patch-2.4.5 linux/fs/freevxfs/vxfs_inode.c

• Lines: 334
• Date: Mon May 21 12:31:06 2001
• Orig file: v2.4.4/linux/fs/freevxfs/vxfs_inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.4/linux/fs/freevxfs/vxfs_inode.c linux/fs/freevxfs/vxfs_inode.c
@@ -0,0 +1,333 @@
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#ident "$Id: vxfs_inode.c,v 1.34 2001/05/21 15:33:08 hch Exp hch $"
+
+/*
+ * Veritas filesystem driver - inode routines.
+ */
+#include <linux/fs.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+
+#include "vxfs.h"
+#include "vxfs_inode.h"
+#include "vxfs_extern.h"
+
+
+extern struct address_space_operations vxfs_aops;
+extern struct address_space_operations vxfs_immed_aops;
+
+extern struct inode_operations vxfs_immed_symlink_iops;
+
+static struct file_operations vxfs_file_operations = {
+	.read =			generic_file_read,
+	.mmap =			generic_file_mmap,
+};
+
+
+kmem_cache_t		*vxfs_inode_cachep;
+
+
+#ifdef DIAGNOSTIC
+/*
+ * Dump inode contents (partially).
+ */
+void
+vxfs_dumpi(struct vxfs_inode_info *vip, ino_t ino)
+{
+	printk(KERN_DEBUG "\n\n");
+	if (ino)
+		printk(KERN_DEBUG "dumping vxfs inode %ld\n", ino);
+	else
+		printk(KERN_DEBUG "dumping unknown vxfs inode\n");
+
+	printk(KERN_DEBUG "---------------------------\n");
+	printk(KERN_DEBUG "mode is %x\n", vip->vii_mode);
+	printk(KERN_DEBUG "nlink:%u, uid:%u, gid:%u\n",
+			vip->vii_nlink, vip->vii_uid, vip->vii_gid);
+	printk(KERN_DEBUG "size:%Lx, blocks:%u\n",
+			vip->vii_size, vip->vii_blocks);
+	printk(KERN_DEBUG "orgtype:%u\n", vip->vii_orgtype);
+}
+#endif
+
+
+/**
+ * vxfs_blkiget - find inode based on extent #
+ * @sbp:	superblock of the filesystem we search in
+ * @extent:	number of the extent to search
+ * @ino:	inode number to search
+ *
+ * Description:
+ *  vxfs_blkiget searches inode @ino in the filesystem described by
+ *  @sbp in the extent @extent.
+ *  Returns the matching VxFS inode on success, else a NULL pointer.
+ *
+ * NOTE:
+ *  While __vxfs_iget uses that pagecache this function uses the
+ *  buffercache.  This function should not be used outside the
+ *  read_super() method, othwerwise the data may be incoherent.
+ */
+struct vxfs_inode_info *
+vxfs_blkiget(struct super_block *sbp, u_long extent, ino_t ino)
+{
+	struct buffer_head		*bp;
+	u_long				block, offset;
+
+	block = extent + ((ino * VXFS_ISIZE) / sbp->s_blocksize);
+	offset = ((ino % (sbp->s_blocksize / VXFS_ISIZE)) * VXFS_ISIZE);
+	bp = bread(sbp->s_dev, block, sbp->s_blocksize);
+
+	if (buffer_mapped(bp)) {
+		struct vxfs_inode_info	*vip;
+		struct vxfs_dinode	*dip;
+
+		if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))
+			goto fail;
+		dip = (struct vxfs_dinode *)(bp->b_data + offset);
+		memcpy(vip, dip, sizeof(struct vxfs_inode_info));
+#ifdef DIAGNOSTIC
+		vxfs_dumpi(vip, ino);
+#endif
+		brelse(bp);
+		return (vip);
+	}
+
+fail:
+	printk(KERN_WARNING "vxfs: unable to read block %ld\n", block);
+	brelse(bp);
+	return NULL;
+}
+
+/**
+ * __vxfs_iget - generic find inode facility
+ * @sbp:		VFS superblock
+ * @ino:		inode number
+ * @ilistp:		inode list
+ *
+ * Description:
+ *  Search the for inode number @ino in the filesystem
+ *  described by @sbp.  Use the specified inode table (@ilistp).
+ *  Returns the matching VxFS inode on success, else a NULL pointer.
+ */
+static struct vxfs_inode_info *
+__vxfs_iget(struct super_block *sbp, ino_t ino, struct inode *ilistp)
+{
+	struct page			*pp;
+	u_long				offset;
+
+	offset = (ino % (PAGE_SIZE / VXFS_ISIZE)) * VXFS_ISIZE;
+	pp = vxfs_get_page(ilistp, ino * VXFS_ISIZE / PAGE_SIZE);
+
+	if (!IS_ERR(pp)) {
+		struct vxfs_inode_info	*vip;
+		struct vxfs_dinode	*dip;
+		caddr_t			kaddr = (char *)page_address(pp);
+
+		if (!(vip = kmem_cache_alloc(vxfs_inode_cachep, SLAB_KERNEL)))
+			goto fail;
+		dip = (struct vxfs_dinode *)(kaddr + offset);
+		memcpy(vip, dip, sizeof(struct vxfs_inode_info));
+#ifdef DIAGNOSTIC
+		vxfs_dumpi(vip, ino);
+#endif
+		vxfs_put_page(pp);
+		return (vip);
+	}
+
+	printk(KERN_WARNING "vxfs: error on page %p\n", pp);
+	return NULL;
+
+fail:
+	printk(KERN_WARNING "vxfs: unable to read inode %ld\n", ino);
+	vxfs_put_page(pp);
+	return NULL;
+}
+
+/**
+ * vxfs_stiget - find inode using the structural inode list
+ * @sbp:	VFS superblock
+ * @ino:	inode #
+ *
+ * Description:
+ *  Find inode @ino in the filesystem described by @sbp using
+ *  the structural inode list.
