2006-05-13 08:18:27 +02:00
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/*
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* JFFS2 -- Journalling Flash File System, Version 2.
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2006-05-13 08:09:47 +02:00
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*
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2007-04-25 15:16:47 +02:00
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* Copyright © 2006 NEC Corporation
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2006-05-13 08:09:47 +02:00
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*
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2006-05-13 08:18:27 +02:00
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* Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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*/
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2007-04-25 15:16:47 +02:00
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2012-02-16 00:56:45 +01:00
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#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
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2006-05-13 08:09:47 +02:00
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#include <linux/kernel.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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2006-10-18 19:55:46 +02:00
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#include <linux/sched.h>
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2006-05-13 08:09:47 +02:00
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#include <linux/time.h>
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#include <linux/crc32.h>
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#include <linux/jffs2.h>
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#include <linux/xattr.h>
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#include <linux/posix_acl_xattr.h>
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#include <linux/mtd/mtd.h>
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#include "nodelist.h"
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static size_t jffs2_acl_size(int count)
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{
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if (count <= 4) {
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2006-05-13 08:13:27 +02:00
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return sizeof(struct jffs2_acl_header)
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+ count * sizeof(struct jffs2_acl_entry_short);
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2006-05-13 08:09:47 +02:00
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} else {
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2006-05-13 08:13:27 +02:00
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return sizeof(struct jffs2_acl_header)
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+ 4 * sizeof(struct jffs2_acl_entry_short)
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+ (count - 4) * sizeof(struct jffs2_acl_entry);
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2006-05-13 08:09:47 +02:00
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}
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}
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static int jffs2_acl_count(size_t size)
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{
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size_t s;
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2006-05-13 08:13:27 +02:00
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size -= sizeof(struct jffs2_acl_header);
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2009-03-04 21:01:41 +01:00
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if (size < 4 * sizeof(struct jffs2_acl_entry_short)) {
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2006-05-13 08:13:27 +02:00
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if (size % sizeof(struct jffs2_acl_entry_short))
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2006-05-13 08:09:47 +02:00
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return -1;
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2006-05-13 08:13:27 +02:00
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return size / sizeof(struct jffs2_acl_entry_short);
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2006-05-13 08:09:47 +02:00
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} else {
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2009-03-04 21:01:41 +01:00
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s = size - 4 * sizeof(struct jffs2_acl_entry_short);
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2006-05-13 08:13:27 +02:00
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if (s % sizeof(struct jffs2_acl_entry))
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2006-05-13 08:09:47 +02:00
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return -1;
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2006-05-13 08:13:27 +02:00
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return s / sizeof(struct jffs2_acl_entry) + 4;
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2006-05-13 08:09:47 +02:00
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}
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}
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2006-05-13 08:20:24 +02:00
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static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
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2006-05-13 08:09:47 +02:00
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{
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2006-05-13 08:20:24 +02:00
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void *end = value + size;
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struct jffs2_acl_header *header = value;
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struct jffs2_acl_entry *entry;
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2006-05-13 08:09:47 +02:00
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struct posix_acl *acl;
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uint32_t ver;
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int i, count;
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if (!value)
