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iomap: use kiocb_write_and_wait and kiocb_invalidate_pages

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Use the common helpers for direct I/O page invalidation instead of open
coding the logic.  This leads to a slight reordering of checks in
__iomap_dio_rw to keep the logic straight.

Link: https://lkml.kernel.org/r/20230601145904.1385409-9-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Andreas Gruenbacher <agruenba@redhat.com>
Cc: Anna Schumaker <anna@kernel.org>
Cc: Chao Yu <chao@kernel.org>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Ilya Dryomov <idryomov@gmail.com>
Cc: Jaegeuk Kim <jaegeuk@kernel.org>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Miklos Szeredi <miklos@szeredi.hu>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Theodore Ts'o <tytso@mit.edu>
Cc: Trond Myklebust <trond.myklebust@hammerspace.com>
Cc: Xiubo Li <xiubli@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2023-06-01 16:59:00 +02:00 committed by Andrew Morton
parent 219580eea1
commit 8ee93b4bb6
1 changed files with 20 additions and 35 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

55
fs/iomap/direct-io.c
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@ -472,7 +472,6 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
const struct iomap_ops *ops, const struct iomap_dio_ops *dops,
unsigned int dio_flags, void *private, size_t done_before)
{
struct address_space *mapping = iocb->ki_filp->f_mapping;
struct inode *inode = file_inode(iocb->ki_filp);
struct iomap_iter iomi = {
.inode = inode,
@ -481,11 +480,11 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
.flags = IOMAP_DIRECT,
.private = private,
};
loff_t end = iomi.pos + iomi.len - 1, ret = 0;
bool wait_for_completion =
is_sync_kiocb(iocb) || (dio_flags & IOMAP_DIO_FORCE_WAIT);
struct blk_plug plug;
struct iomap_dio *dio;
loff_t ret = 0;
trace_iomap_dio_rw_begin(iocb, iter, dio_flags, done_before);
@ -509,31 +508,29 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
dio->submit.waiter = current;
dio->submit.poll_bio = NULL;
if (iocb->ki_flags & IOCB_NOWAIT)
iomi.flags |= IOMAP_NOWAIT;
if (iov_iter_rw(iter) == READ) {
if (iomi.pos >= dio->i_size)
goto out_free_dio;
if (iocb->ki_flags & IOCB_NOWAIT) {
if (filemap_range_needs_writeback(mapping, iomi.pos,
end)) {
ret = -EAGAIN;
goto out_free_dio;
}
iomi.flags |= IOMAP_NOWAIT;
}
if (user_backed_iter(iter))
dio->flags |= IOMAP_DIO_DIRTY;
ret = kiocb_write_and_wait(iocb, iomi.len);
if (ret)
goto out_free_dio;
} else {
iomi.flags |= IOMAP_WRITE;
dio->flags |= IOMAP_DIO_WRITE;
if (iocb->ki_flags & IOCB_NOWAIT) {
if (filemap_range_has_page(mapping, iomi.pos, end)) {
ret = -EAGAIN;
if (dio_flags & IOMAP_DIO_OVERWRITE_ONLY) {
ret = -EAGAIN;
if (iomi.pos >= dio->i_size ||
iomi.pos + iomi.len > dio->i_size)
goto out_free_dio;
}
iomi.flags |= IOMAP_NOWAIT;
iomi.flags |= IOMAP_OVERWRITE_ONLY;
}
/* for data sync or sync, we need sync completion processing */
@ -549,31 +546,19 @@ __iomap_dio_rw(struct kiocb *iocb, struct iov_iter *iter,
if (!(iocb->ki_flags & IOCB_SYNC))
dio->flags |= IOMAP_DIO_WRITE_FUA;
}
}
if (dio_flags & IOMAP_DIO_OVERWRITE_ONLY) {
ret = -EAGAIN;
if (iomi.pos >= dio->i_size ||
iomi.pos + iomi.len > dio->i_size)
goto out_free_dio;
iomi.flags |= IOMAP_OVERWRITE_ONLY;
}
ret = filemap_write_and_wait_range(mapping, iomi.pos, end);
if (ret)
goto out_free_dio;
if (iov_iter_rw(iter) == WRITE) {
/*
* Try to invalidate cache pages for the range we are writing.
* If this invalidation fails, let the caller fall back to
* buffered I/O.
*/
if (invalidate_inode_pages2_range(mapping,
iomi.pos >> PAGE_SHIFT, end >> PAGE_SHIFT)) {
trace_iomap_dio_invalidate_fail(inode, iomi.pos,
iomi.len);
ret = -ENOTBLK;
ret = kiocb_invalidate_pages(iocb, iomi.len);
if (ret) {
if (ret != -EAGAIN) {
trace_iomap_dio_invalidate_fail(inode, iomi.pos,
iomi.len);
ret = -ENOTBLK;
}
goto out_free_dio;
}