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btrfs: allocate dio_data on stack 

Make use of the new iomap_iter->private field to avoid a memory
allocation per iomap range.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2022-05-05 15:11:12 -05:00 committed by David Sterba
parent 786f847f43
commit 491a6d0118
1 changed files with 11 additions and 23 deletions
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34
fs/btrfs/inode.c
View File

@ -7546,10 +7546,11 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
loff_t length, unsigned int flags, struct iomap *iomap,
struct iomap *srcmap)
{
struct iomap_iter *iter = container_of(iomap, struct iomap_iter, iomap);
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;
struct btrfs_dio_data *dio_data = iter->private;
u64 lockstart, lockend;
const bool write = !!(flags & IOMAP_WRITE);
int ret = 0;
@ -7595,17 +7596,7 @@ static int btrfs_dio_iomap_begin(struct inode *inode, loff_t start,
}
}
if (flags & IOMAP_NOWAIT) {
dio_data = kzalloc(sizeof(*dio_data), GFP_NOWAIT);
if (!dio_data)
return -EAGAIN;
} else {
dio_data = kzalloc(sizeof(*dio_data), GFP_NOFS);
if (!dio_data)
return -ENOMEM;
}
iomap->private = dio_data;
memset(dio_data, 0, sizeof(*dio_data));
/*
* We always try to allocate data space and must do it before locking
@ -7769,23 +7760,22 @@ err:
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 int flags, struct iomap *iomap)
{
int ret = 0;
struct btrfs_dio_data *dio_data = iomap->private;
struct iomap_iter *iter = container_of(iomap, struct iomap_iter, iomap);
struct btrfs_dio_data *dio_data = iter->private;
size_t submitted = dio_data->submitted;
const bool write = !!(flags & IOMAP_WRITE);
int ret = 0;
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;
return 0;
}
if (submitted < length) {
@ -7802,10 +7792,6 @@ static int btrfs_dio_iomap_end(struct inode *inode, loff_t pos, loff_t length,
if (write)
extent_changeset_free(dio_data->data_reserved);
out:
kfree(dio_data);
iomap->private = NULL;
return ret;
}
@ -8041,7 +8027,7 @@ static void btrfs_submit_direct(const struct iomap_iter *iter,
int ret;
blk_status_t status;
struct btrfs_io_geometry geom;
struct btrfs_dio_data *dio_data = iter->iomap.private;
struct btrfs_dio_data *dio_data = iter->private;
struct extent_map *em = NULL;
dip = btrfs_create_dio_private(dio_bio, inode, file_offset);
@ -8166,8 +8152,10 @@ static const struct iomap_dio_ops btrfs_dio_ops = {
ssize_t btrfs_dio_rw(struct kiocb *iocb, struct iov_iter *iter, size_t done_before)
{
struct btrfs_dio_data data;
return iomap_dio_rw(iocb, iter, &btrfs_dio_iomap_ops, &btrfs_dio_ops,
IOMAP_DIO_PARTIAL, NULL, done_before);
IOMAP_DIO_PARTIAL, &data, done_before);
}
static int btrfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,