patch-2.3.2 linux/fs/hpfs/inode.c

• Lines: 381
• Date: Thu May 13 23:48:20 1999
• Orig file: v2.3.1/linux/fs/hpfs/inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.3.1/linux/fs/hpfs/inode.c linux/fs/hpfs/inode.c
@@ -0,0 +1,380 @@
+/*
+ *  linux/fs/hpfs/inode.c
+ *
+ *  Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
+ *
+ *  inode VFS functions
+ */
+
+#include "hpfs_fn.h"
+
+static const struct file_operations hpfs_file_ops =
+{
+	NULL,				/* lseek - default */
+	hpfs_file_read,			/* read */
+	hpfs_file_write,		/* write */
+	NULL,				/* readdir - bad */
+	NULL,				/* poll - default */
+	NULL,				/* ioctl - default */
+	generic_file_mmap/*hpfs_mmap*/,	/* mmap */
+	hpfs_open,			/* open */
+	NULL,				/* flush */
+	hpfs_file_release,		/* release */
+	hpfs_file_fsync,		/* fsync */
+	NULL,				/* fasync */
+	NULL,				/* check_media_change */
+	NULL,				/* revalidate */
+	NULL,				/* lock */
+};
+
+static const struct inode_operations hpfs_file_iops =
+{
+	(nonconst *) & hpfs_file_ops,	/* default file operations */
+	NULL,				/* create */
+	NULL,				/* lookup */
+	NULL,				/* link */
+	NULL,				/* unlink */
+	NULL,				/* symlink */
+	NULL,				/* mkdir */
+	NULL,				/* rmdir */
+	NULL,				/* mknod */
+	NULL,				/* rename */
+	NULL,				/* readlink */
+	NULL,				/* follow_link */
+	generic_readpage,		/* readpage */
+	NULL,				/* writepage */
+	(int (*)(struct inode *, int))
+	&hpfs_bmap,			/* bmap */
+	&hpfs_truncate,			/* truncate */
+	NULL,				/* permission */
+	NULL,				/* smap */
+	NULL,				/* updatepage */
+	NULL,				/* revalidate */
+};
+
+static const struct file_operations hpfs_dir_ops =
+{
+	NULL,				/* lseek - default */
+	hpfs_dir_read,			/* read */
+	NULL,				/* write - bad */
+	hpfs_readdir,			/* readdir */
+	NULL,				/* poll - default */
+	NULL,				/* ioctl - default */
+	NULL,				/* mmap */
+	hpfs_open,			/* open */
+	NULL,				/* flush */
+	hpfs_dir_release,		/* no special release code */
+	hpfs_file_fsync,		/* fsync */
+	NULL,				/* fasync */
+	NULL,				/* check_media_change */
+	NULL,				/* revalidate */
+	NULL,				/* lock */
+};
+
+static const struct inode_operations hpfs_dir_iops =
+{
+	(nonconst *) & hpfs_dir_ops,	/* default directory file ops */
+	hpfs_create,			/* create */
+	hpfs_lookup,			/* lookup */
+	NULL,				/* link */
+	hpfs_unlink,			/* unlink */
+	hpfs_symlink,			/* symlink */
+	hpfs_mkdir,			/* mkdir */
+	hpfs_rmdir,			/* rmdir */
+	hpfs_mknod,			/* mknod */
+	hpfs_rename,			/* rename */
+	NULL,				/* readlink */
+	NULL,				/* follow_link */
+	NULL,				/* readpage */
+	NULL,				/* writepage */
+	NULL,				/* bmap */
+	NULL,				/* truncate */
+	NULL,				/* permission */
+	NULL,				/* smap */
+	NULL,				/* updatepage */
+	NULL,				/* revalidate */
+};
+
+const struct inode_operations hpfs_symlink_iops =