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return NULL;
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2006-05-13 08:13:27 +02:00
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if (size < sizeof(struct jffs2_acl_header))
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2006-05-13 08:09:47 +02:00
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return ERR_PTR(-EINVAL);
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2006-05-13 08:20:24 +02:00
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ver = je32_to_cpu(header->a_version);
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2006-05-13 08:09:47 +02:00
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if (ver != JFFS2_ACL_VERSION) {
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JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
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return ERR_PTR(-EINVAL);
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}
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2006-05-13 08:20:24 +02:00
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value += sizeof(struct jffs2_acl_header);
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2006-05-13 08:09:47 +02:00
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count = jffs2_acl_count(size);
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if (count < 0)
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return ERR_PTR(-EINVAL);
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if (count == 0)
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return NULL;
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acl = posix_acl_alloc(count, GFP_KERNEL);
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if (!acl)
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return ERR_PTR(-ENOMEM);
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for (i=0; i < count; i++) {
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2006-05-13 08:20:24 +02:00
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entry = value;
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if (value + sizeof(struct jffs2_acl_entry_short) > end)
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2006-05-13 08:09:47 +02:00
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goto fail;
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acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
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acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm);
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switch (acl->a_entries[i].e_tag) {
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_MASK:
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case ACL_OTHER:
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2006-05-13 08:20:24 +02:00
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value += sizeof(struct jffs2_acl_entry_short);
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2006-05-13 08:09:47 +02:00
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acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
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break;
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case ACL_USER:
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case ACL_GROUP:
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2006-05-13 08:20:24 +02:00
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value += sizeof(struct jffs2_acl_entry);
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if (value > end)
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2006-05-13 08:09:47 +02:00
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goto fail;
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acl->a_entries[i].e_id = je32_to_cpu(entry->e_id);
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break;
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default:
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goto fail;
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}
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}
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if (value != end)
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goto fail;
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return acl;
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fail:
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posix_acl_release(acl);
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return ERR_PTR(-EINVAL);
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}
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static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
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{
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2006-05-13 08:20:24 +02:00
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struct jffs2_acl_header *header;
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struct jffs2_acl_entry *entry;
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void *e;
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2006-05-13 08:09:47 +02:00
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size_t i;
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*size = jffs2_acl_size(acl->a_count);
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2006-05-13 08:20:24 +02:00
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header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL);
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if (!header)
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2006-05-13 08:09:47 +02:00
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return ERR_PTR(-ENOMEM);
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2006-05-13 08:20:24 +02:00
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header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
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e = header + 1;
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2006-05-13 08:09:47 +02:00
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for (i=0; i < acl->a_count; i++) {
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2006-05-13 08:20:24 +02:00
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entry = e;
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2006-05-13 08:09:47 +02:00
