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tty, proc, kernfs, random: Use copy_splice_read() 

JIRA: https://issues.redhat.com/browse/RHEL-27742

This patch is a backport of the following upstream commit:
commit b0072734ffaa3f5fec64058d0d3333765d789bc0
Author: David Howells <dhowells@redhat.com>
Date:   Mon May 22 14:49:59 2023 +0100

    tty, proc, kernfs, random: Use copy_splice_read()

    Use copy_splice_read() for tty, procfs, kernfs and random files rather
    than going through generic_file_splice_read() as they just copy the file
    into the output buffer and don't splice pages.  This avoids the need for
    them to have a ->read_folio() to satisfy filemap_splice_read().

    Signed-off-by: David Howells <dhowells@redhat.com>
    Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    cc: Christoph Hellwig <hch@lst.de>
    cc: Jens Axboe <axboe@kernel.dk>
    cc: Al Viro <viro@zeniv.linux.org.uk>
    cc: John Hubbard <jhubbard@nvidia.com>
    cc: David Hildenbrand <david@redhat.com>
    cc: Matthew Wilcox <willy@infradead.org>
    cc: Miklos Szeredi <miklos@szeredi.hu>
    cc: Arnd Bergmann <arnd@arndb.de>
    cc: linux-block@vger.kernel.org
    cc: linux-fsdevel@vger.kernel.org
    cc: linux-mm@kvack.org
    Link: https://lore.kernel.org/r/20230522135018.2742245-13-dhowells@redhat.com
    Signed-off-by: Jens Axboe <axboe@kernel.dk>

Signed-off-by: Rafael Aquini <raquini@redhat.com>
This commit is contained in:
Rafael Aquini 2024-09-05 20:32:06 -04:00
parent 0a98879655
commit 800fb8128b
6 changed files with 11 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
drivers/char/random.c
View File

@ -1646,7 +1646,7 @@ const struct file_operations random_fops = {
.compat_ioctl = compat_ptr_ioctl,
.fasync = random_fasync,
.llseek = noop_llseek,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.splice_write = iter_file_splice_write,
};
@ -1658,7 +1658,7 @@ const struct file_operations urandom_fops = {
.compat_ioctl = compat_ptr_ioctl,
.fasync = random_fasync,
.llseek = noop_llseek,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.splice_write = iter_file_splice_write,
};

4
drivers/tty/tty_io.c
View File

@ -465,7 +465,7 @@ static const struct file_operations tty_fops = {
.llseek = no_llseek,
.read_iter = tty_read,
.write_iter = tty_write,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.splice_write = iter_file_splice_write,
.poll = tty_poll,
.unlocked_ioctl = tty_ioctl,
@ -480,7 +480,7 @@ static const struct file_operations console_fops = {
.llseek = no_llseek,
.read_iter = tty_read,
.write_iter = redirected_tty_write,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.splice_write = iter_file_splice_write,
.poll = tty_poll,
.unlocked_ioctl = tty_ioctl,

2
fs/kernfs/file.c
View File

@ -1012,7 +1012,7 @@ const struct file_operations kernfs_file_fops = {
.release = kernfs_fop_release,
.poll = kernfs_fop_poll,
.fsync = noop_fsync,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.splice_write = iter_file_splice_write,
};

4
fs/proc/inode.c
View File

@ -586,7 +586,7 @@ static const struct file_operations proc_iter_file_ops = {
.llseek = proc_reg_llseek,
.read_iter = proc_reg_read_iter,
.write = proc_reg_write,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.poll = proc_reg_poll,
.unlocked_ioctl = proc_reg_unlocked_ioctl,
.mmap = proc_reg_mmap,
@ -612,7 +612,7 @@ static const struct file_operations proc_reg_file_ops_compat = {
static const struct file_operations proc_iter_file_ops_compat = {
.llseek = proc_reg_llseek,
.read_iter = proc_reg_read_iter,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.write = proc_reg_write,
.poll = proc_reg_poll,
.unlocked_ioctl = proc_reg_unlocked_ioctl,

2
fs/proc/proc_sysctl.c
View File

@ -869,7 +869,7 @@ static const struct file_operations proc_sys_file_operations = {
.poll = proc_sys_poll,
.read_iter = proc_sys_read,
.write_iter = proc_sys_write,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.splice_write = iter_file_splice_write,
.llseek = default_llseek,
};

6
fs/proc_namespace.c
View File

@ -324,7 +324,7 @@ static int mountstats_open(struct inode *inode, struct file *file)
const struct file_operations proc_mounts_operations = {
.open = mounts_open,
.read_iter = seq_read_iter,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.llseek = seq_lseek,
.release = mounts_release,
.poll = mounts_poll,
@ -333,7 +333,7 @@ const struct file_operations proc_mounts_operations = {
const struct file_operations proc_mountinfo_operations = {
.open = mountinfo_open,
.read_iter = seq_read_iter,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.llseek = seq_lseek,
.release = mounts_release,
.poll = mounts_poll,
@ -342,7 +342,7 @@ const struct file_operations proc_mountinfo_operations = {
const struct file_operations proc_mountstats_operations = {
.open = mountstats_open,
.read_iter = seq_read_iter,
.splice_read = generic_file_splice_read,
.splice_read = copy_splice_read,
.llseek = seq_lseek,
.release = mounts_release,
};