blob: ba8bf8df6dc77743bfa690d526f2e90c09193b9b [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
3 */
4
5#include <linux/fs.h>
6#include <linux/reiserfs_fs.h>
7#include <linux/time.h>
8#include <asm/uaccess.h>
9#include <linux/pagemap.h>
10#include <linux/smp_lock.h>
11
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070012static int reiserfs_unpack(struct inode *inode, struct file *filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070013
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*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070022int reiserfs_ioctl(struct inode *inode, struct file *filp, unsigned int cmd,
23 unsigned long arg)
Linus Torvalds1da177e2005-04-16 15:20:36 -070024{
25 unsigned int flags;
26
27 switch (cmd) {
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070028 case REISERFS_IOC_UNPACK:
29 if (S_ISREG(inode->i_mode)) {
30 if (arg)
31 return reiserfs_unpack(inode, filp);
Linus Torvalds1da177e2005-04-16 15:20:36 -070032 else
33 return 0;
34 } else
35 return -ENOTTY;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070036 /* following two cases are taken from fs/ext2/ioctl.c by Remy
37 Card (card@masi.ibp.fr) */
Linus Torvalds1da177e2005-04-16 15:20:36 -070038 case REISERFS_IOC_GETFLAGS:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070039 if (!reiserfs_attrs(inode->i_sb))
Jeff Mahoney869eb762005-06-29 18:52:28 -040040 return -ENOTTY;
41
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070042 flags = REISERFS_I(inode)->i_attrs;
43 i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
44 return put_user(flags, (int __user *)arg);
45 case REISERFS_IOC_SETFLAGS:{
46 if (!reiserfs_attrs(inode->i_sb))
47 return -ENOTTY;
Jeff Mahoney869eb762005-06-29 18:52:28 -040048
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070049 if (IS_RDONLY(inode))
50 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070052 if ((current->fsuid != inode->i_uid)
53 && !capable(CAP_FOWNER))
54 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070056 if (get_user(flags, (int __user *)arg))
57 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070058
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070059 if (((flags ^ REISERFS_I(inode)->
60 i_attrs) & (REISERFS_IMMUTABLE_FL |
61 REISERFS_APPEND_FL))
62 && !capable(CAP_LINUX_IMMUTABLE))
63 return -EPERM;
64
65 if ((flags & REISERFS_NOTAIL_FL) &&
66 S_ISREG(inode->i_mode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 int result;
68
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070069 result = reiserfs_unpack(inode, filp);
70 if (result)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 return result;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070072 }
73 sd_attrs_to_i_attrs(flags, inode);
74 REISERFS_I(inode)->i_attrs = flags;
75 inode->i_ctime = CURRENT_TIME_SEC;
76 mark_inode_dirty(inode);
77 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 case REISERFS_IOC_GETVERSION:
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070080 return put_user(inode->i_generation, (int __user *)arg);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 case REISERFS_IOC_SETVERSION:
82 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
83 return -EPERM;
84 if (IS_RDONLY(inode))
85 return -EROFS;
Linus Torvaldsbd4c6252005-07-12 20:21:28 -070086 if (get_user(inode->i_generation, (int __user *)arg))
87 return -EFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 inode->i_ctime = CURRENT_TIME_SEC;
89 mark_inode_dirty(inode);
90 return 0;
91 default:
92 return -ENOTTY;
93 }
94}
95
96/*
97** reiserfs_unpack
98** Function try to convert tail from direct item into indirect.
99** It set up nopack attribute in the REISERFS_I(inode)->nopack
100*/
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700101static int reiserfs_unpack(struct inode *inode, struct file *filp)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102{
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700103 int retval = 0;
104 int index;
105 struct page *page;
106 struct address_space *mapping;
107 unsigned long write_from;
108 unsigned long blocksize = inode->i_sb->s_blocksize;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700110 if (inode->i_size == 0) {
111 REISERFS_I(inode)->i_flags |= i_nopack_mask;
112 return 0;
113 }
114 /* ioctl already done */
115 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
116 return 0;
117 }
118 reiserfs_write_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700120 /* we need to make sure nobody is changing the file size beneath
121 ** us
122 */
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800123 mutex_lock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700124
125 write_from = inode->i_size & (blocksize - 1);
126 /* if we are on a block boundary, we are already unpacked. */
127 if (write_from == 0) {
128 REISERFS_I(inode)->i_flags |= i_nopack_mask;
129 goto out;
130 }
131
132 /* we unpack by finding the page with the tail, and calling
133 ** reiserfs_prepare_write on that page. This will force a
134 ** reiserfs_get_block to unpack the tail for us.
135 */
136 index = inode->i_size >> PAGE_CACHE_SHIFT;
137 mapping = inode->i_mapping;
138 page = grab_cache_page(mapping, index);
139 retval = -ENOMEM;
140 if (!page) {
141 goto out;
142 }
143 retval =
144 mapping->a_ops->prepare_write(NULL, page, write_from, write_from);
145 if (retval)
146 goto out_unlock;
147
148 /* conversion can change page contents, must flush */
149 flush_dcache_page(page);
150 retval =
151 mapping->a_ops->commit_write(NULL, page, write_from, write_from);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 REISERFS_I(inode)->i_flags |= i_nopack_mask;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700154 out_unlock:
155 unlock_page(page);
156 page_cache_release(page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700158 out:
Jes Sorensen1b1dcc12006-01-09 15:59:24 -0800159 mutex_unlock(&inode->i_mutex);
Linus Torvaldsbd4c6252005-07-12 20:21:28 -0700160 reiserfs_write_unlock(inode->i_sb);
161 return retval;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}