Merge branch 'master' of /home/trondmy/kernel/linux-2.6/

Conflicts:

	include/linux/nfs_fs.h

Fixed up conflict with kernel header updates.

1 files changed, 485 insertions, 0 deletions

diff --git a/fs/jffs2/acl.c b/fs/jffs2/acl.c
new file mode 100644
index 000000000000..320dd48b834e
--- /dev/null
+++ b/fs/jffs2/acl.c
@@ -0,0 +1,485 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2006  NEC Corporation
+ *
+ * Created by KaiGai Kohei <kaigai@ak.jp.nec.com>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/time.h>
+#include <linux/crc32.h>
+#include <linux/jffs2.h>
+#include <linux/xattr.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/mtd/mtd.h>
+#include "nodelist.h"
+
+static size_t jffs2_acl_size(int count)
+{
+        if (count <= 4) {
+                return sizeof(struct jffs2_acl_header)
+                       + count * sizeof(struct jffs2_acl_entry_short);
+        } else {
+                return sizeof(struct jffs2_acl_header)
+                       + 4 * sizeof(struct jffs2_acl_entry_short)
+                       + (count - 4) * sizeof(struct jffs2_acl_entry);
+        }
+}
+
+static int jffs2_acl_count(size_t size)
+{
+        size_t s;
+
+        size -= sizeof(struct jffs2_acl_header);
+        s = size - 4 * sizeof(struct jffs2_acl_entry_short);
+        if (s < 0) {
+                if (size % sizeof(struct jffs2_acl_entry_short))
+                        return -1;
+                return size / sizeof(struct jffs2_acl_entry_short);
+        } else {
+                if (s % sizeof(struct jffs2_acl_entry))
+                        return -1;
+                return s / sizeof(struct jffs2_acl_entry) + 4;
+        }
+}
+
+static struct posix_acl *jffs2_acl_from_medium(void *value, size_t size)
+{
+        void *end = value + size;
+        struct jffs2_acl_header *header = value;
+        struct jffs2_acl_entry *entry;
+        struct posix_acl *acl;
+        uint32_t ver;
+        int i, count;
+
+        if (!value)
+                return NULL;
+        if (size < sizeof(struct jffs2_acl_header))
+                return ERR_PTR(-EINVAL);
+        ver = je32_to_cpu(header->a_version);
+        if (ver != JFFS2_ACL_VERSION) {
+                JFFS2_WARNING("Invalid ACL version. (=%u)\n", ver);
+                return ERR_PTR(-EINVAL);
+        }
+
+        value += sizeof(struct jffs2_acl_header);
+        count = jffs2_acl_count(size);
+        if (count < 0)
+                return ERR_PTR(-EINVAL);
+        if (count == 0)
+                return NULL;
+
+        acl = posix_acl_alloc(count, GFP_KERNEL);
+        if (!acl)
+                return ERR_PTR(-ENOMEM);
+
+        for (i=0; i < count; i++) {
+                entry = value;
+                if (value + sizeof(struct jffs2_acl_entry_short) > end)
+                        goto fail;
+                acl->a_entries[i].e_tag = je16_to_cpu(entry->e_tag);
+                acl->a_entries[i].e_perm = je16_to_cpu(entry->e_perm);
+                switch (acl->a_entries[i].e_tag) {
+                        case ACL_USER_OBJ:
+                        case ACL_GROUP_OBJ:
+                        case ACL_MASK:
+                        case ACL_OTHER:
+                                value += sizeof(struct jffs2_acl_entry_short);
+                                acl->a_entries[i].e_id = ACL_UNDEFINED_ID;
+                                break;
+
+                        case ACL_USER:
+                        case ACL_GROUP:
+                                value += sizeof(struct jffs2_acl_entry);
+                                if (value > end)
+                                        goto fail;
+                                acl->a_entries[i].e_id = je32_to_cpu(entry->e_id);
+                                break;
+
+                        default:
+                                goto fail;
+                }
+        }
+        if (value != end)
+                goto fail;
+        return acl;
+ fail:
+        posix_acl_release(acl);
+        return ERR_PTR(-EINVAL);
+}
+
+static void *jffs2_acl_to_medium(const struct posix_acl *acl, size_t *size)
+{