+{
+	NULL,				/* default file operations */
+	NULL,				/* create */
+	NULL,				/* lookup */
+	NULL,				/* link */
+	NULL,				/* unlink */
+	NULL,				/* symlink */
+	NULL,				/* mkdir */
+	NULL,				/* rmdir */
+	NULL,				/* mknod */
+	NULL,				/* rename */
+	hpfs_readlink,			/* readlink */
+	hpfs_follow_link,		/* follow_link */
+	NULL,				/* readpage */
+	NULL,				/* writepage */
+	NULL,				/* bmap */
+	NULL,				/* truncate */
+	NULL,				/* permission */
+	NULL,				/* smap */
+	NULL,				/* updatepage */
+	NULL,				/* revalidate */
+};
+
+
+void hpfs_read_inode(struct inode *i)
+{
+	struct buffer_head *bh;
+	struct fnode *fnode;
+	struct super_block *sb = i->i_sb;
+	unsigned char *ea;
+	int ea_size;
+	i->i_op = 0;
+	init_MUTEX(&i->i_hpfs_sem);
+	i->i_uid = sb->s_hpfs_uid;
+	i->i_gid = sb->s_hpfs_gid;
+	i->i_mode = sb->s_hpfs_mode;
+	i->i_hpfs_conv = sb->s_hpfs_conv;
+	i->i_blksize = 512;
+	i->i_size = -1;
+	i->i_blocks = -1;
+	
+	i->i_hpfs_dno = 0;
+	i->i_hpfs_n_secs = 0;
+	i->i_hpfs_file_sec = 0;
+	i->i_hpfs_disk_sec = 0;
+	i->i_hpfs_dpos = 0;
+	i->i_hpfs_dsubdno = 0;
+	i->i_hpfs_ea_mode = 0;
+	i->i_hpfs_ea_uid = 0;
+	i->i_hpfs_ea_gid = 0;
+	i->i_hpfs_ea_size = 0;
+	i->i_version = ++event;
+
+	i->i_hpfs_rddir_off = NULL;
+	i->i_hpfs_dirty = 0;
+
+	i->i_atime = 0;
+	i->i_mtime = 0;
+	i->i_ctime = 0;
+
+	if (!i->i_sb->s_hpfs_rd_inode)
+		hpfs_error(i->i_sb, "read_inode: s_hpfs_rd_inode == 0");
+	if (i->i_sb->s_hpfs_rd_inode == 2) {
+		i->i_mode |= S_IFREG;
+		i->i_mode &= ~0111;
+		i->i_op = (struct inode_operations *) &hpfs_file_iops;
+		i->i_nlink = 1;
+		return;
+	}
+	if (!(fnode = hpfs_map_fnode(sb, i->i_ino, &bh))) {
+		/*i->i_mode |= S_IFREG;
+		i->i_mode &= ~0111;
+		i->i_op = (struct inode_operations *) &hpfs_file_iops;
+		i->i_nlink = 0;*/
+		make_bad_inode(i);
+		return;
+	}
+	if (i->i_sb->s_hpfs_eas) {
+		if ((ea = hpfs_get_ea(i->i_sb, fnode, "UID", &ea_size))) {
+			if (ea_size == 2) {
+				i->i_uid = ea[0] + (ea[1] << 8);
+				i->i_hpfs_ea_uid = 1;
+			}
+			kfree(ea);
+		}
+		if ((ea = hpfs_get_ea(i->i_sb, fnode, "GID", &ea_size))) {
+			if (ea_size == 2) {
+				i->i_gid = ea[0] + (ea[1] << 8);
+				i->i_hpfs_ea_gid = 1;
+			}
+			kfree(ea);
+		}
+		if ((ea = hpfs_get_ea(i->i_sb, fnode, "SYMLINK", &ea_size))) {
+			kfree(ea);
+			i->i_mode = S_IFLNK | 0777;
+			i->i_op = (struct inode_operations *) &hpfs_symlink_iops;
+			i->i_nlink = 1;
+			i->i_size = ea_size;
+			i->i_blocks = 1;
+			brelse(bh);
+			return;
+		}
+		if ((ea = hpfs_get_ea(i->i_sb, fnode, "MODE", &ea_size))) {
+			if (ea_size == 2) {
+				i->i_mode = ea[0] + (ea[1] << 8);
+				i->i_hpfs_ea_mode = 1;
+			}
+			kfree(ea);
+			if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
+				if ((ea = hpfs_get_ea(i->i_sb, fnode, "DEV", &ea_size))) {