+ *  Returns the matching VxFS inode on success, else a NULL pointer.
+ */
+struct vxfs_inode_info *
+vxfs_stiget(struct super_block *sbp, ino_t ino)
+{
+        return __vxfs_iget(sbp, ino, VXFS_SBI(sbp)->vsi_stilist);
+}
+
+/**
+ * vxfs_transmod - mode for a VxFS inode
+ * @vip:	VxFS inode
+ *
+ * Description:
+ *  vxfs_transmod returns a Linux mode_t for a given
+ *  VxFS inode structure.
+ */
+static __inline__ mode_t
+vxfs_transmod(struct vxfs_inode_info *vip)
+{
+	mode_t			ret = vip->vii_mode & ~VXFS_TYPE_MASK;
+
+	if (VXFS_ISFIFO(vip))
+		ret |= S_IFIFO;
+	if (VXFS_ISCHR(vip))
+		ret |= S_IFCHR;
+	if (VXFS_ISDIR(vip))
+		ret |= S_IFDIR;
+	if (VXFS_ISBLK(vip))
+		ret |= S_IFBLK;
+	if (VXFS_ISLNK(vip))
+		ret |= S_IFLNK;
+	if (VXFS_ISREG(vip))
+		ret |= S_IFREG;
+	if (VXFS_ISSOC(vip))
+		ret |= S_IFSOCK;
+
+	return (ret);
+}
+
+/**
+ * vxfs_iinit- helper to fill inode fields
+ * @ip:		VFS inode
+ * @vip:	VxFS inode
+ *
+ * Description:
+ *  vxfs_instino is a helper function to fill in all relevant
+ *  fields in @ip from @vip.
+ */
+static void
+vxfs_iinit(struct inode *ip, struct vxfs_inode_info *vip)
+{
+
+	ip->i_mode = vxfs_transmod(vip);
+	ip->i_uid = (uid_t)vip->vii_uid;
+	ip->i_gid = (gid_t)vip->vii_gid;
+
+	ip->i_nlink = vip->vii_nlink;
+	ip->i_size = vip->vii_size;
+
+	ip->i_atime = vip->vii_atime;
+	ip->i_ctime = vip->vii_ctime;
+	ip->i_mtime = vip->vii_mtime;
+
+	ip->i_blksize = PAGE_SIZE;
+	ip->i_blocks = vip->vii_blocks;
+	ip->i_generation = vip->vii_gen;
+
+	ip->u.generic_ip = (void *)vip;
+	
+}
+
+/**
+ * vxfs_fake_inode - get fake inode structure
+ * @sbp:		filesystem superblock
+ * @vip:		fspriv inode
+ *
+ * Description:
+ *  vxfs_fake_inode gets a fake inode (not in the inode hash) for a
+ *  superblock, vxfs_inode pair.
+ *  Returns the filled VFS inode.
+ */
+struct inode *
+vxfs_fake_inode(struct super_block *sbp, struct vxfs_inode_info *vip)
+{
+	struct inode			*ip = NULL;
+
+	if ((ip = new_inode(sbp))) {
+		vxfs_iinit(ip, vip);
+		ip->i_mapping->a_ops = &vxfs_aops;
+	}
+	return (ip);
+}
+
+/**
+ * vxfs_read_inode - fill in inode information
+ * @ip:		inode pointer to fill
+ *
+ * Description:
+ *  vxfs_read_inode reads the disk inode for @ip and fills
+ *  in all relevant fields in @ip.
+ */
+void
+vxfs_read_inode(struct inode *ip)
+{
+	struct super_block		*sbp = ip->i_sb;
+	struct vxfs_inode_info		*vip;
+	struct address_space_operations	*aops;
+	ino_t				ino = ip->i_ino;
+
+	if (!(vip = __vxfs_iget(sbp, ino, VXFS_SBI(sbp)->vsi_ilist)))
+		return;
+
+	vxfs_iinit(ip, vip);
+
+	if (VXFS_ISIMMED(vip))
+		aops = &vxfs_immed_aops;
+	else
+		aops = &vxfs_aops;
+
+	if (S_ISREG(ip->i_mode)) {
+		ip->i_fop = &vxfs_file_operations;
+		ip->i_mapping->a_ops = aops;
+	} else if (S_ISDIR(ip->i_mode)) {
+		ip->i_op = &vxfs_dir_inode_ops;
+		ip->i_fop = &vxfs_dir_operations;
+		ip->i_mapping->a_ops = aops;
+	} else if (S_ISLNK(ip->i_mode)) {
+		if (!VXFS_ISIMMED(vip)) {
+			ip->i_op = &page_symlink_inode_operations;
+			ip->i_mapping->a_ops = &vxfs_aops;
+		} else
+			ip->i_op = &vxfs_immed_symlink_iops;
+	} else
+		init_special_inode(ip, ip->i_mode, vip->vii_rdev);
+
+	return;
+}
+
+/**
+ * vxfs_put_inode - remove inode from main memory
+ * @ip:		inode to discard.
+ *
+ * Description:
+ *  vxfs_put_inode() is called on each iput.  If we are the last
+ *  link in memory, free the fspriv inode area.
+ */
+void
+vxfs_put_inode(struct inode *ip)
+{
+	if (atomic_read(&ip->i_count) == 1)
+		kmem_cache_free(vxfs_inode_cachep, ip->u.generic_ip);
+}