1 files changed, 127 insertions, 88 deletions

diff --git a/fs/jffs2/wbuf.c b/fs/jffs2/wbuf.c
index 316133c626b7..4cebf0e57c46 100644
--- a/fs/jffs2/wbuf.c
+++ b/fs/jffs2/wbuf.c
@@ -9,7 +9,7 @@
  *
  * For licensing information, see the file 'LICENCE' in this directory.
  *
- * $Id: wbuf.c,v 1.92 2005/04/05 12:51:54 dedekind Exp $
+ * $Id: wbuf.c,v 1.100 2005/09/30 13:59:13 dedekind Exp $
  *
  */
 
@@ -30,12 +30,12 @@
 static unsigned char *brokenbuf;
 #endif
 
+#define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
+#define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
+
 /* max. erase failures before we mark a block bad */
 #define MAX_ERASE_FAILURES      2
 
-/* two seconds timeout for timed wbuf-flushing */
-#define WBUF_FLUSH_TIMEOUT      2 * HZ
-
 struct jffs2_inodirty {
         uint32_t ino;
         struct jffs2_inodirty *next;
@@ -139,7 +139,6 @@ static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock
 {
         D1(printk("About to refile bad block at %08x\n", jeb->offset));
 
-        D2(jffs2_dump_block_lists(c));
         /* File the existing block on the bad_used_list.... */
         if (c->nextblock == jeb)
                 c->nextblock = NULL;
@@ -156,7 +155,6 @@ static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock
                 c->nr_erasing_blocks++;
                 jffs2_erase_pending_trigger(c);
         }
-        D2(jffs2_dump_block_lists(c));
 
         /* Adjust its size counts accordingly */
         c->wasted_size += jeb->free_size;
@@ -164,8 +162,9 @@ static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock
         jeb->wasted_size += jeb->free_size;
         jeb->free_size = 0;
 
-        ACCT_SANITY_CHECK(c,jeb);
-        D1(ACCT_PARANOIA_CHECK(jeb));
+        jffs2_dbg_dump_block_lists_nolock(c);
+        jffs2_dbg_acct_sanity_check_nolock(c,jeb);
+        jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
 }
 
 /* Recover from failure to write wbuf. Recover the nodes up to the
@@ -189,7 +188,7 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
         /* Find the first node to be recovered, by skipping over every
            node which ends before the wbuf starts, or which is obsolete. */
         first_raw = &jeb->first_node;
-        while (*first_raw && 
+        while (*first_raw &&
                (ref_obsolete(*first_raw) ||
                 (ref_offset(*first_raw)+ref_totlen(c, jeb, *first_raw)) < c->wbuf_ofs)) {
                 D1(printk(KERN_DEBUG "Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n",
@@ -238,7 +237,7 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
                         ret = c->mtd->read_ecc(c->mtd, start, c->wbuf_ofs - start, &retlen, buf, NULL, c->oobinfo);
                 else
                         ret = c->mtd->read(c->mtd, start, c->wbuf_ofs - start, &retlen, buf);
-                
+
                 if (ret == -EBADMSG && retlen == c->wbuf_ofs - start) {
                         /* ECC recovered */
                         ret = 0;
@@ -266,7 +265,7 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
 
 
         /* ... and get an allocation of space from a shiny new block instead */
-        ret = jffs2_reserve_space_gc(c, end-start, &ofs, &len);
+        ret = jffs2_reserve_space_gc(c, end-start, &ofs, &len, JFFS2_SUMMARY_NOSUM_SIZE);
         if (ret) {
                 printk(KERN_WARNING "Failed to allocate space for wbuf recovery. Data loss ensues.\n");
                 kfree(buf);
@@ -275,15 +274,15 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
         if (end-start >= c->wbuf_pagesize) {
                 /* Need to do another write immediately, but it's possible
                    that this is just because the wbuf itself is completely
-                   full, and there's nothing earlier read back from the 
-                   flash. Hence 'buf' isn't necessarily what we're writing 
+                   full, and there's nothing earlier read back from the
+                   flash. Hence 'buf' isn't necessarily what we're writing
                    from. */
                 unsigned char *rewrite_buf = buf?:c->wbuf;
                 uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize);
 
                 D1(printk(KERN_DEBUG "Write 0x%x bytes at 0x%08x in wbuf recover\n",
                           towrite, ofs));
-          
+
 #ifdef BREAKMEHEADER
                 static int breakme;
                 if (breakme++ == 20) {
@@ -327,8 +326,7 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
                 c->wbuf_ofs = ofs + towrite;
                 memmove(c->wbuf, rewrite_buf + towrite, c->wbuf_len);
                 /* Don't muck about with c->wbuf_inodes. False positives are harmless. */
-                if (buf)
-                        kfree(buf);
+                kfree(buf);
         } else {
                 /* OK, now we're left with the dregs in whichever buffer we're using */
                 if (buf) {
@@ -392,11 +390,11 @@ static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
         else
                 jeb->last_node = container_of(first_raw, struct jffs2_raw_node_ref, next_phys);
 
