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bcache: Track dirty data by stripe

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To make background writeback aware of raid5/6 stripes, we first need to
track the amount of dirty data within each stripe - we do this by
breaking up the existing sectors_dirty into per stripe atomic_ts

Signed-off-by: Kent Overstreet <koverstreet@google.com>
This commit is contained in:
Kent Overstreet
2013-06-05 06:21:07 -07:00
parent 444fc0b6b1
commit 279afbad4e
7 changed files with 105 additions and 26 deletions
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20
drivers/md/bcache/btree.c
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@@ -24,6 +24,7 @@
#include "btree.h"
#include "debug.h"
#include "request.h"
#include "writeback.h"
#include <linux/slab.h>
#include <linux/bitops.h>
@@ -1599,14 +1600,14 @@ static bool fix_overlapping_extents(struct btree *b,
struct btree_iter *iter,
struct btree_op *op)
{
void subtract_dirty(struct bkey *k, int sectors)
void subtract_dirty(struct bkey *k, uint64_t offset, int sectors)
{
struct bcache_device *d = b->c->devices[KEY_INODE(k)];
if (KEY_DIRTY(k) && d)
atomic_long_sub(sectors, &d->sectors_dirty);
if (KEY_DIRTY(k))
bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k),
offset, -sectors);
}
uint64_t old_offset;
unsigned old_size, sectors_found = 0;
while (1) {
@@ -1618,6 +1619,7 @@ static bool fix_overlapping_extents(struct btree *b,
if (bkey_cmp(k, &START_KEY(insert)) <= 0)
continue;
old_offset = KEY_START(k);
old_size = KEY_SIZE(k);
/*
@@ -1673,7 +1675,7 @@ static bool fix_overlapping_extents(struct btree *b,
struct bkey *top;
subtract_dirty(k, KEY_SIZE(insert));
subtract_dirty(k, KEY_START(insert), KEY_SIZE(insert));
if (bkey_written(b, k)) {
/*
@@ -1720,7 +1722,7 @@ static bool fix_overlapping_extents(struct btree *b,
}
}
subtract_dirty(k, old_size - KEY_SIZE(k));
subtract_dirty(k, old_offset, old_size - KEY_SIZE(k));
}
check_failed:
@@ -1796,6 +1798,10 @@ static bool btree_insert_key(struct btree *b, struct btree_op *op,
insert: shift_keys(b, m, k);
copy: bkey_copy(m, k);
merged:
if (KEY_DIRTY(k))
bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k),
KEY_START(k), KEY_SIZE(k));
bch_check_keys(b, "%u for %s", status, op_type(op));
if (b->level && !KEY_OFFSET(k))