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