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