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-rw-r--r--drivers/md/raid5.h98
1 files changed, 55 insertions, 43 deletions
diff --git a/drivers/md/raid5.h b/drivers/md/raid5.h
index e10c5531f9c..8d8e13934a4 100644
--- a/drivers/md/raid5.h
+++ b/drivers/md/raid5.h
@@ -27,7 +27,7 @@
* The possible state transitions are:
*
* Empty -> Want - on read or write to get old data for parity calc
- * Empty -> Dirty - on compute_parity to satisfy write/sync request.(RECONSTRUCT_WRITE)
+ * Empty -> Dirty - on compute_parity to satisfy write/sync request.
* Empty -> Clean - on compute_block when computing a block for failed drive
* Want -> Empty - on failed read
* Want -> Clean - on successful completion of read request
@@ -226,8 +226,11 @@ struct stripe_head {
#endif
} ops;
struct r5dev {
- struct bio req;
- struct bio_vec vec;
+ /* rreq and rvec are used for the replacement device when
+ * writing data to both devices.
+ */
+ struct bio req, rreq;
+ struct bio_vec vec, rvec;
struct page *page;
struct bio *toread, *read, *towrite, *written;
sector_t sector; /* sector of this page */
@@ -239,7 +242,13 @@ struct stripe_head {
* for handle_stripe.
*/
struct stripe_head_state {
- int syncing, expanding, expanded;
+ /* 'syncing' means that we need to read all devices, either
+ * to check/correct parity, or to reconstruct a missing device.
+ * 'replacing' means we are replacing one or more drives and
+ * the source is valid at this point so we don't need to
+ * read all devices, just the replacement targets.
+ */
+ int syncing, expanding, expanded, replacing;
int locked, uptodate, to_read, to_write, failed, written;
int to_fill, compute, req_compute, non_overwrite;
int failed_num[2];
@@ -252,38 +261,41 @@ struct stripe_head_state {
int handle_bad_blocks;
};
-/* Flags */
-#define R5_UPTODATE 0 /* page contains current data */
-#define R5_LOCKED 1 /* IO has been submitted on "req" */
-#define R5_OVERWRITE 2 /* towrite covers whole page */
+/* Flags for struct r5dev.flags */
+enum r5dev_flags {
+ R5_UPTODATE, /* page contains current data */
+ R5_LOCKED, /* IO has been submitted on "req" */
+ R5_DOUBLE_LOCKED,/* Cannot clear R5_LOCKED until 2 writes complete */
+ R5_OVERWRITE, /* towrite covers whole page */
/* and some that are internal to handle_stripe */
-#define R5_Insync 3 /* rdev && rdev->in_sync at start */
-#define R5_Wantread 4 /* want to schedule a read */
-#define R5_Wantwrite 5
-#define R5_Overlap 7 /* There is a pending overlapping request on this block */
-#define R5_ReadError 8 /* seen a read error here recently */
-#define R5_ReWrite 9 /* have tried to over-write the readerror */
+ R5_Insync, /* rdev && rdev->in_sync at start */
+ R5_Wantread, /* want to schedule a read */
+ R5_Wantwrite,
+ R5_Overlap, /* There is a pending overlapping request
+ * on this block */
+ R5_ReadError, /* seen a read error here recently */
+ R5_ReWrite, /* 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_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
- */
-#define RECONSTRUCT_WRITE 1
-#define READ_MODIFY_WRITE 2
-/* not a write method, but a compute_parity mode */
-#define CHECK_PARITY 3
-/* Additional compute_parity mode -- updates the parity w/o LOCKING */
-#define UPDATE_PARITY 4
+ R5_Expanded, /* This block now has post-expand data */
+ R5_Wantcompute, /* compute_block in progress treat as
+ * uptodate
+ */
+ R5_Wantfill, /* dev->toread contains a bio that needs
+ * filling
+ */
+ R5_Wantdrain, /* dev->towrite needs to be drained */
+ R5_WantFUA, /* Write should be FUA */
+ R5_WriteError, /* got a write error - need to record it */
+ R5_MadeGood, /* A bad block has been fixed by writing to it */
+ R5_ReadRepl, /* Will/did read from replacement rather than orig */
+ R5_MadeGoodRepl,/* A bad block on the replacement device has been
+ * fixed by writing to it */
+ R5_NeedReplace, /* This device has a replacement which is not
+ * up-to-date at this stripe. */
+ R5_WantReplace, /* We need to update the replacement, we have read
+ * data in, and now is a good time to write it out.
+ */
+};
/*
* Stripe state
@@ -311,13 +323,14 @@ enum {
/*
* Operation request flags
*/
-#define STRIPE_OP_BIOFILL 0
-#define STRIPE_OP_COMPUTE_BLK 1
-#define STRIPE_OP_PREXOR 2
-#define STRIPE_OP_BIODRAIN 3
-#define STRIPE_OP_RECONSTRUCT 4
-#define STRIPE_OP_CHECK 5
-
+enum {
+ STRIPE_OP_BIOFILL,
+ STRIPE_OP_COMPUTE_BLK,
+ STRIPE_OP_PREXOR,
+ STRIPE_OP_BIODRAIN,
+ STRIPE_OP_RECONSTRUCT,
+ STRIPE_OP_CHECK,
+};
/*
* Plugging:
*
@@ -344,13 +357,12 @@ enum {
struct disk_info {
- struct md_rdev *rdev;
+ struct md_rdev *rdev, *replacement;
};
struct r5conf {
struct hlist_head *stripe_hashtbl;
struct mddev *mddev;
- struct disk_info *spare;
int chunk_sectors;
int level, algorithm;
int max_degraded;