patch-2.4.10 linux/fs/jffs2/write.c

• Lines: 323
• Date: Fri Sep 14 14:04:07 2001
• Orig file: v2.4.9/linux/fs/jffs2/write.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.9/linux/fs/jffs2/write.c linux/fs/jffs2/write.c
@@ -0,0 +1,322 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright (C) 2001 Red Hat, Inc.
+ *
+ * Created by David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ * The original JFFS, from which the design for JFFS2 was derived,
+ * was designed and implemented by Axis Communications AB.
+ *
+ * The contents of this file are subject to the Red Hat eCos Public
+ * License Version 1.1 (the "Licence"); you may not use this file
+ * except in compliance with the Licence.  You may obtain a copy of
+ * the Licence at http://www.redhat.com/
+ *
+ * Software distributed under the Licence is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.
+ * See the Licence for the specific language governing rights and
+ * limitations under the Licence.
+ *
+ * The Original Code is JFFS2 - Journalling Flash File System, version 2
+ *
+ * Alternatively, the contents of this file may be used under the
+ * terms of the GNU General Public License version 2 (the "GPL"), in
+ * which case the provisions of the GPL are applicable instead of the
+ * above.  If you wish to allow the use of your version of this file
+ * only under the terms of the GPL and not to allow others to use your
+ * version of this file under the RHEPL, indicate your decision by
+ * deleting the provisions above and replace them with the notice and
+ * other provisions required by the GPL.  If you do not delete the
+ * provisions above, a recipient may use your version of this file
+ * under either the RHEPL or the GPL.
+ *
+ * $Id: write.c,v 1.27 2001/04/11 15:29:34 dwmw2 Exp $
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/fs.h>
+#include <linux/jffs2.h>
+#include <linux/mtd/mtd.h>
+#include "nodelist.h"
+#include "crc32.h"
+
+/* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
+   fill in the raw_inode while you're at it. */
+struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri)
+{
+	struct inode *inode;
+	struct super_block *sb = dir_i->i_sb;
+	struct jffs2_inode_cache *ic;
+	struct jffs2_sb_info *c;
+	struct jffs2_inode_info *f;
+
+	D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode));
+
+	c = JFFS2_SB_INFO(sb);
+	memset(ri, 0, sizeof(*ri));
+
+	ic = jffs2_alloc_inode_cache();
+	if (!ic) {
+		return ERR_PTR(-ENOMEM);
+	}
+	memset(ic, 0, sizeof(*ic));
+	
+	inode = new_inode(sb);
+	
+	if (!inode) {
+		jffs2_free_inode_cache(ic);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	/* Alloc jffs2_inode_info when that's split in 2.5 */
+
+	f = JFFS2_INODE_INFO(inode);
+	memset(f, 0, sizeof(*f));
+	init_MUTEX_LOCKED(&f->sem);
+	f->inocache = ic;
+	inode->i_nlink = f->inocache->nlink = 1;
+	f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;
+	f->inocache->ino = ri->ino = inode->i_ino = ++c->highest_ino;
+	D1(printk(KERN_DEBUG "jffs2_new_inode(): Assigned ino# %d\n", ri->ino));
+	jffs2_add_ino_cache(c, f->inocache);
+
+	ri->magic = JFFS2_MAGIC_BITMASK;
+	ri->nodetype = JFFS2_NODETYPE_INODE;
+	ri->totlen = PAD(sizeof(*ri));
+	ri->hdr_crc = crc32(0, ri, sizeof(struct jffs2_unknown_node)-4);
+	ri->mode = mode;
+	f->highest_version = ri->version = 1;
+	ri->uid = current->fsuid;
+	if (dir_i->i_mode & S_ISGID) {
+		ri->gid = dir_i->i_gid;
+		if (S_ISDIR(mode))
+			ri->mode |= S_ISGID;
