4 typedef struct mirror_info mirror_info_t;
8 sector_t head_position;
12 * memory pools need a pointer to the mddev, so they can force an unplug
13 * when memory is tight, and a count of the number of drives that the
14 * pool was allocated for, so they know how much to allocate and free.
15 * mddev->raid_disks cannot be used, as it can change while a pool is active
16 * These two datums are stored in a kmalloced struct.
25 typedef struct r1bio_s r1bio_t;
27 struct r1_private_data_s {
29 mirror_info_t *mirrors;
32 sector_t next_seq_sect;
33 spinlock_t device_lock;
35 struct list_head retry_list;
36 /* queue pending writes and submit them on unplug */
37 struct bio_list pending_bio_list;
39 /* for use when syncing mirrors: */
41 spinlock_t resync_lock;
47 int fullsync; /* set to 1 if a full sync is needed,
48 * (fresh device added).
49 * Cleared when a sync completes.
51 int recovery_disabled; /* when the same as
52 * mddev->recovery_disabled
53 * we don't allow recovery
54 * to be attempted as we
58 wait_queue_head_t wait_barrier;
60 struct pool_info *poolinfo;
64 mempool_t *r1bio_pool;
65 mempool_t *r1buf_pool;
67 /* When taking over an array from a different personality, we store
68 * the new thread here until we fully activate the array.
70 struct mdk_thread_s *thread;
73 typedef struct r1_private_data_s conf_t;
76 * this is our 'private' RAID1 bio.
78 * it contains information about what kind of IO operations were started
79 * for this RAID1 operation, and about their status:
83 atomic_t remaining; /* 'have we finished' count,
84 * used from IRQ handlers
86 atomic_t behind_remaining; /* number of write-behind ios remaining
87 * in this BehindIO request
94 * original bio going to /dev/mdx
96 struct bio *master_bio;
98 * if the IO is in READ direction, then this is where we read
102 struct list_head retry_list;
103 /* Next two are only valid when R1BIO_BehindIO is set */
104 struct page **behind_pages;
105 int behind_page_count;
107 * if the IO is in WRITE direction, then multiple bios are used.
108 * We choose the number when they are allocated.
111 /* DO NOT PUT ANY NEW FIELDS HERE - bios array is contiguously alloced*/
114 /* when we get a read error on a read-only array, we redirect to another
115 * device without failing the first device, or trying to over-write to
116 * correct the read error. To keep track of bad blocks on a per-bio
117 * level, we store IO_BLOCKED in the appropriate 'bios' pointer
119 #define IO_BLOCKED ((struct bio*)1)
121 /* bits for r1bio.state */
122 #define R1BIO_Uptodate 0
123 #define R1BIO_IsSync 1
124 #define R1BIO_Degraded 2
125 #define R1BIO_BehindIO 3
126 /* Set ReadError on bios that experience a readerror so that
127 * raid1d knows what to do with them.
129 #define R1BIO_ReadError 4
130 /* For write-behind requests, we call bi_end_io when
131 * the last non-write-behind device completes, providing
132 * any write was successful. Otherwise we call when
133 * any write-behind write succeeds, otherwise we call
134 * with failure when last write completes (and all failed).
135 * Record that bi_end_io was called with this flag...
137 #define R1BIO_Returned 6
139 extern int md_raid1_congested(mddev_t *mddev, int bits);