BLOCK_INVALIDATEPAGE(9) The Linux VFS BLOCK_INVALIDATEPAGE(9)NAME
block_invalidatepage - invalidate part of all of a buffer-backed page
SYNOPSIS
void block_invalidatepage(struct page * page, unsigned long offset);
ARGUMENTS
page
the page which is affected
offset
the index of the truncation point
DESCRIPTION
block_invalidatepage is called when all or part of the page has become invalidatedby a truncate operation.
block_invalidatepage does not have to release all buffers, but it must ensure that no dirty buffer is left outside offset and that no I/O
is underway against any of the blocks which are outside the truncation point. Because the caller is about to free (and possibly reuse)
those blocks on-disk.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BLOCK_INVALIDATEPAGE(9)
Check Out this Related Man Page
READAHEAD(2) Linux Programmer's Manual READAHEAD(2)NAME
readahead - perform file readahead into page cache
SYNOPSIS
#define _GNU_SOURCE /* See feature_test_macros(7) */
#include <fcntl.h>
ssize_t readahead(int fd, off64_t offset, size_t count);
DESCRIPTION
readahead() populates the page cache with data from a file so that subsequent reads from that file will not block on disk I/O. The fd
argument is a file descriptor identifying the file which is to be read. The offset argument specifies the starting point from which data
is to be read and count specifies the number of bytes to be read. I/O is performed in whole pages, so that offset is effectively rounded
down to a page boundary and bytes are read up to the next page boundary greater than or equal to (offset+count). readahead() does not read
beyond the end of the file. readahead() blocks until the specified data has been read. The current file offset of the open file referred
to by fd is left unchanged.
RETURN VALUE
On success, readahead() returns 0; on failure, -1 is returned, with errno set to indicate the cause of the error.
ERRORS
EBADF fd is not a valid file descriptor or is not open for reading.
EINVAL fd does not refer to a file type to which readahead() can be applied.
VERSIONS
The readahead() system call appeared in Linux 2.4.13; glibc support has been provided since version 2.3.
CONFORMING TO
The readahead() system call is Linux-specific, and its use should be avoided in portable applications.
SEE ALSO lseek(2), madvise(2), mmap(2), posix_fadvise(2), read(2)COLOPHON
This page is part of release 3.44 of the Linux man-pages project. A description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2010-09-10 READAHEAD(2)
Hi all,
I want to create a new user and grant him ONLY transfer files access to a specific directory where he can only upload and read the files. He should be restricted to this activity only.
Regards (6 Replies)
Hi everyone,
I know the following questions are noobish questions but I am asking them because I am confused about the basics of history behind UNIX and LINUX.
Ok onto business, my questions are-:
Was/Is UNIX ever an open source operating system ?
If UNIX was... (21 Replies)
Hi,
Last 2 weeks I have searched many forums and i haven't found the answer for the question:
How to get all command output to Putty title?
Needed it for other programs to know when some jobs on a server is done and is it done right or wrong. Plink stdout and stdin wasn't working, i used many... (1 Reply)
anyone have any idea how do to this with auth_attr?
I suspect if I grant him
solaris.device.:RO::Device Allocation::help=DevAllocHeader.html
that will work but I'm unsure. Just looking for a second opinion. (10 Replies)
I am looking for a stable, reliable system to replace my current Windows systems in the home. These are simple systems that I purchased from the local Big Box store.
I have heard many good things about Unix and it's various children and it sounds like a good option to me. I have worked... (2 Replies)
We have a lot of scripts using cut as :
cut -c 0-8 --works for cut (GNU coreutils) 5.97, but does not work for cut (GNU coreutils) 8.4.
Gives error -
cut: fields and positions are numbered from 1
Try `cut --help' for more information.
The position needs to start with 1 for later... (6 Replies)
I've got a problem with a proxy configuration. We have an LDAP group that lists all users who are authorised to use the proxy to FTP (usually Filezilla) out to the world, and by implication those not in the group should be denied. My users are delighted that this has been enabled and those that... (9 Replies)
hi folks,
how to using tar with exclude directory and compress it using tar.Z
i only know how to exclude dir only with this command below:
tar -cvf /varios/restore/test.tar -X excludefile.txt /jfma/test1/
how to compress it using 1 command?
Thanx
Please use CODE tags as... (6 Replies)
Hello All,
I had recently learnt a bit of Docker(which provides containerization process).
Here are some of my learning points from it.
Let us start first with very basic question:
What is Docker:
Docker is a platform for sysadmins and developers to DEPLOY, DEVELOP and RUN applications ... (7 Replies)
What is the point of this? Whenever I close my shell it appends to the history file without adding this. I have never seen it overwrite my history file.
# When the shell exits, append to the history file instead of overwriting it
shopt -s histappend (3 Replies)
Hello for all,
I am testing the behavior of a 32 bit application running on Solaris 5.10 (SPARC), and realize it reaches 4GB of memory and then crashes.
It doesn't matter the amount of used memory as application is intended to perform many transactions; rather, what I want to achieve is to... (2 Replies)