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Btrfs: separate DISCARD from __btrfs_map_block 

Since DISCARD is not as important as an operation like write, we don't
copy it to target device during replace, and it makes __btrfs_map_block
less complex.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo 2017-03-14 13:33:56 -07:00 committed by David Sterba
parent 592d92eeab
commit 0b3d4cd371
1 changed files with 175 additions and 114 deletions
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289
fs/btrfs/volumes.c
View File

@ -5298,6 +5298,158 @@ void btrfs_put_bbio(struct btrfs_bio *bbio)
kfree(bbio);
}
/* can REQ_OP_DISCARD be sent with other REQ like REQ_OP_WRITE? */
/*
* Please note that, discard won't be sent to target device of device
* replace.
*/
static int __btrfs_map_block_for_discard(struct btrfs_fs_info *fs_info,
u64 logical, u64 length,
struct btrfs_bio **bbio_ret)
{
struct extent_map *em;
struct map_lookup *map;
struct btrfs_bio *bbio;
u64 offset;
u64 stripe_nr;
u64 stripe_nr_end;
u64 stripe_end_offset;
u64 stripe_cnt;
u64 stripe_len;
u64 stripe_offset;
u64 num_stripes;
u32 stripe_index;
u32 factor = 0;
u32 sub_stripes = 0;
u64 stripes_per_dev = 0;
u32 remaining_stripes = 0;
u32 last_stripe = 0;
int ret = 0;
int i;
/* discard always return a bbio */
ASSERT(bbio_ret);
em = get_chunk_map(fs_info, logical, length);
if (IS_ERR(em))
return PTR_ERR(em);
map = em->map_lookup;
/* we don't discard raid56 yet */
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
ret = -EOPNOTSUPP;
goto out;
}
offset = logical - em->start;
length = min_t(u64, em->len - offset, length);
stripe_len = map->stripe_len;
/*
* stripe_nr counts the total number of stripes we have to stride
* to get to this block
*/
stripe_nr = div64_u64(offset, stripe_len);
/* stripe_offset is the offset of this block in its stripe */
stripe_offset = offset - stripe_nr * stripe_len;
stripe_nr_end = round_up(offset + length, map->stripe_len);
stripe_nr_end = div_u64(stripe_nr_end, map->stripe_len);
stripe_cnt = stripe_nr_end - stripe_nr;
stripe_end_offset = stripe_nr_end * map->stripe_len -
(offset + length);
/*
* after this, stripe_nr is the number of stripes on this
* device we have to walk to find the data, and stripe_index is
* the number of our device in the stripe array
*/
num_stripes = 1;
stripe_index = 0;
if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID10)) {
if (map->type & BTRFS_BLOCK_GROUP_RAID0)
sub_stripes = 1;
else
sub_stripes = map->sub_stripes;
factor = map->num_stripes / sub_stripes;
num_stripes = min_t(u64, map->num_stripes,
sub_stripes * stripe_cnt);
stripe_nr = div_u64_rem(stripe_nr, factor, &stripe_index);
stripe_index *= sub_stripes;
stripes_per_dev = div_u64_rem(stripe_cnt, factor,
&remaining_stripes);
div_u64_rem(stripe_nr_end - 1, factor, &last_stripe);
last_stripe *= sub_stripes;
} else if (map->type & (BTRFS_BLOCK_GROUP_RAID1 |
BTRFS_BLOCK_GROUP_DUP)) {
num_stripes = map->num_stripes;
} else {
stripe_nr = div_u64_rem(stripe_nr, map->num_stripes,
&stripe_index);
}
bbio = alloc_btrfs_bio(num_stripes, 0);
if (!bbio) {
ret = -ENOMEM;
goto out;
}
for (i = 0; i < num_stripes; i++) {
bbio->stripes[i].physical =
map->stripes[stripe_index].physical +
stripe_offset + stripe_nr * map->stripe_len;
bbio->stripes[i].dev = map->stripes[stripe_index].dev;
if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID10)) {
bbio->stripes[i].length = stripes_per_dev *
map->stripe_len;
if (i / sub_stripes < remaining_stripes)
bbio->stripes[i].length +=
map->stripe_len;
/*
* Special for the first stripe and
* the last stripe:
*
* |-------|...|-------|
* |----------|
* off end_off
*/
if (i < sub_stripes)
bbio->stripes[i].length -=
stripe_offset;
if (stripe_index >= last_stripe &&
stripe_index <= (last_stripe +
sub_stripes - 1))
bbio->stripes[i].length -=
stripe_end_offset;
if (i == sub_stripes - 1)
stripe_offset = 0;
} else {
bbio->stripes[i].length = length;
}
stripe_index++;
if (stripe_index == map->num_stripes) {
stripe_index = 0;
stripe_nr++;
}
}
*bbio_ret = bbio;
bbio->map_type = map->type;
bbio->num_stripes = num_stripes;
out:
free_extent_map(em);
return ret;
}
static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
enum btrfs_map_op op,
u64 logical, u64 *length,
@ -5308,10 +5460,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
struct map_lookup *map;
u64 offset;
u64 stripe_offset;
u64 stripe_end_offset;
u64 stripe_nr;
u64 stripe_nr_orig;
u64 stripe_nr_end;
u64 stripe_len;
u32 stripe_index;
int i;
@ -5327,6 +5476,10 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
u64 physical_to_patch_in_first_stripe = 0;
u64 raid56_full_stripe_start = (u64)-1;
if (op == BTRFS_MAP_DISCARD)
return __btrfs_map_block_for_discard(fs_info, logical,
*length, bbio_ret);
em = get_chunk_map(fs_info, logical, *length);
if (IS_ERR(em))
return PTR_ERR(em);
@ -5368,14 +5521,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
raid56_full_stripe_start *= full_stripe_len;
}
if (op == BTRFS_MAP_DISCARD) {
/* we don't discard raid56 yet */
if (map->type & BTRFS_BLOCK_GROUP_RAID56_MASK) {
ret = -EOPNOTSUPP;
goto out;
}
*length = min_t(u64, em->len - offset, *length);
} else if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
if (map->type & BTRFS_BLOCK_GROUP_PROFILE_MASK) {
u64 max_len;
/* For writes to RAID[56], allow a full stripeset across all disks.
For other RAID types and for RAID[56] reads, just allow a single
@ -5406,8 +5552,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
btrfs_dev_replace_set_lock_blocking(dev_replace);
if (dev_replace_is_ongoing && mirror_num == map->num_stripes + 1 &&
op != BTRFS_MAP_WRITE && op != BTRFS_MAP_DISCARD &&
op != BTRFS_MAP_GET_READ_MIRRORS && dev_replace->tgtdev != NULL) {
op != BTRFS_MAP_WRITE && op != BTRFS_MAP_GET_READ_MIRRORS &&
dev_replace->tgtdev != NULL) {
/*
* in dev-replace case, for repair case (that's the only
* case where the mirror is selected explicitly when
@ -5487,24 +5633,13 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
num_stripes = 1;
stripe_index = 0;
stripe_nr_orig = stripe_nr;
stripe_nr_end = ALIGN(offset + *length, map->stripe_len);
stripe_nr_end = div_u64(stripe_nr_end, map->stripe_len);
stripe_end_offset = stripe_nr_end * map->stripe_len -
(offset + *length);
if (map->type & BTRFS_BLOCK_GROUP_RAID0) {
if (op == BTRFS_MAP_DISCARD)
num_stripes = min_t(u64, map->num_stripes,
stripe_nr_end - stripe_nr_orig);
stripe_nr = div_u64_rem(stripe_nr, map->num_stripes,
&stripe_index);
if (op != BTRFS_MAP_WRITE && op != BTRFS_MAP_DISCARD &&
op != BTRFS_MAP_GET_READ_MIRRORS)
if (op != BTRFS_MAP_WRITE && op != BTRFS_MAP_GET_READ_MIRRORS)
mirror_num = 1;
} else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_DISCARD ||
op == BTRFS_MAP_GET_READ_MIRRORS)
if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS)
num_stripes = map->num_stripes;
else if (mirror_num)
stripe_index = mirror_num - 1;
@ -5517,8 +5652,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
}
} else if (map->type & BTRFS_BLOCK_GROUP_DUP) {
if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_DISCARD ||
op == BTRFS_MAP_GET_READ_MIRRORS) {
if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS) {
