cregit-Linux how code gets into the kernel

Release 4.10 fs/coda/cache.c

Directory: fs/coda
/*
 * Cache operations for Coda.
 * For Linux 2.1: (C) 1997 Carnegie Mellon University
 * For Linux 2.3: (C) 2000 Carnegie Mellon University
 *
 * Carnegie Mellon encourages users of this code to contribute improvements
 * to the Coda project http://www.coda.cs.cmu.edu/ <coda@cs.cmu.edu>.
 */

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/time.h>
#include <linux/fs.h>
#include <linux/stat.h>
#include <linux/errno.h>
#include <linux/uaccess.h>
#include <linux/string.h>
#include <linux/list.h>
#include <linux/sched.h>
#include <linux/spinlock.h>

#include <linux/coda.h>
#include <linux/coda_psdev.h>
#include "coda_linux.h"
#include "coda_cache.h"


static atomic_t permission_epoch = ATOMIC_INIT(0);

/* replace or extend an acl cache hit */

void coda_cache_enter(struct inode *inode, int mask) { struct coda_inode_info *cii = ITOC(inode); spin_lock(&cii->c_lock); cii->c_cached_epoch = atomic_read(&permission_epoch); if (!uid_eq(cii->c_uid, current_fsuid())) { cii->c_uid = current_fsuid(); cii->c_cached_perm = mask; } else cii->c_cached_perm |= mask; spin_unlock(&cii->c_lock); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git4654.76%550.00%
yoshihisa abeyoshihisa abe1619.05%110.00%
jan harkesjan harkes1315.48%220.00%
eric w. biedermaneric w. biederman55.95%110.00%
david howellsdavid howells44.76%110.00%
Total84100.00%10100.00%

/* remove cached acl from an inode */
void coda_cache_clear_inode(struct inode *inode) { struct coda_inode_info *cii = ITOC(inode); spin_lock(&cii->c_lock); cii->c_cached_epoch = atomic_read(&permission_epoch) - 1; spin_unlock(&cii->c_lock); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git2450.00%466.67%
yoshihisa abeyoshihisa abe1633.33%116.67%
jan harkesjan harkes816.67%116.67%
Total48100.00%6100.00%

/* remove all acl caches */
void coda_cache_clear_all(struct super_block *sb) { atomic_inc(&permission_epoch); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git1487.50%150.00%
jan harkesjan harkes212.50%150.00%
Total16100.00%2100.00%

/* check if the mask has been matched against the acl already */
int coda_cache_check(struct inode *inode, int mask) { struct coda_inode_info *cii = ITOC(inode); int hit; spin_lock(&cii->c_lock); hit = (mask & cii->c_cached_perm) == mask && uid_eq(cii->c_uid, current_fsuid()) && cii->c_cached_epoch == atomic_read(&permission_epoch); spin_unlock(&cii->c_lock); return hit; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git4457.14%444.44%
yoshihisa abeyoshihisa abe1620.78%111.11%
jan harkesjan harkes1114.29%222.22%
eric w. biedermaneric w. biederman45.19%111.11%
david howellsdavid howells22.60%111.11%
Total77100.00%9100.00%

/* Purging dentries and children */ /* The following routines drop dentries which are not in use and flag dentries which are in use to be zapped later. The flags are detected by: - coda_dentry_revalidate (for lookups) if the flag is C_PURGE - coda_dentry_delete: to remove dentry from the cache when d_count falls to zero - an inode method coda_revalidate (for attributes) if the flag is C_VATTR */ /* this won't do any harm: just flag all children */
static void coda_flag_children(struct dentry *parent, int flag) { struct dentry *de; spin_lock(&parent->d_lock); list_for_each_entry(de, &parent->d_subdirs, d_child) { /* don't know what to do with negative dentries */ if (d_inode(de) ) coda_flag_inode(d_inode(de), flag); } spin_unlock(&parent->d_lock); return; }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git4265.62%555.56%
nick pigginnick piggin1218.75%111.11%
david howellsdavid howells69.38%111.11%
al viroal viro46.25%222.22%
Total64100.00%9100.00%


void coda_flag_inode_children(struct inode *inode, int flag) { struct dentry *alias_de; if ( !inode || !S_ISDIR(inode->i_mode)) return; alias_de = d_find_alias(inode); if (!alias_de) return; coda_flag_children(alias_de, flag); shrink_dcache_parent(alias_de); dput(alias_de); }

Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git62100.00%6100.00%
Total62100.00%6100.00%


Overall Contributors

PersonTokensPropCommitsCommitProp
pre-gitpre-git27366.10%1142.31%
yoshihisa abeyoshihisa abe5112.35%13.85%
jan harkesjan harkes4410.65%311.54%
david howellsdavid howells122.91%27.69%
nick pigginnick piggin122.91%13.85%
eric w. biedermaneric w. biederman92.18%13.85%
al viroal viro61.45%311.54%
alexey dobriyanalexey dobriyan30.73%13.85%
fabian frederickfabian frederick10.24%13.85%
dave jonesdave jones10.24%13.85%
linus torvaldslinus torvalds10.24%13.85%
Total413100.00%26100.00%
Directory: fs/coda
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