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> |
f466c6fd | 8 | #include "reiserfs.h" |
1da177e4 LT |
9 | #include <linux/time.h> |
10 | #include <asm/uaccess.h> | |
11 | #include <linux/pagemap.h> | |
52b499c4 | 12 | #include <linux/compat.h> |
1da177e4 | 13 | |
1da177e4 | 14 | /* |
ac78a078 FW |
15 | * reiserfs_ioctl - handler for ioctl for inode |
16 | * supported commands: | |
17 | * 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect | |
18 | * and prevent packing file (argument arg has to be non-zero) | |
19 | * 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION | |
20 | * 3) That's all for a while ... | |
21 | */ | |
205cb37b | 22 | long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
1da177e4 | 23 | { |
205cb37b | 24 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 | 25 | unsigned int flags; |
42a74f20 | 26 | int err = 0; |
1da177e4 | 27 | |
ac78a078 FW |
28 | reiserfs_write_lock(inode->i_sb); |
29 | ||
1da177e4 | 30 | switch (cmd) { |
bd4c625c LT |
31 | case REISERFS_IOC_UNPACK: |
32 | if (S_ISREG(inode->i_mode)) { | |
33 | if (arg) | |
ac78a078 | 34 | err = reiserfs_unpack(inode, filp); |
1da177e4 | 35 | } else |
ac78a078 FW |
36 | err = -ENOTTY; |
37 | break; | |
38 | /* | |
39 | * following two cases are taken from fs/ext2/ioctl.c by Remy | |
40 | * Card (card@masi.ibp.fr) | |
41 | */ | |
1da177e4 | 42 | case REISERFS_IOC_GETFLAGS: |
ac78a078 FW |
43 | if (!reiserfs_attrs(inode->i_sb)) { |
44 | err = -ENOTTY; | |
45 | break; | |
46 | } | |
869eb76e | 47 | |
bd4c625c LT |
48 | flags = REISERFS_I(inode)->i_attrs; |
49 | i_attrs_to_sd_attrs(inode, (__u16 *) & flags); | |
ac78a078 FW |
50 | err = put_user(flags, (int __user *)arg); |
51 | break; | |
bd4c625c | 52 | case REISERFS_IOC_SETFLAGS:{ |
ac78a078 FW |
53 | if (!reiserfs_attrs(inode->i_sb)) { |
54 | err = -ENOTTY; | |
55 | break; | |
56 | } | |
869eb76e | 57 | |
a561be71 | 58 | err = mnt_want_write_file(filp); |
42a74f20 | 59 | if (err) |
ac78a078 | 60 | break; |
1da177e4 | 61 | |
2e149670 | 62 | if (!inode_owner_or_capable(inode)) { |
42a74f20 DH |
63 | err = -EPERM; |
64 | goto setflags_out; | |
65 | } | |
66 | if (get_user(flags, (int __user *)arg)) { | |
67 | err = -EFAULT; | |
68 | goto setflags_out; | |
69 | } | |
70 | /* | |
71 | * Is it quota file? Do not allow user to mess with it | |
72 | */ | |
73 | if (IS_NOQUOTA(inode)) { | |
74 | err = -EPERM; | |
75 | goto setflags_out; | |
76 | } | |
bd4c625c LT |
77 | if (((flags ^ REISERFS_I(inode)-> |
78 | i_attrs) & (REISERFS_IMMUTABLE_FL | | |
79 | REISERFS_APPEND_FL)) | |
42a74f20 DH |
80 | && !capable(CAP_LINUX_IMMUTABLE)) { |
81 | err = -EPERM; | |
82 | goto setflags_out; | |
83 | } | |
bd4c625c LT |
84 | if ((flags & REISERFS_NOTAIL_FL) && |
85 | S_ISREG(inode->i_mode)) { | |
1da177e4 LT |
86 | int result; |
87 | ||
bd4c625c | 88 | result = reiserfs_unpack(inode, filp); |
42a74f20 DH |
89 | if (result) { |
90 | err = result; | |
91 | goto setflags_out; | |
92 | } | |
bd4c625c LT |
93 | } |
94 | sd_attrs_to_i_attrs(flags, inode); | |
95 | REISERFS_I(inode)->i_attrs = flags; | |
96 | inode->i_ctime = CURRENT_TIME_SEC; | |
97 | mark_inode_dirty(inode); | |
42a74f20 | 98 | setflags_out: |
2a79f17e | 99 | mnt_drop_write_file(filp); |
ac78a078 | 100 | break; |
1da177e4 | 101 | } |
1da177e4 | 102 | case REISERFS_IOC_GETVERSION: |
ac78a078 FW |
103 | err = put_user(inode->i_generation, (int __user *)arg); |
104 | break; | |
1da177e4 | 105 | case REISERFS_IOC_SETVERSION: |
2e149670 | 106 | if (!inode_owner_or_capable(inode)) { |
ac78a078 FW |
107 | err = -EPERM; |
108 | break; | |
e0baec1b | 109 | } |
a561be71 | 110 | err = mnt_want_write_file(filp); |
42a74f20 | 111 | if (err) |
ac78a078 | 112 | break; |
42a74f20 DH |
113 | if (get_user(inode->i_generation, (int __user *)arg)) { |
114 | err = -EFAULT; | |
115 | goto setversion_out; | |
116 | } | |
1da177e4 LT |
117 | inode->i_ctime = CURRENT_TIME_SEC; |
118 | mark_inode_dirty(inode); | |
