diff options
| -rw-r--r-- | Documentation/md.txt | 22 | ||||
| -rw-r--r-- | drivers/md/md.c | 55 | ||||
| -rw-r--r-- | drivers/md/md.h | 80 | ||||
| -rw-r--r-- | include/linux/raid/md_p.h | 7 |
4 files changed, 125 insertions, 39 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt index fc94770..993fba3 100644 --- a/Documentation/md.txt +++ b/Documentation/md.txt @@ -357,14 +357,14 @@ Each directory contains: written to, that device. state - A file recording the current state of the device in the array + A file recording the current state of the device in the array which can be a comma separated list of faulty - device has been kicked from active use due to - a detected fault or it has unacknowledged bad - blocks + a detected fault, or it has unacknowledged bad + blocks in_sync - device is a fully in-sync member of the array writemostly - device will only be subject to read - requests if there are no other options. + requests if there are no other options. This applies only to raid1 arrays. blocked - device has failed, and the failure hasn't been acknowledged yet by the metadata handler. @@ -374,6 +374,13 @@ Each directory contains: This includes spares that are in the process of being recovered to write_error - device has ever seen a write error. + want_replacement - device is (mostly) working but probably + should be replaced, either due to errors or + due to user request. + replacement - device is a replacement for another active + device with same raid_disk. + + This list may grow in future. This can be written to. Writing "faulty" simulates a failure on the device. @@ -386,6 +393,13 @@ Each directory contains: Writing "in_sync" sets the in_sync flag. Writing "write_error" sets writeerrorseen flag. Writing "-write_error" clears writeerrorseen flag. + Writing "want_replacement" is allowed at any time except to a + replacement device or a spare. It sets the flag. + Writing "-want_replacement" is allowed at any time. It clears + the flag. + Writing "replacement" or "-replacement" is only allowed before + starting the array. It sets or clears the flag. + This file responds to select/poll. Any change to 'faulty' or 'blocked' causes an event. diff --git a/drivers/md/md.c b/drivers/md/md.c index 0e22888..be569eb 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -1714,6 +1714,8 @@ static int super_1_validate(struct mddev *mddev, struct md_rdev *rdev) } if (sb->devflags & WriteMostly1) set_bit(WriteMostly, &rdev->flags); + if (le32_to_cpu(sb->feature_map) & MD_FEATURE_REPLACEMENT) + set_bit(Replacement, &rdev->flags); } else /* MULTIPATH are always insync */ set_bit(In_sync, &rdev->flags); @@ -1767,6 +1769,9 @@ static void super_1_sync(struct mddev *mddev, struct md_rdev *rdev) sb->recovery_offset = cpu_to_le64(rdev->recovery_offset); } + if (test_bit(Replacement, &rdev->flags)) + sb->feature_map |= + cpu_to_le32(MD_FEATURE_REPLACEMENT); if (mddev->reshape_position != MaxSector) { sb->feature_map |= cpu_to_le32(MD_FEATURE_RESHAPE_ACTIVE); @@ -2560,6 +2565,15 @@ state_show(struct md_rdev *rdev, char *page) len += sprintf(page+len, "%swrite_error", sep); sep = ","; } + if (test_bit(WantReplacement, &rdev->flags)) { + len += sprintf(page+len, "%swant_replacement", sep); + sep = ","; + } + if (test_bit(Replacement, &rdev->flags)) { + len += sprintf(page+len, "%sreplacement", sep); + sep = ","; + } + return len+sprintf(page+len, "\n"); } @@ -2628,6 +2642,42 @@ state_store(struct md_rdev *rdev, const char *buf, size_t len) } else if (cmd_match(buf, "-write_error")) { clear_bit(WriteErrorSeen, &rdev->flags); err = 0; + } else if (cmd_match(buf, "want_replacement")) { + /* Any non-spare device that is not a replacement can + * become want_replacement at any time, but we then need to + * check if recovery is needed. + */ + if (rdev->raid_disk >= 0 && + !test_bit(Replacement, &rdev->flags)) + set_bit(WantReplacement, &rdev->flags); + set_bit(MD_RECOVERY_NEEDED, &rdev->mddev->recovery); + md_wakeup_thread(rdev->mddev->thread); + err = 0; + } else if (cmd_match(buf, "-want_replacement")) { + /* Clearing 'want_replacement' is always allowed. + * Once replacements starts it is too late though. + */ + err = 0; + clear_bit(WantReplacement, &rdev->flags); + } else if (cmd_match(buf, "replacement")) { + /* Can only set a device as a replacement when array has not + * yet been started. Once running, replacement is automatic + * from spares, or by assigning 'slot'. + */ + if (rdev->mddev->pers) + err = -EBUSY; + else { + set_bit(Replacement, &rdev->flags); + err = 0; + } + } else if (cmd_match(buf, "-replacement")) { + /* Similarly, can only clear Replacement before start */ + if (rdev->mddev->pers) + err = -EBUSY; + else { + clear_bit(Replacement, &rdev->flags); + err = 0; + } } if (!err) sysfs_notify_dirent_safe(rdev->sysfs_state); @@ -6717,8 +6767,11 @@ static int md_seq_show(struct seq_file *seq, void *v) if (test_bit(Faulty, &rdev->flags)) { seq_printf(seq, "(F)"); continue; - } else if (rdev->raid_disk < 0) + } + if (rdev->raid_disk < 0) seq_printf(seq, "(S)"); /* spare */ + if (test_bit(Replacement, &rdev->flags)) + seq_printf(seq, "(R)"); sectors += rdev->sectors; } diff --git a/drivers/md/md.h b/drivers/md/md.h index 670c10e6..44c63df 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -72,34 +72,7 @@ struct md_rdev { * This reduces the burden of testing multiple flags in many cases */ - unsigned long flags; -#define Faulty 1 /* device is known to have a fault */ -#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 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. - */ + unsigned long flags; /* bit set of 'enum flag_bits' bits. */ wait_queue_head_t blocked_wait; int desc_nr; /* descriptor index in the superblock */ @@ -152,6 +125,44 @@ struct md_rdev { sector_t size; /* in sectors */ } badblocks; }; +enum flag_bits { + Faulty, /* device is known to have a fault */ + In_sync, /* device is in_sync with rest of array */ + WriteMostly, /* Avoid reading if at all possible */ + AutoDetected, /* added by auto-detect */ + Blocked, /* An error occurred but has not yet + * been acknowledged by the metadata + * handler, so don't allow writes + * until it is cleared */ + WriteErrorSeen, /* A write error has been seen on this + * device + */ + FaultRecorded, /* 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. + */ + BlockedBadBlocks, /* 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. + */ + WantReplacement, /* This device is a candidate to be + * hot-replaced, either because it has + * reported some faults, or because + * of explicit request. + */ + Replacement, /* This device is a replacement for + * a want_replacement device with same + * raid_disk number. + */ +}; #define BB_LEN_MASK (0x00000000000001FFULL) #define BB_OFFSET_MASK (0x7FFFFFFFFFFFFE00ULL) @@ -482,15 +493,20 @@ static inline char * mdname (struct mddev * mddev) static inline int sysfs_link_rdev(struct mddev *mddev, struct md_rdev *rdev) { char nm[20]; - sprintf(nm, "rd%d", rdev->raid_disk); - return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); + if (!test_bit(Replacement, &rdev->flags)) { + sprintf(nm, "rd%d", rdev->raid_disk); + return sysfs_create_link(&mddev->kobj, &rdev->kobj, nm); + } else + return 0; } static inline void sysfs_unlink_rdev(struct mddev *mddev, struct md_rdev *rdev) { char nm[20]; - sprintf(nm, "rd%d", rdev->raid_disk); - sysfs_remove_link(&mddev->kobj, nm); + if (!test_bit(Replacement, &rdev->flags)) { + sprintf(nm, "rd%d", rdev->raid_disk); + sysfs_remove_link(&mddev->kobj, nm); + } } /* diff --git a/include/linux/raid/md_p.h b/include/linux/raid/md_p.h index 9e65d9e..6f6df86 100644 --- a/include/linux/raid/md_p.h +++ b/include/linux/raid/md_p.h @@ -277,7 +277,10 @@ struct mdp_superblock_1 { */ #define MD_FEATURE_RESHAPE_ACTIVE 4 #define MD_FEATURE_BAD_BLOCKS 8 /* badblock list is not empty */ - -#define MD_FEATURE_ALL (1|2|4|8) +#define MD_FEATURE_REPLACEMENT 16 /* This device is replacing an + * active device with same 'role'. + * 'recovery_offset' is also set. + */ +#define MD_FEATURE_ALL (1|2|4|8|16) #endif |
