1 |
1275 |
phoenix |
/*
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2 |
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* linux/fs/affs/inode.c
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3 |
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*
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4 |
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* (c) 1996 Hans-Joachim Widmaier - Rewritten
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5 |
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*
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6 |
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* (C) 1993 Ray Burr - Modified for Amiga FFS filesystem.
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7 |
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*
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8 |
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* (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
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9 |
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*
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10 |
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* (C) 1991 Linus Torvalds - minix filesystem
|
11 |
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*/
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12 |
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13 |
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#include <linux/module.h>
|
14 |
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#include <linux/errno.h>
|
15 |
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#include <linux/fs.h>
|
16 |
|
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#include <linux/slab.h>
|
17 |
|
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#include <linux/stat.h>
|
18 |
|
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#include <linux/sched.h>
|
19 |
|
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#include <linux/affs_fs.h>
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20 |
|
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#include <linux/kernel.h>
|
21 |
|
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#include <linux/mm.h>
|
22 |
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#include <linux/string.h>
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23 |
|
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#include <linux/locks.h>
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24 |
|
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#include <linux/genhd.h>
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25 |
|
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#include <linux/amigaffs.h>
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26 |
|
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#include <linux/major.h>
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27 |
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#include <linux/blkdev.h>
|
28 |
|
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#include <linux/init.h>
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29 |
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#include <asm/system.h>
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30 |
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#include <asm/uaccess.h>
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31 |
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|
32 |
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extern int *blk_size[];
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33 |
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extern struct timezone sys_tz;
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34 |
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|
35 |
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static int affs_statfs(struct super_block *sb, struct statfs *buf);
|
36 |
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static int affs_remount (struct super_block *sb, int *flags, char *data);
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37 |
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|
38 |
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static void
|
39 |
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affs_put_super(struct super_block *sb)
|
40 |
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{
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41 |
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pr_debug("AFFS: put_super()\n");
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42 |
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|
43 |
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if (!(sb->s_flags & MS_RDONLY)) {
|
44 |
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AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->bm_flag = be32_to_cpu(1);
|
45 |
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secs_to_datestamp(CURRENT_TIME,
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46 |
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&AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->disk_change);
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47 |
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affs_fix_checksum(sb, AFFS_SB->s_root_bh);
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48 |
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mark_buffer_dirty(AFFS_SB->s_root_bh);
|
49 |
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}
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50 |
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|
51 |
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affs_brelse(AFFS_SB->s_bmap_bh);
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52 |
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if (AFFS_SB->s_prefix)
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53 |
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kfree(AFFS_SB->s_prefix);
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54 |
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kfree(AFFS_SB->s_bitmap);
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55 |
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affs_brelse(AFFS_SB->s_root_bh);
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56 |
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|
57 |
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return;
|
58 |
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}
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59 |
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60 |
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static void
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61 |
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affs_write_super(struct super_block *sb)
