patch-2.4.20 linux-2.4.20/fs/jfs/inode.c

• Lines: 342
• Date: Thu Nov 28 15:53:15 2002
• Orig file: linux-2.4.19/fs/jfs/inode.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/fs/jfs/inode.c linux-2.4.20/fs/jfs/inode.c
@@ -0,0 +1,341 @@
+/*
+ *   Copyright (c) International Business Machines Corp., 2000-2002
+ *   Portions Copyright (c) Christoph Hellwig, 2001-2002
+ *
+ *   This program is free software;  you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation; either version 2 of the License, or 
+ *   (at your option) any later version.
+ * 
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY;  without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See
+ *   the GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program;  if not, write to the Free Software 
+ *   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ */
+
+#include <linux/fs.h>
+//#include <linux/locks.h>
+#include "jfs_incore.h"
+#include "jfs_filsys.h"
+#include "jfs_imap.h"
+#include "jfs_extent.h"
+#include "jfs_unicode.h"
+#include "jfs_debug.h"
+
+
+extern struct inode_operations jfs_dir_inode_operations;
+extern struct inode_operations jfs_file_inode_operations;
+extern struct inode_operations jfs_symlink_inode_operations;
+extern struct file_operations jfs_dir_operations;
+extern struct file_operations jfs_file_operations;
+struct address_space_operations jfs_aops;
+extern int freeZeroLink(struct inode *);
+
+void jfs_clear_inode(struct inode *inode)
+{
+	struct jfs_inode_info *ji = JFS_IP(inode);
+
+	jFYI(1, ("jfs_clear_inode called ip = 0x%p\n", inode));
+
+	if (ji->active_ag != -1) {
+		printk(KERN_ERR "jfs_clear_inode, active_ag = %d\n",
+		       ji->active_ag);
+		printk(KERN_ERR "i_ino = %ld, i_mode = %o\n",
+		       inode->i_ino, inode->i_mode);
+	}
+
+	ASSERT(list_empty(&ji->mp_list));
+	ASSERT(list_empty(&ji->anon_inode_list));
+
+	if (ji->atlhead) {
+		jERROR(1, ("jfs_clear_inode: inode %p has anonymous tlocks\n",
+					inode));
+		jERROR(1, ("i_state = 0x%lx, cflag = 0x%lx\n",
+					inode->i_state, ji->cflag));
+	}
+
+	free_jfs_inode(inode);
+}
+
+void jfs_read_inode(struct inode *inode)
+{
+	int rc;
+
+	rc = alloc_jfs_inode(inode);
+	if (rc) {
+		jFYI(1, ("In jfs_read_inode, alloc_jfs_inode failed"));
+		goto bad_inode;
+	}
+	jFYI(1, ("In jfs_read_inode, inode = 0x%p\n", inode));
+
+	if (diRead(inode))
+		goto bad_inode_free;
+
+	if (S_ISREG(inode->i_mode)) {
+		inode->i_op = &jfs_file_inode_operations;
+		inode->i_fop = &jfs_file_operations;
+		inode->i_mapping->a_ops = &jfs_aops;
+	} else if (S_ISDIR(inode->i_mode)) {
+		inode->i_op = &jfs_dir_inode_operations;
+		inode->i_fop = &jfs_dir_operations;
+		inode->i_mapping->a_ops = &jfs_aops;
+		inode->i_mapping->gfp_mask = GFP_NOFS;
+	} else if (S_ISLNK(inode->i_mode)) {
+		if (inode->i_size > IDATASIZE) {
+			inode->i_op = &page_symlink_inode_operations;
+			inode->i_mapping->a_ops = &jfs_aops;
+		} else
+			inode->i_op = &jfs_symlink_inode_operations;
+	} else {
+		inode->i_op = &jfs_file_inode_operations;
+		init_special_inode(inode, inode->i_mode,
+				   kdev_t_to_nr(inode->i_rdev));
+	}
+
+	return;
+
+      bad_inode_free:
+	free_jfs_inode(inode);
+      bad_inode:
+	make_bad_inode(inode);
+}
+
+/* This define is from fs/open.c */
+#define special_file(m) (S_ISCHR(m)||S_ISBLK(m)||S_ISFIFO(m)||S_ISSOCK(m))
+
+/*
+ * Workhorse of both fsync & write_inode
+ */
+int jfs_commit_inode(struct inode *inode, int wait)
+{
+	int rc = 0;
+	tid_t tid;
+	static int noisy = 5;
+
+	jFYI(1, ("In jfs_commit_inode, inode = 0x%p\n", inode));
+
+	/*
+	 * Don't commit if inode has been committed since last being
+	 * marked dirty, or if it has been deleted.
