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Revert "btrfs: split btrfs_direct_IO to read and write part"

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This reverts commit d8f3e73587.

The patch is a cleanup of direct IO port to iomap infrastructure,
which gets reverted.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba
2020-06-09 19:19:27 +02:00
parent 2166e5edce
commit f4c48b4408
3 changed files with 90 additions and 83 deletions
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82
fs/btrfs/inode.c
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@@ -29,6 +29,7 @@
#include <linux/swap.h>
#include <linux/migrate.h>
#include <linux/sched/mm.h>
#include <linux/iomap.h>
#include <asm/unaligned.h>
#include "misc.h"
#include "ctree.h"
@@ -7819,15 +7820,92 @@ out_err:
return BLK_QC_T_NONE;
}
const struct iomap_ops btrfs_dio_iomap_ops = {
static ssize_t check_direct_IO(struct btrfs_fs_info *fs_info,
const struct iov_iter *iter, loff_t offset)
{
int seg;
int i;
unsigned int blocksize_mask = fs_info->sectorsize - 1;
ssize_t retval = -EINVAL;
if (offset & blocksize_mask)
goto out;
if (iov_iter_alignment(iter) & blocksize_mask)
goto out;
/* If this is a write we don't need to check anymore */
if (iov_iter_rw(iter) != READ || !iter_is_iovec(iter))
return 0;
/*
* Check to make sure we don't have duplicate iov_base's in this
* iovec, if so return EINVAL, otherwise we'll get csum errors
* when reading back.
*/
for (seg = 0; seg < iter->nr_segs; seg++) {
for (i = seg + 1; i < iter->nr_segs; i++) {
if (iter->iov[seg].iov_base == iter->iov[i].iov_base)
goto out;
}
}
retval = 0;
out:
return retval;
}
static const struct iomap_ops btrfs_dio_iomap_ops = {
.iomap_begin = btrfs_dio_iomap_begin,
.iomap_end = btrfs_dio_iomap_end,
};
const struct iomap_dio_ops btrfs_dops = {
static const struct iomap_dio_ops btrfs_dops = {
.submit_io = btrfs_submit_direct,
};
ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct extent_changeset *data_reserved = NULL;
loff_t offset = iocb->ki_pos;
size_t count = 0;
bool relock = false;
ssize_t ret;
if (check_direct_IO(fs_info, iter, offset))
return 0;
count = iov_iter_count(iter);
if (iov_iter_rw(iter) == WRITE) {
/*
* If the write DIO is beyond the EOF, we need update
* the isize, but it is protected by i_mutex. So we can
* not unlock the i_mutex at this case.
*/
if (offset + count <= inode->i_size) {
inode_unlock(inode);
relock = true;
} else if (iocb->ki_flags & IOCB_NOWAIT) {
ret = -EAGAIN;
goto out;
}
down_read(&BTRFS_I(inode)->dio_sem);
}
ret = iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dops,
is_sync_kiocb(iocb));
if (iov_iter_rw(iter) == WRITE) {
up_read(&BTRFS_I(inode)->dio_sem);
}
out:
if (relock)
inode_lock(inode);
extent_changeset_free(data_reserved);
return ret;
}
#define BTRFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC)
static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,