2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
5 #include <linux/capability.h>
7 #include <linux/mount.h>
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>
13 #include <linux/compat.h>
16 * reiserfs_ioctl - handler for ioctl for inode
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 ...
23 int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
29 reiserfs_write_lock(inode->i_sb);
32 case REISERFS_IOC_UNPACK:
33 if (S_ISREG(inode->i_mode)) {
35 err = reiserfs_unpack(inode, filp);
40 * following two cases are taken from fs/ext2/ioctl.c by Remy
41 * Card (card@masi.ibp.fr)
43 case REISERFS_IOC_GETFLAGS:
44 if (!reiserfs_attrs(inode->i_sb)) {
49 flags = REISERFS_I(inode)->i_attrs;
50 i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
51 err = put_user(flags, (int __user *)arg);
53 case REISERFS_IOC_SETFLAGS:{
54 if (!reiserfs_attrs(inode->i_sb)) {
59 err = mnt_want_write(filp->f_path.mnt);
63 if (!is_owner_or_cap(inode)) {
67 if (get_user(flags, (int __user *)arg)) {
72 * Is it quota file? Do not allow user to mess with it
74 if (IS_NOQUOTA(inode)) {
78 if (((flags ^ REISERFS_I(inode)->
79 i_attrs) & (REISERFS_IMMUTABLE_FL |
81 && !capable(CAP_LINUX_IMMUTABLE)) {
85 if ((flags & REISERFS_NOTAIL_FL) &&
86 S_ISREG(inode->i_mode)) {
89 result = reiserfs_unpack(inode, filp);
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);
100 mnt_drop_write(filp->f_path.mnt);
103 case REISERFS_IOC_GETVERSION:
104 err = put_user(inode->i_generation, (int __user *)arg);
106 case REISERFS_IOC_SETVERSION:
107 if (!is_owner_or_cap(inode))
110 err = mnt_want_write(filp->f_path.mnt);
113 if (get_user(inode->i_generation, (int __user *)arg)) {
117 inode->i_ctime = CURRENT_TIME_SEC;
118 mark_inode_dirty(inode);
120 mnt_drop_write(filp->f_path.mnt);
126 reiserfs_write_unlock(inode->i_sb);
132 long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
135 struct inode *inode = file->f_path.dentry->d_inode;
138 /* These are just misnamed, they actually get/put from/to user an int */
140 case REISERFS_IOC32_UNPACK:
141 cmd = REISERFS_IOC_UNPACK;
143 case REISERFS_IOC32_GETFLAGS:
144 cmd = REISERFS_IOC_GETFLAGS;
146 case REISERFS_IOC32_SETFLAGS:
147 cmd = REISERFS_IOC_SETFLAGS;
149 case REISERFS_IOC32_GETVERSION:
150 cmd = REISERFS_IOC_GETVERSION;
152 case REISERFS_IOC32_SETVERSION:
153 cmd = REISERFS_IOC_SETVERSION;
159 ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
165 int reiserfs_commit_write(struct file *f, struct page *page,
166 unsigned from, unsigned to);
167 int reiserfs_prepare_write(struct file *f, struct page *page,
168 unsigned from, unsigned to);
171 ** Function try to convert tail from direct item into indirect.
172 ** It set up nopack attribute in the REISERFS_I(inode)->nopack
174 int reiserfs_unpack(struct inode *inode, struct file *filp)
179 struct address_space *mapping;
180 unsigned long write_from;
181 unsigned long blocksize = inode->i_sb->s_blocksize;
183 if (inode->i_size == 0) {
184 REISERFS_I(inode)->i_flags |= i_nopack_mask;
187 /* ioctl already done */
188 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
192 /* we need to make sure nobody is changing the file size beneath
195 mutex_lock(&inode->i_mutex);
196 reiserfs_write_lock(inode->i_sb);
198 write_from = inode->i_size & (blocksize - 1);
199 /* if we are on a block boundary, we are already unpacked. */
200 if (write_from == 0) {
201 REISERFS_I(inode)->i_flags |= i_nopack_mask;
205 /* we unpack by finding the page with the tail, and calling
206 ** reiserfs_prepare_write on that page. This will force a
207 ** reiserfs_get_block to unpack the tail for us.
209 index = inode->i_size >> PAGE_CACHE_SHIFT;
210 mapping = inode->i_mapping;
211 page = grab_cache_page(mapping, index);
216 retval = reiserfs_prepare_write(NULL, page, write_from, write_from);
220 /* conversion can change page contents, must flush */
221 flush_dcache_page(page);
222 retval = reiserfs_commit_write(NULL, page, write_from, write_from);
223 REISERFS_I(inode)->i_flags |= i_nopack_mask;
227 page_cache_release(page);
230 mutex_unlock(&inode->i_mutex);
231 reiserfs_write_unlock(inode->i_sb);