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
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 ...
23 int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
30 case REISERFS_IOC_UNPACK:
31 if (S_ISREG(inode->i_mode)) {
33 return reiserfs_unpack(inode, filp);
38 /* following two cases are taken from fs/ext2/ioctl.c by Remy
39 Card (card@masi.ibp.fr) */
40 case REISERFS_IOC_GETFLAGS:
41 if (!reiserfs_attrs(inode->i_sb))
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))
51 err = mnt_want_write(filp->f_path.mnt);
55 if (!is_owner_or_cap(inode)) {
59 if (get_user(flags, (int __user *)arg)) {
64 * Is it quota file? Do not allow user to mess with it
66 if (IS_NOQUOTA(inode)) {
70 if (((flags ^ REISERFS_I(inode)->
71 i_attrs) & (REISERFS_IMMUTABLE_FL |
73 && !capable(CAP_LINUX_IMMUTABLE)) {
77 if ((flags & REISERFS_NOTAIL_FL) &&
78 S_ISREG(inode->i_mode)) {
81 result = reiserfs_unpack(inode, filp);
87 sd_attrs_to_i_attrs(flags, inode);
88 REISERFS_I(inode)->i_attrs = flags;
89 inode->i_ctime = CURRENT_TIME_SEC;
90 mark_inode_dirty(inode);
92 mnt_drop_write(filp->f_path.mnt);
95 case REISERFS_IOC_GETVERSION:
96 return put_user(inode->i_generation, (int __user *)arg);
97 case REISERFS_IOC_SETVERSION:
98 if (!is_owner_or_cap(inode))
100 err = mnt_want_write(filp->f_path.mnt);
103 if (get_user(inode->i_generation, (int __user *)arg)) {
107 inode->i_ctime = CURRENT_TIME_SEC;
108 mark_inode_dirty(inode);
110 mnt_drop_write(filp->f_path.mnt);
118 long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
121 struct inode *inode = file->f_path.dentry->d_inode;
124 /* These are just misnamed, they actually get/put from/to user an int */
126 case REISERFS_IOC32_UNPACK:
127 cmd = REISERFS_IOC_UNPACK;
129 case REISERFS_IOC32_GETFLAGS:
130 cmd = REISERFS_IOC_GETFLAGS;
132 case REISERFS_IOC32_SETFLAGS:
133 cmd = REISERFS_IOC_SETFLAGS;
135 case REISERFS_IOC32_GETVERSION:
136 cmd = REISERFS_IOC_GETVERSION;
138 case REISERFS_IOC32_SETVERSION:
139 cmd = REISERFS_IOC_SETVERSION;
145 ret = reiserfs_ioctl(inode, file, cmd, (unsigned long) compat_ptr(arg));
151 int reiserfs_commit_write(struct file *f, struct page *page,
152 unsigned from, unsigned to);
153 int reiserfs_prepare_write(struct file *f, struct page *page,
154 unsigned from, unsigned to);
157 ** Function try to convert tail from direct item into indirect.
158 ** It set up nopack attribute in the REISERFS_I(inode)->nopack
160 int reiserfs_unpack(struct inode *inode, struct file *filp)
165 struct address_space *mapping;
166 unsigned long write_from;
167 unsigned long blocksize = inode->i_sb->s_blocksize;
169 if (inode->i_size == 0) {
170 REISERFS_I(inode)->i_flags |= i_nopack_mask;
173 /* ioctl already done */
174 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
178 /* we need to make sure nobody is changing the file size beneath
181 mutex_lock(&inode->i_mutex);
182 reiserfs_write_lock(inode->i_sb);
184 write_from = inode->i_size & (blocksize - 1);
185 /* if we are on a block boundary, we are already unpacked. */
186 if (write_from == 0) {
187 REISERFS_I(inode)->i_flags |= i_nopack_mask;
191 /* we unpack by finding the page with the tail, and calling
192 ** reiserfs_prepare_write on that page. This will force a
193 ** reiserfs_get_block to unpack the tail for us.
195 index = inode->i_size >> PAGE_CACHE_SHIFT;
196 mapping = inode->i_mapping;
197 page = grab_cache_page(mapping, index);
202 retval = reiserfs_prepare_write(NULL, page, write_from, write_from);
206 /* conversion can change page contents, must flush */
207 flush_dcache_page(page);
208 retval = reiserfs_commit_write(NULL, page, write_from, write_from);
209 REISERFS_I(inode)->i_flags |= i_nopack_mask;
213 page_cache_release(page);
216 mutex_unlock(&inode->i_mutex);
217 reiserfs_write_unlock(inode->i_sb);