1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
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* linux/fs/ext3/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/module.h>
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#include <linux/string.h>
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#include <linux/fs.h>
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#include <linux/smp_lock.h>
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#include <linux/ext3_jbd.h>
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#include <linux/ext3_fs.h>
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#include "xattr.h"
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#define XATTR_USER_PREFIX "user."
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static size_t
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ext3_xattr_user_list(struct inode *inode, 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 = sizeof(XATTR_USER_PREFIX)-1;
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const size_t total_len = prefix_len + name_len + 1;
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if (!test_opt(inode->i_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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ext3_xattr_user_get(struct inode *inode, const char *name,
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void *buffer, size_t size)
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{
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int error;
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if (strcmp(name, "") == 0)
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return -EINVAL;
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if (!test_opt(inode->i_sb, XATTR_USER))
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return -EOPNOTSUPP;
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error = permission(inode, MAY_READ, NULL);
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if (error)
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return error;
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return ext3_xattr_get(inode, EXT3_XATTR_INDEX_USER, name, buffer, size);
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}
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static int
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ext3_xattr_user_set(struct inode *inode, const char *name,
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const void *value, size_t size, int flags)
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{
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int error;
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if (strcmp(name, "") == 0)
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return -EINVAL;
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if (!test_opt(inode->i_sb, XATTR_USER))
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return -EOPNOTSUPP;
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if ( !S_ISREG(inode->i_mode) &&
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(!S_ISDIR(inode->i_mode) || inode->i_mode & S_ISVTX))
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return -EPERM;
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error = permission(inode, MAY_WRITE, NULL);
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if (error)
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return error;
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return ext3_xattr_set(inode, EXT3_XATTR_INDEX_USER, name,
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value, size, flags);
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}
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struct xattr_handler ext3_xattr_user_handler = {
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.prefix = XATTR_USER_PREFIX,
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.list = ext3_xattr_user_list,
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.get = ext3_xattr_user_get,
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.set = ext3_xattr_user_set,
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};
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