#include <linux/kernel.h>
#include <linux/bio.h>
+#include <linux/buffer_head.h>
#include <linux/file.h>
#include <linux/fs.h>
#include <linux/pagemap.h>
struct btrfs_dio_data {
u64 reserve;
- loff_t length;
- ssize_t submitted;
- struct extent_changeset *data_reserved;
+ u64 unsubmitted_oe_range_start;
+ u64 unsubmitted_oe_range_end;
+ int overwrite;
};
static const struct inode_operations btrfs_dir_inode_operations;
truncate_setsize(inode, newsize);
+ /* Disable nonlocked read DIO to avoid the endless truncate */
+ btrfs_inode_block_unlocked_dio(BTRFS_I(inode));
inode_dio_wait(inode);
+ btrfs_inode_resume_unlocked_dio(BTRFS_I(inode));
ret = btrfs_truncate(inode, newsize == oldsize);
if (ret && inode->i_nlink) {
}
static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend,
- struct extent_state **cached_state, bool writing)
+ struct extent_state **cached_state, int writing)
{
struct btrfs_ordered_extent *ordered;
int ret = 0;
}
+static int btrfs_get_blocks_direct_read(struct extent_map *em,
+ struct buffer_head *bh_result,
+ struct inode *inode,
+ u64 start, u64 len)
+{
+ struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
+
+ if (em->block_start == EXTENT_MAP_HOLE ||
+ test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
+ return -ENOENT;
+
+ len = min(len, em->len - (start - em->start));
+
+ bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
+ inode->i_blkbits;
+ bh_result->b_size = len;
+ bh_result->b_bdev = fs_info->fs_devices->latest_bdev;
+ set_buffer_mapped(bh_result);
+
+ return 0;
+}
+
static int btrfs_get_blocks_direct_write(struct extent_map **map,
+ struct buffer_head *bh_result,
struct inode *inode,
struct btrfs_dio_data *dio_data,
u64 start, u64 len)
}
/* this will cow the extent */
+ len = bh_result->b_size;
free_extent_map(em);
*map = em = btrfs_new_extent_direct(inode, start, len);
if (IS_ERR(em)) {
len = min(len, em->len - (start - em->start));
skip_cow:
+ bh_result->b_blocknr = (em->block_start + (start - em->start)) >>
+ inode->i_blkbits;
+ bh_result->b_size = len;
+ bh_result->b_bdev = fs_info->fs_devices->latest_bdev;
+ set_buffer_mapped(bh_result);
+
+ if (!test_bit(EXTENT_FLAG_PREALLOC, &em->flags))
+ set_buffer_new(bh_result);
+
/*
* Need to update the i_size under the extent lock so buffered
* readers will get the updated i_size when we unlock.
*/
- if (start + len > i_size_read(inode))
+ if (!dio_data->overwrite && start + len > i_size_read(inode))
i_size_write(inode, start + len);
+ WARN_ON(dio_data->reserve < len);
dio_data->reserve -= len;
+ dio_data->unsubmitted_oe_range_end = start + len;
+ current->journal_info = dio_data;
out:
return ret;
}
-static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
- loff_t length, unsigned flags, struct iomap *iomap,
- struct iomap *srcmap)
+static int btrfs_get_blocks_direct(struct inode *inode, sector_t iblock,
+ struct buffer_head *bh_result, int create)
{
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
struct extent_map *em;
struct extent_state *cached_state = NULL;
struct btrfs_dio_data *dio_data = NULL;
+ u64 start = iblock << inode->i_blkbits;
u64 lockstart, lockend;
- const bool write = !!(flags & IOMAP_WRITE);
+ u64 len = bh_result->b_size;
int ret = 0;
- u64 len = length;
- bool unlock_extents = false;
- if (!write)
+ if (!create)
len = min_t(u64, len, fs_info->sectorsize);
lockstart = start;
lockend = start + len - 1;
- /*
- * The generic stuff only does filemap_write_and_wait_range, which
- * isn't enough if we've written compressed pages to this area, so we
- * need to flush the dirty pages again to make absolutely sure that any
- * outstanding dirty pages are on disk.
