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Commit edf064e7 authored by Goldwyn Rodrigues's avatar Goldwyn Rodrigues Committed by Jens Axboe
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btrfs: nowait aio support



Return EAGAIN if any of the following checks fail
 + i_rwsem is not lockable
 + NODATACOW or PREALLOC is not set
 + Cannot nocow at the desired location
 + Writing beyond end of file which is not allocated

Acked-by: default avatarDavid Sterba <dsterba@suse.com>
Signed-off-by: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 29a5d29e
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+27 −6
Original line number Diff line number Diff line
@@ -1875,12 +1875,29 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
	ssize_t num_written = 0;
	bool sync = (file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host);
	ssize_t err;
	loff_t pos;
	size_t count;
	loff_t pos = iocb->ki_pos;
	size_t count = iov_iter_count(from);
	loff_t oldsize;
	int clean_page = 0;

	if ((iocb->ki_flags & IOCB_NOWAIT) &&
			(iocb->ki_flags & IOCB_DIRECT)) {
		/* Don't sleep on inode rwsem */
		if (!inode_trylock(inode))
			return -EAGAIN;
		/*
		 * We will allocate space in case nodatacow is not set,
		 * so bail
		 */
		if (!(BTRFS_I(inode)->flags & (BTRFS_INODE_NODATACOW |
					      BTRFS_INODE_PREALLOC)) ||
		    check_can_nocow(BTRFS_I(inode), pos, &count) <= 0) {
			inode_unlock(inode);
			return -EAGAIN;
		}
	} else
		inode_lock(inode);

	err = generic_write_checks(iocb, from);
	if (err <= 0) {
		inode_unlock(inode);
@@ -1914,8 +1931,6 @@ static ssize_t btrfs_file_write_iter(struct kiocb *iocb,
	 */
	update_time_for_write(inode);

	pos = iocb->ki_pos;
	count = iov_iter_count(from);
	start_pos = round_down(pos, fs_info->sectorsize);
	oldsize = i_size_read(inode);
	if (start_pos > oldsize) {
@@ -3071,13 +3086,19 @@ static loff_t btrfs_file_llseek(struct file *file, loff_t offset, int whence)
	return offset;
}

static int btrfs_file_open(struct inode *inode, struct file *filp)
{
	filp->f_mode |= FMODE_AIO_NOWAIT;
	return generic_file_open(inode, filp);
}

const struct file_operations btrfs_file_operations = {
	.llseek		= btrfs_file_llseek,
	.read_iter      = generic_file_read_iter,
	.splice_read	= generic_file_splice_read,
	.write_iter	= btrfs_file_write_iter,
	.mmap		= btrfs_file_mmap,
	.open		= generic_file_open,
	.open		= btrfs_file_open,
	.release	= btrfs_release_file,
	.fsync		= btrfs_sync_file,
	.fallocate	= btrfs_fallocate,
+3 −0
Original line number Diff line number Diff line
@@ -8754,6 +8754,9 @@ static ssize_t btrfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
			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, offset, count);
		if (ret)