define BB_OFFSET(x) (((x) & BB_OFFSET_MASK) >> 9)
#define BB_LEN(x) (((x) & BB_LEN_MASK) + 1)
#define BB_ACK(x) (!!((x) & BB_ACK_MASK))
#define BB_MAKE(a, l, ack) (((a)<<9) | ((l)-1) | ((u64)(!!(ack)) << 63))
extern int md_is_badblock(struct badblocks *bb, sector_t s, int sectors,
sector_t *first_bad, int *bad_sectors);
static inline int is_badblock(mdk_rdev_t *rdev, sector_t s, int sectors,
sector_t *first_bad, int *bad_sectors)
{
if (unlikely(rdev->badblocks.count)) {
int rv = md_is_badblock(&rdev->badblocks, rdev->data_offset + s,
sectors,
first_bad, bad_sectors);
if (rv)
*first_bad -= rdev->data_offset;
return rv;
}
return 0;
}
extern int rdev_set_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors,
int acknowledged);
extern int rdev_clear_badblocks(mdk_rdev_t *rdev, sector_t s, int sectors);
extern void md_ack_all_badblocks(struct badblocks *bb);
struct mddev_s
{
void *private;
@ -239,9 +312,12 @@ struct mddev_s
#define MD_RECOVERY_FROZEN 9
unsigned long recovery;
int recovery_disabled; /* if we detect that recovery
* will always fail, set this
* so we don't loop trying */
/* If a RAID personality determines that recovery (of a particular
* device) will fail due to a read error on the source device, it
* takes a copy of this number and does not attempt recovery again
* until this number changes.
*/
int recovery_disabled;
int in_sync; /* know to not need resync */
/* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so
@ -304,11 +380,6 @@ struct mddev_s
* hot-adding a bitmap. It should
* eventually be settable by sysfs.
*/
/* When md is serving under dm, it might use a
* dirty_log to store the bits.
*/
struct dm_dirty_log *log;
struct mutex mutex;
unsigned long chunksize;
unsigned long daemon_sleep; /* how many jiffies between updates? */
@ -413,6 +484,20 @@ static inline char * mdname (mddev_t * mddev)
return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
}
static inline int sysfs_link_rdev(mddev_t *mddev, mdk_rdev_t *rdev)
{
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm);
}
static inline void sysfs_unlink_rdev(mddev_t *mddev, mdk_rdev_t *rdev)
{
char nm[20];
sprintf(nm, "rd%d", rdev->raid_disk);
sysfs_remove_link(&mddev->kobj, nm);
}
/*
* iterates through some rdev ringlist. It's safe to remove the
* current 'rdev'. Dont touch 'tmp' though.
@ -505,7 +590,7 @@ extern void mddev_init(mddev_t *mddev);
extern int md_run(mddev_t *mddev);
extern void md_stop(mddev_t *mddev);
extern void md_stop_writes(mddev_t *mddev);
extern void md_rdev_init(mdk_rdev_t *rdev);
extern int md_rdev_init(mdk_rdev_t *rdev);
extern void mddev_suspend(mddev_t *mddev);
extern void mddev_resume(mddev_t *mddev);
@ -514,4 +599,5 @@ extern struct bio *bio_clone_mddev(struct bio *bio, gfp_t gfp_mask,
extern struct bio *bio_alloc_mddev(gfp_t gfp_mask, int nr_iovecs,
mddev_t *mddev);
extern int mddev_check_plugged(mddev_t *mddev);
extern void md_trim_bio(struct bio *bio, int offset, int size);
#endif /* _MD_MD_H */

958
drivers/md/raid1.c
View file

File diff suppressed because it is too large Load diff

26
drivers/md/raid1.h
View file

@ -48,6 +48,12 @@ struct r1_private_data_s {
* (fresh device added).
* Cleared when a sync completes.
*/
int recovery_disabled; /* when the same as
* mddev->recovery_disabled
* we don't allow recovery
* to be attempted as we
* expect a read error
*/
wait_queue_head_t wait_barrier;
@ -95,7 +101,7 @@ struct r1bio_s {
struct list_head retry_list;
/* Next two are only valid when R1BIO_BehindIO is set */
struct page **behind_pages;
struct bio_vec *behind_bvecs;
int behind_page_count;
/*
* if the IO is in WRITE direction, then multiple bios are used.
@ -110,13 +116,24 @@ struct r1bio_s {
* correct the read error. To keep track of bad blocks on a per-bio
* level, we store IO_BLOCKED in the appropriate 'bios' pointer
*/
#define IO_BLOCKED ((struct bio*)1)
#define IO_BLOCKED ((struct bio *)1)
/* When we successfully write to a known bad-block, we need to remove the
* bad-block marking which must be done from process context. So we record
* the success by setting bios[n] to IO_MADE_GOOD
*/
#define IO_MADE_GOOD ((struct bio *)2)
#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
/* bits for r1bio.state */
#define R1BIO_Uptodate 0
#define R1BIO_IsSync 1
#define R1BIO_Degraded 2
#define R1BIO_BehindIO 3
/* Set ReadError on bios that experience a readerror so that
* raid1d knows what to do with them.
*/
#define R1BIO_ReadError 4
/* For write-behind requests, we call bi_end_io when
* the last non-write-behind device completes, providing
* any write was successful. Otherwise we call when
@ -125,6 +142,11 @@ struct r1bio_s {
* Record that bi_end_io was called with this flag...
*/
#define R1BIO_Returned 6
/* If a write for this request means we can clear some
* known-bad-block records, we set this flag
*/
#define R1BIO_MadeGood 7
#define R1BIO_WriteError 8
extern int md_raid1_congested(mddev_t *mddev, int bits);

