blob: 830332021ed47bd33e5dca5d903f5725db1ba7c5 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
Randy Dunlap16f7e0f2006-01-11 12:17:46 -08005#include <linux/capability.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006#include <linux/fs.h>
Dave Hansen42a74f22008-02-15 14:37:46 -08007#include <linux/mount.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -07008#include <linux/reiserfs_fs.h>
9#include <linux/time.h>
10#include <asm/uaccess.h>
11#include <linux/pagemap.h>
12#include <linux/smp_lock.h>
David Howells52b499c2006-08-29 19:06:18 +010013#include <linux/compat.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014
Linus Torvalds1da177e2005-04-16 15:20:36 -070015/*
16** reiserfs_ioctl - handler for ioctl for inode
17** supported commands:
18** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
19** and prevent packing file (argument arg has to be non-zero)
20** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
21** 3) That's all for a while ...
22*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070023int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
24 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070025{
26 unsigned int flags;
Dave Hansen42a74f22008-02-15 14:37:46 -080027 int err = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
29 switch (cmd) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070030 case REISERFS_IOC_UNPACK:
31 if (S_ISREG(inode->i_mode)) {
32 if (arg)
33 return reiserfs_unpack(inode, filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 else
35 return 0;
36 } else
37 return -ENOTTY;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070038 /* following two cases are taken from fs/ext2/ioctl.c by Remy
39 Card (card@masi.ibp.fr) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070040 case REISERFS_IOC_GETFLAGS:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070041 if (!reiserfs_attrs(inode->i_sb))
Jeff Mahoney869eb762005-06-29 18:52:28 -040042 return -ENOTTY;
43
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070044 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;
Jeff Mahoney869eb762005-06-29 18:52:28 -040050
Dave Hansen42a74f22008-02-15 14:37:46 -080051 err = mnt_want_write(filp->f_path.mnt);
52 if (err)
53 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
Dave Hansen42a74f22008-02-15 14:37:46 -080055 if (!is_owner_or_cap(inode)) {
56 err = -EPERM;
57 goto setflags_out;
58 }
59 if (get_user(flags, (int __user *)arg)) {
60 err = -EFAULT;
61 goto setflags_out;
62 }
63 /*
64 * Is it quota file? Do not allow user to mess with it
65 */
66 if (IS_NOQUOTA(inode)) {
67 err = -EPERM;
68 goto setflags_out;
69 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070070 if (((flags ^ REISERFS_I(inode)->
71 i_attrs) & (REISERFS_IMMUTABLE_FL |
72 REISERFS_APPEND_FL))
Dave Hansen42a74f22008-02-15 14:37:46 -080073 && !capable(CAP_LINUX_IMMUTABLE)) {
74 err = -EPERM;
75 goto setflags_out;
76 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070077 if ((flags & REISERFS_NOTAIL_FL) &&
78 S_ISREG(inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 int result;
80
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070081 result = reiserfs_unpack(inode, filp);
Dave Hansen42a74f22008-02-15 14:37:46 -080082 if (result) {
83 err = result;
84 goto setflags_out;
85 }
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070086 }
87 sd_attrs_to_i_attrs(flags, inode);
88 REISERFS_I(inode)->i_attrs = flags;
89 inode->i_ctime = CURRENT_TIME_SEC;
90 mark_inode_dirty(inode);
Dave Hansen42a74f22008-02-15 14:37:46 -080091setflags_out:
92 mnt_drop_write(filp->f_path.mnt);
93 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 case REISERFS_IOC_GETVERSION:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070096 return put_user(inode->i_generation, (int __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 case REISERFS_IOC_SETVERSION:
Satyam Sharma3bd858a2007-07-17 15:00:08 +053098 if (!is_owner_or_cap(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 return -EPERM;
Dave Hansen42a74f22008-02-15 14:37:46 -0800100 err = mnt_want_write(filp->f_path.mnt);
101 if (err)
102 return err;
103 if (get_user(inode->i_generation, (int __user *)arg)) {
104 err = -EFAULT;