+					if (ea_size == 4)
+						i->i_rdev = to_kdev_t(ea[0] + (ea[1] << 8) + (ea[2] << 16) + (ea[3] << 24));
+					kfree(ea);
+				}
+			}
+			if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode) || S_ISFIFO(i->i_mode) || S_ISSOCK(i->i_mode)) {
+				brelse(bh);
+				i->i_nlink = 1;
+				i->i_size = 0;
+				i->i_blocks = 1;
+				i->i_op = NULL;
+				if (S_ISBLK(i->i_mode)) i->i_op = (struct inode_operations *) &blkdev_inode_operations;
+				if (S_ISCHR(i->i_mode)) i->i_op = (struct inode_operations *) &chrdev_inode_operations;
+				if (S_ISFIFO(i->i_mode)) init_fifo(i);
+				return;
+			}
+		}
+	}
+	if (fnode->dirflag) {
+		unsigned n_dnodes, n_subdirs;
+		i->i_mode |= S_IFDIR;
+		i->i_op = (struct inode_operations *) &hpfs_dir_iops;
+		i->i_hpfs_parent_dir = fnode->up;
+		i->i_hpfs_dno = fnode->u.external[0].disk_secno;
+		if (sb->s_hpfs_chk >= 2) {
+			struct buffer_head *bh0;
+			if (hpfs_map_fnode(sb, i->i_hpfs_parent_dir, &bh0)) brelse(bh0);
+		}
+		n_dnodes = 0; n_subdirs = 0;
+		hpfs_count_dnodes(i->i_sb, i->i_hpfs_dno, &n_dnodes, &n_subdirs, NULL);
+		i->i_blocks = 4 * n_dnodes;
+		i->i_size = 2048 * n_dnodes;
+		i->i_nlink = 2 + n_subdirs;
+	} else {
+		i->i_mode |= S_IFREG;
+		if (!i->i_hpfs_ea_mode) i->i_mode &= ~0111;
+		i->i_op = (struct inode_operations *) &hpfs_file_iops;
+		i->i_nlink = 1;
+		i->i_size = fnode->file_size;
+		i->i_blocks = ((i->i_size + 511) >> 9) + 1;
+	}
+	brelse(bh);
+}
+
+void hpfs_write_inode_ea(struct inode *i, struct fnode *fnode)
+{
+	if (fnode->acl_size_l || fnode->acl_size_s) {
+		/* Some unknown structures like ACL may be in fnode,
+		   we'd better not overwrite them */
+		hpfs_error(i->i_sb, "fnode %08x has some unknown HPFS386 stuctures", i->i_ino);
+	} else if (i->i_sb->s_hpfs_eas >= 2) {
+		unsigned char ea[4];
+		if ((i->i_uid != i->i_sb->s_hpfs_uid) || i->i_hpfs_ea_uid) {
+			ea[0] = i->i_uid & 0xff;
+			ea[1] = i->i_uid >> 8;
+			hpfs_set_ea(i, fnode, "UID", ea, 2);
+			i->i_hpfs_ea_uid = 1;
+		}
+		if ((i->i_gid != i->i_sb->s_hpfs_gid) || i->i_hpfs_ea_gid) {
+			ea[0] = i->i_gid & 0xff;
+			ea[1] = i->i_gid >> 8;
+			hpfs_set_ea(i, fnode, "GID", ea, 2);
+			i->i_hpfs_ea_gid = 1;
+		}
+		if (!S_ISLNK(i->i_mode))
+			if ((i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0 : 0111))
+			  | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))
+			  && i->i_mode != ((i->i_sb->s_hpfs_mode & ~(S_ISDIR(i->i_mode) ? 0222 : 0333))
+			  | (S_ISDIR(i->i_mode) ? S_IFDIR : S_IFREG))) || i->i_hpfs_ea_mode) {
+				ea[0] = i->i_mode & 0xff;
+				ea[1] = i->i_mode >> 8;
+				hpfs_set_ea(i, fnode, "MODE", ea, 2);
+				i->i_hpfs_ea_mode = 1;
+			}
+		if (S_ISBLK(i->i_mode) || S_ISCHR(i->i_mode)) {
+			int d = kdev_t_to_nr(i->i_rdev);
+			ea[0] = d & 0xff;
