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 | 15 | /* |
ac78a078 FW |
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 | */ | |
205cb37b | 23 | long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 24 | { |
205cb37b | 25 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 | 26 | unsigned int flags; |
42a74f20 | 27 | int err = 0; |
1da177e4 | 28 | |
ac78a078 FW |
29 | reiserfs_write_lock(inode->i_sb); |
30 | ||
1da177e4 | 31 | switch (cmd) { |
bd4c625c LT |
32 | case REISERFS_IOC_UNPACK: |
33 | if (S_ISREG(inode->i_mode)) { | |
34 | if (arg) | |
ac78a078 | 35 | err = reiserfs_unpack(inode, filp); |
1da177e4 | 36 | } else |
ac78a078 FW |
37 | err = -ENOTTY; |
38 | break; | |
39 | /* | |
40 | * following two cases are taken from fs/ext2/ioctl.c by Remy | |
41 | * Card (card@masi.ibp.fr) | |
42 | */ | |
1da177e4 | 43 | case REISERFS_IOC_GETFLAGS: |
ac78a078 FW |
44 | if (!reiserfs_attrs(inode->i_sb)) { |
45 | err = -ENOTTY; | |
46 | break; | |
47 | } | |
869eb76e | 48 | |
bd4c625c LT |
49 | flags = REISERFS_I(inode)->i_attrs; |
50 | i_attrs_to_sd_attrs(inode, (__u16 *) & flags); | |
ac78a078 FW |
51 | err = put_user(flags, (int __user *)arg); |
52 | break; | |
bd4c625c | 53 | case REISERFS_IOC_SETFLAGS:{ |
ac78a078 FW |
54 | if (!reiserfs_attrs(inode->i_sb)) { |
55 | err = -ENOTTY; | |
56 | break; | |
57 | } | |
869eb76e | 58 | |
42a74f20 DH |
59 | err = mnt_want_write(filp->f_path.mnt); |
60 | if (err) | |
ac78a078 | 61 | break; |
1da177e4 | 62 | |
42a74f20 DH |
63 | if (!is_owner_or_cap(inode)) { |
64 | err = -EPERM; | |
65 | goto setflags_out; | |
66 | } | |
67 | if (get_user(flags, (int __user *)arg)) { | |
68 | err = -EFAULT; | |
69 | goto setflags_out; | |
70 | } | |
71 | /* | |
72 | * Is it quota file? Do not allow user to mess with it | |
73 | */ | |
74 | if (IS_NOQUOTA(inode)) { | |
75 | err = -EPERM; | |
76 | goto setflags_out; | |
77 | } | |
bd4c625c LT |
78 | if (((flags ^ REISERFS_I(inode)-> |
79 | i_attrs) & (REISERFS_IMMUTABLE_FL | | |
80 | REISERFS_APPEND_FL)) | |
42a74f20 DH |
81 | && !capable(CAP_LINUX_IMMUTABLE)) { |
82 | err = -EPERM; | |
83 | goto setflags_out; | |
84 | } | |
bd4c625c LT |
85 | if ((flags & REISERFS_NOTAIL_FL) && |
86 | S_ISREG(inode->i_mode)) { | |
1da177e4 LT |
87 | int result; |
88 | ||
bd4c625c | 89 | result = reiserfs_unpack(inode, filp); |
42a74f20 DH |
90 | if (result) { |
91 | err = result; | |
92 | goto setflags_out; | |
93 | } | |
bd4c625c LT |
94 | } |
95 | sd_attrs_to_i_attrs(flags, inode); | |
96 | REISERFS_I(inode)->i_attrs = flags; | |
97 | inode->i_ctime = CURRENT_TIME_SEC; | |
98 | mark_inode_dirty(inode); | |
42a74f20 DH |
99 | setflags_out: |
100 | mnt_drop_write(filp->f_path.mnt); | |
ac78a078 | 101 | break; |
1da177e4 | 102 | } |
1da177e4 | 103 | case REISERFS_IOC_GETVERSION: |
ac78a078 FW |
104 | err = put_user(inode->i_generation, (int __user *)arg); |
105 | break; | |
1da177e4 | 106 | case REISERFS_IOC_SETVERSION: |
e0baec1b | 107 | if (!is_owner_or_cap(inode)) { |
ac78a078 FW |
108 | err = -EPERM; |
109 | break; | |
e0baec1b | 110 | } |
42a74f20 DH |
111 | err = mnt_want_write(filp->f_path.mnt); |
112 | if (err) | |
ac78a078 | 113 | break; |
42a74f20 DH |
114 | if (get_user(inode->i_generation, (int __user *)arg)) { |
115 | err = -EFAULT; | |
116 | goto setversion_out; | |
117 | } | |
1da177e4 LT |
118 | inode->i_ctime = CURRENT_TIME_SEC; |
119 | mark_inode_dirty(inode); | |
42a74f20 DH |
120 | setversion_out: |
121 | mnt_drop_write(filp->f_path.mnt); | |
ac78a078 | 122 | break; |
1da177e4 | 123 | default: |
ac78a078 | 124 | err = -ENOTTY; |
1da177e4 | 125 | } |
ac78a078 FW |
126 | |
127 | reiserfs_write_unlock(inode->i_sb); | |
128 | ||
