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Commit | Line | Data |
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1da177e4 LT |
1 | /* |
2 | * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README | |
3 | */ | |
4 | ||
16f7e0fe | 5 | #include <linux/capability.h> |
1da177e4 LT |
6 | #include <linux/fs.h> |
7 | #include <linux/reiserfs_fs.h> | |
8 | #include <linux/time.h> | |
9 | #include <asm/uaccess.h> | |
10 | #include <linux/pagemap.h> | |
11 | #include <linux/smp_lock.h> | |
52b499c4 | 12 | #include <linux/compat.h> |
1da177e4 | 13 | |
bd4c625c | 14 | static int reiserfs_unpack(struct inode *inode, struct file *filp); |
1da177e4 LT |
15 | |
16 | /* | |
17 | ** reiserfs_ioctl - handler for ioctl for inode | |
18 | ** supported commands: | |
19 | ** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect | |
20 | ** and prevent packing file (argument arg has to be non-zero) | |
21 | ** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION | |
22 | ** 3) That's all for a while ... | |
23 | */ | |
bd4c625c LT |
24 | int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd, |
25 | unsigned long arg) | |
1da177e4 LT |
26 | { |
27 | unsigned int flags; | |
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 | |
bd4c625c LT |
51 | if (IS_RDONLY(inode)) |
52 | return -EROFS; | |
1da177e4 | 53 | |
3bd858ab | 54 | if (!is_owner_or_cap(inode)) |
bd4c625c | 55 | return -EPERM; |
1da177e4 | 56 | |
bd4c625c LT |
57 | if (get_user(flags, (int __user *)arg)) |
58 | return -EFAULT; | |
1da177e4 | 59 | |
bd4c625c LT |
60 | if (((flags ^ REISERFS_I(inode)-> |
61 | i_attrs) & (REISERFS_IMMUTABLE_FL | | |
62 | REISERFS_APPEND_FL)) | |
63 | && !capable(CAP_LINUX_IMMUTABLE)) | |
64 | return -EPERM; | |
65 | ||
66 | if ((flags & REISERFS_NOTAIL_FL) && | |
67 | S_ISREG(inode->i_mode)) { | |
1da177e4 LT |
68 | int result; |
69 | ||
bd4c625c LT |
70 | result = reiserfs_unpack(inode, filp); |
71 | if (result) | |
1da177e4 | 72 | return result; |
bd4c625c LT |
73 | } |
74 | sd_attrs_to_i_attrs(flags, inode); | |
75 | REISERFS_I(inode)->i_attrs = flags; | |
76 | inode->i_ctime = CURRENT_TIME_SEC; | |
77 | mark_inode_dirty(inode); | |
78 | return 0; | |
1da177e4 | 79 | } |
1da177e4 | 80 | case REISERFS_IOC_GETVERSION: |
bd4c625c | 81 | return put_user(inode->i_generation, (int __user *)arg); |
1da177e4 | 82 | case REISERFS_IOC_SETVERSION: |
3bd858ab | 83 | if (!is_owner_or_cap(inode)) |
1da177e4 LT |
84 | return -EPERM; |
85 | if (IS_RDONLY(inode)) | |
86 | return -EROFS; | |
bd4c625c LT |
87 | if (get_user(inode->i_generation, (int __user *)arg)) |
88 | return -EFAULT; | |
1da177e4 LT |
89 | inode->i_ctime = CURRENT_TIME_SEC; |
90 | mark_inode_dirty(inode); | |
91 | return 0; | |
92 | default: | |
93 | return -ENOTTY; | |
94 | } | |
95 | } | |
96 | ||
52b499c4 DH |
97 | #ifdef CONFIG_COMPAT |
98 | long reiserfs_compat_ioctl(struct file *file, unsigned int cmd, | |
99 | unsigned long arg) | |
100 | { | |
1fc5adbd | 101 | struct inode *inode = file->f_path.dentry->d_inode; |
52b499c4 DH |
102 | int ret; |
103 | ||
104 | /* These are just misnamed, they actually get/put from/to user an int */ | |
105 | switch (cmd) { | |
106 | case REISERFS_IOC32_UNPACK: | |
107 | cmd = REISERFS_IOC_UNPACK; | |
108 | break; | |
109 | case REISERFS_IOC32_GETFLAGS: | |
