Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README | |
3 | */ | |
4 | ||
16f7e0fe | 5 | #include <linux/capability.h> |
1da177e4 | 6 | #include <linux/fs.h> |
42a74f20 | 7 | #include <linux/mount.h> |
1da177e4 LT |
8 | #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> | |
52b499c4 | 13 | #include <linux/compat.h> |
1da177e4 | 14 | |
1da177e4 LT |
15 | /* |
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 | */ | |
bd4c625c LT |
23 | int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, |
24 | unsigned long arg) | |
1da177e4 LT |
25 | { |
26 | unsigned int flags; | |
42a74f20 | 27 | int err = 0; |
1da177e4 LT |
28 | |
29 | switch (cmd) { | |
bd4c625c LT |
30 | case REISERFS_IOC_UNPACK: |
31 | if (S_ISREG(inode->i_mode)) { | |
32 | if (arg) | |
33 | return reiserfs_unpack(inode, filp); | |
1da177e4 LT |
34 | else |
35 | return 0; | |
36 | } else | |
37 | return -ENOTTY; | |
bd4c625c LT |
38 | /* following two cases are taken from fs/ext2/ioctl.c by Remy |
39 | Card (card@masi.ibp.fr) */ | |
1da177e4 | 40 | case REISERFS_IOC_GETFLAGS: |
bd4c625c | 41 | if (!reiserfs_attrs(inode->i_sb)) |
869eb76e JM |
42 | return -ENOTTY; |
43 | ||
bd4c625c LT |
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; | |
869eb76e | 50 | |
42a74f20 DH |
51 | err = mnt_want_write(filp->f_path.mnt); |
52 | if (err) | |
53 | return err; | |
1da177e4 | 54 | |
42a74f20 DH |
55 | 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 | } | |
bd4c625c LT |
70 | if (((flags ^ REISERFS_I(inode)-> |
71 | i_attrs) & (REISERFS_IMMUTABLE_FL | | |
72 | REISERFS_APPEND_FL)) | |
42a74f20 DH |
73 | && !capable(CAP_LINUX_IMMUTABLE)) { |
74 | err = -EPERM; | |
75 | goto setflags_out; | |
76 | } | |
bd4c625c LT |
77 | if ((flags & REISERFS_NOTAIL_FL) && |
78 | S_ISREG(inode->i_mode)) { | |
1da177e4 LT |
79 | int result; |
80 | ||
bd4c625c | 81 | result = reiserfs_unpack(inode, filp); |
42a74f20 DH |
82 | if (result) { |
83 | err = result; | |
84 | goto setflags_out; | |
85 | } | |
bd4c625c LT |
86 | } |
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); | |
42a74f20 DH |
91 | setflags_out: |
92 | mnt_drop_write(filp->f_path.mnt); | |
93 | return err; | |
1da177e4 | 94 | } |
1da177e4 | 95 | case REISERFS_IOC_GETVERSION: |
bd4c625c | 96 | return put_user(inode->i_generation, (int __user *)arg); |
1da177e4 | 97 | case REISERFS_IOC_SETVERSION: |
3bd858ab | 98 | if (!is_owner_or_cap(inode)) |
1da177e4 | 99 | return -EPERM; |
42a74f20 DH |
100 | 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 | } | |
1da177e4 LT |
107 | inode->i_ctime = CURRENT_TIME_SEC; |
108 | mark_inode_dirty(inode); | |
42a74f20 DH |
109 | setversion_out: |
110 | mnt_drop_write(filp->f_path.mnt); | |
111 | return err; | |
1da177e4 LT |
112 | default: |
113 | return -ENOTTY; | |
114 | } | |
115 | } | |
116 | ||
52b499c4 DH |
117 | #ifdef CONFIG_COMPAT |
118 | long reiserfs_compat_ioctl(struct file *file, unsigned int cmd, | |
119 | unsigned long arg) | |
120 | { | |
1fc5adbd | 121 | struct inode *inode = file->f_path.dentry->d_inode; |
52b499c4 DH |
122 | 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 | ||
ba9d8cec VS |
151 | int reiserfs_commit_write(struct file *f, struct page *page, |
152 | unsigned from, unsigned to); | |
153 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
154 | unsigned from, unsigned to); | |
1da177e4 LT |
155 | /* |
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 | */ | |
d5dee5c3 | 160 | int reiserfs_unpack(struct inode *inode, struct file *filp) |
1da177e4 | 161 | { |
bd4c625c LT |
162 | 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; | |
168 | ||
169 | 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 | } | |
bd4c625c LT |
177 | |
178 | /* we need to make sure nobody is changing the file size beneath | |
179 | ** us | |
180 | */ | |
1b1dcc1b | 181 | mutex_lock(&inode->i_mutex); |
b5f3953c | 182 | reiserfs_write_lock(inode->i_sb); |
bd4c625c LT |
183 | |
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 | } | |
ba9d8cec | 202 | retval = reiserfs_prepare_write(NULL, page, write_from, write_from); |
bd4c625c LT |
203 | if (retval) |
204 | goto out_unlock; | |
205 | ||
206 | /* conversion can change page contents, must flush */ | |
207 | flush_dcache_page(page); | |
ba9d8cec | 208 | retval = reiserfs_commit_write(NULL, page, write_from, write_from); |
1da177e4 | 209 | REISERFS_I(inode)->i_flags |= i_nopack_mask; |
bd4c625c LT |
210 | |
211 | out_unlock: | |
212 | unlock_page(page); | |
213 | page_cache_release(page); | |
214 | ||
215 | out: | |
1b1dcc1b | 216 | mutex_unlock(&inode->i_mutex); |
bd4c625c LT |
217 | reiserfs_write_unlock(inode->i_sb); |
218 | return retval; | |
1da177e4 | 219 | } |