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62 |
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{
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63 |
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int clean = 2;
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64 |
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|
65 |
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if (!(sb->s_flags & MS_RDONLY)) {
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66 |
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// if (AFFS_SB->s_bitmap[i].bm_bh) {
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67 |
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// if (buffer_dirty(AFFS_SB->s_bitmap[i].bm_bh)) {
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68 |
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// clean = 0;
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69 |
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AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->bm_flag = be32_to_cpu(clean);
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70 |
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secs_to_datestamp(CURRENT_TIME,
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71 |
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&AFFS_ROOT_TAIL(sb, AFFS_SB->s_root_bh)->disk_change);
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72 |
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affs_fix_checksum(sb, AFFS_SB->s_root_bh);
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73 |
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mark_buffer_dirty(AFFS_SB->s_root_bh);
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74 |
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sb->s_dirt = !clean; /* redo until bitmap synced */
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75 |
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} else
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76 |
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sb->s_dirt = 0;
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77 |
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|
78 |
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pr_debug("AFFS: write_super() at %lu, clean=%d\n", CURRENT_TIME, clean);
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79 |
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}
|
80 |
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|
81 |
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static struct super_operations affs_sops = {
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82 |
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read_inode: affs_read_inode,
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83 |
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write_inode: affs_write_inode,
|
84 |
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put_inode: affs_put_inode,
|
85 |
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delete_inode: affs_delete_inode,
|
86 |
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clear_inode: affs_clear_inode,
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87 |
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put_super: affs_put_super,
|
88 |
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write_super: affs_write_super,
|
89 |
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statfs: affs_statfs,
|
90 |
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remount_fs: affs_remount,
|
91 |
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};
|
92 |
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|
93 |
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static int
|
94 |
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parse_options(char *options, uid_t *uid, gid_t *gid, int *mode, int *reserved, s32 *root,
|
95 |
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int *blocksize, char **prefix, char *volume, unsigned long *mount_opts)
|
96 |
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{
|
97 |
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char *this_char, *value, *optn;
|
98 |
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int f;
|
99 |
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|
100 |
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/* Fill in defaults */
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101 |
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|
102 |
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*uid = current->uid;
|
103 |
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*gid = current->gid;
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104 |
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*reserved = 2;
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105 |
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*root = -1;
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106 |
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*blocksize = -1;
|
107 |
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volume[0] = ':';
|
108 |
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volume[1] = 0;
|
109 |
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*mount_opts = 0;
|
110 |
|
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if (!options)
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111 |
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return 1;
|
112 |
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for (this_char = strtok(options,","); this_char; this_char = strtok(NULL,",")) {
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113 |
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f = 0;
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114 |
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if ((value = strchr(this_char,'=')) != NULL)
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115 |
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*value++ = 0;
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116 |
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if ((optn = "protect") && !strcmp(this_char, optn)) {
|
117 |
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if (value)
|
118 |
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goto out_inv_arg;
|
119 |
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*mount_opts |= SF_IMMUTABLE;
|
120 |
|
|
} else if ((optn = "verbose") && !strcmp(this_char, optn)) {
|
121 |
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if (value)
|
122 |
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goto out_inv_arg;
|
123 |
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*mount_opts |= SF_VERBOSE;
|
124 |
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|
} else if ((optn = "mufs") && !strcmp(this_char, optn)) {
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125 |