+        struct jffs2_acl_header *header;
+        struct jffs2_acl_entry *entry;
+        void *e;
+        size_t i;
+
+        *size = jffs2_acl_size(acl->a_count);
+        header = kmalloc(sizeof(*header) + acl->a_count * sizeof(*entry), GFP_KERNEL);
+        if (!header)
+                return ERR_PTR(-ENOMEM);
+        header->a_version = cpu_to_je32(JFFS2_ACL_VERSION);
+        e = header + 1;
+        for (i=0; i < acl->a_count; i++) {
+                entry = e;
+                entry->e_tag = cpu_to_je16(acl->a_entries[i].e_tag);
+                entry->e_perm = cpu_to_je16(acl->a_entries[i].e_perm);
+                switch(acl->a_entries[i].e_tag) {
+                        case ACL_USER:
+                        case ACL_GROUP:
+                                entry->e_id = cpu_to_je32(acl->a_entries[i].e_id);
+                                e += sizeof(struct jffs2_acl_entry);
+                                break;
+
+                        case ACL_USER_OBJ:
+                        case ACL_GROUP_OBJ:
+                        case ACL_MASK:
+                        case ACL_OTHER:
+                                e += sizeof(struct jffs2_acl_entry_short);
+                                break;
+
+                        default:
+                                goto fail;
+                }
+        }
+        return header;
+ fail:
+        kfree(header);
+        return ERR_PTR(-EINVAL);
+}
+
+static struct posix_acl *jffs2_iget_acl(struct inode *inode, struct posix_acl **i_acl)
+{
+        struct posix_acl *acl = JFFS2_ACL_NOT_CACHED;
+
+        spin_lock(&inode->i_lock);
+        if (*i_acl != JFFS2_ACL_NOT_CACHED)
+                acl = posix_acl_dup(*i_acl);
+        spin_unlock(&inode->i_lock);
+        return acl;
+}
+
+static void jffs2_iset_acl(struct inode *inode, struct posix_acl **i_acl, struct posix_acl *acl)
+{
+        spin_lock(&inode->i_lock);
+        if (*i_acl != JFFS2_ACL_NOT_CACHED)
+                posix_acl_release(*i_acl);
+        *i_acl = posix_acl_dup(acl);
+        spin_unlock(&inode->i_lock);
+}
+
+static struct posix_acl *jffs2_get_acl(struct inode *inode, int type)
+{
+        struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+        struct posix_acl *acl;
+        char *value = NULL;
+        int rc, xprefix;
+
+        switch (type) {
+        case ACL_TYPE_ACCESS:
+                acl = jffs2_iget_acl(inode, &f->i_acl_access);
+                if (acl != JFFS2_ACL_NOT_CACHED)
+                        return acl;
+                xprefix = JFFS2_XPREFIX_ACL_ACCESS;
+                break;
+        case ACL_TYPE_DEFAULT:
+                acl = jffs2_iget_acl(inode, &f->i_acl_default);
+                if (acl != JFFS2_ACL_NOT_CACHED)
+                        return acl;
+                xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
+                break;
+        default:
+                return ERR_PTR(-EINVAL);
+        }
+        rc = do_jffs2_getxattr(inode, xprefix, "", NULL, 0);
+        if (rc > 0) {
+                value = kmalloc(rc, GFP_KERNEL);
+                if (!value)
+                        return ERR_PTR(-ENOMEM);
+                rc = do_jffs2_getxattr(inode, xprefix, "", value, rc);
+        }
+        if (rc > 0) {
+                acl = jffs2_acl_from_medium(value, rc);
+        } else if (rc == -ENODATA || rc == -ENOSYS) {
+                acl = NULL;
+        } else {
+                acl = ERR_PTR(rc);
+        }
+        if (value)
+                kfree(value);
+        if (!IS_ERR(acl)) {
+                switch (type) {
+                case ACL_TYPE_ACCESS:
+                        jffs2_iset_acl(inode, &f->i_acl_access, acl);
+                        break;
+                case ACL_TYPE_DEFAULT:
+                        jffs2_iset_acl(inode, &f->i_acl_default, acl);
+                        break;
+                }
+        }
+        return acl;
+}
+
+static int jffs2_set_acl(struct inode *inode, int type, struct posix_acl *acl)
+{
+        struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+        size_t size = 0;
