2 * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
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>
12 static int reiserfs_unpack (struct inode * inode, struct file * filp);
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 ...
22 int reiserfs_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
25 unsigned int flags, oldflags;
28 case REISERFS_IOC_UNPACK:
29 if( S_ISREG( inode -> i_mode ) ) {
31 return reiserfs_unpack (inode, filp);
36 /* following two cases are taken from fs/ext2/ioctl.c by Remy
37 Card (card@masi.ibp.fr) */
38 case REISERFS_IOC_GETFLAGS:
39 flags = REISERFS_I(inode) -> i_attrs;
40 i_attrs_to_sd_attrs( inode, ( __u16 * ) &flags );
41 flags &= REISERFS_FL_USER_VISIBLE;
42 return put_user(flags, (int __user *) arg);
43 case REISERFS_IOC_SETFLAGS: {
47 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
50 if (get_user(flags, (int __user *) arg))
53 oldflags = REISERFS_I(inode) -> i_attrs;
54 if ( ( (oldflags & REISERFS_IMMUTABLE_FL) ||
55 ( (flags ^ oldflags) &
56 (REISERFS_IMMUTABLE_FL | REISERFS_IUNLINK_FL |
57 REISERFS_APPEND_FL) ) ) &&
58 !capable( CAP_LINUX_IMMUTABLE ) )
61 if( ( flags & REISERFS_NOTAIL_FL ) &&
62 S_ISREG( inode -> i_mode ) ) {
65 result = reiserfs_unpack( inode, filp );
70 flags = flags & REISERFS_FL_USER_MODIFYABLE;
71 flags |= oldflags & ~REISERFS_FL_USER_MODIFYABLE;
72 sd_attrs_to_i_attrs( flags, inode );
73 REISERFS_I(inode) -> i_attrs = flags;
74 inode->i_ctime = CURRENT_TIME_SEC;
75 mark_inode_dirty(inode);
78 case REISERFS_IOC_GETVERSION:
79 return put_user(inode->i_generation, (int __user *) arg);
80 case REISERFS_IOC_SETVERSION:
81 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
85 if (get_user(inode->i_generation, (int __user *) arg))
87 inode->i_ctime = CURRENT_TIME_SEC;
88 mark_inode_dirty(inode);
97 ** Function try to convert tail from direct item into indirect.
98 ** It set up nopack attribute in the REISERFS_I(inode)->nopack
100 static int reiserfs_unpack (struct inode * inode, struct file * filp)
105 struct address_space *mapping ;
106 unsigned long write_from ;
107 unsigned long blocksize = inode->i_sb->s_blocksize ;
109 if (inode->i_size == 0) {
110 REISERFS_I(inode)->i_flags |= i_nopack_mask;
113 /* ioctl already done */
114 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
117 reiserfs_write_lock(inode->i_sb);
119 /* we need to make sure nobody is changing the file size beneath
122 down(&inode->i_sem) ;
124 write_from = inode->i_size & (blocksize - 1) ;
125 /* if we are on a block boundary, we are already unpacked. */
126 if ( write_from == 0) {
127 REISERFS_I(inode)->i_flags |= i_nopack_mask;
131 /* we unpack by finding the page with the tail, and calling
132 ** reiserfs_prepare_write on that page. This will force a
133 ** reiserfs_get_block to unpack the tail for us.
135 index = inode->i_size >> PAGE_CACHE_SHIFT ;
136 mapping = inode->i_mapping ;
137 page = grab_cache_page(mapping, index) ;
142 retval = mapping->a_ops->prepare_write(NULL, page, write_from, write_from) ;
146 /* conversion can change page contents, must flush */
147 flush_dcache_page(page) ;
148 retval = mapping->a_ops->commit_write(NULL, page, write_from, write_from) ;
149 REISERFS_I(inode)->i_flags |= i_nopack_mask;
153 page_cache_release(page) ;
157 reiserfs_write_unlock(inode->i_sb);