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if (value)
|
126 |
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goto out_inv_arg;
|
127 |
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*mount_opts |= SF_MUFS;
|
128 |
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|
} else if ((f = !strcmp(this_char,"setuid")) || !strcmp(this_char,"setgid")) {
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129 |
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if (value) {
|
130 |
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|
if (!*value) {
|
131 |
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printk("AFFS: Argument for set[ug]id option missing\n");
|
132 |
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return 0;
|
133 |
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|
} else {
|
134 |
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(f ? *uid : *gid) = simple_strtoul(value,&value,0);
|
135 |
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if (*value) {
|
136 |
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printk("AFFS: Bad set[ug]id argument\n");
|
137 |
|
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return 0;
|
138 |
|
|
}
|
139 |
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*mount_opts |= f ? SF_SETUID : SF_SETGID;
|
140 |
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|
}
|
141 |
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|
}
|
142 |
|
|
} else if (!strcmp(this_char,"prefix")) {
|
143 |
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optn = "prefix";
|
144 |
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if (!value || !*value)
|
145 |
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goto out_no_arg;
|
146 |
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if (*prefix) { /* Free any previous prefix */
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147 |
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kfree(*prefix);
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148 |
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*prefix = NULL;
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149 |
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}
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150 |
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*prefix = kmalloc(strlen(value) + 1,GFP_KERNEL);
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151 |
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if (!*prefix)
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152 |
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return 0;
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153 |
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strcpy(*prefix,value);
|
154 |
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*mount_opts |= SF_PREFIX;
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155 |
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} else if (!strcmp(this_char,"volume")) {
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156 |
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optn = "volume";
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157 |
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if (!value || !*value)
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158 |
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goto out_no_arg;
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159 |
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if (strlen(value) > 30)
|
160 |
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value[30] = 0;
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161 |
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strncpy(volume,value,30);
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162 |
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} else if (!strcmp(this_char,"mode")) {
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163 |
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optn = "mode";
|
164 |
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if (!value || !*value)
|
165 |
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goto out_no_arg;
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166 |
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*mode = simple_strtoul(value,&value,8) & 0777;
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167 |
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if (*value)
|
168 |
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return 0;
|
169 |
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*mount_opts |= SF_SETMODE;
|
170 |
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} else if (!strcmp(this_char,"reserved")) {
|
171 |
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optn = "reserved";
|
172 |
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if (!value || !*value)
|
173 |
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goto out_no_arg;
|
174 |
|
|
*reserved = simple_strtoul(value,&value,0);
|
175 |
|
|
if (*value)
|
176 |
|
|
return 0;
|
177 |
|
|
} else if (!strcmp(this_char,"root")) {
|
178 |
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optn = "root";
|
179 |
|
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if (!value || !*value)
|
180 |
|
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goto out_no_arg;
|
181 |
|
|
*root = simple_strtoul(value,&value,0);
|
182 |
|
|
if (*value)
|
183 |
|
|
return 0;
|
184 |
|
|
} else if (!strcmp(this_char,"bs")) {
|
185 |
|
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optn = "bs";
|
186 |
|
|
if (!value || !*value)
|
187 |
|
|
goto out_no_arg;
|
188 |
|
|
*blocksize = simple_strtoul(value,&value,0);
|
189 |
|
|
if (*value)
|
190 |
|
|
return 0;
|
191 |
|
|
if (*blocksize != 512 && *blocksize != 1024 && *blocksize != 2048
|
192 |
|
|
&& *blocksize != 4096) {
|
193 |
|
|
printk ("AFFS: Invalid blocksize (512, 1024, 2048, 4096 allowed)\n");
|
194 |
|
|
return 0;
|
195 |
|
|
}
|
196 |
|
|
} else if (!strcmp (this_char, "grpquota")
|
197 |
|
|
|| !strcmp (this_char, "noquota")
|
198 |
|
|
|| !strcmp (this_char, "quota")
|
199 |
|
|
|| !strcmp (this_char, "usrquota"))
|
200 |
|
|
/* Silently ignore the quota options */
|
201 |
|
|
;
|
202 |
|
|
else {
|
203 |
|
|
printk("AFFS: Unrecognized mount option %s\n", this_char);
|
204 |
|
|
return 0;
|
205 |
|
|
}
|
206 |
|
|
}
|
207 |
|
|
return 1;
|
208 |
|
|
|
209 |
|
|
out_no_arg:
|
210 |
|
|
printk("AFFS: The %s option requires an argument\n", optn);
|
211 |
|
|
return 0;
|
212 |
|
|
out_inv_arg:
|
213 |
|
|
printk("AFFS: Option %s does not take an argument\n", optn);
|
214 |
|
|
return 0;
|
215 |
|
|
}
|
216 |
|
|
|
217 |
|
|
/* This function definitely needs to be split up. Some fine day I'll
|
218 |
|
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* hopefully have the guts to do so. Until then: sorry for the mess.