+        char *value = NULL;
+        int rc, xprefix;
+
+        if (S_ISLNK(inode->i_mode))
+                return -EOPNOTSUPP;
+
+        switch (type) {
+        case ACL_TYPE_ACCESS:
+                xprefix = JFFS2_XPREFIX_ACL_ACCESS;
+                if (acl) {
+                        mode_t mode = inode->i_mode;
+                        rc = posix_acl_equiv_mode(acl, &mode);
+                        if (rc < 0)
+                                return rc;
+                        if (inode->i_mode != mode) {
+                                inode->i_mode = mode;
+                                jffs2_dirty_inode(inode);
+                        }
+                        if (rc == 0)
+                                acl = NULL;
+                }
+                break;
+        case ACL_TYPE_DEFAULT:
+                xprefix = JFFS2_XPREFIX_ACL_DEFAULT;
+                if (!S_ISDIR(inode->i_mode))
+                        return acl ? -EACCES : 0;
+                break;
+        default:
+                return -EINVAL;
+        }
+        if (acl) {
+                value = jffs2_acl_to_medium(acl, &size);
+                if (IS_ERR(value))
+                        return PTR_ERR(value);
+        }
+
+        rc = do_jffs2_setxattr(inode, xprefix, "", value, size, 0);
+        if (value)
+                kfree(value);
+        if (!rc) {
+                switch(type) {
+                case ACL_TYPE_ACCESS:
+                        jffs2_iset_acl(inode, &f->i_acl_access, acl);
+                        break;
+                case ACL_TYPE_DEFAULT:
+                        jffs2_iset_acl(inode, &f->i_acl_default, acl);
+                        break;
+                }
+        }
+        return rc;
+}
+
+static int jffs2_check_acl(struct inode *inode, int mask)
+{
+        struct posix_acl *acl;
+        int rc;
+
+        acl = jffs2_get_acl(inode, ACL_TYPE_ACCESS);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        if (acl) {
+                rc = posix_acl_permission(inode, acl, mask);
+                posix_acl_release(acl);
+                return rc;
+        }
+        return -EAGAIN;
+}
+
+int jffs2_permission(struct inode *inode, int mask, struct nameidata *nd)
+{
+        return generic_permission(inode, mask, jffs2_check_acl);
+}
+
+int jffs2_init_acl(struct inode *inode, struct inode *dir)
+{
+        struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+        struct posix_acl *acl = NULL, *clone;
+        mode_t mode;
+        int rc = 0;
+
+        f->i_acl_access = JFFS2_ACL_NOT_CACHED;
+        f->i_acl_default = JFFS2_ACL_NOT_CACHED;
+        if (!S_ISLNK(inode->i_mode)) {
+                acl = jffs2_get_acl(dir, ACL_TYPE_DEFAULT);
+                if (IS_ERR(acl))
+                        return PTR_ERR(acl);
+                if (!acl)
+                        inode->i_mode &= ~current->fs->umask;
+        }
+        if (acl) {
+                if (S_ISDIR(inode->i_mode)) {
+                        rc = jffs2_set_acl(inode, ACL_TYPE_DEFAULT, acl);
+                        if (rc)
+                                goto cleanup;
+                }
+                clone = posix_acl_clone(acl, GFP_KERNEL);
+                rc = -ENOMEM;
+                if (!clone)
+                        goto cleanup;
+                mode = inode->i_mode;
+                rc = posix_acl_create_masq(clone, &mode);
+                if (rc >= 0) {
+                        inode->i_mode = mode;
+                        if (rc > 0)
+                                rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone);
+                }
+                posix_acl_release(clone);
+        }
+ cleanup:
+        posix_acl_release(acl);
+        return rc;
+}
+
+void jffs2_clear_acl(struct inode *inode)
+{
+        struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+
+        if (f->i_acl_access && f->i_acl_access != JFFS2_ACL_NOT_CACHED) {
+                posix_acl_release(f->i_acl_access);
+                f->i_acl_access = JFFS2_ACL_NOT_CACHED;
+        }
+        if (f->i_acl_default && f->i_acl_default != JFFS2_ACL_NOT_CACHED) {