129 | return err; | |
1da177e4 LT |
130 | } |
131 | ||
52b499c4 DH |
132 | #ifdef CONFIG_COMPAT |
133 | long reiserfs_compat_ioctl(struct file *file, unsigned int cmd, | |
134 | unsigned long arg) | |
135 | { | |
52b499c4 DH |
136 | /* These are just misnamed, they actually get/put from/to user an int */ |
137 | switch (cmd) { | |
138 | case REISERFS_IOC32_UNPACK: | |
139 | cmd = REISERFS_IOC_UNPACK; | |
140 | break; | |
141 | case REISERFS_IOC32_GETFLAGS: | |
142 | cmd = REISERFS_IOC_GETFLAGS; | |
143 | break; | |
144 | case REISERFS_IOC32_SETFLAGS: | |
145 | cmd = REISERFS_IOC_SETFLAGS; | |
146 | break; | |
147 | case REISERFS_IOC32_GETVERSION: | |
148 | cmd = REISERFS_IOC_GETVERSION; | |
149 | break; | |
150 | case REISERFS_IOC32_SETVERSION: | |
151 | cmd = REISERFS_IOC_SETVERSION; | |
152 | break; | |
153 | default: | |
154 | return -ENOIOCTLCMD; | |
155 | } | |
8ebc4232 | 156 | |
205cb37b | 157 | return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
52b499c4 DH |
158 | } |
159 | #endif | |
160 | ||
ba9d8cec VS |
161 | int reiserfs_commit_write(struct file *f, struct page *page, |
162 | unsigned from, unsigned to); | |
163 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
164 | unsigned from, unsigned to); | |
1da177e4 LT |
165 | /* |
166 | ** reiserfs_unpack | |
167 | ** Function try to convert tail from direct item into indirect. | |
168 | ** It set up nopack attribute in the REISERFS_I(inode)->nopack | |
169 | */ | |
d5dee5c3 | 170 | int reiserfs_unpack(struct inode *inode, struct file *filp) |
1da177e4 | 171 | { |
bd4c625c LT |
172 | int retval = 0; |
173 | int index; | |
174 | struct page *page; | |
175 | struct address_space *mapping; | |
176 | unsigned long write_from; | |
177 | unsigned long blocksize = inode->i_sb->s_blocksize; | |
178 | ||
179 | if (inode->i_size == 0) { | |
180 | REISERFS_I(inode)->i_flags |= i_nopack_mask; | |
181 | return 0; | |
182 | } | |
183 | /* ioctl already done */ | |
184 | if (REISERFS_I(inode)->i_flags & i_nopack_mask) { | |
185 | return 0; | |
186 | } | |
bd4c625c LT |
187 | |
188 | /* we need to make sure nobody is changing the file size beneath | |
189 | ** us | |
190 | */ | |
1b1dcc1b | 191 | mutex_lock(&inode->i_mutex); |
b5f3953c | 192 | reiserfs_write_lock(inode->i_sb); |
bd4c625c LT |
193 | |
194 | write_from = inode->i_size & (blocksize - 1); | |
195 | /* if we are on a block boundary, we are already unpacked. */ | |
196 | if (write_from == 0) { | |
197 | REISERFS_I(inode)->i_flags |= i_nopack_mask; | |
198 | goto out; | |
199 | } | |
200 | ||
201 | /* we unpack by finding the page with the tail, and calling | |
0222e657 | 202 | ** reiserfs_prepare_write on that page. This will force a |
bd4c625c LT |
203 | ** reiserfs_get_block to unpack the tail for us. |
204 | */ | |
205 | index = inode->i_size >> PAGE_CACHE_SHIFT; | |
206 | mapping = inode->i_mapping; | |
207 | page = grab_cache_page(mapping, index); | |
208 | retval = -ENOMEM; | |
209 | if (!page) { | |
210 | goto out; | |
211 | } | |
ba9d8cec | 212 | retval = reiserfs_prepare_write(NULL, page, write_from, write_from); |
bd4c625c LT |
213 | if (retval) |
214 | goto out_unlock; | |
215 | ||
216 | /* conversion can change page contents, must flush */ | |
217 | flush_dcache_page(page); | |
ba9d8cec | 218 | retval = reiserfs_commit_write(NULL, page, write_from, write_from); |
1da177e4 | 219 | REISERFS_I(inode)->i_flags |= i_nopack_mask; |
bd4c625c LT |
220 | |
221 | out_unlock: | |
222 | unlock_page(page); | |
223 | page_cache_release(page); | |
224 | ||
225 | out: | |
1b1dcc1b | 226 | mutex_unlock(&inode->i_mutex); |
bd4c625c LT |
227 | reiserfs_write_unlock(inode->i_sb); |
228 | return retval; | |
1da177e4 | 229 | } |