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,
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 return put_user(flags, (int __user *) arg);
40 case REISERFS_IOC_SETFLAGS: {
44 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
47 if (get_user(flags, (int __user *) arg))
50 if ( ( ( flags ^ REISERFS_I(inode) -> i_attrs) & ( REISERFS_IMMUTABLE_FL | REISERFS_APPEND_FL)) &&
51 !capable( CAP_LINUX_IMMUTABLE ) )
54 if( ( flags & REISERFS_NOTAIL_FL ) &&
55 S_ISREG( inode -> i_mode ) ) {
58 result = reiserfs_unpack( inode, filp );
62 sd_attrs_to_i_attrs( flags, inode );
63 REISERFS_I(inode) -> i_attrs = flags;
64 inode->i_ctime = CURRENT_TIME;
65 mark_inode_dirty(inode);
68 case REISERFS_IOC_GETVERSION:
69 return put_user(inode->i_generation, (int __user *) arg);
70 case REISERFS_IOC_SETVERSION:
71 if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
75 if (get_user(inode->i_generation, (int __user *) arg))
77 inode->i_ctime = CURRENT_TIME;
78 mark_inode_dirty(inode);
87 ** Function try to convert tail from direct item into indirect.
88 ** It set up nopack attribute in the REISERFS_I(inode)->nopack
90 int reiserfs_unpack (struct inode * inode, struct file * filp)
95 struct address_space *mapping ;
96 unsigned long write_from ;
97 unsigned long blocksize = inode->i_sb->s_blocksize ;
99 if (inode->i_size == 0) {
100 REISERFS_I(inode)->i_flags |= i_nopack_mask;
103 /* ioctl already done */
104 if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
107 reiserfs_write_lock(inode->i_sb);
109 /* we need to make sure nobody is changing the file size beneath
112 down(&inode->i_sem) ;
114 write_from = inode->i_size & (blocksize - 1) ;
115 /* if we are on a block boundary, we are already unpacked. */
116 if ( write_from == 0) {
117 REISERFS_I(inode)->i_flags |= i_nopack_mask;
121 /* we unpack by finding the page with the tail, and calling
122 ** reiserfs_prepare_write on that page. This will force a
123 ** reiserfs_get_block to unpack the tail for us.
125 index = inode->i_size >> PAGE_CACHE_SHIFT ;
126 mapping = inode->i_mapping ;
127 page = grab_cache_page(mapping, index) ;
132 retval = mapping->a_ops->prepare_write(NULL, page, write_from, write_from) ;
136 /* conversion can change page contents, must flush */
137 flush_dcache_page(page) ;
138 retval = mapping->a_ops->commit_write(NULL, page, write_from, write_from) ;
139 REISERFS_I(inode)->i_flags |= i_nopack_mask;
143 page_cache_release(page) ;
147 reiserfs_write_unlock(inode->i_sb);