Man page or keyword search:   man All Sections 1 - General Commands 2 - System Calls 3 - Subroutines, Functions 4 - Special Files 5 - File Formats 6 - Games and Screensavers 7 - Macros and Conventions 8 - Maintenence Commands 9 - Kernel Interface New Commands Server 4.4BSD AIX Alpinelinux Archlinux Aros BSDOS BSDi Bifrost CentOS Cygwin Darwin Debian DigitalUNIX DragonFly ElementaryOS Fedora FreeBSD Gentoo GhostBSD HP-UX Haiku Hurd IRIX Inferno JazzOS Kali Knoppix LinuxMint MacOSX Mageia Mandriva Manjaro Minix MirBSD NeXTSTEP NetBSD OPENSTEP OSF1 OpenBSD OpenDarwin OpenIndiana OpenMandriva OpenServer OpenSuSE OpenVMS Oracle PC-BSD Peanut Pidora Plan9 QNX Raspbian RedHat Scientific Slackware SmartOS Solaris SuSE SunOS Syllable Tru64 UNIXv7 Ubuntu Ultrix UnixWare Xenix YellowDog aLinux   26626 pages apropos Keyword Search (all sections) Output format html ascii pdf view pdf save postscript

SB_START_PAGEFAULT(9)		 The Linux VFS		 SB_START_PAGEFAULT(9)

NAME
       sb_start_pagefault - get write access to a superblock from a page fault

SYNOPSIS
       void sb_start_pagefault(struct super_block * sb);

ARGUMENTS
       sb
	   the super we write to

DESCRIPTION
       When a process starts handling write page fault, it should embed the
       operation into sb_start_pagefault - sb_end_pagefault pair to get
       exclusion against file system freezing. This is needed since the page
       fault is going to dirty a page. This function increments number of
       running page faults preventing freezing. If the file system is already
       frozen, the function waits until the file system is thawed.

       Since page fault freeze protection behaves as a lock, users have to
       preserve ordering of freeze protection and other filesystem locks. It
       is advised to put sb_start_pagefault close to mmap_sem in lock
       ordering. Page fault

HANDLING CODE IMPLIES LOCK DEPENDENCY
       mmap_sem -> sb_start_pagefault

COPYRIGHT
Kernel Hackers Manual 2.6.	 November 2013		 SB_START_PAGEFAULT(9)

Vote for polarhome