+	} else {
+		ri->gid = current->fsgid;
+	}
+	inode->i_mode = ri->mode;
+	inode->i_gid = ri->gid;
+	inode->i_uid = ri->uid;
+	inode->i_atime = inode->i_ctime = inode->i_mtime = 
+		ri->atime = ri->mtime = ri->ctime = CURRENT_TIME;
+	inode->i_blksize = PAGE_SIZE;
+	inode->i_blocks = 0;
+	inode->i_size = 0;
+
+	insert_inode_hash(inode);
+
+	return inode;
+}
+
+/* This ought to be in core MTD code. All registered MTD devices without writev should have
+   this put in place. Bug the MTD maintainer */
+static int mtd_fake_writev(struct mtd_info *mtd, const struct iovec *vecs, unsigned long count, loff_t to, size_t *retlen)
+{
+	unsigned long i;
+	size_t totlen = 0, thislen;
+	int ret = 0;
+
+	for (i=0; i<count; i++) {
+		mtd->write(mtd, to, vecs[i].iov_len, &thislen, vecs[i].iov_base);
+		totlen += thislen;
+		if (ret || thislen != vecs[i].iov_len)
+			break;
+		to += vecs[i].iov_len;
+	}
+	if (retlen)
+		*retlen = totlen;
+	return ret;
+}
+
+
+static inline int mtd_writev(struct mtd_info *mtd, const struct iovec *vecs, unsigned long count, loff_t to, size_t *retlen)
+{
+	if (mtd->writev)
+		return mtd->writev(mtd,vecs,count,to,retlen);
+	else
+		return mtd_fake_writev(mtd, vecs, count, to, retlen);
+}
+
+static void writecheck(struct mtd_info *mtd, __u32 ofs)
+{
+	unsigned char buf[16];
+	ssize_t retlen;
+	int ret, i;
+
+	ret = mtd->read(mtd, ofs, 16, &retlen, buf);
+	if (ret && retlen != 16) {
+		D1(printk(KERN_DEBUG "read failed or short in writecheck(). ret %d, retlen %d\n", ret, retlen));
+		return;
+	}
+	ret = 0;
+	for (i=0; i<16; i++) {
+		if (buf[i] != 0xff)
+			ret = 1;
+	}
+	if (ret) {
+		printk(KERN_WARNING "ARGH. About to write node to 0x%08x on flash, but there's data already there:\n", ofs);
+		printk(KERN_WARNING "0x%08x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", 
+		       ofs,
+		       buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7],
+		       buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]);
+	}
+}
+
+	
+	
+
+/* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it, 
+   write it to the flash, link it into the existing inode/fragment list */
+
+struct jffs2_full_dnode *jffs2_write_dnode(struct inode *inode, struct jffs2_raw_inode *ri, const unsigned char *data, __u32 datalen, __u32 flash_ofs,  __u32 *writelen)
+
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
+	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+	struct jffs2_raw_node_ref *raw;
+	struct jffs2_full_dnode *fn;
+	ssize_t retlen;
+	struct iovec vecs[2];
+	int ret;
+
+	D1(if(ri->hdr_crc != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) {
+		printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n");
+		BUG();
+	}
+	   );
+	vecs[0].iov_base = ri;
+	vecs[0].iov_len = sizeof(*ri);
+	vecs[1].iov_base = (unsigned char *)data;
+	vecs[1].iov_len = datalen;
+
+	writecheck(c->mtd, flash_ofs);
+
+	if (ri->totlen != sizeof(*ri) + datalen) {
+		printk(KERN_WARNING "jffs2_write_dnode: ri->totlen (0x%08x) != sizeof(*ri) (0x%08x) + datalen (0x%08x)\n", ri->totlen, sizeof(*ri), datalen);
+	}
+	raw = jffs2_alloc_raw_node_ref();
+	if (!raw)
+		return ERR_PTR(-ENOMEM);
+	
+	fn = jffs2_alloc_full_dnode();
+	if (!fn) {
+		jffs2_free_raw_node_ref(raw);
+		return ERR_PTR(-ENOMEM);
+	}
+	raw->flash_offset = flash_ofs;
+	raw->totlen = PAD(ri->totlen);
+	raw->next_in_ino = f->inocache->nodes;
+	f->inocache->nodes = raw;
+	raw->next_phys = NULL;
+
+	fn->ofs = ri->offset;
