b24413180f560 (Greg Kroah-Hartman 2017-11-01 15:07:57 +0100 1) // SPDX-License-Identifier: GPL-2.0
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 2) /*
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 3) * Cache operations for Coda.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 4) * For Linux 2.1: (C) 1997 Carnegie Mellon University
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 5) * For Linux 2.3: (C) 2000 Carnegie Mellon University
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 6) *
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 7) * Carnegie Mellon encourages users of this code to contribute improvements
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 8) * to the Coda project http://www.coda.cs.cmu.edu/ <coda@cs.cmu.edu>.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 9) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 10)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 11) #include <linux/types.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 12) #include <linux/kernel.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 13) #include <linux/time.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 14) #include <linux/fs.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 15) #include <linux/stat.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 16) #include <linux/errno.h>
834b46c37a290 (Fabian Frederick 2014-08-08 14:20:33 -0700 17) #include <linux/uaccess.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 18) #include <linux/string.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 19) #include <linux/list.h>
e8edc6e03a5c8 (Alexey Dobriyan 2007-05-21 01:22:52 +0400 20) #include <linux/sched.h>
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 21) #include <linux/spinlock.h>
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 22)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 23) #include <linux/coda.h>
8fc8b9df83138 (David Howells 2019-07-16 16:28:47 -0700 24) #include "coda_psdev.h"
31a203df9c109 (Al Viro 2011-01-12 16:36:09 -0500 25) #include "coda_linux.h"
31a203df9c109 (Al Viro 2011-01-12 16:36:09 -0500 26) #include "coda_cache.h"
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 27)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 28) static atomic_t permission_epoch = ATOMIC_INIT(0);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 29)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 30) /* replace or extend an acl cache hit */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 31) void coda_cache_enter(struct inode *inode, int mask)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 32) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 33) struct coda_inode_info *cii = ITOC(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 34)
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 35) spin_lock(&cii->c_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 36) cii->c_cached_epoch = atomic_read(&permission_epoch);
17499e332962e (Eric W. Biederman 2013-01-30 19:36:06 -0800 37) if (!uid_eq(cii->c_uid, current_fsuid())) {
97b7702cd1bdb (David Howells 2008-11-14 10:38:48 +1100 38) cii->c_uid = current_fsuid();
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 39) cii->c_cached_perm = mask;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 40) } else
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 41) cii->c_cached_perm |= mask;
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 42) spin_unlock(&cii->c_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 43) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 44)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 45) /* remove cached acl from an inode */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 46) void coda_cache_clear_inode(struct inode *inode)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 47) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 48) struct coda_inode_info *cii = ITOC(inode);
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 49) spin_lock(&cii->c_lock);
56ee3547940f8 (Jan Harkes 2007-07-19 01:48:42 -0700 50) cii->c_cached_epoch = atomic_read(&permission_epoch) - 1;
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 51) spin_unlock(&cii->c_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 52) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 53)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 54) /* remove all acl caches */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 55) void coda_cache_clear_all(struct super_block *sb)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 56) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 57) atomic_inc(&permission_epoch);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 58) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 59)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 60)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 61) /* check if the mask has been matched against the acl already */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 62) int coda_cache_check(struct inode *inode, int mask)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 63) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 64) struct coda_inode_info *cii = ITOC(inode);
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 65) int hit;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 66)
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 67) spin_lock(&cii->c_lock);
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 68) hit = (mask & cii->c_cached_perm) == mask &&
17499e332962e (Eric W. Biederman 2013-01-30 19:36:06 -0800 69) uid_eq(cii->c_uid, current_fsuid()) &&
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 70) cii->c_cached_epoch == atomic_read(&permission_epoch);
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 71) spin_unlock(&cii->c_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 72)
b5ce1d83a62fc (Yoshihisa Abe 2010-10-25 02:03:44 -0400 73) return hit;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 74) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 75)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 76)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 77) /* Purging dentries and children */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 78) /* The following routines drop dentries which are not
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 79) in use and flag dentries which are in use to be
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 80) zapped later.
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 81)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 82) The flags are detected by:
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 83) - coda_dentry_revalidate (for lookups) if the flag is C_PURGE
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 84) - coda_dentry_delete: to remove dentry from the cache when d_count
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 85) falls to zero
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 86) - an inode method coda_revalidate (for attributes) if the
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 87) flag is C_VATTR
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 88) */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 89)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 90) /* this won't do any harm: just flag all children */
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 91) static void coda_flag_children(struct dentry *parent, int flag)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 92) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 93) struct dentry *de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 94)
2fd6b7f50797f (Nicholas Piggin 2011-01-07 17:49:34 +1100 95) spin_lock(&parent->d_lock);
946e51f2bf37f (Al Viro 2014-10-26 19:19:16 -0400 96) list_for_each_entry(de, &parent->d_subdirs, d_child) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 97) /* don't know what to do with negative dentries */
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 98) if (d_inode(de) )
2b0143b5c986b (David Howells 2015-03-17 22:25:59 +0000 99) coda_flag_inode(d_inode(de), flag);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 100) }
2fd6b7f50797f (Nicholas Piggin 2011-01-07 17:49:34 +1100 101) spin_unlock(&parent->d_lock);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 102) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 103) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 104)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 105) void coda_flag_inode_children(struct inode *inode, int flag)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 106) {
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 107) struct dentry *alias_de;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 108)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 109) if ( !inode || !S_ISDIR(inode->i_mode))
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 110) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 111)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 112) alias_de = d_find_alias(inode);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 113) if (!alias_de)
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 114) return;
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 115) coda_flag_children(alias_de, flag);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 116) shrink_dcache_parent(alias_de);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 117) dput(alias_de);
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 118) }
^1da177e4c3f4 (Linus Torvalds 2005-04-16 15:20:36 -0700 119)
VisionFive2 Linux kernel
StarFive Tech Linux Kernel for VisionFive (JH7110) boards (mirror)
More than 9999 Commits
32 Branches
54 Tags