2005-04-17 02:20:36 +04:00
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/*
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* Cache operations for Coda.
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* For Linux 2.1: (C) 1997 Carnegie Mellon University
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* For Linux 2.3: (C) 2000 Carnegie Mellon University
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*
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* Carnegie Mellon encourages users of this code to contribute improvements
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* to the Coda project http://www.coda.cs.cmu.edu/ <coda@cs.cmu.edu>.
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*/
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/time.h>
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#include <linux/fs.h>
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#include <linux/stat.h>
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#include <linux/errno.h>
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2014-08-09 01:20:33 +04:00
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#include <linux/uaccess.h>
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2005-04-17 02:20:36 +04:00
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#include <linux/string.h>
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#include <linux/list.h>
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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-21 01:22:52 +04:00
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#include <linux/sched.h>
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2010-10-25 10:03:44 +04:00
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#include <linux/spinlock.h>
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2005-04-17 02:20:36 +04:00
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#include <linux/coda.h>
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#include <linux/coda_psdev.h>
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2011-01-13 00:36:09 +03:00
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#include "coda_linux.h"
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#include "coda_cache.h"
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2005-04-17 02:20:36 +04:00
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static atomic_t permission_epoch = ATOMIC_INIT(0);
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/* replace or extend an acl cache hit */
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void coda_cache_enter(struct inode *inode, int mask)
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{
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struct coda_inode_info *cii = ITOC(inode);
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2010-10-25 10:03:44 +04:00
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spin_lock(&cii->c_lock);
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2005-04-17 02:20:36 +04:00
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cii->c_cached_epoch = atomic_read(&permission_epoch);
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2013-01-31 07:36:06 +04:00
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if (!uid_eq(cii->c_uid, current_fsuid())) {
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2008-11-14 02:38:48 +03:00
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cii->c_uid = current_fsuid();
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2005-04-17 02:20:36 +04:00
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cii->c_cached_perm = mask;
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} else
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cii->c_cached_perm |= mask;
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2010-10-25 10:03:44 +04:00
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spin_unlock(&cii->c_lock);
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2005-04-17 02:20:36 +04:00
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}
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/* remove cached acl from an inode */
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void coda_cache_clear_inode(struct inode *inode)
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{
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struct coda_inode_info *cii = ITOC(inode);
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2010-10-25 10:03:44 +04:00
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spin_lock(&cii->c_lock);
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2007-07-19 12:48:42 +04:00
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cii->c_cached_epoch = atomic_read(&permission_epoch) - 1;
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2010-10-25 10:03:44 +04:00
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spin_unlock(&cii->c_lock);
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2005-04-17 02:20:36 +04:00
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}
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/* remove all acl caches */
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void coda_cache_clear_all(struct super_block *sb)
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{
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atomic_inc(&permission_epoch);
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}
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/* check if the mask has been matched against the acl already */
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int coda_cache_check(struct inode *inode, int mask)
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{
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struct coda_inode_info *cii = ITOC(inode);
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2010-10-25 10:03:44 +04:00
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int hit;
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2005-04-17 02:20:36 +04:00
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2010-10-25 10:03:44 +04:00
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spin_lock(&cii->c_lock);
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hit = (mask & cii->c_cached_perm) == mask &&
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2013-01-31 07:36:06 +04:00
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uid_eq(cii->c_uid, current_fsuid()) &&
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2010-10-25 10:03:44 +04:00
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cii->c_cached_epoch == atomic_read(&permission_epoch);
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spin_unlock(&cii->c_lock);
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2005-04-17 02:20:36 +04:00
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2010-10-25 10:03:44 +04:00
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return hit;
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2005-04-17 02:20:36 +04:00
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}
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/* Purging dentries and children */
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/* The following routines drop dentries which are not
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in use and flag dentries which are in use to be
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zapped later.
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The flags are detected by:
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- coda_dentry_revalidate (for lookups) if the flag is C_PURGE
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- coda_dentry_delete: to remove dentry from the cache when d_count
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falls to zero
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- an inode method coda_revalidate (for attributes) if the
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flag is C_VATTR
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*/
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/* this won't do any harm: just flag all children */
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static void coda_flag_children(struct dentry *parent, int flag)
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{
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struct dentry *de;
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2011-01-07 09:49:34 +03:00
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spin_lock(&parent->d_lock);
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2014-10-27 02:19:16 +03:00
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list_for_each_entry(de, &parent->d_subdirs, d_child) {
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2005-04-17 02:20:36 +04:00
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/* don't know what to do with negative dentries */
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2015-03-18 01:25:59 +03:00
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if (d_inode(de) )
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coda_flag_inode(d_inode(de), flag);
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2005-04-17 02:20:36 +04:00
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}
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2011-01-07 09:49:34 +03:00
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spin_unlock(&parent->d_lock);
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2005-04-17 02:20:36 +04:00
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return;
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}
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void coda_flag_inode_children(struct inode *inode, int flag)
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{
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struct dentry *alias_de;
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if ( !inode || !S_ISDIR(inode->i_mode))
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return;
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alias_de = d_find_alias(inode);
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if (!alias_de)
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return;
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coda_flag_children(alias_de, flag);
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shrink_dcache_parent(alias_de);
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dput(alias_de);
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}
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