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entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag);
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entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm);
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switch(acl->a_entries[i].e_tag) {
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case ACL_USER:
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case ACL_GROUP:
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entry->e_id = cpu_to_je32(acl->a_entries[i].e_id);
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2006-05-13 08:13:27 +02:00
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e += sizeof(struct jffs2_acl_entry);
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2006-05-13 08:09:47 +02:00
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break;
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case ACL_USER_OBJ:
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case ACL_GROUP_OBJ:
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case ACL_MASK:
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case ACL_OTHER:
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2006-05-13 08:13:27 +02:00
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e += sizeof(struct jffs2_acl_entry_short);
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2006-05-13 08:09:47 +02:00
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break;
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default:
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goto fail;
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}
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}
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2006-05-13 08:20:24 +02:00
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return header;
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2006-05-13 08:09:47 +02:00
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fail:
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2006-05-13 08:20:24 +02:00
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kfree(header);
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2006-05-13 08:09:47 +02:00
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return ERR_PTR(-EINVAL);
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}
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2011-07-23 17:37:31 +02:00
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struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
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2006-05-13 08:09:47 +02:00
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{
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struct posix_acl *acl;
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char *value = NULL;
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int rc, xprefix;
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2009-06-09 18:11:54 +02:00
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acl = get_cached_acl(inode, type);
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if (acl != ACL_NOT_CACHED)
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return acl;
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2006-05-13 08:09:47 +02:00
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switch (type) {
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case ACL_TYPE_ACCESS:
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xprefix = JFFS2_XPREFIX_ACL_ACCESS;
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break;
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case ACL_TYPE_DEFAULT:
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xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
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break;
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default:
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2009-06-09 18:11:54 +02:00
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BUG();
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2006-05-13 08:09:47 +02:00
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}
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rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
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if (rc > 0) {
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value = kmalloc(rc, GFP_KERNEL);
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if (!value)
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return ERR_PTR(-ENOMEM);
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rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
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}
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if (rc > 0) {
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acl = jffs2_acl_from_medium(value, rc);
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} else if (rc == -ENODATA || rc == -ENOSYS) {
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acl = NULL;
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} else {
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acl = ERR_PTR(rc);
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}
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if (value)
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kfree(value);
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2009-06-09 18:11:54 +02:00
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if (!IS_ERR(acl))
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set_cached_acl(inode, type, acl);
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2006-05-13 08:09:47 +02:00
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return acl;
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}
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2007-09-14 08:16:35 +02:00
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static int __jffs2_set_acl(struct inode *inode, int xprefix, struct posix_acl *acl)
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{
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char *value = NULL;
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size_t size = 0;
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int rc;
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if (acl) {
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value = jffs2_acl_to_medium(acl, &size);
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if (IS_ERR(value))