+                posix_acl_release(f->i_acl_default);
+                f->i_acl_default = JFFS2_ACL_NOT_CACHED;
+        }
+}
+
+int jffs2_acl_chmod(struct inode *inode)
+{
+        struct posix_acl *acl, *clone;
+        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);
+        clone = posix_acl_clone(acl, GFP_KERNEL);
+        posix_acl_release(acl);
+        if (!clone)
+                return -ENOMEM;
+        rc = posix_acl_chmod_masq(clone, inode->i_mode);
+        if (!rc)
+                rc = jffs2_set_acl(inode, ACL_TYPE_ACCESS, clone);
+        posix_acl_release(clone);
+        return rc;
+}
+
+static size_t jffs2_acl_access_listxattr(struct inode *inode, char *list, size_t list_size,
+                                         const char *name, size_t name_len)
+{
+        const int retlen = sizeof(POSIX_ACL_XATTR_ACCESS);
+
+        if (list && retlen <= list_size)
+                strcpy(list, POSIX_ACL_XATTR_ACCESS);
+        return retlen;
+}
+
+static size_t jffs2_acl_default_listxattr(struct inode *inode, char *list, size_t list_size,
+                                          const char *name, size_t name_len)
+{
+        const int retlen = sizeof(POSIX_ACL_XATTR_DEFAULT);
+
+        if (list && retlen <= list_size)
+                strcpy(list, POSIX_ACL_XATTR_DEFAULT);
+        return retlen;
+}
+
+static int jffs2_acl_getxattr(struct inode *inode, int type, void *buffer, size_t size)
+{
+        struct posix_acl *acl;
+        int rc;
+
+        acl = jffs2_get_acl(inode, type);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        if (!acl)
+                return -ENODATA;
+        rc = posix_acl_to_xattr(acl, buffer, size);
+        posix_acl_release(acl);
+
+        return rc;
+}
+
+static int jffs2_acl_access_getxattr(struct inode *inode, const char *name, void *buffer, size_t size)
+{
+        if (name[0] != '\0')
+                return -EINVAL;
+        return jffs2_acl_getxattr(inode, ACL_TYPE_ACCESS, buffer, size);
+}
+
+static int jffs2_acl_default_getxattr(struct inode *inode, const char *name, void *buffer, size_t size)
+{
+        if (name[0] != '\0')
+                return -EINVAL;
+        return jffs2_acl_getxattr(inode, ACL_TYPE_DEFAULT, buffer, size);
+}
+
+static int jffs2_acl_setxattr(struct inode *inode, int type, const void *value, size_t size)
+{
+        struct posix_acl *acl;
+        int rc;
+
+        if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+                return -EPERM;
+
+        if (value) {
+                acl = posix_acl_from_xattr(value, size);
+                if (IS_ERR(acl))
+                        return PTR_ERR(acl);
+                if (acl) {
+                        rc = posix_acl_valid(acl);
+                        if (rc)
+                                goto out;
+                }
+        } else {
+                acl = NULL;
+        }
+        rc = jffs2_set_acl(inode, type, acl);
+ out:
+        posix_acl_release(acl);
+        return rc;
+}
+
+static int jffs2_acl_access_setxattr(struct inode *inode, const char *name,
+                                     const void *buffer, size_t size, int flags)
+{
+        if (name[0] != '\0')
+                return -EINVAL;
+        return jffs2_acl_setxattr(inode, ACL_TYPE_ACCESS, buffer, size);
+}
+
+static int jffs2_acl_default_setxattr(struct inode *inode, const char *name,
+                                      const void *buffer, size_t size, int flags)
+{
+        if (name[0] != '\0')
+                return -EINVAL;
+        return jffs2_acl_setxattr(inode, ACL_TYPE_DEFAULT, buffer, size);
+}
+
+struct xattr_handler jffs2_acl_access_xattr_handler = {
+        .prefix = POSIX_ACL_XATTR_ACCESS,
+        .list   = jffs2_acl_access_listxattr,
+        .get    = jffs2_acl_access_getxattr,
+        .set    = jffs2_acl_access_setxattr,
+};
+
+struct xattr_handler jffs2_acl_default_xattr_handler = {
+        .prefix = POSIX_ACL_XATTR_DEFAULT,
+        .list   = jffs2_acl_default_listxattr,
+        .get    = jffs2_acl_default_getxattr,
+        .set    = jffs2_acl_default_setxattr,
+};