Linux 2.6.25
[linux-2.6/s3c2410-cpufreq.git] / fs / reiserfs / ioctl.c
blobe0f0f098a523a8d1c3a41099ab76b411989a23a0
1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
5 #include <linux/capability.h>
6 #include <linux/fs.h>
7 #include <linux/reiserfs_fs.h>
8 #include <linux/time.h>
9 #include <asm/uaccess.h>
10 #include <linux/pagemap.h>
11 #include <linux/smp_lock.h>
12 #include <linux/compat.h>
14 static int reiserfs_unpack(struct inode *inode, struct file *filp);
17 ** reiserfs_ioctl - handler for ioctl for inode
18 ** supported commands:
19 ** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
20 ** and prevent packing file (argument arg has to be non-zero)
21 ** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
22 ** 3) That's all for a while ...
24 int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
25 unsigned long arg)
27 unsigned int flags;
29 switch (cmd) {
30 case REISERFS_IOC_UNPACK:
31 if (S_ISREG(inode->i_mode)) {
32 if (arg)
33 return reiserfs_unpack(inode, filp);
34 else
35 return 0;
36 } else
37 return -ENOTTY;
38 /* following two cases are taken from fs/ext2/ioctl.c by Remy
39 Card (card@masi.ibp.fr) */
40 case REISERFS_IOC_GETFLAGS:
41 if (!reiserfs_attrs(inode->i_sb))
42 return -ENOTTY;
44 flags = REISERFS_I(inode)->i_attrs;
45 i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
46 return put_user(flags, (int __user *)arg);
47 case REISERFS_IOC_SETFLAGS:{
48 if (!reiserfs_attrs(inode->i_sb))
49 return -ENOTTY;
51 if (IS_RDONLY(inode))
52 return -EROFS;
54 if (!is_owner_or_cap(inode))
55 return -EPERM;
57 if (get_user(flags, (int __user *)arg))
58 return -EFAULT;
60 /* Is it quota file? Do not allow user to mess with it. */
61 if (IS_NOQUOTA(inode))
62 return -EPERM;
63 if (((flags ^ REISERFS_I(inode)->
64 i_attrs) & (REISERFS_IMMUTABLE_FL |
65 REISERFS_APPEND_FL))
66 && !capable(CAP_LINUX_IMMUTABLE))
67 return -EPERM;
69 if ((flags & REISERFS_NOTAIL_FL) &&
70 S_ISREG(inode->i_mode)) {
71 int result;
73 result = reiserfs_unpack(inode, filp);
74 if (result)
75 return result;
77 sd_attrs_to_i_attrs(flags, inode);
78 REISERFS_I(inode)->i_attrs = flags;
79 inode->i_ctime = CURRENT_TIME_SEC;
80 mark_inode_dirty(inode);
81 return 0;
83 case REISERFS_IOC_GETVERSION:
84 return put_user(inode->i_generation, (int __user *)arg);
85 case REISERFS_IOC_SETVERSION:
86 if (!is_owner_or_cap(inode))
87 return -EPERM;
88 if (IS_RDONLY(inode))
89 return -EROFS;
90 if (get_user(inode->i_generation, (int __user *)arg))
91 return -EFAULT;
92 inode->i_ctime = CURRENT_TIME_SEC;
93 mark_inode_dirty(inode);
94 return 0;
95 default:
96 return -ENOTTY;
100 #ifdef CONFIG_COMPAT
101 long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
102 unsigned long arg)
104 struct inode *inode = file->f_path.dentry->d_inode;
105 int ret;
107 /* These are just misnamed, they actually get/put from/to user an int */
108 switch (cmd) {
109 case REISERFS_IOC32_UNPACK:
110 cmd = REISERFS_IOC_UNPACK;
111 break;
112 case REISERFS_IOC32_GETFLAGS:
113 cmd = REISERFS_IOC_GETFLAGS;
114 break;
115 case REISERFS_IOC32_SETFLAGS:
116 cmd = REISERFS_IOC_SETFLAGS;
117 break;
118 case REISERFS_IOC32_GETVERSION:
119 cmd = REISERFS_IOC_GETVERSION;
120 break;
121 case REISERFS_IOC32_SETVERSION:
122 cmd = REISERFS_IOC_SETVERSION;
123 break;
124 default:
125 return -ENOIOCTLCMD;
127 lock_kernel();
128 ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
129 unlock_kernel();
130 return ret;
132 #endif
134 int reiserfs_commit_write(struct file *f, struct page *page,
135 unsigned from, unsigned to);
136 int reiserfs_prepare_write(struct file *f, struct page *page,
137 unsigned from, unsigned to);
139 ** reiserfs_unpack
140 ** Function try to convert tail from direct item into indirect.
141 ** It set up nopack attribute in the REISERFS_I(inode)->nopack
143 static int reiserfs_unpack(struct inode *inode, struct file *filp)
145 int retval = 0;
146 int index;
147 struct page *page;
148 struct address_space *mapping;
149 unsigned long write_from;
150 unsigned long blocksize = inode->i_sb->s_blocksize;
152 if (inode->i_size == 0) {
153 REISERFS_I(inode)->i_flags |= i_nopack_mask;
154 return 0;
156 /* ioctl already done */
157 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
158 return 0;
161 /* we need to make sure nobody is changing the file size beneath
162 ** us
164 mutex_lock(&inode->i_mutex);
165 reiserfs_write_lock(inode->i_sb);
167 write_from = inode->i_size & (blocksize - 1);
168 /* if we are on a block boundary, we are already unpacked. */
169 if (write_from == 0) {
170 REISERFS_I(inode)->i_flags |= i_nopack_mask;
171 goto out;
174 /* we unpack by finding the page with the tail, and calling
175 ** reiserfs_prepare_write on that page. This will force a
176 ** reiserfs_get_block to unpack the tail for us.
178 index = inode->i_size >> PAGE_CACHE_SHIFT;
179 mapping = inode->i_mapping;
180 page = grab_cache_page(mapping, index);
181 retval = -ENOMEM;
182 if (!page) {
183 goto out;
185 retval = reiserfs_prepare_write(NULL, page, write_from, write_from);
186 if (retval)
187 goto out_unlock;
189 /* conversion can change page contents, must flush */
190 flush_dcache_page(page);
191 retval = reiserfs_commit_write(NULL, page, write_from, write_from);
192 REISERFS_I(inode)->i_flags |= i_nopack_mask;
194 out_unlock:
195 unlock_page(page);
196 page_cache_release(page);
198 out:
199 mutex_unlock(&inode->i_mutex);
200 reiserfs_write_unlock(inode->i_sb);
201 return retval;