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98e9cb5711
Add an additional "name" field to struct xattr_handler. When the name
is set, the handler matches attributes with exactly that name. When the
prefix is set instead, the handler matches attributes with the given
prefix and with a non-empty suffix.
This patch should avoid bugs like the one fixed in commit c361016a in
the future.
Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
Reviewed-by: James Morris <james.l.morris@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
61 lines
1.6 KiB
C
61 lines
1.6 KiB
C
/*
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* linux/fs/ext2/xattr_user.c
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* Handler for extended user attributes.
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*
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* Copyright (C) 2001 by Andreas Gruenbacher, <a.gruenbacher@computer.org>
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*/
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#include <linux/init.h>
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#include <linux/string.h>
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#include "ext2.h"
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#include "xattr.h"
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static size_t
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ext2_xattr_user_list(const struct xattr_handler *handler,
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struct dentry *dentry, char *list, size_t list_size,
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const char *name, size_t name_len)
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{
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const size_t prefix_len = XATTR_USER_PREFIX_LEN;
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const size_t total_len = prefix_len + name_len + 1;
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if (!test_opt(dentry->d_sb, XATTR_USER))
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return 0;
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if (list && total_len <= list_size) {
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memcpy(list, XATTR_USER_PREFIX, prefix_len);
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memcpy(list+prefix_len, name, name_len);
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list[prefix_len + name_len] = '\0';
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}
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return total_len;
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}
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static int
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ext2_xattr_user_get(const struct xattr_handler *handler,
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struct dentry *dentry, const char *name,
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void *buffer, size_t size)
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{
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if (!test_opt(dentry->d_sb, XATTR_USER))
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return -EOPNOTSUPP;
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return ext2_xattr_get(d_inode(dentry), EXT2_XATTR_INDEX_USER,
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name, buffer, size);
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}
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static int
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ext2_xattr_user_set(const struct xattr_handler *handler,
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struct dentry *dentry, const char *name,
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const void *value, size_t size, int flags)
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{
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if (!test_opt(dentry->d_sb, XATTR_USER))
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return -EOPNOTSUPP;
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return ext2_xattr_set(d_inode(dentry), EXT2_XATTR_INDEX_USER,
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name, value, size, flags);
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}
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const struct xattr_handler ext2_xattr_user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.list = ext2_xattr_user_list,
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.get = ext2_xattr_user_get,
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.set = ext2_xattr_user_set,
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};
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