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platform_kernel-5.15
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New code for 5.5: 

- Make iomap_dio_rw callers explicitly tell us if they want us to wait
 - Port the xfs writeback code to iomap to complete the buffered io
   library functions
 - Refactor the unshare code to share common pieces
 - Add support for performing copy on write with buffered writes
 - Other minor fixes
 - Fix unchecked return in iomap_bmap
 - Fix a type casting bug in a ternary statement in iomap_dio_bio_actor
 - Improve tracepoints for easier diagnostic ability
 - Fix pipe page leakage in directio reads
 - Clean up iter usage in directio paths
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Merge tag 'iomap-5.5-merge-13' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull iomap cleanups from Darrick Wong:
 "Aome more new iomap code for 5.5.

  There's not much this time -- just removing some local variables that
  don't need to exist in the iomap directio code"

* tag 'iomap-5.5-merge-13' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  iomap: remove unneeded variable in iomap_dio_rw()
  iomap: Do not create fake iter in iomap_dio_bio_actor()
This commit is contained in:
Linus Torvalds 2019-12-03 13:18:34 -08:00
parent 79e178a57d 88cfd30e18
commit 2a31aca500
1 changed files with 22 additions and 17 deletions
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39
fs/iomap/direct-io.c
View File

@ -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 @@ iomap_dio_bio_actor(struct inode *inode, loff_t pos, loff_t length,
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;
@ -400,7 +405,7 @@ iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
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;
struct blk_plug plug;
@ -456,14 +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;
@ -474,7 +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;