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0001 /* SPDX-License-Identifier: GPL-2.0 */ 0002 #ifndef _RAID10_H 0003 #define _RAID10_H 0004 0005 /* Note: raid10_info.rdev can be set to NULL asynchronously by 0006 * raid10_remove_disk. 0007 * There are three safe ways to access raid10_info.rdev. 0008 * 1/ when holding mddev->reconfig_mutex 0009 * 2/ when resync/recovery/reshape is known to be happening - i.e. in code 0010 * that is called as part of performing resync/recovery/reshape. 0011 * 3/ while holding rcu_read_lock(), use rcu_dereference to get the pointer 0012 * and if it is non-NULL, increment rdev->nr_pending before dropping the 0013 * RCU lock. 0014 * When .rdev is set to NULL, the nr_pending count checked again and if it has 0015 * been incremented, the pointer is put back in .rdev. 0016 */ 0017 0018 struct raid10_info { 0019 struct md_rdev *rdev, *replacement; 0020 sector_t head_position; 0021 int recovery_disabled; /* matches 0022 * mddev->recovery_disabled 0023 * when we shouldn't try 0024 * recovering this device. 0025 */ 0026 }; 0027 0028 struct r10conf { 0029 struct mddev *mddev; 0030 struct raid10_info *mirrors; 0031 struct raid10_info *mirrors_new, *mirrors_old; 0032 spinlock_t device_lock; 0033 0034 /* geometry */ 0035 struct geom { 0036 int raid_disks; 0037 int near_copies; /* number of copies laid out 0038 * raid0 style */ 0039 int far_copies; /* number of copies laid out 0040 * at large strides across drives 0041 */ 0042 int far_offset; /* far_copies are offset by 1 0043 * stripe instead of many 0044 */ 0045 sector_t stride; /* distance between far copies. 0046 * This is size / far_copies unless 0047 * far_offset, in which case it is 0048 * 1 stripe. 0049 */ 0050 int far_set_size; /* The number of devices in a set, 0051 * where a 'set' are devices that 0052 * contain far/offset copies of 0053 * each other. 0054 */ 0055 int chunk_shift; /* shift from chunks to sectors */ 0056 sector_t chunk_mask; 0057 } prev, geo; 0058 int copies; /* near_copies * far_copies. 0059 * must be <= raid_disks 0060 */ 0061 0062 sector_t dev_sectors; /* temp copy of 0063 * mddev->dev_sectors */ 0064 sector_t reshape_progress; 0065 sector_t reshape_safe; 0066 unsigned long reshape_checkpoint; 0067 sector_t offset_diff; 0068 0069 struct list_head retry_list; 0070 /* A separate list of r1bio which just need raid_end_bio_io called. 0071 * This mustn't happen for writes which had any errors if the superblock 0072 * needs to be written. 0073 */ 0074 struct list_head bio_end_io_list; 0075 0076 /* queue pending writes and submit them on unplug */ 0077 struct bio_list pending_bio_list; 0078 0079 spinlock_t resync_lock; 0080 atomic_t nr_pending; 0081 int nr_waiting; 0082 int nr_queued; 0083 int barrier; 0084 int array_freeze_pending; 0085 sector_t next_resync; 0086 int fullsync; /* set to 1 if a full sync is needed, 0087 * (fresh device added). 0088 * Cleared when a sync completes. 0089 */ 0090 int have_replacement; /* There is at least one 0091 * replacement device. 0092 */ 0093 wait_queue_head_t wait_barrier; 0094 0095 mempool_t r10bio_pool; 0096 mempool_t r10buf_pool; 0097 struct page *tmppage; 0098 struct bio_set bio_split; 0099 0100 /* When taking over an array from a different personality, we store 0101 * the new thread here until we fully activate the array. 0102 */ 0103 struct md_thread *thread; 0104 0105 /* 0106 * Keep track of cluster resync window to send to other nodes. 0107 */ 0108 sector_t cluster_sync_low; 0109 sector_t cluster_sync_high; 0110 }; 0111 0112 /* 0113 * this is our 'private' RAID10 bio. 0114 * 0115 * it contains information about what kind of IO operations were started 0116 * for this RAID10 operation, and about their status: 0117 */ 0118 0119 struct r10bio { 0120 atomic_t remaining; /* 'have we finished' count, 0121 * used from IRQ handlers 0122 */ 0123 sector_t sector; /* virtual sector number */ 0124 int sectors; 0125 unsigned long state; 0126 unsigned long start_time; 0127 struct mddev *mddev; 0128 /* 0129 * original bio going to /dev/mdx 0130 */ 0131 struct bio *master_bio; 0132 /* 0133 * if the IO is in READ direction, then this is where we read 0134 */ 0135 int read_slot; 0136 0137 struct list_head retry_list; 0138 /* 0139 * if the IO is in WRITE direction, then multiple bios are used, 0140 * one for each copy. 0141 * When resyncing we also use one for each copy. 0142 * When reconstructing, we use 2 bios, one for read, one for write. 0143 * We choose the number when they are allocated. 0144 * We sometimes need an extra bio to write to the replacement. 0145 */ 0146 struct r10dev { 0147 struct bio *bio; 0148 union { 0149 struct bio *repl_bio; /* used for resync and 0150 * writes */ 0151 struct md_rdev *rdev; /* used for reads 0152 * (read_slot >= 0) */ 0153 }; 0154 sector_t addr; 0155 int devnum; 0156 } devs[]; 0157 }; 0158 0159 /* bits for r10bio.state */ 0160 enum r10bio_state { 0161 R10BIO_Uptodate, 0162 R10BIO_IsSync, 0163 R10BIO_IsRecover, 0164 R10BIO_IsReshape, 0165 R10BIO_Degraded, 0166 /* Set ReadError on bios that experience a read error 0167 * so that raid10d knows what to do with them. 0168 */ 0169 R10BIO_ReadError, 0170 /* If a write for this request means we can clear some 0171 * known-bad-block records, we set this flag. 0172 */ 0173 R10BIO_MadeGood, 0174 R10BIO_WriteError, 0175 /* During a reshape we might be performing IO on the 0176 * 'previous' part of the array, in which case this 0177 * flag is set 0178 */ 0179 R10BIO_Previous, 0180 /* failfast devices did receive failfast requests. */ 0181 R10BIO_FailFast, 0182 R10BIO_Discard, 0183 }; 0184 #endif
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