+	 */
+	if (test_cflag(COMMIT_Nolink, inode) ||
+	    !test_cflag(COMMIT_Dirty, inode))
+		return 0;
+
+	if (isReadOnly(inode)) {
+		/* kernel allows writes to devices on read-only
+		 * partitions and may think inode is dirty
+		 */
+		if (!special_file(inode->i_mode) && noisy) {
+			jERROR(1, ("jfs_commit_inode(0x%p) called on "
+				   "read-only volume\n", inode));
+			jERROR(1, ("Is remount racy?\n"));
+			noisy--;
+		}
+		return 0;
+	}
+
+	tid = txBegin(inode->i_sb, COMMIT_INODE);
+	down(&JFS_IP(inode)->commit_sem);
+	rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
+	txEnd(tid);
+	up(&JFS_IP(inode)->commit_sem);
+	return -rc;
+}
+
+void jfs_write_inode(struct inode *inode, int wait)
+{
+	/*
+	 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
+	 * It has been committed since the last change, but was still
+	 * on the dirty inode list
+	 */
+	if (test_cflag(COMMIT_Nolink, inode) ||
+	    !test_cflag(COMMIT_Dirty, inode))
+		return;
+
+	if (jfs_commit_inode(inode, wait)) {
+		jERROR(1, ("jfs_write_inode: jfs_commit_inode failed!\n"));
+	}
+}
+
+void jfs_delete_inode(struct inode *inode)
+{
+	jFYI(1, ("In jfs_delete_inode, inode = 0x%p\n", inode));
+
+	if (test_cflag(COMMIT_Freewmap, inode))
+		freeZeroLink(inode);
+
+	diFree(inode);
+
+	clear_inode(inode);
+}
+
+void jfs_dirty_inode(struct inode *inode)
+{
+	static int noisy = 5;
+
+	if (isReadOnly(inode)) {
+		if (!special_file(inode->i_mode) && noisy) {
+			/* kernel allows writes to devices on read-only
+			 * partitions and may try to mark inode dirty
+			 */
+			jERROR(1, ("jfs_dirty_inode called on "
+				   "read-only volume\n"));
+			jERROR(1, ("Is remount racy?\n"));
+			noisy--;
+		}
+		return;
+	}
+
+	set_cflag(COMMIT_Dirty, inode);
+}
+
+static int jfs_get_block(struct inode *ip, long lblock,
+			 struct buffer_head *bh_result, int create)
+{
+	s64 lblock64 = lblock;
+	int no_size_check = 0;
+	int rc = 0;
+	int take_locks;
+	xad_t xad;
+	s64 xaddr;
+	int xflag;
+	s32 xlen;
+
+	/*
+	 * If this is a special inode (imap, dmap) or directory,
+	 * the lock should already be taken
+	 */
+	take_locks = ((JFS_IP(ip)->fileset != AGGREGATE_I) &&
+		      !S_ISDIR(ip->i_mode));
+	/*
+	 * Take appropriate lock on inode
+	 */
+	if (take_locks) {
+		if (create)
+			IWRITE_LOCK(ip);
+		else
+			IREAD_LOCK(ip);
+	}
+
+	/*
+	 * A directory's "data" is the inode index table, but i_size is the
+	 * size of the d-tree, so don't check the offset against i_size
+	 */
+	if (S_ISDIR(ip->i_mode))
+		no_size_check = 1;
+
+	if ((no_size_check ||
+	     ((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size)) &&
+	    (xtLookup(ip, lblock64, 1, &xflag, &xaddr, &xlen, no_size_check)
+	     == 0) && xlen) {
+		if (xflag & XAD_NOTRECORDED) {
+			if (!create)
+				/*
+				 * Allocated but not recorded, read treats
+				 * this as a hole
+				 */
+				goto unlock;
+#ifdef _JFS_4K
+			XADoffset(&xad, lblock64);
+			XADlength(&xad, xlen);
+			XADaddress(&xad, xaddr);
+#else				/* _JFS_4K */
+			/*
+			 * As long as block size = 4K, this isn't a problem.
+			 * We should mark the whole page not ABNR, but how
+			 * will we know to mark the other blocks BH_New?
+			 */
+			BUG();
+#endif				/* _JFS_4K */
+			rc = extRecord(ip, &xad);
+			if (rc)
+				goto unlock;
+			bh_result->b_state |= (1UL << BH_New);
+		}
+
+		bh_result->b_dev = ip->i_dev;
+		bh_result->b_blocknr = xaddr;
+		bh_result->b_state |= (1UL << BH_Mapped);
+		goto unlock;
+	}
+	if (!create)
+		goto unlock;
+
+	/*
+	 * Allocate a new block
+	 */
+#ifdef _JFS_4K
+	if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
+		goto unlock;
+	rc = extAlloc(ip, 1, lblock64, &xad, FALSE);
+	if (rc)
+		goto unlock;
+
+	bh_result->b_dev = ip->i_dev;
+	bh_result->b_blocknr = addressXAD(&xad);
+	bh_result->b_state |= ((1UL << BH_Mapped) | (1UL << BH_New));
+
+#else				/* _JFS_4K */
+	/*
+	 * We need to do whatever it takes to keep all but the last buffers
+	 * in 4K pages - see jfs_write.c
+	 */
+	BUG();
+#endif				/* _JFS_4K */
+
+      unlock:
+	/*
+	 * Release lock on inode
+	 */
+	if (take_locks) {
+		if (create)
+			IWRITE_UNLOCK(ip);
+		else
+			IREAD_UNLOCK(ip);
+	}
+	return -rc;
+}
+
+static int jfs_writepage(struct page *page)
+{
+	return block_write_full_page(page, jfs_get_block);
+}
+
+static int jfs_readpage(struct file *file, struct page *page)
+{
+	return block_read_full_page(page, jfs_get_block);
+}
+
+static int jfs_prepare_write(struct file *file,
+			     struct page *page, unsigned from, unsigned to)
+{
+	return block_prepare_write(page, from, to, jfs_get_block);
+}
+
+static int jfs_bmap(struct address_space *mapping, long block)
+{
+	return generic_block_bmap(mapping, block, jfs_get_block);
+}
+
+static int jfs_direct_IO(int rw, struct inode *inode, struct kiobuf *iobuf,
+			 unsigned long blocknr, int blocksize)
+{
+	return generic_direct_IO(rw, inode, iobuf, blocknr,
+				 blocksize, jfs_get_block);
+}
+
+struct address_space_operations jfs_aops = {
+	.readpage	= jfs_readpage,
+	.writepage	= jfs_writepage,
+	.sync_page	= block_sync_page,
+	.prepare_write	= jfs_prepare_write,
+	.commit_write	= generic_commit_write,
+	.bmap		= jfs_bmap,
+	.direct_IO	= jfs_direct_IO,
+};