+	fn->size = ri->dsize;
+	fn->frags = 0;
+	fn->raw = raw;
+
+	ret = mtd_writev(c->mtd, vecs, 2, flash_ofs, &retlen);
+	if (ret || (retlen != sizeof(*ri) + datalen)) {
+		printk(KERN_NOTICE "Write of %d bytes at 0x%08x failed. returned %d, retlen %d\n", 
+		       sizeof(*ri)+datalen, flash_ofs, ret, retlen);
+		/* Mark the space as dirtied */
+		if (retlen) {
+			jffs2_add_physical_node_ref(c, raw, sizeof(*ri)+datalen, 1);
+			jffs2_mark_node_obsolete(c, raw);
+		} else {
+			printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset);
+			jffs2_free_raw_node_ref(raw);
+		}
+
+		/* Release the full_dnode which is now useless, and return */
+		jffs2_free_full_dnode(fn);
+		if (writelen)
+			*writelen = retlen;
+		return ERR_PTR(ret?ret:-EIO);
+	}
+	/* Mark the space used */
+	jffs2_add_physical_node_ref(c, raw, retlen, 0);
+	D1(printk(KERN_DEBUG "jffs2_write_dnode wrote node at 0x%08x with dsize 0x%x, csize 0x%x, node_crc 0x%08x, data_crc 0x%08x, totlen 0x%08x\n", flash_ofs, ri->dsize, ri->csize, ri->node_crc, ri->data_crc, ri->totlen));
+	if (writelen)
+		*writelen = retlen;
+
+	f->inocache->nodes = raw;
+	return fn;
+}
+
+struct jffs2_full_dirent *jffs2_write_dirent(struct inode *inode, struct jffs2_raw_dirent *rd, const unsigned char *name, __u32 namelen, __u32 flash_ofs,  __u32 *writelen)
+{
+	struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
+	struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
+	struct jffs2_raw_node_ref *raw;
+	struct jffs2_full_dirent *fd;
+	ssize_t retlen;
+	struct iovec vecs[2];
+	int ret;
+
+	D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name \"%s\"->ino #%u\n", rd->pino, name, rd->ino));
+	writecheck(c->mtd, flash_ofs);
+
+	D1(if(rd->hdr_crc != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) {
+		printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n");
+		BUG();
+	}
+	   );
+
+	vecs[0].iov_base = rd;
+	vecs[0].iov_len = sizeof(*rd);
+	vecs[1].iov_base = (unsigned char *)name;
+	vecs[1].iov_len = namelen;
+	
+	raw = jffs2_alloc_raw_node_ref();
+
+	if (!raw)
+		return ERR_PTR(-ENOMEM);
+
+	fd = jffs2_alloc_full_dirent(namelen+1);
+	if (!fd) {
+		jffs2_free_raw_node_ref(raw);
+		return ERR_PTR(-ENOMEM);
+	}
+	raw->flash_offset = flash_ofs;
+	raw->totlen = PAD(rd->totlen);
+	raw->next_in_ino = f->inocache->nodes;
+	f->inocache->nodes = raw;
+	raw->next_phys = NULL;
+
+	fd->version = rd->version;
+	fd->ino = rd->ino;
+	fd->nhash = full_name_hash(name, strlen(name));
+	fd->type = rd->type;
+	memcpy(fd->name, name, namelen);
+	fd->name[namelen]=0;
+	fd->raw = raw;
+
+	ret = mtd_writev(c->mtd, vecs, 2, flash_ofs, &retlen);
+		if (ret || (retlen != sizeof(*rd) + namelen)) {
+			printk(KERN_NOTICE "Write of %d bytes at 0x%08x failed. returned %d, retlen %d\n", 
+			       sizeof(*rd)+namelen, flash_ofs, ret, retlen);
+		/* Mark the space as dirtied */
+			if (retlen) {
+				jffs2_add_physical_node_ref(c, raw, sizeof(*rd)+namelen, 1);
+				jffs2_mark_node_obsolete(c, raw);
+			} else {
+				printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset);
+				jffs2_free_raw_node_ref(raw);
+			}
+
+		/* Release the full_dnode which is now useless, and return */
+		jffs2_free_full_dirent(fd);
+		if (writelen)
+			*writelen = retlen;
+		return ERR_PTR(ret?ret:-EIO);
+	}
+	/* Mark the space used */
+	jffs2_add_physical_node_ref(c, raw, retlen, 0);
+	if (writelen)
+		*writelen = retlen;
+
+	f->inocache->nodes = raw;
+	return fd;
+}