4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
11 * linux/fs/minix/file.c
13 * Copyright (C) 1991, 1992 Linus Torvalds
15 * ext2 fs regular file handling primitives
17 * 64-bit file support on 64-bit platforms by Jakub Jelinek
18 * (jj@sunsite.ms.mff.cuni.cz)
21 #include <asm/uaccess.h>
22 #include <asm/system.h>
24 #include <linux/errno.h>
26 #include <linux/ext2_fs.h>
27 #include <linux/fcntl.h>
28 #include <linux/sched.h>
29 #include <linux/stat.h>
30 #include <linux/locks.h>
32 #include <linux/pagemap.h>
33 #include <linux/smp_lock.h>
35 #include <linux/obd_support.h>
36 #include <linux/obdfs.h>
38 static inline void remove_suid(struct inode *inode)
42 /* set S_IGID if S_IXGRP is set, and always set S_ISUID */
43 mode = (inode->i_mode & S_IXGRP)*(S_ISGID/S_IXGRP) | S_ISUID;
45 /* was any of the uid bits set? */
46 mode &= inode->i_mode;
47 if (mode && !capable(CAP_FSETID)) {
48 inode->i_mode &= ~mode;
49 mark_inode_dirty(inode);
54 * Write to a file (through the page cache).
57 obdfs_file_write(struct file *file, const char *buf, size_t count, loff_t *ppos)
60 CDEBUG(D_INODE, "Writing inode %ld, %d bytes, offset %ld\n", file->f_dentry->d_inode->i_ino, count, (long)*ppos);
62 retval = generic_file_write(file, buf, count,
63 ppos, obdfs_write_one_page);
64 CDEBUG(D_INODE, "Wrote %d\n", retval);
66 struct inode *inode = file->f_dentry->d_inode;
68 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
69 mark_inode_dirty(inode);
75 struct file_operations obdfs_file_operations = {
76 NULL, /* lseek - default */
77 generic_file_read, /* read */
78 obdfs_file_write, /* write */
79 NULL, /* readdir - bad */
80 NULL, /* poll - default */
83 NULL, /* no special open code */
85 NULL, /* no special release code */
88 NULL, /* check_media_change */
92 struct inode_operations obdfs_file_inode_operations = {
93 &obdfs_file_operations, /* default directory file-ops */
94 obdfs_create, /* create */
95 obdfs_lookup, /* lookup */
96 obdfs_link, /* link */
97 obdfs_unlink, /* unlink */
98 obdfs_symlink, /* symlink */
99 obdfs_mkdir, /* mkdir */
100 obdfs_rmdir, /* rmdir */
101 obdfs_mknod, /* mknod */
102 obdfs_rename, /* rename */
104 NULL, /* follow_link */
105 NULL, /* get_block */
106 obdfs_readpage, /* readpage */
107 obdfs_writepage, /* writepage */
109 NULL, /* permission */
110 NULL /* revalidate */