+			ea[1] = (d >> 8) & 0xff;
+			ea[2] = (d >> 16) & 0xff;
+			ea[3] = d >> 24;
+			hpfs_set_ea(i, fnode, "DEV", ea, 4);
+		}
+	}
+}
+
+void hpfs_write_inode(struct inode *i)
+{
+	struct inode *parent;
+	if (!i->i_nlink) return;
+	if (i->i_ino == i->i_sb->s_hpfs_root) return;
+	if (i->i_hpfs_rddir_off && !i->i_count) {
+		if (*i->i_hpfs_rddir_off) printk("HPFS: write_inode: some position still there\n");
+		kfree(i->i_hpfs_rddir_off);
+		i->i_hpfs_rddir_off = NULL;
+	}
+	i->i_hpfs_dirty = 0;
+	hpfs_lock_iget(i->i_sb, 1);
+	parent = iget(i->i_sb, i->i_hpfs_parent_dir);
+	hpfs_unlock_iget(i->i_sb);
+	hpfs_lock_inode(parent);
+	hpfs_write_inode_nolock(i);
+	hpfs_unlock_inode(parent);
+	iput(parent);
+}
+
+void hpfs_write_inode_nolock(struct inode *i)
+{
+	struct buffer_head *bh;
+	struct fnode *fnode;
+	struct quad_buffer_head qbh;
+	struct hpfs_dirent *de;
+	if (i->i_ino == i->i_sb->s_hpfs_root) return;
+	if (!(fnode = hpfs_map_fnode(i->i_sb, i->i_ino, &bh))) return;
+	if (i->i_ino != i->i_sb->s_hpfs_root) {
+		if (!(de = map_fnode_dirent(i->i_sb, i->i_ino, fnode, &qbh))) {
+			brelse(bh);
+			return;
+		}
+	} else de = NULL;
+	if (S_ISREG(i->i_mode)) {
+		fnode->file_size = de->file_size = i->i_size;
+	} else if (S_ISDIR(i->i_mode)) {
+		fnode->file_size = de->file_size = 0;
+	}
+	hpfs_write_inode_ea(i, fnode);
+	if (de) {
+		de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
+		de->read_date = gmt_to_local(i->i_sb, i->i_atime);
+		de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
+		de->read_only = !(i->i_mode & 0222);
+		de->ea_size = i->i_hpfs_ea_size;
+		hpfs_mark_4buffers_dirty(&qbh);
+		hpfs_brelse4(&qbh);
+	}
+	if (S_ISDIR(i->i_mode)) {
+		if ((de = map_dirent(i, i->i_hpfs_dno, "\001\001", 2, NULL, &qbh, NULL))) {
+			de->write_date = gmt_to_local(i->i_sb, i->i_mtime);
+			de->read_date = gmt_to_local(i->i_sb, i->i_atime);
+			de->creation_date = gmt_to_local(i->i_sb, i->i_ctime);
+			de->read_only = !(i->i_mode & 0222);
+			de->ea_size = /*i->i_hpfs_ea_size*/0;
+			de->file_size = 0;
+			hpfs_mark_4buffers_dirty(&qbh);
+			hpfs_brelse4(&qbh);
+		} else hpfs_error(i->i_sb, "directory %08x doesn't have '.' entry", i->i_ino);
+	}
+	mark_buffer_dirty(bh, 1);
+	brelse(bh);
+}
+
+int hpfs_notify_change(struct dentry *dentry, struct iattr *attr)
+{
+	struct inode *inode = dentry->d_inode;
+	int error;
+	if (inode->i_sb->s_hpfs_root == inode->i_ino) return -EINVAL;
+	if ((error = inode_change_ok(inode, attr))) return error;
+	inode_setattr(inode, attr);
+	hpfs_write_inode(inode);
+	return 0;
+}
+
+void hpfs_write_if_changed(struct inode *inode)
+{
+	if (inode->i_hpfs_dirty) {
+		hpfs_write_inode(inode);
+	}
+}
+
+void hpfs_delete_inode(struct inode *inode)
+{
+	hpfs_remove_fnode(inode->i_sb, inode->i_ino);
+}