42a74f20 | 119 | setversion_out: |
2a79f17e | 120 | mnt_drop_write_file(filp); |
ac78a078 | 121 | break; |
1da177e4 | 122 | default: |
ac78a078 | 123 | err = -ENOTTY; |
1da177e4 | 124 | } |
ac78a078 FW |
125 | |
126 | reiserfs_write_unlock(inode->i_sb); | |
127 | ||
128 | return err; | |
1da177e4 LT |
129 | } |
130 | ||
52b499c4 DH |
131 | #ifdef CONFIG_COMPAT |
132 | long reiserfs_compat_ioctl(struct file *file, unsigned int cmd, | |
133 | unsigned long arg) | |
134 | { | |
52b499c4 DH |
135 | /* These are just misnamed, they actually get/put from/to user an int */ |
136 | switch (cmd) { | |
137 | case REISERFS_IOC32_UNPACK: | |
138 | cmd = REISERFS_IOC_UNPACK; | |
139 | break; | |
140 | case REISERFS_IOC32_GETFLAGS: | |
141 | cmd = REISERFS_IOC_GETFLAGS; | |
142 | break; | |
143 | case REISERFS_IOC32_SETFLAGS: | |
144 | cmd = REISERFS_IOC_SETFLAGS; | |
145 | break; | |
146 | case REISERFS_IOC32_GETVERSION: | |
147 | cmd = REISERFS_IOC_GETVERSION; | |
148 | break; | |
149 | case REISERFS_IOC32_SETVERSION: | |
150 | cmd = REISERFS_IOC_SETVERSION; | |
151 | break; | |
152 | default: | |
153 | return -ENOIOCTLCMD; | |
154 | } | |
8ebc4232 | 155 | |
205cb37b | 156 | return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg)); |
52b499c4 DH |
157 | } |
158 | #endif | |
159 | ||
ba9d8cec VS |
160 | int reiserfs_commit_write(struct file *f, struct page *page, |
161 | unsigned from, unsigned to); | |
1da177e4 LT |
162 | /* |
163 | ** reiserfs_unpack | |
164 | ** Function try to convert tail from direct item into indirect. | |
165 | ** It set up nopack attribute in the REISERFS_I(inode)->nopack | |
166 | */ | |
d5dee5c3 | 167 | int reiserfs_unpack(struct inode *inode, struct file *filp) |
1da177e4 | 168 | { |
bd4c625c | 169 | int retval = 0; |
9d8117e7 | 170 | int depth; |
bd4c625c LT |
171 | int index; |
172 | struct page *page; | |
173 | struct address_space *mapping; | |
174 | unsigned long write_from; | |
175 | unsigned long blocksize = inode->i_sb->s_blocksize; | |
176 | ||
177 | if (inode->i_size == 0) { | |
178 | REISERFS_I(inode)->i_flags |= i_nopack_mask; | |
179 | return 0; | |
180 | } | |
181 | /* ioctl already done */ | |
182 | if (REISERFS_I(inode)->i_flags & i_nopack_mask) { | |
183 | return 0; | |
184 | } | |
bd4c625c | 185 | |
9d8117e7 | 186 | depth = reiserfs_write_lock_once(inode->i_sb); |
bd4c625c | 187 | |
da905873 FW |
188 | /* we need to make sure nobody is changing the file size beneath us */ |
189 | reiserfs_mutex_lock_safe(&inode->i_mutex, inode->i_sb); | |
190 | ||
bd4c625c LT |
191 | write_from = inode->i_size & (blocksize - 1); |
192 | /* if we are on a block boundary, we are already unpacked. */ | |
193 | if (write_from == 0) { | |
194 | REISERFS_I(inode)->i_flags |= i_nopack_mask; | |
195 | goto out; | |
196 | } | |
197 | ||
198 | /* we unpack by finding the page with the tail, and calling | |
ebdec241 | 199 | ** __reiserfs_write_begin on that page. This will force a |
bd4c625c LT |
200 | ** reiserfs_get_block to unpack the tail for us. |
201 | */ | |
202 | index = inode->i_size >> PAGE_CACHE_SHIFT; | |
203 | mapping = inode->i_mapping; | |
204 | page = grab_cache_page(mapping, index); | |
205 | retval = -ENOMEM; | |
206 | if (!page) { | |
207 | goto out; | |
208 | } | |
ebdec241 | 209 | retval = __reiserfs_write_begin(page, write_from, 0); |
bd4c625c LT |
210 | if (retval) |
211 | goto out_unlock; | |
212 | ||
213 | /* conversion can change page contents, must flush */ | |
214 | flush_dcache_page(page); | |
ba9d8cec | 215 | retval = reiserfs_commit_write(NULL, page, write_from, write_from); |
1da177e4 | 216 | REISERFS_I(inode)->i_flags |= i_nopack_mask; |
bd4c625c LT |
217 | |
218 | out_unlock: | |
219 | unlock_page(page); | |
220 | page_cache_release(page); | |
221 | ||
222 | out: | |
1b1dcc1b | 223 | mutex_unlock(&inode->i_mutex); |
9d8117e7 | 224 | reiserfs_write_unlock_once(inode->i_sb, depth); |
bd4c625c | 225 | return retval; |
1da177e4 | 226 | } |