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btrfs: replace remaining do_div calls with div_u64 variants

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Switch to div_u64_rem that does type checking and has more obvious
semantics than do_div.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba
2015-02-20 18:43:47 +01:00
parent b8b93addde
commit 47c5713f47
4 changed files with 20 additions and 19 deletions
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2
fs/btrfs/extent-tree.c
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@@ -8670,7 +8670,7 @@ int btrfs_can_relocate(struct btrfs_root *root, u64 bytenr)
min_free <<= 1;
} else if (index == BTRFS_RAID_RAID0) {
dev_min = fs_devices->rw_devices;
do_div(min_free, dev_min);
min_free = div64_u64(min_free, dev_min);
}
/* We need to do this so that we can look at pending chunks */

2
fs/btrfs/free-space-cache.c
View File

@@ -1673,7 +1673,7 @@ find_free_space(struct btrfs_free_space_ctl *ctl, u64 *offset, u64 *bytes,
*/
if (*bytes >= align) {
tmp = entry->offset - ctl->start + align - 1;
do_div(tmp, align);
tmp = div64_u64(tmp, align);
tmp = tmp * align + ctl->start;
align_off = tmp - entry->offset;
} else {

4
fs/btrfs/scrub.c
View File

@@ -2328,7 +2328,7 @@ static inline void __scrub_mark_bitmap(struct scrub_parity *sparity,
}
start -= sparity->logic_start;
offset = (int)do_div(start, sparity->stripe_len);
start = div_u64_rem(start, sparity->stripe_len, &offset);
offset /= sectorsize;
nsectors = (int)len / sectorsize;
@@ -2627,7 +2627,7 @@ static int get_raid56_logic_offset(u64 physical, int num,
stripe_nr = div_u64(stripe_nr, nr_data_stripes(map));
/* Work out the disk rotation on this stripe-set */
rot = do_div(stripe_nr, map->num_stripes);
stripe_nr = div_u64_rem(stripe_nr, map->num_stripes, &rot);
/* calculate which stripe this data locates */
rot += i;
stripe_index = rot % map->num_stripes;

31
fs/btrfs/volumes.c
View File

@@ -4994,7 +4994,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
* stripe_nr counts the total number of stripes we have to stride
* to get to this block
*/
do_div(stripe_nr, stripe_len);
stripe_nr = div64_u64(stripe_nr, stripe_len);
stripe_offset = stripe_nr * stripe_len;
BUG_ON(offset < stripe_offset);
@@ -5010,7 +5010,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
/* allow a write of a full stripe, but make sure we don't
* allow straddling of stripes
*/
do_div(raid56_full_stripe_start, full_stripe_len);
raid56_full_stripe_start = div64_u64(raid56_full_stripe_start,
full_stripe_len);
raid56_full_stripe_start *= full_stripe_len;
}
@@ -5143,7 +5144,8 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
if (rw & REQ_DISCARD)
num_stripes = min_t(u64, map->num_stripes,
stripe_nr_end - stripe_nr_orig);
stripe_index = do_div(stripe_nr, map->num_stripes);
stripe_nr = div_u64_rem(stripe_nr, map->num_stripes,
&stripe_index);
if (!(rw & (REQ_WRITE | REQ_DISCARD | REQ_GET_READ_MIRRORS)))
mirror_num = 1;
} else if (map->type & BTRFS_BLOCK_GROUP_RAID1) {
@@ -5171,7 +5173,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
} else if (map->type & BTRFS_BLOCK_GROUP_RAID10) {
int factor = map->num_stripes / map->sub_stripes;
stripe_index = do_div(stripe_nr, factor);
stripe_nr = div_u64_rem(stripe_nr, factor, &stripe_index);
stripe_index *= map->sub_stripes;
if (rw & (REQ_WRITE | REQ_GET_READ_MIRRORS))
@@ -5208,32 +5210,32 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
stripe_index = 0;
stripe_offset = 0;
} else {
u64 tmp;
/*
* Mirror #0 or #1 means the original data block.
* Mirror #2 is RAID5 parity block.
* Mirror #3 is RAID6 Q block.
*/
stripe_index = do_div(stripe_nr, nr_data_stripes(map));
stripe_nr = div_u64_rem(stripe_nr,
nr_data_stripes(map), &stripe_index);
if (mirror_num > 1)
stripe_index = nr_data_stripes(map) +
mirror_num - 2;
/* We distribute the parity blocks across stripes */
tmp = stripe_nr + stripe_index;
stripe_index = do_div(tmp, map->num_stripes);
div_u64_rem(stripe_nr + stripe_index, map->num_stripes,
&stripe_index);
if (!(rw & (REQ_WRITE | REQ_DISCARD |
REQ_GET_READ_MIRRORS)) && mirror_num <= 1)
mirror_num = 1;
}
} else {
/*
* after this do_div call, 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
* 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
*/
stripe_index = do_div(stripe_nr, map->num_stripes);
stripe_nr = div_u64_rem(stripe_nr, map->num_stripes,
&stripe_index);
mirror_num = stripe_index + 1;
}
BUG_ON(stripe_index >= map->num_stripes);
@@ -5268,8 +5270,7 @@ static int __btrfs_map_block(struct btrfs_fs_info *fs_info, int rw,
sizeof(int) * tgtdev_indexes);
/* Work out the disk rotation on this stripe-set */
tmp = stripe_nr;
rot = do_div(tmp, num_stripes);
div_u64_rem(stripe_nr, num_stripes, &rot);
/* Fill in the logical address of each stripe */
tmp = stripe_nr * nr_data_stripes(map);