110 | cmd = REISERFS_IOC_GETFLAGS; | |
111 | break; | |
112 | case REISERFS_IOC32_SETFLAGS: | |
113 | cmd = REISERFS_IOC_SETFLAGS; | |
114 | break; | |
115 | case REISERFS_IOC32_GETVERSION: | |
116 | cmd = REISERFS_IOC_GETVERSION; | |
117 | break; | |
118 | case REISERFS_IOC32_SETVERSION: | |
119 | cmd = REISERFS_IOC_SETVERSION; | |
120 | break; | |
121 | default: | |
122 | return -ENOIOCTLCMD; | |
123 | } | |
124 | lock_kernel(); | |
125 | ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg)); | |
126 | unlock_kernel(); | |
127 | return ret; | |
128 | } | |
129 | #endif | |
130 | ||
ba9d8cec VS |
131 | int reiserfs_commit_write(struct file *f, struct page *page, |
132 | unsigned from, unsigned to); | |
133 | int reiserfs_prepare_write(struct file *f, struct page *page, | |
134 | unsigned from, unsigned to); | |
1da177e4 LT |
135 | /* |
136 | ** reiserfs_unpack | |
137 | ** Function try to convert tail from direct item into indirect. | |
138 | ** It set up nopack attribute in the REISERFS_I(inode)->nopack | |
139 | */ | |
bd4c625c | 140 | static int reiserfs_unpack(struct inode *inode, struct file *filp) |
1da177e4 | 141 | { |
bd4c625c LT |
142 | int retval = 0; |
143 | int index; | |
144 | struct page *page; | |
145 | struct address_space *mapping; | |
146 | unsigned long write_from; | |
147 | unsigned long blocksize = inode->i_sb->s_blocksize; | |
148 | ||
149 | if (inode->i_size == 0) { | |
150 | REISERFS_I(inode)->i_flags |= i_nopack_mask; | |
151 | return 0; | |
152 | } | |
153 | /* ioctl already done */ | |
154 | if (REISERFS_I(inode)->i_flags & i_nopack_mask) { | |
155 | return 0; | |
156 | } | |
bd4c625c LT |
157 | |
158 | /* we need to make sure nobody is changing the file size beneath | |
159 | ** us | |
160 | */ | |
1b1dcc1b | 161 | mutex_lock(&inode->i_mutex); |
b5f3953c | 162 | reiserfs_write_lock(inode->i_sb); |
bd4c625c LT |
163 | |
164 | write_from = inode->i_size & (blocksize - 1); | |
165 | /* if we are on a block boundary, we are already unpacked. */ | |
166 | if (write_from == 0) { | |
167 | REISERFS_I(inode)->i_flags |= i_nopack_mask; | |
168 | goto out; | |
169 | } | |
170 | ||
171 | /* we unpack by finding the page with the tail, and calling | |
172 | ** reiserfs_prepare_write on that page. This will force a | |
173 | ** reiserfs_get_block to unpack the tail for us. | |
174 | */ | |
175 | index = inode->i_size >> PAGE_CACHE_SHIFT; | |
176 | mapping = inode->i_mapping; | |
177 | page = grab_cache_page(mapping, index); | |
178 | retval = -ENOMEM; | |
179 | if (!page) { | |
180 | goto out; | |
181 | } | |
ba9d8cec | 182 | retval = reiserfs_prepare_write(NULL, page, write_from, write_from); |
bd4c625c LT |
183 | if (retval) |
184 | goto out_unlock; | |
185 | ||
186 | /* conversion can change page contents, must flush */ | |
187 | flush_dcache_page(page); | |
ba9d8cec | 188 | retval = reiserfs_commit_write(NULL, page, write_from, write_from); |
1da177e4 | 189 | REISERFS_I(inode)->i_flags |= i_nopack_mask; |
bd4c625c LT |
190 | |
191 | out_unlock: | |
192 | unlock_page(page); | |
193 | page_cache_release(page); | |
194 | ||
195 | out: | |
1b1dcc1b | 196 | mutex_unlock(&inode->i_mutex); |
bd4c625c LT |
197 | reiserfs_write_unlock(inode->i_sb); |
198 | return retval; | |
1da177e4 | 199 | } |