num_stripes = map->num_stripes;
} else if (mirror_num) {
stripe_index = mirror_num - 1;
@ -5534,10 +5668,6 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS)
num_stripes = map->sub_stripes;
else if (op == BTRFS_MAP_DISCARD)
num_stripes = min_t(u64, map->sub_stripes *
(stripe_nr_end - stripe_nr_orig),
map->num_stripes);
else if (mirror_num)
stripe_index += mirror_num - 1;
else {
@ -5580,8 +5710,9 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
/* We distribute the parity blocks across stripes */
div_u64_rem(stripe_nr + stripe_index, map->num_stripes,
&stripe_index);
if ((op != BTRFS_MAP_WRITE && op != BTRFS_MAP_DISCARD &&
op != BTRFS_MAP_GET_READ_MIRRORS) && mirror_num <= 1)
if ((op != BTRFS_MAP_WRITE &&
op != BTRFS_MAP_GET_READ_MIRRORS) &&
mirror_num <= 1)
mirror_num = 1;
}
} else {
@ -5604,7 +5735,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
num_alloc_stripes = num_stripes;
if (dev_replace_is_ongoing) {
if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_DISCARD)
if (op == BTRFS_MAP_WRITE)
num_alloc_stripes <<= 1;
if (op == BTRFS_MAP_GET_READ_MIRRORS)
num_alloc_stripes++;
@ -5647,84 +5778,15 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
RAID6_Q_STRIPE;
}
if (op == BTRFS_MAP_DISCARD) {
u32 factor = 0;
u32 sub_stripes = 0;
u64 stripes_per_dev = 0;
u32 remaining_stripes = 0;
u32 last_stripe = 0;
if (map->type &
(BTRFS_BLOCK_GROUP_RAID0 | BTRFS_BLOCK_GROUP_RAID10)) {
if (map->type & BTRFS_BLOCK_GROUP_RAID0)
sub_stripes = 1;
else
sub_stripes = map->sub_stripes;
factor = map->num_stripes / sub_stripes;
stripes_per_dev = div_u64_rem(stripe_nr_end -
stripe_nr_orig,
factor,
&remaining_stripes);
div_u64_rem(stripe_nr_end - 1, factor, &last_stripe);
last_stripe *= sub_stripes;
}
for (i = 0; i < num_stripes; i++) {
bbio->stripes[i].physical =
map->stripes[stripe_index].physical +
stripe_offset + stripe_nr * map->stripe_len;
bbio->stripes[i].dev = map->stripes[stripe_index].dev;
if (map->type & (BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID10)) {
bbio->stripes[i].length = stripes_per_dev *
map->stripe_len;
if (i / sub_stripes < remaining_stripes)
bbio->stripes[i].length +=
map->stripe_len;
/*
* Special for the first stripe and
* the last stripe:
*
* |-------|...|-------|
* |----------|
* off end_off
*/
if (i < sub_stripes)
bbio->stripes[i].length -=
stripe_offset;
if (stripe_index >= last_stripe &&
stripe_index <= (last_stripe +
sub_stripes - 1))
bbio->stripes[i].length -=
stripe_end_offset;
if (i == sub_stripes - 1)
stripe_offset = 0;
} else
bbio->stripes[i].length = *length;
stripe_index++;
if (stripe_index == map->num_stripes) {
/* This could only happen for RAID0/10 */
stripe_index = 0;
stripe_nr++;
}
}
} else {
for (i = 0; i < num_stripes; i++) {
bbio->stripes[i].physical =
map->stripes[stripe_index].physical +
stripe_offset +
stripe_nr * map->stripe_len;
bbio->stripes[i].dev =
map->stripes[stripe_index].dev;
stripe_index++;
}
for (i = 0; i < num_stripes; i++) {
bbio->stripes[i].physical =
map->stripes[stripe_index].physical +
stripe_offset +
stripe_nr * map->stripe_len;
bbio->stripes[i].dev =
map->stripes[stripe_index].dev;
stripe_index++;
}
if (op == BTRFS_MAP_WRITE || op == BTRFS_MAP_GET_READ_MIRRORS)
@ -5734,8 +5796,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info,
sort_parity_stripes(bbio, num_stripes);
tgtdev_indexes = 0;
if (dev_replace_is_ongoing &&
(op == BTRFS_MAP_WRITE || op == BTRFS_MAP_DISCARD) &&
if (dev_replace_is_ongoing && op == BTRFS_MAP_WRITE &&
dev_replace->tgtdev != NULL) {
int index_where_to_add;
u64 srcdev_devid = dev_replace->srcdev->devid;