105 goto setversion_out;
106 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 inode->i_ctime = CURRENT_TIME_SEC;
108 mark_inode_dirty(inode);
Dave Hansen42a74f22008-02-15 14:37:46 -0800109setversion_out:
110 mnt_drop_write(filp->f_path.mnt);
111 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112 default:
113 return -ENOTTY;
114 }
115}
116
David Howells52b499c2006-08-29 19:06:18 +0100117#ifdef CONFIG_COMPAT
118long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
119 unsigned long arg)
120{
Josef Sipek1fc5adb2006-12-08 02:37:33 -0800121 struct inode *inode = file->f_path.dentry->d_inode;
David Howells52b499c2006-08-29 19:06:18 +0100122 int ret;
123
124 /* These are just misnamed, they actually get/put from/to user an int */
125 switch (cmd) {
126 case REISERFS_IOC32_UNPACK:
127 cmd = REISERFS_IOC_UNPACK;
128 break;
129 case REISERFS_IOC32_GETFLAGS:
130 cmd = REISERFS_IOC_GETFLAGS;
131 break;
132 case REISERFS_IOC32_SETFLAGS:
133 cmd = REISERFS_IOC_SETFLAGS;
134 break;
135 case REISERFS_IOC32_GETVERSION:
136 cmd = REISERFS_IOC_GETVERSION;
137 break;
138 case REISERFS_IOC32_SETVERSION:
139 cmd = REISERFS_IOC_SETVERSION;
140 break;
141 default:
142 return -ENOIOCTLCMD;
143 }
144 lock_kernel();
145 ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
146 unlock_kernel();
147 return ret;
148}
149#endif
150
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700151int reiserfs_commit_write(struct file *f, struct page *page,
152 unsigned from, unsigned to);
153int reiserfs_prepare_write(struct file *f, struct page *page,
154 unsigned from, unsigned to);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155/*
156** reiserfs_unpack
157** Function try to convert tail from direct item into indirect.
158** It set up nopack attribute in the REISERFS_I(inode)->nopack
159*/
Jan Karad5dee5c2008-04-28 02:16:23 -0700160int reiserfs_unpack(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700162 int retval = 0;
163 int index;
164 struct page *page;
165 struct address_space *mapping;
166 unsigned long write_from;
167 unsigned long blocksize = inode->i_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700169 if (inode->i_size == 0) {
170 REISERFS_I(inode)->i_flags |= i_nopack_mask;
171 return 0;
172 }
173 /* ioctl already done */
174 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
175 return 0;
176 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700178 /* we need to make sure nobody is changing the file size beneath
179 ** us
180 */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800181 mutex_lock(&inode->i_mutex);
Chris Masonb5f39532006-08-05 12:15:08 -0700182 reiserfs_write_lock(inode->i_sb);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700183
184 write_from = inode->i_size & (blocksize - 1);
185 /* if we are on a block boundary, we are already unpacked. */
186 if (write_from == 0) {
187 REISERFS_I(inode)->i_flags |= i_nopack_mask;
188 goto out;
189 }
190
191 /* we unpack by finding the page with the tail, and calling
192 ** reiserfs_prepare_write on that page. This will force a
193 ** reiserfs_get_block to unpack the tail for us.
194 */
195 index = inode->i_size >> PAGE_CACHE_SHIFT;
196 mapping = inode->i_mapping;
197 page = grab_cache_page(mapping, index);
198 retval = -ENOMEM;
199 if (!page) {
200 goto out;
201 }
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700202 retval = reiserfs_prepare_write(NULL, page, write_from, write_from);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700203 if (retval)
204 goto out_unlock;
205
206 /* conversion can change page contents, must flush */
207 flush_dcache_page(page);
Vladimir Savelievba9d8ce2007-10-16 01:25:14 -0700208 retval = reiserfs_commit_write(NULL, page, write_from, write_from);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 REISERFS_I(inode)->i_flags |= i_nopack_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700211 out_unlock:
212 unlock_page(page);
213 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700215 out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800216 mutex_unlock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700217 reiserfs_write_unlock(inode->i_sb);
218 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}