a1e09b03e6
Make f2fs_file_read_iter() and f2fs_file_write_iter() use the iomap direct I/O implementation instead of the fs/direct-io.c one. The iomap implementation is more efficient, and it also avoids the need to add new features and optimizations to the old implementation. This new implementation also eliminates the need for f2fs to hook bio submission and completion and to allocate memory per-bio. This is because it's possible to correctly update f2fs's in-flight DIO counters using __iomap_dio_rw() in combination with an implementation of iomap_dio_ops::end_io() (as suggested by Christoph Hellwig). When possible, this new implementation preserves existing f2fs behavior such as the conditions for falling back to buffered I/O. This patch has been tested with xfstests by running 'gce-xfstests -c f2fs -g auto -X generic/017' with and without this patch; no regressions were seen. (Some tests fail both before and after. generic/017 hangs both before and after, so it had to be excluded.) Signed-off-by: Eric Biggers <ebiggers@google.com> [Jaegeuk Kim: use spin_lock_bh for f2fs_update_iostat in softirq] Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org> |
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| arch | ||
| block | ||
| certs | ||
| crypto | ||
| Documentation | ||
| drivers | ||
| fs | ||
| include | ||
| init | ||
| ipc | ||
| kernel | ||
| lib | ||
| LICENSES | ||
| mm | ||
| net | ||
| samples | ||
| scripts | ||
| security | ||
| sound | ||
| tools | ||
| usr | ||
| virt | ||
| .clang-format | ||
| .cocciconfig | ||
| .get_maintainer.ignore | ||
| .gitattributes | ||
| .gitignore | ||
| .mailmap | ||
| 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 Restructured Text 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.