- */
- if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
- &BTRFS_I(inode)->runtime_flags))
- ret = filemap_fdatawrite_range(inode->i_mapping, start,
- start + length - 1);
-
- dio_data = kzalloc(sizeof(*dio_data), GFP_NOFS);
- if (!dio_data)
- return -ENOMEM;
-
- dio_data->length = length;
- if (write) {
- dio_data->reserve = round_up(length, fs_info->sectorsize);
- ret = btrfs_delalloc_reserve_space(inode,
- &dio_data->data_reserved,
- start, dio_data->reserve);
- if (ret) {
- extent_changeset_free(dio_data->data_reserved);
- kfree(dio_data);
- return ret;
- }
+ if (current->journal_info) {
+ /*
+ * Need to pull our outstanding extents and set journal_info to NULL so
+ * that anything that needs to check if there's a transaction doesn't get
+ * confused.
+ */
+ dio_data = current->journal_info;
+ current->journal_info = NULL;
}
- iomap->private = dio_data;
-
/*
* If this errors out it's because we couldn't invalidate pagecache for
* this range and we need to fallback to buffered.
*/
- if (lock_extent_direct(inode, lockstart, lockend, &cached_state, write)) {
+ if (lock_extent_direct(inode, lockstart, lockend, &cached_state,
+ create)) {
ret = -ENOTBLK;
goto err;
}
goto unlock_err;
}
- len = min(len, em->len - (start - em->start));
- if (write) {
- ret = btrfs_get_blocks_direct_write(&em, inode, dio_data,
- start, len);
+ if (create) {
+ ret = btrfs_get_blocks_direct_write(&em, bh_result, inode,
+ dio_data, start, len);
if (ret < 0)
goto unlock_err;
- unlock_extents = true;
- /* Recalc len in case the new em is smaller than requested */
- len = min(len, em->len - (start - em->start));
+
+ unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart,
+ lockend, &cached_state);
} else {
+ ret = btrfs_get_blocks_direct_read(em, bh_result, inode,
+ start, len);
+ /* Can be negative only if we read from a hole */
+ if (ret < 0) {
+ ret = 0;
+ free_extent_map(em);
+ goto unlock_err;
+ }
/*
* We need to unlock only the end area that we aren't using.
* The rest is going to be unlocked by the endio routine.
*/
- lockstart = start + len;
- if (lockstart < lockend)
- unlock_extents = true;
- }
-
- if (unlock_extents)
- unlock_extent_cached(&BTRFS_I(inode)->io_tree,
- lockstart, lockend, &cached_state);
- else
- free_extent_state(cached_state);
-
- /*
- * Translate extent map information to iomap.
- * We trim the extents (and move the addr) even though iomap code does
- * that, since we have locked only the parts we are performing I/O in.
- */
- if ((em->block_start == EXTENT_MAP_HOLE) ||
- (test_bit(EXTENT_FLAG_PREALLOC, &em->flags) && !write)) {
- iomap->addr = IOMAP_NULL_ADDR;
- iomap->type = IOMAP_HOLE;
- } else {
- iomap->addr = em->block_start + (start - em->start);
- iomap->type = IOMAP_MAPPED;
+ lockstart = start + bh_result->b_size;
+ if (lockstart < lockend) {
+ unlock_extent_cached(&BTRFS_I(inode)->io_tree,
+ lockstart, lockend, &cached_state);
+ } else {
+ free_extent_state(cached_state);
+ }
}
- iomap->offset = start;
- iomap->bdev = fs_info->fs_devices->latest_bdev;
- iomap->length = len;
free_extent_map(em);
unlock_extent_cached(&BTRFS_I(inode)->io_tree, lockstart, lockend,
&cached_state);
err:
- if (dio_data) {
- btrfs_delalloc_release_space(inode, dio_data->data_reserved,
- start, dio_data->reserve, true);
- btrfs_delalloc_release_extents(BTRFS_I(inode), dio_data->reserve);
- extent_changeset_free(dio_data->data_reserved);
- kfree(dio_data);
- }
- return ret;
-}
-
-static int btrfs_dio_iomap_end(struct inode *inode, loff_t pos, loff_t length,
