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bcachefs: Add an option to control sharding new inode numbers

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We're seeing a bug where inode creates end up spinning in
bch2_inode_create - disabling sharding will simplify what we're testing.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2021-05-27 20:20:20 -04:00 committed by Kent Overstreet
parent 9f311f2166
commit b282a74fae
3 changed files with 21 additions and 8 deletions
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1
fs/bcachefs/bcachefs_format.h
View File

@ -1348,6 +1348,7 @@ LE64_BITMASK(BCH_SB_GC_RESERVE_BYTES, struct bch_sb, flags[2], 4, 64);
LE64_BITMASK(BCH_SB_ERASURE_CODE, struct bch_sb, flags[3], 0, 16);
LE64_BITMASK(BCH_SB_METADATA_TARGET, struct bch_sb, flags[3], 16, 28);
LE64_BITMASK(BCH_SB_SHARD_INUMS, struct bch_sb, flags[3], 28, 29);
/*
* Features:

21
fs/bcachefs/inode.c
View File

@ -479,16 +479,23 @@ struct btree_iter *bch2_inode_create(struct btree_trans *trans,
struct bkey_s_c k;
u64 min, max, start, pos, *hint;
int ret = 0;
unsigned bits = (c->opts.inodes_32bit ? 31 : 63);
u64 cpu = raw_smp_processor_id();
unsigned bits = (c->opts.inodes_32bit
? 31 : 63) - c->inode_shard_bits;
if (c->opts.shard_inode_numbers) {
u64 cpu = raw_smp_processor_id();
min = (cpu << bits);
max = (cpu << bits) | ~(ULLONG_MAX << bits);
bits -= c->inode_shard_bits;
min = max_t(u64, min, BLOCKDEV_INODE_MAX);
hint = c->unused_inode_hints + cpu;
min = (cpu << bits);
max = (cpu << bits) | ~(ULLONG_MAX << bits);
min = max_t(u64, min, BLOCKDEV_INODE_MAX);
hint = c->unused_inode_hints + cpu;
} else {
min = BLOCKDEV_INODE_MAX;
max = ~(ULLONG_MAX << bits);
hint = c->unused_inode_hints;
}
start = READ_ONCE(*hint);

7
fs/bcachefs/opts.h
View File

@ -165,8 +165,13 @@ enum opt_type {
x(inodes_32bit, u8, \
OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME, \
OPT_BOOL(), \
BCH_SB_INODE_32BIT, false, \
BCH_SB_INODE_32BIT, true, \
NULL, "Constrain inode numbers to 32 bits") \
x(shard_inode_numbers, u8, \
OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME, \
OPT_BOOL(), \
BCH_SB_SHARD_INUMS, false, \
NULL, "Shard new inode numbers by CPU id") \
x(gc_reserve_percent, u8, \
OPT_FORMAT|OPT_MOUNT|OPT_RUNTIME, \
OPT_UINT(5, 21), \