|
219 |
|
|
*/
|
220 |
|
|
|
221 |
|
|
static struct super_block *
|
222 |
|
|
affs_read_super(struct super_block *sb, void *data, int silent)
|
223 |
|
|
{
|
224 |
|
|
struct buffer_head *root_bh = NULL;
|
225 |
|
|
struct buffer_head *boot_bh;
|
226 |
|
|
struct inode *root_inode = NULL;
|
227 |
|
|
kdev_t dev = sb->s_dev;
|
228 |
|
|
s32 root_block;
|
229 |
|
|
int blocks, size, blocksize;
|
230 |
|
|
u32 chksum;
|
231 |
|
|
int num_bm;
|
232 |
|
|
int i, j;
|
233 |
|
|
s32 key;
|
234 |
|
|
uid_t uid;
|
235 |
|
|
gid_t gid;
|
236 |
|
|
int reserved;
|
237 |
|
|
unsigned long mount_flags;
|
238 |
|
|
|
239 |
|
|
pr_debug("AFFS: read_super(%s)\n",data ? (const char *)data : "no options");
|
240 |
|
|
|
241 |
|
|
sb->s_magic = AFFS_SUPER_MAGIC;
|
242 |
|
|
sb->s_op = &affs_sops;
|
243 |
|
|
memset(AFFS_SB, 0, sizeof(*AFFS_SB));
|
244 |
|
|
init_MUTEX(&AFFS_SB->s_bmlock);
|
245 |
|
|
|
246 |
|
|
if (!parse_options(data,&uid,&gid,&i,&reserved,&root_block,
|
247 |
|
|
&blocksize,&AFFS_SB->s_prefix,
|
248 |
|
|
AFFS_SB->s_volume, &mount_flags)) {
|
249 |
|
|
printk(KERN_ERR "AFFS: Error parsing options\n");
|
250 |
|
|
return NULL;
|
251 |
|
|
}
|
252 |
|
|
/* N.B. after this point s_prefix must be released */
|
253 |
|
|
|
254 |
|
|
AFFS_SB->s_flags = mount_flags;
|
255 |
|
|
AFFS_SB->s_mode = i;
|
256 |
|
|
AFFS_SB->s_uid = uid;
|
257 |
|
|
AFFS_SB->s_gid = gid;
|
258 |
|
|
AFFS_SB->s_reserved= reserved;
|
259 |
|
|
|
260 |
|
|
/* Get the size of the device in 512-byte blocks.
|
261 |
|
|
* If we later see that the partition uses bigger
|
262 |
|
|
* blocks, we will have to change it.
|
263 |
|
|
*/
|
264 |
|
|
|
265 |
|
|
blocks = blk_size[MAJOR(dev)] ? blk_size[MAJOR(dev)][MINOR(dev)] : 0;
|
266 |
|
|
if (!blocks) {
|
267 |
|
|
printk(KERN_ERR "AFFS: Could not determine device size\n");
|
268 |
|
|
goto out_error;
|
269 |
|
|
}
|
270 |
|
|
size = (BLOCK_SIZE / 512) * blocks;
|
271 |
|
|
pr_debug("AFFS: initial blksize=%d, blocks=%d\n", 512, blocks);
|
272 |
|
|
|
273 |
|
|
affs_set_blocksize(sb, PAGE_SIZE);
|
274 |
|
|
/* Try to find root block. Its location depends on the block size. */
|
275 |
|
|
|
276 |
|
|
i = 512;
|
277 |
|
|
j = 4096;
|
278 |
|
|
if (blocksize > 0) {
|
279 |
|
|
i = j = blocksize;
|
280 |
|
|
size = size / (blocksize / 512);
|
281 |
|
|
}
|
282 |
|
|
for (blocksize = i, key = 0; blocksize <= j; blocksize <<= 1, size >>= 1) {
|
283 |
|
|
AFFS_SB->s_root_block = root_block;
|
284 |
|
|
if (root_block < 0)
|
285 |
|
|
AFFS_SB->s_root_block = (reserved + size - 1) / 2;
|
286 |
|
|
pr_debug("AFFS: setting blocksize to %d\n", blocksize);
|
287 |
|
|
affs_set_blocksize(sb, blocksize);
|
288 |
|
|
AFFS_SB->s_partition_size = size;
|
289 |
|
|
|
290 |
|
|
/* The root block location that was calculated above is not
|
291 |
|
|
* correct if the partition size is an odd number of 512-
|
292 |
|
|
* byte blocks, which will be rounded down to a number of
|
293 |
|
|
* 1024-byte blocks, and if there were an even number of
|
294 |
|
|
* reserved blocks. Ideally, all partition checkers should
|
295 |
|
|
* report the real number of blocks of the real blocksize,
|
296 |
|
|
* but since this just cannot be done, we have to try to
|
297 |
|
|
* find the root block anyways. In the above case, it is one
|
298 |
|
|
* block behind the calculated one. So we check this one, too.