- ssize_t written, unsigned flags, struct iomap *iomap)
-{
- int ret = 0;
- struct btrfs_dio_data *dio_data = iomap->private;
- size_t submitted = dio_data->submitted;
- const bool write = !!(flags & IOMAP_WRITE);
-
- if (!write && (iomap->type == IOMAP_HOLE)) {
- /* If reading from a hole, unlock and return */
- unlock_extent(&BTRFS_I(inode)->io_tree, pos, pos + length - 1);
- goto out;
- }
-
- if (submitted < length) {
- pos += submitted;
- length -= submitted;
- if (write)
- __endio_write_update_ordered(inode, pos, length, false);
- else
- unlock_extent(&BTRFS_I(inode)->io_tree, pos,
- pos + length - 1);
- ret = -ENOTBLK;
- }
-
- if (write) {
- if (dio_data->reserve)
- btrfs_delalloc_release_space(inode,
- dio_data->data_reserved, pos,
- dio_data->reserve, true);
- btrfs_delalloc_release_extents(BTRFS_I(inode), dio_data->length);
- extent_changeset_free(dio_data->data_reserved);
- }
-out:
- kfree(dio_data);
- iomap->private = NULL;
-
+ if (dio_data)
+ current->journal_info = dio_data;
return ret;
}
dip->logical_offset + dip->bytes - 1);
}
- bio_endio(dip->dio_bio);
+ dio_end_io(dip->dio_bio);
kfree(dip);
}
dip->disk_bytenr = (u64)dio_bio->bi_iter.bi_sector << 9;
dip->dio_bio = dio_bio;
refcount_set(&dip->refs, 1);
+
+ if (write) {
+ struct btrfs_dio_data *dio_data = current->journal_info;
+
+ /*
+ * Setting range start and end to the same value means that
+ * no cleanup will happen in btrfs_direct_IO
+ */
+ dio_data->unsubmitted_oe_range_end = dip->logical_offset +
+ dip->bytes;
+ dio_data->unsubmitted_oe_range_start =
+ dio_data->unsubmitted_oe_range_end;
+ }
return dip;
}
-static blk_qc_t btrfs_submit_direct(struct inode *inode, struct iomap *iomap,
- struct bio *dio_bio, loff_t file_offset)
+static void btrfs_submit_direct(struct bio *dio_bio, struct inode *inode,
+ loff_t file_offset)
{
const bool write = (bio_op(dio_bio) == REQ_OP_WRITE);
const bool csum = !(BTRFS_I(inode)->flags & BTRFS_INODE_NODATASUM);
int ret;
blk_status_t status;
struct btrfs_io_geometry geom;
- struct btrfs_dio_data *dio_data = iomap->private;
dip = btrfs_create_dio_private(dio_bio, inode, file_offset);
if (!dip) {
file_offset + dio_bio->bi_iter.bi_size - 1);
}
dio_bio->bi_status = BLK_STS_RESOURCE;
- bio_endio(dio_bio);
- return BLK_QC_T_NONE;
+ dio_end_io(dio_bio);
+ return;
}
if (!write && csum) {
goto out_err;
}
- dio_data->submitted += clone_len;
clone_offset += clone_len;
start_sector += clone_len >> 9;
file_offset += clone_len;
} while (submit_len > 0);
- return BLK_QC_T_NONE;
+ return;
out_err:
dip->dio_bio->bi_status = status;
btrfs_dio_private_put(dip);
- return BLK_QC_T_NONE;
}
-const struct iomap_ops btrfs_dio_iomap_ops = {
- .iomap_begin = btrfs_dio_iomap_begin,
- .iomap_end = btrfs_dio_iomap_end,
-};
+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;
-const struct iomap_dio_ops btrfs_dops = {
- .submit_io = btrfs_submit_direct,
-};
+ 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 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 btrfs_dio_data dio_data = { 0 };
+ struct extent_changeset *data_reserved = NULL;
+ loff_t offset = iocb->ki_pos;
+ size_t count = 0;
+ int flags = 0;
+ bool wakeup = true;
+ bool relock = false;
+ ssize_t ret;
+
+ if (check_direct_IO(fs_info, iter, offset))
+ return 0;
+
+ inode_dio_begin(inode);
+
+ /*
+ * The generic stuff only does filemap_write_and_wait_range, which
+ * isn't enough if we've written compressed pages to this area, so
+ * we need to flush the dirty pages again to make absolutely sure
+ * that any outstanding dirty pages are on disk.