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return PTR_ERR(value);
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}
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rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
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if (!value && rc == -ENODATA)
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rc = 0;
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kfree(value);
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return rc;
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}
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2006-05-13 08:09:47 +02:00
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static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
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{
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int rc, xprefix;
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if (S_ISLNK(inode->i_mode))
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return -EOPNOTSUPP;
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switch (type) {
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case ACL_TYPE_ACCESS:
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xprefix = JFFS2_XPREFIX_ACL_ACCESS;
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if (acl) {
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2011-07-24 00:56:36 +02:00
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umode_t mode = inode->i_mode;
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2006-05-13 08:09:47 +02:00
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rc = posix_acl_equiv_mode(acl, &mode);
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if (rc < 0)
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return rc;
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if (inode->i_mode != mode) {
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2007-08-22 13:39:19 +02:00
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struct iattr attr;
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2010-06-04 17:07:55 +02:00
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attr.ia_valid = ATTR_MODE | ATTR_CTIME;
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2007-08-22 13:39:19 +02:00
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attr.ia_mode = mode;
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2010-06-04 17:07:55 +02:00
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attr.ia_ctime = CURRENT_TIME_SEC;
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2007-08-22 13:39:19 +02:00
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rc = jffs2_do_setattr(inode, &attr);
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if (rc < 0)
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return rc;
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2006-05-13 08:09:47 +02:00
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}
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if (rc == 0)
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acl = NULL;
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}
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break;
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case ACL_TYPE_DEFAULT:
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xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
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if (!S_ISDIR(inode->i_mode))
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return acl ? -EACCES : 0;
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break;
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default:
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return -EINVAL;
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}
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2007-09-14 08:16:35 +02:00
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rc = __jffs2_set_acl(inode, xprefix, acl);
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2009-06-09 18:11:54 +02:00
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if (!rc)
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set_cached_acl(inode, type, acl);
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2006-05-13 08:09:47 +02:00
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return rc;
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}
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2011-07-24 00:37:50 +02:00
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int jffs2_init_acl_pre(struct inode *dir_i, struct inode *inode, umode_t *i_mode)
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2006-05-13 08:09:47 +02:00
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{
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2011-07-23 09:10:32 +02:00
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struct posix_acl *acl;
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2007-09-14 08:16:35 +02:00
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int rc;
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2006-05-13 08:09:47 +02:00
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2009-06-24 22:58:48 +02:00
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cache_no_acl(inode);
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2007-09-14 08:16:35 +02:00
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if (S_ISLNK(*i_mode))
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return 0; /* Symlink always has no-ACL */
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acl = jffs2_get_acl(dir_i, ACL_TYPE_DEFAULT);
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if (IS_ERR(acl))
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return PTR_ERR(acl);
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if (!acl) {
|
2009-03-30 01:08:22 +02:00
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*i_mode &= ~current_umask();
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2007-09-14 08:16:35 +02:00
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} else {
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if (S_ISDIR(*i_mode))
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2009-06-09 18:11:54 +02:00
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set_cached_acl(inode, ACL_TYPE_DEFAULT, acl);
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2007-08-22 13:39:19 +02:00