|
299 |
|
|
*/
|
300 |
|
|
for (num_bm = 0; num_bm < 2; num_bm++) {
|
301 |
|
|
pr_debug("AFFS: Dev %s, trying root=%u, bs=%d, "
|
302 |
|
|
"size=%d, reserved=%d\n",
|
303 |
|
|
kdevname(dev),
|
304 |
|
|
AFFS_SB->s_root_block + num_bm,
|
305 |
|
|
blocksize, size, reserved);
|
306 |
|
|
root_bh = affs_bread(sb, AFFS_SB->s_root_block + num_bm);
|
307 |
|
|
if (!root_bh)
|
308 |
|
|
continue;
|
309 |
|
|
if (!affs_checksum_block(sb, root_bh) &&
|
310 |
|
|
be32_to_cpu(AFFS_ROOT_HEAD(root_bh)->ptype) == T_SHORT &&
|
311 |
|
|
be32_to_cpu(AFFS_ROOT_TAIL(sb, root_bh)->stype) == ST_ROOT) {
|
312 |
|
|
AFFS_SB->s_hashsize = blocksize / 4 - 56;
|
313 |
|
|
AFFS_SB->s_root_block += num_bm;
|
314 |
|
|
key = 1;
|
315 |
|
|
goto got_root;
|
316 |
|
|
}
|
317 |
|
|
affs_brelse(root_bh);
|
318 |
|
|
root_bh = NULL;
|
319 |
|
|
}
|
320 |
|
|
}
|
321 |
|
|
if (!silent)
|
322 |
|
|
printk(KERN_ERR "AFFS: No valid root block on device %s\n",
|
323 |
|
|
kdevname(dev));
|
324 |
|
|
goto out_error;
|
325 |
|
|
|
326 |
|
|
/* N.B. after this point bh must be released */
|
327 |
|
|
got_root:
|
328 |
|
|
root_block = AFFS_SB->s_root_block;
|
329 |
|
|
|
330 |
|
|
sb->s_blocksize_bits = blocksize == 512 ? 9 :
|
331 |
|
|
blocksize == 1024 ? 10 :
|
332 |
|
|
blocksize == 2048 ? 11 : 12;
|
333 |
|
|
|
334 |
|
|
/* Find out which kind of FS we have */
|
335 |
|
|
boot_bh = sb_bread(sb, 0);
|
336 |
|
|
if (!boot_bh) {
|
337 |
|
|
printk(KERN_ERR "AFFS: Cannot read boot block\n");
|
338 |
|
|
goto out_error;
|
339 |
|
|
}
|
340 |
|
|
chksum = be32_to_cpu(*(u32 *)boot_bh->b_data);
|
341 |
|
|
brelse(boot_bh);
|
342 |
|
|
|
343 |
|
|
/* Dircache filesystems are compatible with non-dircache ones
|
344 |
|
|
* when reading. As long as they aren't supported, writing is
|
345 |
|
|
* not recommended.
|
346 |
|
|
*/
|
347 |
|
|
if ((chksum == FS_DCFFS || chksum == MUFS_DCFFS || chksum == FS_DCOFS
|
348 |
|
|
|| chksum == MUFS_DCOFS) && !(sb->s_flags & MS_RDONLY)) {
|
349 |
|
|
printk(KERN_NOTICE "AFFS: Dircache FS - mounting %s read only\n",
|
350 |
|
|
kdevname(dev));
|
351 |
|
|
sb->s_flags |= MS_RDONLY;
|
352 |
|
|
AFFS_SB->s_flags |= SF_READONLY;
|
353 |
|
|
}
|
354 |
|
|
switch (chksum) {
|
355 |
|
|
case MUFS_FS:
|
356 |
|
|
case MUFS_INTLFFS:
|
357 |
|
|
case MUFS_DCFFS:
|
358 |
|
|
AFFS_SB->s_flags |= SF_MUFS;
