1 /*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
5 #include <linux/capability.h>
6 #include <linux/fs.h>
7 #include <linux/mount.h>
8 #include "reiserfs.h"
9 #include <linux/time.h>
10 #include <linux/uaccess.h>
11 #include <linux/pagemap.h>
12 #include <linux/compat.h>
13 #include <linux/fileattr.h>
14
reiserfs_fileattr_get(struct dentry * dentry,struct fileattr * fa)15 int reiserfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
16 {
17 struct inode *inode = d_inode(dentry);
18
19 if (!reiserfs_attrs(inode->i_sb))
20 return -ENOTTY;
21
22 fileattr_fill_flags(fa, REISERFS_I(inode)->i_attrs);
23
24 return 0;
25 }
26
reiserfs_fileattr_set(struct user_namespace * mnt_userns,struct dentry * dentry,struct fileattr * fa)27 int reiserfs_fileattr_set(struct user_namespace *mnt_userns,
28 struct dentry *dentry, struct fileattr *fa)
29 {
30 struct inode *inode = d_inode(dentry);
31 unsigned int flags = fa->flags;
32 int err;
33
34 reiserfs_write_lock(inode->i_sb);
35
36 err = -ENOTTY;
37 if (!reiserfs_attrs(inode->i_sb))
38 goto unlock;
39
40 err = -EOPNOTSUPP;
41 if (fileattr_has_fsx(fa))
42 goto unlock;
43
44 /*
45 * Is it quota file? Do not allow user to mess with it
46 */
47 err = -EPERM;
48 if (IS_NOQUOTA(inode))
49 goto unlock;
50
51 if ((flags & REISERFS_NOTAIL_FL) && S_ISREG(inode->i_mode)) {
52 err = reiserfs_unpack(inode);
53 if (err)
54 goto unlock;
55 }
56 sd_attrs_to_i_attrs(flags, inode);
57 REISERFS_I(inode)->i_attrs = flags;
58 inode->i_ctime = current_time(inode);
59 mark_inode_dirty(inode);
60 err = 0;
61 unlock:
62 reiserfs_write_unlock(inode->i_sb);
63
64 return err;
65 }
66
67 /*
68 * reiserfs_ioctl - handler for ioctl for inode
69 * supported commands:
70 * 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
71 * and prevent packing file (argument arg has t
72 * be non-zero)
73 * 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
74 * 3) That's all for a while ...
75 */
reiserfs_ioctl(struct file * filp,unsigned int cmd,unsigned long arg)76 long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
77 {
78 struct inode *inode = file_inode(filp);
79 int err = 0;
80
81 reiserfs_write_lock(inode->i_sb);
82
83 switch (cmd) {
84 case REISERFS_IOC_UNPACK:
85 if (S_ISREG(inode->i_mode)) {
86 if (arg)
87 err = reiserfs_unpack(inode);
88 } else
89 err = -ENOTTY;
90 break;
91 /*
92 * following two cases are taken from fs/ext2/ioctl.c by Remy
93 * Card (card@masi.ibp.fr)
94 */
95 case REISERFS_IOC_GETVERSION:
96 err = put_user(inode->i_generation, (int __user *)arg);
97 break;
98 case REISERFS_IOC_SETVERSION:
99 if (!inode_owner_or_capable(&init_user_ns, inode)) {
100 err = -EPERM;
101 break;
102 }
103 err = mnt_want_write_file(filp);
104 if (err)
105 break;
106 if (get_user(inode->i_generation, (int __user *)arg)) {
107 err = -EFAULT;
108 goto setversion_out;
109 }
110 inode->i_ctime = current_time(inode);
111 mark_inode_dirty(inode);
112 setversion_out:
113 mnt_drop_write_file(filp);
114 break;
115 default:
116 err = -ENOTTY;
117 }
118
119 reiserfs_write_unlock(inode->i_sb);
120
121 return err;
122 }
123
124 #ifdef CONFIG_COMPAT
reiserfs_compat_ioctl(struct file * file,unsigned int cmd,unsigned long arg)125 long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
126 unsigned long arg)
127 {
128 /*
129 * These are just misnamed, they actually
130 * get/put from/to user an int
131 */
132 switch (cmd) {
133 case REISERFS_IOC32_UNPACK:
134 cmd = REISERFS_IOC_UNPACK;
135 break;
136 case REISERFS_IOC32_GETVERSION:
137 cmd = REISERFS_IOC_GETVERSION;
138 break;
139 case REISERFS_IOC32_SETVERSION:
140 cmd = REISERFS_IOC_SETVERSION;
141 break;
142 default:
143 return -ENOIOCTLCMD;
144 }
145
146 return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
147 }
148 #endif
149
150 int reiserfs_commit_write(struct file *f, struct page *page,
151 unsigned from, unsigned to);
152 /*
153 * reiserfs_unpack
154 * Function try to convert tail from direct item into indirect.
155 * It set up nopack attribute in the REISERFS_I(inode)->nopack
156 */
reiserfs_unpack(struct inode * inode)157 int reiserfs_unpack(struct inode *inode)
158 {
159 int retval = 0;
160 int index;
161 struct page *page;
162 struct address_space *mapping;
163 unsigned long write_from;
164 unsigned long blocksize = inode->i_sb->s_blocksize;
165
166 if (inode->i_size == 0) {
167 REISERFS_I(inode)->i_flags |= i_nopack_mask;
168 return 0;
169 }
170 /* ioctl already done */
171 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
172 return 0;
173 }
174
175 /* we need to make sure nobody is changing the file size beneath us */
176 {
177 int depth = reiserfs_write_unlock_nested(inode->i_sb);
178
179 inode_lock(inode);
180 reiserfs_write_lock_nested(inode->i_sb, depth);
181 }
182
183 reiserfs_write_lock(inode->i_sb);
184
185 write_from = inode->i_size & (blocksize - 1);
186 /* if we are on a block boundary, we are already unpacked. */
187 if (write_from == 0) {
188 REISERFS_I(inode)->i_flags |= i_nopack_mask;
189 goto out;
190 }
191
192 /*
193 * we unpack by finding the page with the tail, and calling
194 * __reiserfs_write_begin on that page. This will force a
195 * reiserfs_get_block to unpack the tail for us.
196 */
197 index = inode->i_size >> PAGE_SHIFT;
198 mapping = inode->i_mapping;
199 page = grab_cache_page(mapping, index);
200 retval = -ENOMEM;
201 if (!page) {
202 goto out;
203 }
204 retval = __reiserfs_write_begin(page, write_from, 0);
205 if (retval)
206 goto out_unlock;
207
208 /* conversion can change page contents, must flush */
209 flush_dcache_page(page);
210 retval = reiserfs_commit_write(NULL, page, write_from, write_from);
211 REISERFS_I(inode)->i_flags |= i_nopack_mask;
212
213 out_unlock:
214 unlock_page(page);
215 put_page(page);
216
217 out:
218 inode_unlock(inode);
219 reiserfs_write_unlock(inode->i_sb);
220 return retval;
221 }
222