1191
drivers/md/raid10.c
View file

File diff suppressed because it is too large Load diff

21
drivers/md/raid10.h
View file

@ -6,6 +6,11 @@ typedef struct mirror_info mirror_info_t;
struct mirror_info {
mdk_rdev_t *rdev;
sector_t head_position;
int recovery_disabled; /* matches
* mddev->recovery_disabled
* when we shouldn't try
* recovering this device.
*/
};
typedef struct r10bio_s r10bio_t;
@ -113,10 +118,26 @@ struct r10bio_s {
* level, we store IO_BLOCKED in the appropriate 'bios' pointer
*/
#define IO_BLOCKED ((struct bio*)1)
/* When we successfully write to a known bad-block, we need to remove the
* bad-block marking which must be done from process context. So we record
* the success by setting devs[n].bio to IO_MADE_GOOD
*/
#define IO_MADE_GOOD ((struct bio *)2)
#define BIO_SPECIAL(bio) ((unsigned long)bio <= 2)
/* bits for r10bio.state */
#define R10BIO_Uptodate 0
#define R10BIO_IsSync 1
#define R10BIO_IsRecover 2
#define R10BIO_Degraded 3
/* Set ReadError on bios that experience a read error
* so that raid10d knows what to do with them.
*/
#define R10BIO_ReadError 4
/* If a write for this request means we can clear some
* known-bad-block records, we set this flag.
*/
#define R10BIO_MadeGood 5
#define R10BIO_WriteError 6
#endif

1059
drivers/md/raid5.c
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File diff suppressed because it is too large Load diff