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2011-07-23 09:10:32 +02:00
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rc = posix_acl_create(&acl, GFP_KERNEL, i_mode);
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if (rc < 0)
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2007-09-14 08:16:35 +02:00
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return rc;
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if (rc > 0)
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2011-07-23 09:10:32 +02:00
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set_cached_acl(inode, ACL_TYPE_ACCESS, acl);
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2007-09-14 08:16:35 +02:00
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2011-07-23 09:10:32 +02:00
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posix_acl_release(acl);
|
2006-05-13 08:09:47 +02:00
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}
|
2007-09-14 08:16:35 +02:00
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return 0;
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}
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int jffs2_init_acl_post(struct inode *inode)
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{
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int rc;
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2009-06-09 01:55:12 +02:00
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if (inode->i_default_acl) {
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rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_DEFAULT, inode->i_default_acl);
|
2007-09-14 08:16:35 +02:00
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if (rc)
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return rc;
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}
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|
2009-06-09 01:55:12 +02:00
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if (inode->i_acl) {
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|
|
rc = __jffs2_set_acl(inode, JFFS2_XPREFIX_ACL_ACCESS, inode->i_acl);
|
2007-09-14 08:16:35 +02:00
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2007-10-27 16:36:44 +02:00
|
|
|
return 0;
|
2006-05-13 08:09:47 +02:00
|
|
|
}
|
|
|
|
|
|
|
|
int jffs2_acl_chmod(struct inode *inode)
|
|
|
|
{
|
2011-07-23 06:18:02 +02:00
|
|
|
struct posix_acl *acl;
|
2006-05-13 08:09:47 +02:00
|
|
|
int rc;
|
|
|
|
|
|
|
|
if (S_ISLNK(inode->i_mode))
|
|
|
|
return -EOPNOTSUPP;
|
|
|
|
acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS);
|
|
|
|
if (IS_ERR(acl) || !acl)
|
|
|
|
return PTR_ERR(acl);
|
2011-07-23 06:18:02 +02:00
|
|
|
rc = posix_acl_chmod(&acl, GFP_KERNEL, inode->i_mode);
|
|
|
|
if (rc)
|
|
|
|
return rc;
|
|
|
|
rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, acl);
|
2006-05-13 08:09:47 +02:00
|
|
|
posix_acl_release(acl);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2009-11-13 10:52:56 +01:00
|
|
|
static size_t jffs2_acl_access_listxattr(struct dentry *dentry, char *list,
|
|
|
|
size_t list_size, const char *name, size_t name_len, int type)
|
2006-05-13 08:09:47 +02:00
|
|
|
{
|
|
|
|
const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS);
|
|
|
|
|
|
|
|
if (list && retlen <= list_size)
|
|
|
|
strcpy(list, POSIX_ACL_XATTR_ACCESS);
|
|
|
|
return retlen;
|
|
|
|
}
|
|
|
|
|
2009-11-13 10:52:56 +01:00
|
|
|
static size_t jffs2_acl_default_listxattr(struct dentry *dentry, char *list,
|
|
|
|
size_t list_size, const char *name, size_t name_len, int type)
|
2006-05-13 08:09:47 +02:00
|
|
|
{
|
|
|
|
const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT);
|
|
|
|
|
|
|
|
if (list && retlen <= list_size)
|
|
|
|
strcpy(list, POSIX_ACL_XATTR_DEFAULT);
|
|
|
|
return retlen;
|
|
|
|
}
|
|
|
|
|
2009-11-13 10:52:56 +01:00
|
|
|
static int jffs2_acl_getxattr(struct dentry *dentry, const char *name,
|
|
|
|
void *buffer, size_t size, int type)
|
2006-05-13 08:09:47 +02:00
|
|
|
{
|
|
|
|
struct posix_acl *acl;
|
|
|
|
int rc;
|
|
|
|
|
2009-11-13 10:52:56 +01:00
|
|
|
if (name[0] != '\0')
|
|
|
|
return -EINVAL;
|
|
|
|
|
|
|
|
acl = jffs2_get_acl(dentry->d_inode, type);
|
2006-05-13 08:09:47 +02:00
|
|
|
if (IS_ERR(acl))
|
|
|
|
return PTR_ERR(acl);
|
|
|
|
if (!acl)
|
|
|
|
return -ENODATA;
|
2012-09-11 05:17:44 +02:00
|
|
|
rc = posix_acl_to_xattr(&init_user_ns, acl, buffer, size);
|
2006-05-13 08:09:47 +02:00
|
|
|
posix_acl_release(acl);
|
|
|
|
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2009-11-13 10:52:56 +01:00
|
|
|
static int jffs2_acl_setxattr(struct dentry *dentry, const char *name,
|
|
|
|
const void *value, size_t size, int flags, int type)
|
2006-05-13 08:09:47 +02:00
|
|
|
{
|
|
|
|
struct posix_acl *acl;
|
|
|
|
int rc;
|
|
|
|
|
2009-11-13 10:52:56 +01:00
|
|
|
if (name[0] != '\0')
|
|
|
|
return -EINVAL;
|
2011-03-24 00:43:26 +01:00
|
|
|
if (!inode_owner_or_capable(dentry->d_inode))
|
2006-05-13 08:09:47 +02:00
|
|
|
return -EPERM;
|
|
|
|
|
|
|
|
if (value) {
|
2012-09-11 05:17:44 +02:00
|
|
|
acl = posix_acl_from_xattr(&init_user_ns, value, size);
|
2006-05-13 08:09:47 +02:00
|
|
|
if (IS_ERR(acl))
|
|
|
|
return PTR_ERR(acl);
|
|
|
|
if (acl) {
|
|
|
|
rc = posix_acl_valid(acl);
|
|
|
|
if (rc)
|
|
|
|
goto out;
|
|
|
|
}
|
|
|
|
} else {
|
|
|
|
acl = NULL;
|
|
|
|
}
|
2009-11-13 10:52:56 +01:00
|
|
|
rc = jffs2_set_acl(dentry->d_inode, type, acl);
|
2006-05-13 08:09:47 +02:00
|
|
|
out:
|
|
|
|
posix_acl_release(acl);
|
|
|
|
return rc;
|
|
|
|
}
|
|
|
|
|
2010-05-14 02:53:21 +02:00
|
|
|
const struct xattr_handler jffs2_acl_access_xattr_handler = {
|
2006-05-13 08:09:47 +02:00
|
|
|
.prefix = POSIX_ACL_XATTR_ACCESS,
|
2009-11-13 10:52:56 +01:00
|
|
|
.flags = ACL_TYPE_DEFAULT,
|
2006-05-13 08:09:47 +02:00
|
|
|
.list = jffs2_acl_access_listxattr,
|
2009-11-13 10:52:56 +01:00
|
|
|
.get = jffs2_acl_getxattr,
|
|
|
|
.set = jffs2_acl_setxattr,
|
2006-05-13 08:09:47 +02:00
|
|
|
};
|
|
|
|
|
2010-05-14 02:53:21 +02:00
|
|
|
const struct xattr_handler jffs2_acl_default_xattr_handler = {
|
2006-05-13 08:09:47 +02:00
|
|
|
.prefix = POSIX_ACL_XATTR_DEFAULT,
|
2009-11-13 10:52:56 +01:00
|
|
|
.flags = ACL_TYPE_DEFAULT,
|
2006-05-13 08:09:47 +02:00
|
|
|
.list = jffs2_acl_default_listxattr,
|
2009-11-13 10:52:56 +01:00
|
|
|
.get = jffs2_acl_getxattr,
|
|
|
|
.set = jffs2_acl_setxattr,
|
2006-05-13 08:09:47 +02:00
|
|
|
};
|