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-rw-r--r--fs/iomap/direct-io.c31
1 files changed, 18 insertions, 13 deletions
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 420c0c82f0ac..b75cd0b0609b 100644
--- a/fs/iomap/direct-io.c
+++ b/fs/iomap/direct-io.c
@@ -201,12 +201,12 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
unsigned int blkbits = blksize_bits(bdev_logical_block_size(iomap->bdev));
unsigned int fs_block_size = i_blocksize(inode), pad;
unsigned int align = iov_iter_alignment(dio->submit.iter);
- struct iov_iter iter;
struct bio *bio;
bool need_zeroout = false;
bool use_fua = false;
int nr_pages, ret = 0;
size_t copied = 0;
+ size_t orig_count;
if ((pos | length | align) & ((1 << blkbits) - 1))
return -EINVAL;
@@ -236,15 +236,18 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
}
/*
- * Operate on a partial iter trimmed to the extent we were called for.
- * We'll update the iter in the dio once we're done with this extent.
+ * Save the original count and trim the iter to just the extent we
+ * are operating on right now. The iter will be re-expanded once
+ * we are done.
*/
- iter = *dio->submit.iter;
- iov_iter_truncate(&iter, length);
+ orig_count = iov_iter_count(dio->submit.iter);
+ iov_iter_truncate(dio->submit.iter, length);
- nr_pages = iov_iter_npages(&iter, BIO_MAX_PAGES);
- if (nr_pages <= 0)
- return nr_pages;
+ nr_pages = iov_iter_npages(dio->submit.iter, BIO_MAX_PAGES);
+ if (nr_pages <= 0) {
+ ret = nr_pages;
+ goto out;
+ }
if (need_zeroout) {
/* zero out from the start of the block to the write offset */
@@ -257,7 +260,8 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
size_t n;
if (dio->error) {
iov_iter_revert(dio->submit.iter, copied);
- return 0;
+ copied = ret = 0;
+ goto out;
}
bio = bio_alloc(GFP_KERNEL, nr_pages);
@@ -268,7 +272,7 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
bio->bi_private = dio;
bio->bi_end_io = iomap_dio_bio_end_io;
- ret = bio_iov_iter_get_pages(bio, &iter);
+ ret = bio_iov_iter_get_pages(bio, dio->submit.iter);
if (unlikely(ret)) {
/*
* We have to stop part way through an IO. We must fall
@@ -294,13 +298,11 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
bio_set_pages_dirty(bio);
}
- iov_iter_advance(dio->submit.iter, n);
-
dio->size += n;
pos += n;
copied += n;
- nr_pages = iov_iter_npages(&iter, BIO_MAX_PAGES);
+ nr_pages = iov_iter_npages(dio->submit.iter, BIO_MAX_PAGES);
iomap_dio_submit_bio(dio, iomap, bio);
} while (nr_pages);
@@ -318,6 +320,9 @@ zero_tail:
if (pad)
iomap_dio_zero(dio, iomap, pos, fs_block_size - pad);
}
+out:
+ /* Undo iter limitation to current extent */
+ iov_iter_reexpand(dio->submit.iter, orig_count - copied);
if (copied)
return copied;
return ret;