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bcache-tools.18423
0023-bcache-tools-introduce-BCH_FEATURE_INCOMPA...
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File 0023-bcache-tools-introduce-BCH_FEATURE_INCOMPAT_LOG_LARG.patch of Package bcache-tools.18423
From c0b421f3b5e4479a6f8f25b7cddf53cd240a0a7e Mon Sep 17 00:00:00 2001 From: Coly Li <colyli@suse.de> Date: Fri, 1 Jan 2021 00:16:34 +0800 Subject: [PATCH 5/9] bcache-tools: introduce BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE for large bucket Git-commit: c0b421f3b5e4479a6f8f25b7cddf53cd240a0a7e References: jsc#SLE-9807 When large bucket feature was added, BCH_FEATURE_INCOMPAT_LARGE_BUCKET was introduced into incompat feature set. It indicates bucket_size_hi is added at the tail of struct cache_sb_disk, to extend current 16bit bucket size to 32bit with existing bucket_size in struct cache_sb_disk. This is not a good idea, there are two obvious problems, - Bucket size is always value power of 2, if store log2(bucket size) in existing bucket_size of struct cache_sb_disk, it is unnecessary to add bucket_size_hi. - Macro csum_set() assumes d[SB_JOURNAL_BUCKETS] is the last member in struct cache_sb_disk, bucket_size_hi was added after d[] which makes csum_set calculate an unexpected super block checksum. To fix the above problems, this patch introduces a new incompat feature bit BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE, when this bit is set, it means bucket_size in struct cache_sb_disk stores the order of power of 2 bucket size value. When user specifies a bucket size larger than 32768 sectors, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE will be set to incompat feature set, and bucket_size stores log2(bucket size) more than store the real bucket size value. The obsoleted BCH_FEATURE_INCOMPAT_LARGE_BUCKET won't be used anymore, bcache-tools only display "obso_large_bucket" for cache device created with BCH_FEATURE_INCOMPAT_LARGE_BUCKET, kernel driver will make bcache device as read-only if BCH_FEATURE_INCOMPAT_LARGE_BUCKET is set. With this change, the unnecessary extra space extend of bcache on-disk super block can be avoided, and csum_set() may generate expected check sum as well. Fixes: 8c063851990a ("bcache-tools: add large_bucket incompat feature") Signed-off-by: Coly Li <colyli@suse.de> --- bcache.h | 13 +++++++++---- features.c | 4 +++- lib.c | 17 +++++++++++++++-- lib.h | 2 +- 4 files changed, 28 insertions(+), 8 deletions(-) diff --git a/bcache.h b/bcache.h index 58e973c..6dcdbb7 100644 --- a/bcache.h +++ b/bcache.h @@ -100,7 +100,7 @@ struct cache_sb_disk { __le16 keys; }; __le64 d[SB_JOURNAL_BUCKETS]; /* journal buckets */ - __le16 bucket_size_hi; + __le16 obso_bucket_size_hi; /* obsoleted */ }; /* @@ -202,7 +202,8 @@ uint64_t crc64(const void *data, size_t len); #define BCH_FEATURE_COMPAT_SUPP 0 #define BCH_FEATURE_RO_COMPAT_SUPP 0 -#define BCH_FEATURE_INCOMPAT_SUPP BCH_FEATURE_INCOMPAT_LARGE_BUCKET +#define BCH_FEATURE_INCOMPAT_SUPP (BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET| \ + BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE) #define BCH_HAS_COMPAT_FEATURE(sb, mask) \ ((sb)->feature_compat & (mask)) @@ -214,7 +215,10 @@ uint64_t crc64(const void *data, size_t len); /* Feature set definition */ /* Incompat feature set */ -#define BCH_FEATURE_INCOMPAT_LARGE_BUCKET 0x0001 /* 32bit bucket size */ +/* 32bit bucket size, obsoleted */ +#define BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET 0x0001 +/* real bucket size is (1 << bucket_size) */ +#define BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE 0x0002 #define BCH_FEATURE_COMPAT_FUNCS(name, flagname) \ static inline int bch_has_feature_##name(struct cache_sb *sb) \ @@ -267,6 +271,7 @@ static inline void bch_clear_feature_##name(struct cache_sb *sb) \ ~BCH##_FEATURE_INCOMPAT_##flagname; \ } -BCH_FEATURE_INCOMPAT_FUNCS(large_bucket, LARGE_BUCKET); +BCH_FEATURE_INCOMPAT_FUNCS(obso_large_bucket, OBSO_LARGE_BUCKET); +BCH_FEATURE_INCOMPAT_FUNCS(large_bucket, LOG_LARGE_BUCKET_SIZE); #endif diff --git a/features.c b/features.c index 181e348..f7f6224 100644 --- a/features.c +++ b/features.c @@ -20,7 +20,9 @@ struct feature { }; static struct feature feature_list[] = { - {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LARGE_BUCKET, + {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_OBSO_LARGE_BUCKET, + "obso_large_bucket"}, + {BCH_FEATURE_INCOMPAT, BCH_FEATURE_INCOMPAT_LOG_LARGE_BUCKET_SIZE, "large_bucket"}, {0, 0, 0 }, }; diff --git a/lib.c b/lib.c index a529ad3..8e7da8b 100644 --- a/lib.c +++ b/lib.c @@ -21,6 +21,19 @@ * utils function */ +static unsigned int log2_u32(uint32_t n) +{ + int r = 0; + + n = n >> 1; + while (n) { + n = n >> 1; + r++; + } + + return r; +} + static void trim_prefix(char *dest, char *src, int num) { strcpy(dest, src + num); @@ -772,7 +785,7 @@ struct cache_sb *to_cache_sb(struct cache_sb *sb, if (sb->version >= BCACHE_SB_VERSION_CDEV_WITH_FEATURES && bch_has_feature_large_bucket(sb)) - sb->bucket_size += le16_to_cpu(sb_disk->bucket_size_hi) << 16; + sb->bucket_size = 1 << le16_to_cpu(sb_disk->bucket_size); return sb; } @@ -824,7 +837,7 @@ struct cache_sb_disk *to_cache_sb_disk(struct cache_sb_disk *sb_disk, if (sb->version >= BCACHE_SB_VERSION_CDEV_WITH_FEATURES && bch_has_feature_large_bucket(sb)) - sb_disk->bucket_size_hi = cpu_to_le16(sb->bucket_size >> 16); + sb_disk->bucket_size = cpu_to_le16(log2_u32(sb->bucket_size)); return sb_disk; } diff --git a/lib.h b/lib.h index 9b5ed02..0357a11 100644 --- a/lib.h +++ b/lib.h @@ -13,7 +13,7 @@ struct dev { char label[SB_LABEL_SIZE + 1]; char uuid[40]; uint16_t sectors_per_block; - uint16_t sectors_per_bucket; + uint32_t sectors_per_bucket; char cset[40]; char state[40]; char bname[40]; -- 2.26.2
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