|
359 |
|
|
/* fall thru */
|
360 |
|
|
case FS_INTLFFS:
|
361 |
|
|
case FS_DCFFS:
|
362 |
|
|
AFFS_SB->s_flags |= SF_INTL;
|
363 |
|
|
break;
|
364 |
|
|
case MUFS_FFS:
|
365 |
|
|
AFFS_SB->s_flags |= SF_MUFS;
|
366 |
|
|
break;
|
367 |
|
|
case FS_FFS:
|
368 |
|
|
break;
|
369 |
|
|
case MUFS_OFS:
|
370 |
|
|
AFFS_SB->s_flags |= SF_MUFS;
|
371 |
|
|
/* fall thru */
|
372 |
|
|
case FS_OFS:
|
373 |
|
|
AFFS_SB->s_flags |= SF_OFS;
|
374 |
|
|
sb->s_flags |= MS_NOEXEC;
|
375 |
|
|
break;
|
376 |
|
|
case MUFS_DCOFS:
|
377 |
|
|
case MUFS_INTLOFS:
|
378 |
|
|
AFFS_SB->s_flags |= SF_MUFS;
|
379 |
|
|
case FS_DCOFS:
|
380 |
|
|
case FS_INTLOFS:
|
381 |
|
|
AFFS_SB->s_flags |= SF_INTL | SF_OFS;
|
382 |
|
|
sb->s_flags |= MS_NOEXEC;
|
383 |
|
|
break;
|
384 |
|
|
default:
|
385 |
|
|
printk(KERN_ERR "AFFS: Unknown filesystem on device %s: %08X\n",
|
386 |
|
|
kdevname(dev), chksum);
|
387 |
|
|
goto out_error;
|
388 |
|
|
}
|
389 |
|
|
|
390 |
|
|
if (mount_flags & SF_VERBOSE) {
|
391 |
|
|
chksum = cpu_to_be32(chksum);
|
392 |
|
|
printk(KERN_NOTICE "AFFS: Mounting volume \"%*s\": Type=%.3s\\%c, Blocksize=%d\n",
|
393 |
|
|
AFFS_ROOT_TAIL(sb, root_bh)->disk_name[0],
|
394 |
|
|
AFFS_ROOT_TAIL(sb, root_bh)->disk_name + 1,
|
395 |
|
|
(char *)&chksum,((char *)&chksum)[3] + '0',blocksize);
|
396 |
|
|
}
|
397 |
|
|
|
398 |
|
|
sb->s_flags |= MS_NODEV | MS_NOSUID;
|
399 |
|
|
|
400 |
|
|
AFFS_SB->s_data_blksize = sb->s_blocksize;
|
401 |
|
|
if (AFFS_SB->s_flags & SF_OFS)
|
402 |
|
|
AFFS_SB->s_data_blksize -= 24;
|
403 |
|
|
|
404 |
|
|
/* Keep super block in cache */
|
405 |
|
|
AFFS_SB->s_root_bh = root_bh;
|
406 |
|
|
/* N.B. after this point s_root_bh must be released */
|
407 |
|
|
|
408 |
|
|
if (affs_init_bitmap(sb))
|
409 |
|
|
goto out_error;
|
410 |
|
|
|
411 |
|
|
/* set up enough so that it can read an inode */
|
412 |
|
|
|
413 |
|
|
root_inode = iget(sb, root_block);
|
414 |
|
|
sb->s_root = d_alloc_root(root_inode);
|
415 |
|
|
if (!sb->s_root) {
|
416 |
|
|
printk(KERN_ERR "AFFS: Get root inode failed\n");
|
417 |
|
|
goto out_error;
|
418 |
|
|
}
|
419 |
|
|
sb->s_root->d_op = &affs_dentry_operations;
|
420 |
|
|
|
421 |
|
|
pr_debug("AFFS: s_flags=%lX\n",sb->s_flags);
|
422 |
|
|
return sb;
|
423 |
|
|
|
424 |
|
|
/*
|
425 |
|
|
* Begin the cascaded cleanup ...
