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David Howells bd80d8a80e afs: Use ITER_XARRAY for writing 
Use a single ITER_XARRAY iterator to describe the portion of a file to be
transmitted to the server rather than generating a series of small
ITER_BVEC iterators on the fly.  This will make it easier to implement AIO
in afs.

In theory we could maybe use one giant ITER_BVEC, but that means
potentially allocating a huge array of bio_vec structs (max 256 per page)
when in fact the pagecache already has a structure listing all the relevant
pages (radix_tree/xarray) that can be walked over.

Signed-off-by: David Howells <dhowells@redhat.com>
Tested-By: Marc Dionne <marc.dionne@auristor.com>
cc: linux-afs@lists.infradead.org
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
Link: https://lore.kernel.org/r/153685395197.14766.16289516750731233933.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/158861251312.340223.17924900795425422532.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/159465828607.1377938.6903132788463419368.stgit@warthog.procyon.org.uk/
Link: https://lore.kernel.org/r/160588535018.3465195.14509994354240338307.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161118152415.1232039.6452879415814850025.stgit@warthog.procyon.org.uk/ # rfc
Link: https://lore.kernel.org/r/161161048194.2537118.13763612220937637316.stgit@warthog.procyon.org.uk/ # v2
Link: https://lore.kernel.org/r/161340411602.1303470.4661108879482218408.stgit@warthog.procyon.org.uk/ # v3
Link: https://lore.kernel.org/r/161539555629.286939.5241869986617154517.stgit@warthog.procyon.org.uk/ # v4
Link: https://lore.kernel.org/r/161653811456.2770958.7017388543246759245.stgit@warthog.procyon.org.uk/ # v5
Link: https://lore.kernel.org/r/161789095005.6155.6789055030327407928.stgit@warthog.procyon.org.uk/ # v6
2021-04-23 10:17:27 +01:00
arch Boundary condition fixes for bugs unearthed by the perf fuzzer. 2021-03-21 11:26:21 -07:00
block
certs
crypto
Documentation netfs: Documentation for helper library 2021-04-23 10:14:32 +01:00
drivers Three fixes for the Qualcomm clk driver, two for regressions this merge 2021-03-24 11:26:50 -07:00
fs afs: Use ITER_XARRAY for writing 2021-04-23 10:17:27 +01:00
include afs: Use ITER_XARRAY for writing 2021-04-23 10:17:27 +01:00
init
ipc
kernel io_uring-5.12-2021-03-21 2021-03-21 12:25:54 -07:00
lib iov_iter: Add ITER_XARRAY 2021-04-23 09:15:32 +01:00
LICENSES
mm mm: Implement readahead_control pageset expansion 2021-04-23 10:14:29 +01:00
net afs: Don't truncate iter during data fetch 2021-04-23 10:17:26 +01:00
samples
scripts
security selinux/stable-5.12 PR 20210322 2021-03-22 11:34:31 -07:00
sound
tools linux-kselftest-kunit-fixes-5.12-rc5.1 2021-03-23 10:18:08 -07:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
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Makefile Linux 5.12-rc4 2021-03-21 14:56:43 -07:00
README

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.