linux-imx
Public
Source
committed 6671726054536
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struct posix_acl *get_cached_acl(struct inode *inode, int type)38
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{39
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struct posix_acl **p = acl_by_type(inode, type);40
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struct posix_acl *acl;41
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for (;;) {43
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rcu_read_lock();44
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acl = rcu_dereference(*p);45
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if (!acl || is_uncached_acl(acl) ||46
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atomic_inc_not_zero(&acl->a_refcount))46
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refcount_inc_not_zero(&acl->a_refcount))47
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break;48
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rcu_read_unlock();49
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cpu_relax();50
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}51
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rcu_read_unlock();52
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return acl;53
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}54
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EXPORT_SYMBOL(get_cached_acl);55
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struct posix_acl *get_cached_acl_rcu(struct inode *inode, int type)157
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return acl;158
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}159
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EXPORT_SYMBOL(get_acl);160
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/*162
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* Init a fresh posix_acl163
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*/164
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void165
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posix_acl_init(struct posix_acl *acl, int count)166
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{167
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atomic_set(&acl->a_refcount, 1);167
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refcount_set(&acl->a_refcount, 1);168
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acl->a_count = count;169
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}170
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EXPORT_SYMBOL(posix_acl_init);171
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/*173
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* Allocate a new ACL with the specified number of entries.174
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*/175
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struct posix_acl *176
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posix_acl_alloc(int count, gfp_t flags)177
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{190
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static struct posix_acl *191
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posix_acl_clone(const struct posix_acl *acl, gfp_t flags)192
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{193
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struct posix_acl *clone = NULL;194
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if (acl) {196
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int size = sizeof(struct posix_acl) + acl->a_count *197
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sizeof(struct posix_acl_entry);198
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clone = kmemdup(acl, size, flags);199
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if (clone)200
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atomic_set(&clone->a_refcount, 1);200
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refcount_set(&clone->a_refcount, 1);201
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}202
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return clone;203
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}204
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/*206
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* Check if an acl is valid. Returns 0 if it is, or -E... otherwise.207
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*/208
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int209
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posix_acl_valid(struct user_namespace *user_ns, const struct posix_acl *acl)210
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{