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A mirror of the official Linux kernel repository just in case
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> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| io_uring | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| rust | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .editorconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| .rustfmt.toml | ||
| COPYING | ||
| CREDITS | ||
| Kbuild | ||
| Kconfig | ||
| MAINTAINERS | ||
| Makefile | ||
| README | ||
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.