forked from mirrors/linux
34310c442e
Add an io_uring command for encoded reads, using the same interface as the existing BTRFS_IOC_ENCODED_READ ioctl. btrfs_uring_encoded_read() is an io_uring version of btrfs_ioctl_encoded_read(), which validates the user input and calls btrfs_encoded_read() to read the appropriate metadata. If we determine that we need to read an extent from disk, we call btrfs_encoded_read_regular_fill_pages() through btrfs_uring_read_extent() to prepare the bio. The existing btrfs_encoded_read_regular_fill_pages() is changed so that if it is passed a valid uring_ctx, rather than waking up any waiting threads it calls btrfs_uring_read_extent_endio(). This in turn copies the read data back to userspace, and calls io_uring_cmd_done() to complete the io_uring command. Because we're potentially doing a non-blocking read, btrfs_uring_read_extent() doesn't clean up after itself if it returns -EIOCBQUEUED. Instead, it allocates a priv struct, populates the fields there that we will need to unlock the inode and free our allocations, and defers this to the btrfs_uring_read_finished() that gets called when the bio completes. Signed-off-by: Mark Harmstone <maharmstone@fb.com> Reviewed-by: David Sterba <dsterba@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>
28 lines
977 B
C
28 lines
977 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef BTRFS_IOCTL_H
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#define BTRFS_IOCTL_H
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#include <linux/types.h>
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struct file;
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struct dentry;
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struct mnt_idmap;
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struct fileattr;
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struct btrfs_fs_info;
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struct btrfs_ioctl_balance_args;
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long btrfs_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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long btrfs_compat_ioctl(struct file *file, unsigned int cmd, unsigned long arg);
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int btrfs_fileattr_get(struct dentry *dentry, struct fileattr *fa);
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int btrfs_fileattr_set(struct mnt_idmap *idmap,
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struct dentry *dentry, struct fileattr *fa);
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int btrfs_ioctl_get_supported_features(void __user *arg);
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void btrfs_sync_inode_flags_to_i_flags(struct inode *inode);
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int __pure btrfs_is_empty_uuid(const u8 *uuid);
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void btrfs_update_ioctl_balance_args(struct btrfs_fs_info *fs_info,
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struct btrfs_ioctl_balance_args *bargs);
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int btrfs_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags);
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void btrfs_uring_read_extent_endio(void *ctx, int err);
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#endif
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