Merging upstream version 6.8.

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 0 insertions, 206 deletions

diff --git a/man2/ioctl_pagemap_scan.2 b/man2/ioctl_pagemap_scan.2
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--- a/man2/ioctl_pagemap_scan.2
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-.\" This manpage is Copyright (C) 2023 Collabora;
-.\" Written by Muhammad Usama Anjum <usama.anjum@collabora.com>
-.\"
-.\" SPDX-License-Identifier: Linux-man-pages-copyleft
-.\"
-.TH ioctl_pagemap_scan 2 2024-01-28 "Linux man-pages 6.7"
-.SH NAME
-ioctl_pagemap_scan \- get and/or clear page flags
-.SH LIBRARY
-Standard C library
-.RI ( libc ", " \-lc )
-.SH SYNOPSIS
-.nf
-.BR "#include <linux/fs.h>" "  /* Definition of " "struct pm_scan_arg" ,
-.BR "                          struct page_region" ", and " PAGE_IS_* " constants */"
-.B #include <sys/ioctl.h>
-.P
-.BI "int ioctl(int " pagemap_fd ", PAGEMAP_SCAN, struct pm_scan_arg *" arg );
-.fi
-.SH DESCRIPTION
-This
-.BR ioctl (2)
-is used to get and optionally clear some specific flags from page table entries.
-The information is returned with
-.B PAGE_SIZE
-granularity.
-.P
-To start tracking the written state (flag) of a page or range of memory,
-the
-.B UFFD_FEATURE_WP_ASYNC
-must be enabled by
-.B UFFDIO_API
-.BR ioctl (2)
-on
-.B userfaultfd
-and memory range must be registered with
-.B UFFDIO_REGISTER
-.BR ioctl (2)
-in
-.B UFFDIO_REGISTER_MODE_WP
-mode.
-.SS Supported page flags
-The following page table entry flags are supported:
-.TP
-.B PAGE_IS_WPALLOWED
-The page has asynchronous write-protection enabled.
-.TP
-.B PAGE_IS_WRITTEN
-The page has been written to from the time it was write protected.
-.TP
-.B PAGE_IS_FILE
-The page is file backed.
-.TP
-.B PAGE_IS_PRESENT
-The page is present in the memory.
-.TP
-.B PAGE_IS_SWAPPED
-The page is swapped.
-.TP
-.B PAGE_IS_PFNZERO
-The page has zero PFN.
-.TP
-.B PAGE_IS_HUGE
-The page is THP or Hugetlb backed.
-.SS Supported operations
-The get operation is always performed
-if the output buffer is specified.
-The other operations are as following:
-.TP
-.B PM_SCAN_WP_MATCHING
-Write protect the matched pages.
-.TP
-.B PM_SCAN_CHECK_WPASYNC
-Abort the scan
-when a page is found
-which doesn't have the Userfaultfd Asynchronous Write protection enabled.
-.SS The \f[I]struct pm_scan_arg\f[] argument
-.EX
-struct pm_scan_arg {
-    __u64  size;
-    __u64  flags;
-    __u64  start;
-    __u64  end;
-    __u64  walk_end;
-    __u64  vec;
-    __u64  vec_len;
-    __u64  max_pages
-    __u64  category_inverted;
-    __u64  category_mask;
-    __u64  category_anyof_mask
-    __u64  return_mask;
-};
-.EE
-.TP
-.B size
-This field should be set to the size of the structure in bytes,
-as in
-.IR sizeof(struct\~pm_scan_arg) .
-.TP
-.B flags
-The operations to be performed are specified in it.
-.TP
-.B start
-The starting address of the scan is specified in it.
-.TP
-.B end
-The ending address of the scan is specified in it.
-.TP
-.B walk_end
-The kernel returns the scan's ending address in it.
-The
-.I walk_end
-equal to
-.I end
-means that scan has completed on the entire range.
-.TP
-.B vec
-The address of
-.I page_region
-array for output.
-.IP
-.in +4n
-.EX
-struct page_region {
-    __u64  start;
-    __u64  end;
-    __u64  categories;
-};
-.EE
-.in
-.TP
-.B vec_len
-The length of the
-.I page_region
-struct array.
-.TP
-.B max_pages
-It is the optional limit for the number of output pages required.
-.TP
-.B category_inverted
-.BI PAGE_IS_ *
-categories which values match if 0 instead of 1.
-.TP
-.B category_mask
-Skip pages for which any
-.BI PAGE_IS_ *
-category doesn't match.
-.TP
-.B category_anyof_mask
-Skip pages for which no
-.BI PAGE_IS_ *
-category matches.
-.TP
-.B return_mask
-.BI PAGE_IS_ *
-categories that are to be reported in
-.IR page_region .
-.SH RETURN VALUE
-On error, \-1 is returned, and
-.I errno
-is set to indicate the error.
-.SH ERRORS
-Error codes can be one of, but are not limited to, the following:
-.TP
-.B EINVAL
-Invalid arguments i.e.,
-invalid
-.I size
-of the argument,
-invalid
-.IR flags ,
-invalid
-.IR categories ,
-the
-.I start
-address isn't aligned with
-.BR PAGE_SIZE ,
-or
-.I vec_len
-is specified when
-.I vec
-is NULL.
-.TP
-.B EFAULT
-Invalid
-.I arg
-pointer,
-invalid
-.I vec
-pointer,
-or invalid address range specified by
-.I start
-and
-.IR end .
-.TP
-.B ENOMEM
-No memory is available.
-.TP
-.B EINTR
-Fetal signal is pending.
-.SH STANDARDS
-Linux.
-.SH HISTORY
-Linux 6.7.
-.SH SEE ALSO
-.BR ioctl (2)