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>
13 ** reiserfs_ioctl - handler for ioctl for inode
14 ** supported commands:
15 ** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
16 ** and prevent packing file (argument arg has to be non-zero)
17 ** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
18 ** 3) That's all for a while ...
20 int reiserfs_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
23 unsigned int flags, oldflags;
26 case REISERFS_IOC_UNPACK:
27 if( S_ISREG( inode -> i_mode ) ) {
29 return reiserfs_unpack (inode, filp);
34 /* following two cases are taken from fs/ext2/ioctl.c by Remy
35 Card (card@masi.ibp.fr) */
36 case REISERFS_IOC_GETFLAGS:
37 flags = REISERFS_I(inode) -> i_attrs;
38 i_attrs_to_sd_attrs( inode, ( __u16 * ) &flags );
39 flags &= REISERFS_FL_USER_VISIBLE;
40 return put_user(flags, (int __user *) arg);
41 case REISERFS_IOC_SETFLAGS: {
45 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
48 if (get_user(flags, (int __user *) arg))
51 oldflags = REISERFS_I(inode) -> i_attrs;
52 if ( (oldflags & REISERFS_IMMUTABLE_FL) || ( ( (flags ^ oldflags) &
53 (REISERFS_IMMUTABLE_FL | REISERFS_IUNLINK_FL | REISERFS_APPEND_FL)) &&
54 !capable( CAP_LINUX_IMMUTABLE ) ) )
57 if( ( flags & REISERFS_NOTAIL_FL ) &&
58 S_ISREG( inode -> i_mode ) ) {
61 result = reiserfs_unpack( inode, filp );
66 flags = flags & REISERFS_FL_USER_MODIFYABLE;
67 flags |= oldflags & ~REISERFS_FL_USER_MODIFYABLE;
68 sd_attrs_to_i_attrs( flags, inode );
69 REISERFS_I(inode) -> i_attrs = flags;
70 inode->i_ctime = CURRENT_TIME;
71 mark_inode_dirty(inode);
74 case REISERFS_IOC_GETVERSION:
75 return put_user(inode->i_generation, (int __user *) arg);
76 case REISERFS_IOC_SETVERSION:
77 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
81 if (get_user(inode->i_generation, (int __user *) arg))
83 inode->i_ctime = CURRENT_TIME;
84 mark_inode_dirty(inode);
93 ** Function try to convert tail from direct item into indirect.
94 ** It set up nopack attribute in the REISERFS_I(inode)->nopack
96 int reiserfs_unpack (struct inode * inode, struct file * filp)
101 struct address_space *mapping ;
102 unsigned long write_from ;
103 unsigned long blocksize = inode->i_sb->s_blocksize ;
105 if (inode->i_size == 0) {
106 REISERFS_I(inode)->i_flags |= i_nopack_mask;
109 /* ioctl already done */
110 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
113 reiserfs_write_lock(inode->i_sb);
115 /* we need to make sure nobody is changing the file size beneath
118 down(&inode->i_sem) ;
120 write_from = inode->i_size & (blocksize - 1) ;
121 /* if we are on a block boundary, we are already unpacked. */
122 if ( write_from == 0) {
123 REISERFS_I(inode)->i_flags |= i_nopack_mask;
127 /* we unpack by finding the page with the tail, and calling
128 ** reiserfs_prepare_write on that page. This will force a
129 ** reiserfs_get_block to unpack the tail for us.
131 index = inode->i_size >> PAGE_CACHE_SHIFT ;
132 mapping = inode->i_mapping ;
133 page = grab_cache_page(mapping, index) ;
138 retval = mapping->a_ops->prepare_write(NULL, page, write_from, write_from) ;
142 /* conversion can change page contents, must flush */
143 flush_dcache_page(page) ;
144 retval = mapping->a_ops->commit_write(NULL, page, write_from, write_from) ;
145 REISERFS_I(inode)->i_flags |= i_nopack_mask;
149 page_cache_release(page) ;
153 reiserfs_write_unlock(inode->i_sb);