aboutsummaryrefslogtreecommitdiff
path: root/fs/iomap/direct-io.c
diff options
context:
space:
mode:
Diffstat (limited to 'fs/iomap/direct-io.c')
-rw-r--r--fs/iomap/direct-io.c63
1 files changed, 40 insertions, 23 deletions
diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c
index 1fc28c2da279..23837926c0c5 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);
@@ -318,7 +320,12 @@ zero_tail:
if (pad)
iomap_dio_zero(dio, iomap, pos, fs_block_size - pad);
}
- return copied ? copied : ret;
+out:
+ /* Undo iter limitation to current extent */
+ iov_iter_reexpand(dio->submit.iter, orig_count - copied);
+ if (copied)
+ return copied;
+ return ret;
}
static loff_t
@@ -358,7 +365,7 @@ iomap_dio_inline_actor(struct inode *inode, loff_t pos, loff_t length,
static loff_t
iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
- void *data, struct iomap *iomap)
+ void *data, struct iomap *iomap, struct iomap *srcmap)
{
struct iomap_dio *dio = data;
@@ -392,15 +399,15 @@ iomap_dio_actor(struct inode *inode, loff_t pos, loff_t length,
*/
ssize_t
iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
- const struct iomap_ops *ops, const struct iomap_dio_ops *dops)
+ const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
+ bool wait_for_completion)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = file_inode(iocb->ki_filp);
size_t count = iov_iter_count(iter);
- loff_t pos = iocb->ki_pos, start = pos;
+ loff_t pos = iocb->ki_pos;
loff_t end = iocb->ki_pos + count - 1, ret = 0;
unsigned int flags = IOMAP_DIRECT;
- bool wait_for_completion = is_sync_kiocb(iocb);
struct blk_plug plug;
struct iomap_dio *dio;
@@ -409,6 +416,9 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
if (!count)
return 0;
+ if (WARN_ON(is_sync_kiocb(iocb) && !wait_for_completion))
+ return -EIO;
+
dio = kmalloc(sizeof(*dio), GFP_KERNEL);
if (!dio)
return -ENOMEM;
@@ -430,7 +440,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
if (pos >= dio->i_size)
goto out_free_dio;
- if (iter_is_iovec(iter) && iov_iter_rw(iter) == READ)
+ if (iter_is_iovec(iter))
dio->flags |= IOMAP_DIO_DIRTY;
} else {
flags |= IOMAP_WRITE;
@@ -451,14 +461,14 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
}
if (iocb->ki_flags & IOCB_NOWAIT) {
- if (filemap_range_has_page(mapping, start, end)) {
+ if (filemap_range_has_page(mapping, pos, end)) {
ret = -EAGAIN;
goto out_free_dio;
}
flags |= IOMAP_NOWAIT;
}
- ret = filemap_write_and_wait_range(mapping, start, end);
+ ret = filemap_write_and_wait_range(mapping, pos, end);
if (ret)
goto out_free_dio;
@@ -469,7 +479,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
* pretty crazy thing to do, so we don't support it 100%.
*/
ret = invalidate_inode_pages2_range(mapping,
- start >> PAGE_SHIFT, end >> PAGE_SHIFT);
+ pos >> PAGE_SHIFT, end >> PAGE_SHIFT);
if (ret)
dio_warn_stale_pagecache(iocb->ki_filp);
ret = 0;
@@ -497,8 +507,15 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
}
pos += ret;
- if (iov_iter_rw(iter) == READ && pos >= dio->i_size)
+ if (iov_iter_rw(iter) == READ && pos >= dio->i_size) {
+ /*
+ * We only report that we've read data up to i_size.
+ * Revert iter to a state corresponding to that as
+ * some callers (such as splice code) rely on it.
+ */
+ iov_iter_revert(iter, pos - dio->i_size);
break;
+ }
} while ((count = iov_iter_count(iter)) > 0);
blk_finish_plug(&plug);
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-11 23:30:24 +0000