+ */
+ count = iov_iter_count(iter);
+ if (test_bit(BTRFS_INODE_HAS_ASYNC_EXTENT,
+ &BTRFS_I(inode)->runtime_flags))
+ filemap_fdatawrite_range(inode->i_mapping, offset,
+ offset + count - 1);
+
+ 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) {
+ dio_data.overwrite = 1;
+ inode_unlock(inode);
+ relock = true;
+ } else if (iocb->ki_flags & IOCB_NOWAIT) {
+ ret = -EAGAIN;
+ goto out;
+ }
+ ret = btrfs_delalloc_reserve_space(inode, &data_reserved,
+ offset, count);
+ if (ret)
+ goto out;
+
+ /*
+ * We need to know how many extents we reserved so that we can
+ * do the accounting properly if we go over the number we
+ * originally calculated. Abuse current->journal_info for this.
+ */
+ dio_data.reserve = round_up(count,
+ fs_info->sectorsize);
+ dio_data.unsubmitted_oe_range_start = (u64)offset;
+ dio_data.unsubmitted_oe_range_end = (u64)offset;
+ current->journal_info = &dio_data;
+ down_read(&BTRFS_I(inode)->dio_sem);
+ } else if (test_bit(BTRFS_INODE_READDIO_NEED_LOCK,
+ &BTRFS_I(inode)->runtime_flags)) {
+ inode_dio_end(inode);
+ flags = DIO_LOCKING | DIO_SKIP_HOLES;
+ wakeup = false;
+ }
+
+ ret = __blockdev_direct_IO(iocb, inode,
+ fs_info->fs_devices->latest_bdev,
+ iter, btrfs_get_blocks_direct, NULL,
+ btrfs_submit_direct, flags);
+ if (iov_iter_rw(iter) == WRITE) {
+ up_read(&BTRFS_I(inode)->dio_sem);
+ current->journal_info = NULL;
+ if (ret < 0 && ret != -EIOCBQUEUED) {
+ if (dio_data.reserve)
+ btrfs_delalloc_release_space(inode, data_reserved,
+ offset, dio_data.reserve, true);
+ /*
+ * On error we might have left some ordered extents
+ * without submitting corresponding bios for them, so
+ * cleanup them up to avoid other tasks getting them
+ * and waiting for them to complete forever.
+ */
+ if (dio_data.unsubmitted_oe_range_start <
+ dio_data.unsubmitted_oe_range_end)
+ __endio_write_update_ordered(inode,
+ dio_data.unsubmitted_oe_range_start,
+ dio_data.unsubmitted_oe_range_end -
+ dio_data.unsubmitted_oe_range_start,
+ false);
+ } else if (ret >= 0 && (size_t)ret < count)
+ btrfs_delalloc_release_space(inode, data_reserved,
+ offset, count - (size_t)ret, true);
+ btrfs_delalloc_release_extents(BTRFS_I(inode), count);
+ }
+out:
+ if (wakeup)
+ inode_dio_end(inode);
+ if (relock)
+ inode_lock(inode);
+
+ extent_changeset_free(data_reserved);
+ return ret;
+}
static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
__u64 start, __u64 len)
.writepage = btrfs_writepage,
.writepages = btrfs_writepages,
.readahead = btrfs_readahead,
- .direct_IO = noop_direct_IO,
+ .direct_IO = btrfs_direct_IO,
.invalidatepage = btrfs_invalidatepage,
.releasepage = btrfs_releasepage,
#ifdef CONFIG_MIGRATION
projects / platform / kernel / linux-rpi.git / blobdiff