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Linux/fs/reiserfs/ioctl.c

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  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 <asm/uaccess.h>
 11 #include <linux/pagemap.h>
 12 #include <linux/compat.h>
 13 
 14 /*
 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  */
 22 long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 23 {
 24         struct inode *inode = file_inode(filp);
 25         unsigned int flags;
 26         int err = 0;
 27 
 28         reiserfs_write_lock(inode->i_sb);
 29 
 30         switch (cmd) {
 31         case REISERFS_IOC_UNPACK:
 32                 if (S_ISREG(inode->i_mode)) {
 33                         if (arg)
 34                                 err = reiserfs_unpack(inode, filp);
 35                 } else
 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                  */
 42         case REISERFS_IOC_GETFLAGS:
 43                 if (!reiserfs_attrs(inode->i_sb)) {
 44                         err = -ENOTTY;
 45                         break;
 46                 }
 47 
 48                 flags = REISERFS_I(inode)->i_attrs;
 49                 i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
 50                 err = put_user(flags, (int __user *)arg);
 51                 break;
 52         case REISERFS_IOC_SETFLAGS:{
 53                         if (!reiserfs_attrs(inode->i_sb)) {
 54                                 err = -ENOTTY;
 55                                 break;
 56                         }
 57 
 58                         err = mnt_want_write_file(filp);
 59                         if (err)
 60                                 break;
 61 
 62                         if (!inode_owner_or_capable(inode)) {
 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                         }
 77                         if (((flags ^ REISERFS_I(inode)->
 78                               i_attrs) & (REISERFS_IMMUTABLE_FL |
 79                                           REISERFS_APPEND_FL))
 80                             && !capable(CAP_LINUX_IMMUTABLE)) {
 81                                 err = -EPERM;
 82                                 goto setflags_out;
 83                         }
 84                         if ((flags & REISERFS_NOTAIL_FL) &&
 85                             S_ISREG(inode->i_mode)) {
 86                                 int result;
 87 
 88                                 result = reiserfs_unpack(inode, filp);
 89                                 if (result) {
 90                                         err = result;
 91                                         goto setflags_out;
 92                                 }
 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);
 98 setflags_out:
 99                         mnt_drop_write_file(filp);
100                         break;
101                 }
102         case REISERFS_IOC_GETVERSION:
103                 err = put_user(inode->i_generation, (int __user *)arg);
104                 break;
105         case REISERFS_IOC_SETVERSION:
106                 if (!inode_owner_or_capable(inode)) {
107                         err = -EPERM;
108                         break;
109                 }
110                 err = mnt_want_write_file(filp);
111                 if (err)
112                         break;
113                 if (get_user(inode->i_generation, (int __user *)arg)) {
114                         err = -EFAULT;
115                         goto setversion_out;
116                 }
117                 inode->i_ctime = CURRENT_TIME_SEC;
118                 mark_inode_dirty(inode);
119 setversion_out:
120                 mnt_drop_write_file(filp);
121                 break;
122         default:
123                 err = -ENOTTY;
124         }
125 
126         reiserfs_write_unlock(inode->i_sb);
127 
128         return err;
129 }
130 
131 #ifdef CONFIG_COMPAT
132 long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
133                                 unsigned long arg)
134 {
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         }
155 
156         return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
157 }
158 #endif
159 
160 int reiserfs_commit_write(struct file *f, struct page *page,
161                           unsigned from, unsigned to);
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 */
167 int reiserfs_unpack(struct inode *inode, struct file *filp)
168 {
169         int retval = 0;
170         int index;
171         struct page *page;
172         struct address_space *mapping;
173         unsigned long write_from;
174         unsigned long blocksize = inode->i_sb->s_blocksize;
175 
176         if (inode->i_size == 0) {
177                 REISERFS_I(inode)->i_flags |= i_nopack_mask;
178                 return 0;
179         }
180         /* ioctl already done */
181         if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
182                 return 0;
183         }
184 
185         /* we need to make sure nobody is changing the file size beneath us */
186         reiserfs_mutex_lock_safe(&inode->i_mutex, inode->i_sb);
187 
188         reiserfs_write_lock(inode->i_sb);
189 
190         write_from = inode->i_size & (blocksize - 1);
191         /* if we are on a block boundary, we are already unpacked.  */
192         if (write_from == 0) {
193                 REISERFS_I(inode)->i_flags |= i_nopack_mask;
194                 goto out;
195         }
196 
197         /* we unpack by finding the page with the tail, and calling
198          ** __reiserfs_write_begin on that page.  This will force a
199          ** reiserfs_get_block to unpack the tail for us.
200          */
201         index = inode->i_size >> PAGE_CACHE_SHIFT;
202         mapping = inode->i_mapping;
203         page = grab_cache_page(mapping, index);
204         retval = -ENOMEM;
205         if (!page) {
206                 goto out;
207         }
208         retval = __reiserfs_write_begin(page, write_from, 0);
209         if (retval)
210                 goto out_unlock;
211 
212         /* conversion can change page contents, must flush */
213         flush_dcache_page(page);
214         retval = reiserfs_commit_write(NULL, page, write_from, write_from);
215         REISERFS_I(inode)->i_flags |= i_nopack_mask;
216 
217       out_unlock:
218         unlock_page(page);
219         page_cache_release(page);
220 
221       out:
222         mutex_unlock(&inode->i_mutex);
223         reiserfs_write_unlock(inode->i_sb);
224         return retval;
225 }
226 

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