|
426 |
|
|
*/
|
427 |
|
|
out_error:
|
428 |
|
|
if (root_inode)
|
429 |
|
|
iput(root_inode);
|
430 |
|
|
if (AFFS_SB->s_bitmap)
|
431 |
|
|
kfree(AFFS_SB->s_bitmap);
|
432 |
|
|
affs_brelse(root_bh);
|
433 |
|
|
if (AFFS_SB->s_prefix)
|
434 |
|
|
kfree(AFFS_SB->s_prefix);
|
435 |
|
|
return NULL;
|
436 |
|
|
}
|
437 |
|
|
|
438 |
|
|
static int
|
439 |
|
|
affs_remount(struct super_block *sb, int *flags, char *data)
|
440 |
|
|
{
|
441 |
|
|
int blocksize;
|
442 |
|
|
uid_t uid;
|
443 |
|
|
gid_t gid;
|
444 |
|
|
int mode;
|
445 |
|
|
int reserved;
|
446 |
|
|
int root_block;
|
447 |
|
|
unsigned long mount_flags;
|
448 |
|
|
unsigned long read_only = AFFS_SB->s_flags & SF_READONLY;
|
449 |
|
|
|
450 |
|
|
pr_debug("AFFS: remount(flags=0x%x,opts=\"%s\")\n",*flags,data);
|
451 |
|
|
|
452 |
|
|
if (!parse_options(data,&uid,&gid,&mode,&reserved,&root_block,
|
453 |
|
|
&blocksize,&AFFS_SB->s_prefix,AFFS_SB->s_volume,&mount_flags))
|
454 |
|
|
return -EINVAL;
|
455 |
|
|
AFFS_SB->s_flags = mount_flags | read_only;
|
456 |
|
|
AFFS_SB->s_mode = mode;
|
457 |
|
|
AFFS_SB->s_uid = uid;
|
458 |
|
|
AFFS_SB->s_gid = gid;
|
459 |
|
|
|
460 |
|
|
if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
|
461 |
|
|
return 0;
|
462 |
|
|
if (*flags & MS_RDONLY) {
|
463 |
|
|
sb->s_dirt = 1;
|
464 |
|
|
while (sb->s_dirt)
|
465 |
|
|
affs_write_super(sb);
|
466 |
|
|
sb->s_flags |= MS_RDONLY;
|
467 |
|
|
} else if (!(AFFS_SB->s_flags & SF_READONLY)) {
|
468 |
|
|
sb->s_flags &= ~MS_RDONLY;
|
469 |
|
|
} else {
|
470 |
|
|
affs_warning(sb,"remount","Cannot remount fs read/write because of errors");
|
471 |
|
|
return -EINVAL;
|
472 |
|
|
}
|
473 |
|
|
return 0;
|
474 |
|
|
}
|
475 |
|
|
|
476 |
|
|
static int
|
477 |
|
|
affs_statfs(struct super_block *sb, struct statfs *buf)
|
478 |
|
|
{
|
479 |
|
|
int free;
|
480 |
|
|
|
481 |
|
|
pr_debug("AFFS: statfs() partsize=%d, reserved=%d\n",AFFS_SB->s_partition_size,
|
482 |
|
|
AFFS_SB->s_reserved);
|
483 |
|
|
|
484 |
|
|
free = affs_count_free_blocks(sb);
|
485 |
|
|
buf->f_type = AFFS_SUPER_MAGIC;
|
486 |
|
|
buf->f_bsize = sb->s_blocksize;
|
487 |
|
|
buf->f_blocks = AFFS_SB->s_partition_size - AFFS_SB->s_reserved;
|
488 |
|
|
buf->f_bfree = free;
|
489 |
|
|
buf->f_bavail = free;
|
490 |
|
|
return 0;
|
491 |
|
|
}
|
492 |
|
|
|
493 |
|
|
static DECLARE_FSTYPE_DEV(affs_fs_type, "affs", affs_read_super);
|
494 |
|
|
|
495 |
|
|
static int __init init_affs_fs(void)
|
496 |
|
|
{
|
497 |
|
|
return register_filesystem(&affs_fs_type);
|
498 |
|
|
}
|
499 |
|
|
|
500 |
|
|
static void __exit exit_affs_fs(void)
|
501 |
|
|
{
|
502 |
|
|
unregister_filesystem(&affs_fs_type);
|
503 |
|
|
}
|
504 |
|
|
|
505 |
|
|
EXPORT_NO_SYMBOLS;
|
506 |
|
|
|
507 |
|
|
MODULE_DESCRIPTION("Amiga filesystem support for Linux");
|
508 |
|
|
MODULE_LICENSE("GPL");
|
509 |
|
|
|
510 |
|
|
module_init(init_affs_fs)
|
511 |
|
|
module_exit(exit_affs_fs)
|