99
drivers/md/raid5.h
View file

@ -6,11 +6,11 @@
/*
*
* Each stripe contains one buffer per disc. Each buffer can be in
* Each stripe contains one buffer per device. Each buffer can be in
* one of a number of states stored in "flags". Changes between
* these states happen *almost* exclusively under a per-stripe
* spinlock. Some very specific changes can happen in bi_end_io, and
* these are not protected by the spin lock.
* these states happen *almost* exclusively under the protection of the
* STRIPE_ACTIVE flag. Some very specific changes can happen in bi_end_io, and
* these are not protected by STRIPE_ACTIVE.
*
* The flag bits that are used to represent these states are:
* R5_UPTODATE and R5_LOCKED
@ -76,12 +76,10 @@
* block and the cached buffer are successfully written, any buffer on
* a written list can be returned with b_end_io.
*
* The write list and read list both act as fifos. The read list is
* protected by the device_lock. The write and written lists are
* protected by the stripe lock. The device_lock, which can be
* claimed while the stipe lock is held, is only for list
* manipulations and will only be held for a very short time. It can
* be claimed from interrupts.
* The write list and read list both act as fifos. The read list,
* write list and written list are protected by the device_lock.
* The device_lock is only for list manipulations and will only be
* held for a very short time. It can be claimed from interrupts.
*
*
* Stripes in the stripe cache can be on one of two lists (or on
@ -96,7 +94,6 @@
*
* The inactive_list, handle_list and hash bucket lists are all protected by the
* device_lock.
* - stripes on the inactive_list never have their stripe_lock held.
* - stripes have a reference counter. If count==0, they are on a list.
* - If a stripe might need handling, STRIPE_HANDLE is set.
* - When refcount reaches zero, then if STRIPE_HANDLE it is put on
@ -116,10 +113,10 @@
* attach a request to an active stripe (add_stripe_bh())
* lockdev attach-buffer unlockdev
* handle a stripe (handle_stripe())
* lockstripe clrSTRIPE_HANDLE ...
* setSTRIPE_ACTIVE, clrSTRIPE_HANDLE ...
* (lockdev check-buffers unlockdev) ..
* change-state ..
* record io/ops needed unlockstripe schedule io/ops
* record io/ops needed clearSTRIPE_ACTIVE schedule io/ops
* release an active stripe (release_stripe())
* lockdev if (!--cnt) { if STRIPE_HANDLE, add to handle_list else add to inactive-list } unlockdev
*
@ -128,8 +125,7 @@
* on a cached buffer, and plus one if the stripe is undergoing stripe
* operations.
*
* Stripe operations are performed outside the stripe lock,
* the stripe operations are:
* The stripe operations are:
* -copying data between the stripe cache and user application buffers
* -computing blocks to save a disk access, or to recover a missing block
* -updating the parity on a write operation (reconstruct write and
@ -159,7 +155,8 @@
*/
/*
* Operations state - intermediate states that are visible outside of sh->lock
* Operations state - intermediate states that are visible outside of
* STRIPE_ACTIVE.
* 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
@ -209,7 +206,6 @@ struct stripe_head {
short ddf_layout;/* use DDF ordering to calculate Q */
unsigned long state; /* state flags */
atomic_t count; /* nr of active thread/requests */
spinlock_t lock;
int bm_seq; /* sequence number for bitmap flushes */
int disks; /* disks in stripe */
enum check_states check_state;
@ -240,19 +236,20 @@ struct stripe_head {
};
/* stripe_head_state - collects and tracks the dynamic state of a stripe_head
* for handle_stripe. It is only valid under spin_lock(sh->lock);
* for handle_stripe.
*/
struct stripe_head_state {
int syncing, expanding, expanded;
int locked, uptodate, to_read, to_write, failed, written;
int to_fill, compute, req_compute, non_overwrite;
int failed_num;
int failed_num[2];
int p_failed, q_failed;
int dec_preread_active;
unsigned long ops_request;
};
/* r6_state - extra state data only relevant to r6 */
struct r6_state {
int p_failed, q_failed, failed_num[2];
struct bio *return_bi;
mdk_rdev_t *blocked_rdev;
int handle_bad_blocks;
};
/* Flags */
@ -268,14 +265,16 @@ struct r6_state {
#define R5_ReWrite 9 /* have tried to over-write the readerror */
#define R5_Expanded 10 /* This block now has post-expand data */
#define R5_Wantcompute 11 /* compute_block in progress treat as
* uptodate
*/
#define R5_Wantfill 12 /* dev->toread contains a bio that needs
* filling
*/
#define R5_Wantdrain 13 /* dev->towrite needs to be drained */
#define R5_WantFUA 14 /* Write should be FUA */
#define R5_Wantcompute 11 /* compute_block in progress treat as
* uptodate
*/
#define R5_Wantfill 12 /* dev->toread contains a bio that needs
* filling
*/
#define R5_Wantdrain 13 /* dev->towrite needs to be drained */
#define R5_WantFUA 14 /* Write should be FUA */
#define R5_WriteError 15 /* got a write error - need to record it */
#define R5_MadeGood 16 /* A bad block has been fixed by writing to it*/
/*
* Write method
*/
@ -289,21 +288,25 @@ struct r6_state {
/*
* Stripe state
*/
#define STRIPE_HANDLE 2
#define STRIPE_SYNCING 3
#define STRIPE_INSYNC 4
#define STRIPE_PREREAD_ACTIVE 5
#define STRIPE_DELAYED 6
#define STRIPE_DEGRADED 7
#define STRIPE_BIT_DELAY 8
#define STRIPE_EXPANDING 9
#define STRIPE_EXPAND_SOURCE 10
#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
#define STRIPE_OPS_REQ_PENDING 16
enum {
STRIPE_ACTIVE,
STRIPE_HANDLE,
STRIPE_SYNC_REQUESTED,
STRIPE_SYNCING,
STRIPE_INSYNC,
STRIPE_PREREAD_ACTIVE,
STRIPE_DELAYED,
STRIPE_DEGRADED,
STRIPE_BIT_DELAY,
STRIPE_EXPANDING,
STRIPE_EXPAND_SOURCE,
STRIPE_EXPAND_READY,
STRIPE_IO_STARTED, /* do not count towards 'bypass_count' */
STRIPE_FULL_WRITE, /* all blocks are set to be overwritten */
STRIPE_BIOFILL_RUN,
STRIPE_COMPUTE_RUN,
STRIPE_OPS_REQ_PENDING,
};
/*
* Operation request flags
@ -336,7 +339,7 @@ struct r6_state {
* PREREAD_ACTIVE.
* In stripe_handle, if we find pre-reading is necessary, we do it if
* PREREAD_ACTIVE is set, else we set DELAYED which will send it to the delayed queue.
* HANDLE gets cleared if stripe_handle leave nothing locked.
* HANDLE gets cleared if stripe_handle leaves nothing locked.
*/
@ -399,7 +402,7 @@ struct raid5_private_data {
* (fresh device added).
* Cleared when a sync completes.
*/
int recovery_disabled;
/* per cpu variables */
struct raid5_percpu {
struct page *spare_page; /* Used when checking P/Q in raid6 */