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btrfs: move priv off stack in btrfs_encoded_read_regular_fill_pages()

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Change btrfs_encoded_read_regular_fill_pages() so that the priv struct
is allocated rather than stored on the stack, in preparation for adding
an asynchronous mode to the function.

Signed-off-by: Mark Harmstone <maharmstone@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Mark Harmstone 2024-10-22 15:50:19 +01:00 • committed by David Sterba
parent 973a432637
commit 68d3b27e05
1 changed files with 18 additions and 11 deletions
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29
fs/btrfs/inode.c
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@ -9085,16 +9085,21 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
struct page **pages)
{
struct btrfs_fs_info *fs_info = inode->root->fs_info;
struct btrfs_encoded_read_private priv = {
.pending = ATOMIC_INIT(1),
};
struct btrfs_encoded_read_private *priv;
unsigned long i = 0;
struct btrfs_bio *bbio;
int ret;
init_waitqueue_head(&priv.wait);
priv = kmalloc(sizeof(struct btrfs_encoded_read_private), GFP_NOFS);
if (!priv)
return -ENOMEM;
init_waitqueue_head(&priv->wait);
atomic_set(&priv->pending, 1);
priv->status = 0;
bbio = btrfs_bio_alloc(BIO_MAX_VECS, REQ_OP_READ, fs_info,
btrfs_encoded_read_endio, &priv);
btrfs_encoded_read_endio, priv);
bbio->bio.bi_iter.bi_sector = disk_bytenr >> SECTOR_SHIFT;
bbio->inode = inode;
@ -9102,11 +9107,11 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
size_t bytes = min_t(u64, disk_io_size, PAGE_SIZE);
if (bio_add_page(&bbio->bio, pages[i], bytes, 0) < bytes) {
atomic_inc(&priv.pending);
atomic_inc(&priv->pending);
btrfs_submit_bbio(bbio, 0);
bbio = btrfs_bio_alloc(BIO_MAX_VECS, REQ_OP_READ, fs_info,
btrfs_encoded_read_endio, &priv);
btrfs_encoded_read_endio, priv);
bbio->bio.bi_iter.bi_sector = disk_bytenr >> SECTOR_SHIFT;
bbio->inode = inode;
continue;
@ -9117,13 +9122,15 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
disk_io_size -= bytes;
} while (disk_io_size);
atomic_inc(&priv.pending);
atomic_inc(&priv->pending);
btrfs_submit_bbio(bbio, 0);
if (atomic_dec_return(&priv.pending))
io_wait_event(priv.wait, !atomic_read(&priv.pending));
if (atomic_dec_return(&priv->pending))
io_wait_event(priv->wait, !atomic_read(&priv->pending));
/* See btrfs_encoded_read_endio() for ordering. */
return blk_status_to_errno(READ_ONCE(priv.status));
ret = blk_status_to_errno(READ_ONCE(priv->status));
kfree(priv);
return ret;
}
ssize_t btrfs_encoded_read_regular(struct kiocb *iocb, struct iov_iter *iter,