Root/fs/stack.c

1#include <linux/module.h>
2#include <linux/fs.h>
3#include <linux/fs_stack.h>
4
5/* does _NOT_ require i_mutex to be held.
6 *
7 * This function cannot be inlined since i_size_{read,write} is rather
8 * heavy-weight on 32-bit systems
9 */
10void fsstack_copy_inode_size(struct inode *dst, const struct inode *src)
11{
12    i_size_write(dst, i_size_read((struct inode *)src));
13    dst->i_blocks = src->i_blocks;
14}
15EXPORT_SYMBOL_GPL(fsstack_copy_inode_size);
16
17/* copy all attributes; get_nlinks is optional way to override the i_nlink
18 * copying
19 */
20void fsstack_copy_attr_all(struct inode *dest, const struct inode *src,
21                int (*get_nlinks)(struct inode *))
22{
23    dest->i_mode = src->i_mode;
24    dest->i_uid = src->i_uid;
25    dest->i_gid = src->i_gid;
26    dest->i_rdev = src->i_rdev;
27    dest->i_atime = src->i_atime;
28    dest->i_mtime = src->i_mtime;
29    dest->i_ctime = src->i_ctime;
30    dest->i_blkbits = src->i_blkbits;
31    dest->i_flags = src->i_flags;
32
33    /*
34     * Update the nlinks AFTER updating the above fields, because the
35     * get_links callback may depend on them.
36     */
37    if (!get_nlinks)
38        dest->i_nlink = src->i_nlink;
39    else
40        dest->i_nlink = (*get_nlinks)(dest);
41}
42EXPORT_SYMBOL_GPL(fsstack_copy_attr_all);
43

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