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From 82a40d2b088b5207ecb8f8861ebd4babfd10385a Mon Sep 17 00:00:00 2001
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From: Jan Chaloupka <jchaloup@redhat.com>
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Date: Mon, 27 Oct 2014 13:02:32 +0100
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Subject: [PATCH] madvise.2 MADV_REMOVE supports more filesystems
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---
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man-pages/en/man2/madvise.2 | 20 ++++++++++++++------
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man-pages/man2/fallocate.2 | 11 +++++++++++
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man-pages/man2/madvise.2 | 20 ++++++++++++++------
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3 files changed, 39 insertions(+), 12 deletions(-)
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diff --git a/man-pages/en/man2/madvise.2 b/man-pages/en/man2/madvise.2
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index 4e693da..460726a 100644
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--- a/man-pages/en/man2/madvise.2
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+++ b/man-pages/en/man2/madvise.2
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@@ -101,11 +101,18 @@ without an underlying file.
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.BR MADV_REMOVE " (Since Linux 2.6.16)"
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Free up a given range of pages
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and its associated backing store.
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-Currently,
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-.\" 2.6.18-rc5
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-only shmfs/tmpfs supports this; other file systems return with the
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-error
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-.BR ENOSYS .
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+Originally, only shmfs/tmpfs supported this; but since Linux 3.5,
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+any filesystem which supports the
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+.BR fallocate(2)
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+mode
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+.BR FALLOC_FL_PUNCH_HOLE
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+also supports the
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+.BR madvise(2)
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+advice
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+.BR MADV_REMOVE .
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+Other filesystems return with the
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+.BR EOPNOTSUPP
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+error.
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.\" Databases want to use this feature to drop a section of their
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.\" bufferpool (shared memory segments) - without writing back to
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.\" disk/swap space. This feature is also useful for supporting
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@@ -375,7 +382,8 @@ from the system call, as it should).
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.BR mprotect (2),
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.BR msync (2),
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.BR munmap (2),
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-.BR core (5)
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+.BR core (5),
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+.BR fallocate (2)
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.SH COLOPHON
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This page is part of release 3.53 of the Linux
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.I man-pages
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diff --git a/man-pages/man2/fallocate.2 b/man-pages/man2/fallocate.2
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index be9dbcd..4e68a3f 100644
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--- a/man-pages/man2/fallocate.2
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+++ b/man-pages/man2/fallocate.2
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@@ -109,6 +109,17 @@ does not change.
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Not all file systems support
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.BR FALLOC_FL_PUNCH_HOLE ;
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if a file system doesn't support the operation, an error is returned.
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+The operation is supported on at least the following filesystems:
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+.IP * 3
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+XFS (since Linux 2.6.38)
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+.IP *
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+ext4 (since Linux 3.0)
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+.\" commit a4bb6b64e39abc0e41ca077725f2a72c868e7622
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+.IP *
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+Btrfs (since Linux 3.7)
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+.IP *
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+tmpfs (since Linux 3.5)
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+.\" commit 83e4fa9c16e4af7122e31be3eca5d57881d236fe
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.SH RETURN VALUE
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On success,
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.BR fallocate ()
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diff --git a/man-pages/man2/madvise.2 b/man-pages/man2/madvise.2
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index 4e693da..460726a 100644
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--- a/man-pages/man2/madvise.2
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+++ b/man-pages/man2/madvise.2
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@@ -101,11 +101,18 @@ without an underlying file.
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.BR MADV_REMOVE " (Since Linux 2.6.16)"
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Free up a given range of pages
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c2a259 |
and its associated backing store.
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c2a259 |
-Currently,
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-.\" 2.6.18-rc5
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-only shmfs/tmpfs supports this; other file systems return with the
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-error
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-.BR ENOSYS .
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+Originally, only shmfs/tmpfs supported this; but since Linux 3.5,
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+any filesystem which supports the
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+.BR fallocate(2)
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+mode
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+.BR FALLOC_FL_PUNCH_HOLE
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+also supports the
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+.BR madvise(2)
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+advice
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+.BR MADV_REMOVE .
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+Other filesystems return with the
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+.BR EOPNOTSUPP
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+error.
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.\" Databases want to use this feature to drop a section of their
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c2a259 |
.\" bufferpool (shared memory segments) - without writing back to
|
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c2a259 |
.\" disk/swap space. This feature is also useful for supporting
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c2a259 |
@@ -375,7 +382,8 @@ from the system call, as it should).
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c2a259 |
.BR mprotect (2),
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c2a259 |
.BR msync (2),
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c2a259 |
.BR munmap (2),
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-.BR core (5)
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+.BR core (5),
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+.BR fallocate (2)
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c2a259 |
.SH COLOPHON
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c2a259 |
This page is part of release 3.53 of the Linux
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.I man-pages
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--
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1.9.3
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