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bcachefs: dio arithmetic improvements

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Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2019-01-19 18:12:24 -05:00 committed by Kent Overstreet
parent b030f691da
commit 919dbbd18b
1 changed files with 13 additions and 10 deletions
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23
fs/bcachefs/fs-io.c
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@ -1782,6 +1782,7 @@ static long bch2_dio_write_loop(struct dio_write *dio)
struct bio *bio = &dio->iop.op.wbio.bio;
struct bvec_iter_all iter;
struct bio_vec *bv;
loff_t offset;
bool sync;
long ret;
@ -1792,12 +1793,16 @@ static long bch2_dio_write_loop(struct dio_write *dio)
bch2_pagecache_block_get(&inode->ei_pagecache_lock);
/* Write and invalidate pagecache range that we're writing to: */
ret = write_invalidate_inode_pages_range(mapping, req->ki_pos,
req->ki_pos + iov_iter_count(&dio->iter) - 1);
offset = req->ki_pos + (dio->iop.op.written << 9);
ret = write_invalidate_inode_pages_range(mapping,
offset,
offset + iov_iter_count(&dio->iter) - 1);
if (unlikely(ret))
goto err;
while (1) {
offset = req->ki_pos + (dio->iop.op.written << 9);
if (kthread)
kthread_use_mm(dio->mm);
BUG_ON(current->faults_disabled_mapping);
@ -1814,13 +1819,12 @@ static long bch2_dio_write_loop(struct dio_write *dio)
/* gup might have faulted pages back in: */
ret = write_invalidate_inode_pages_range(mapping,
req->ki_pos + (dio->iop.op.written << 9),
req->ki_pos + iov_iter_count(&dio->iter) - 1);
offset,
offset + bio->bi_iter.bi_size - 1);
if (unlikely(ret))
goto err;
dio->iop.op.pos = POS(inode->v.i_ino,
(req->ki_pos >> 9) + dio->iop.op.written);
dio->iop.op.pos = POS(inode->v.i_ino, offset >> 9);
task_io_account_write(bio->bi_iter.bi_size);
@ -1888,7 +1892,6 @@ ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
struct bch_fs *c = inode->v.i_sb->s_fs_info;
struct dio_write *dio;
struct bio *bio;
loff_t offset = req->ki_pos;
ssize_t ret;
lockdep_assert_held(&inode->v.i_rwsem);
@ -1896,7 +1899,7 @@ ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
if (unlikely(!iter->count))
return 0;
if (unlikely((offset|iter->count) & (block_bytes(c) - 1)))
if (unlikely((req->ki_pos|iter->count) & (block_bytes(c) - 1)))
return -EINVAL;
bio = bio_alloc_bioset(NULL,
@ -1910,7 +1913,7 @@ ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
dio->mm = current->mm;
dio->loop = false;
dio->sync = is_sync_kiocb(req) ||
offset + iter->count > inode->v.i_size;
req->ki_pos + iter->count > inode->v.i_size;
dio->free_iov = false;
dio->quota_res.sectors = 0;
dio->iter = *iter;
@ -1931,7 +1934,7 @@ ssize_t bch2_direct_write(struct kiocb *req, struct iov_iter *iter)
dio->iop.op.opts.data_replicas, 0);
if (unlikely(ret)) {
if (bch2_check_range_allocated(c, POS(inode->v.i_ino,
offset >> 9),
req->ki_pos >> 9),
iter->count >> 9))
goto err;