-        ACCT_SANITY_CHECK(c,jeb);
-        D1(ACCT_PARANOIA_CHECK(jeb));
+        jffs2_dbg_acct_sanity_check_nolock(c, jeb);
+        jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
 
-        ACCT_SANITY_CHECK(c,new_jeb);
-        D1(ACCT_PARANOIA_CHECK(new_jeb));
+        jffs2_dbg_acct_sanity_check_nolock(c, new_jeb);
+        jffs2_dbg_acct_paranoia_check_nolock(c, new_jeb);
 
         spin_unlock(&c->erase_completion_lock);
 
@@ -435,15 +433,15 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
            this happens, if we have a change to a new block,
            or if fsync forces us to flush the writebuffer.
            if we have a switch to next page, we will not have
-           enough remaining space for this. 
+           enough remaining space for this.
         */
-        if (pad && !jffs2_dataflash(c)) {
+        if (pad ) {
                 c->wbuf_len = PAD(c->wbuf_len);
 
                 /* Pad with JFFS2_DIRTY_BITMASK initially.  this helps out ECC'd NOR
                    with 8 byte page size */
                 memset(c->wbuf + c->wbuf_len, 0, c->wbuf_pagesize - c->wbuf_len);
-                
+
                 if ( c->wbuf_len + sizeof(struct jffs2_unknown_node) < c->wbuf_pagesize) {
                         struct jffs2_unknown_node *padnode = (void *)(c->wbuf + c->wbuf_len);
                         padnode->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
@@ -454,7 +452,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
         }
         /* else jffs2_flash_writev has actually filled in the rest of the
            buffer for us, and will deal with the node refs etc. later. */
-        
+
 #ifdef BREAKME
         static int breakme;
         if (breakme++ == 20) {
@@ -463,9 +461,9 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
                 c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize,
                                         &retlen, brokenbuf, NULL, c->oobinfo);
                 ret = -EIO;
-        } else 
+        } else
 #endif
-        
+
         if (jffs2_cleanmarker_oob(c))
                 ret = c->mtd->write_ecc(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen, c->wbuf, NULL, c->oobinfo);
         else
@@ -488,7 +486,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
         spin_lock(&c->erase_completion_lock);
 
         /* Adjust free size of the block if we padded. */
-        if (pad && !jffs2_dataflash(c)) {
+        if (pad) {
                 struct jffs2_eraseblock *jeb;
 
                 jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
@@ -496,7 +494,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
                 D1(printk(KERN_DEBUG "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n",
                           (jeb==c->nextblock)?"next":"", jeb->offset));
 
-                /* wbuf_pagesize - wbuf_len is the amount of space that's to be 
+                /* wbuf_pagesize - wbuf_len is the amount of space that's to be
                    padded. If there is less free space in the block than that,
                    something screwed up */
                 if (jeb->free_size < (c->wbuf_pagesize - c->wbuf_len)) {
@@ -524,9 +522,9 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
         return 0;
 }
 
-/* Trigger garbage collection to flush the write-buffer. 
+/* Trigger garbage collection to flush the write-buffer.
    If ino arg is zero, do it if _any_ real (i.e. not GC) writes are
-   outstanding. If ino arg non-zero, do it only if a write for the 
+   outstanding. If ino arg non-zero, do it only if a write for the
    given inode is outstanding. */
 int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino)
 {
@@ -605,15 +603,6 @@ int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
 
         return ret;
 }
-
-#ifdef CONFIG_JFFS2_FS_WRITEBUFFER
-#define PAGE_DIV(x) ( ((unsigned long)(x) / (unsigned long)(c->wbuf_pagesize)) * (unsigned long)(c->wbuf_pagesize) )
-#define PAGE_MOD(x) ( (unsigned long)(x) % (unsigned long)(c->wbuf_pagesize) )
-#else
-#define PAGE_DIV(x) ( (x) & (~(c->wbuf_pagesize - 1)) )
-#define PAGE_MOD(x) ( (x) & (c->wbuf_pagesize - 1) )
-#endif
-
 int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsigned long count, loff_t to, size_t *retlen, uint32_t ino)
 {
         struct kvec outvecs[3];
@@ -630,13 +619,13 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
         /* If not NAND flash, don't bother */
         if (!jffs2_is_writebuffered(c))
                 return jffs2_flash_direct_writev(c, invecs, count, to, retlen);
-        
+
         down_write(&c->wbuf_sem);
 
         /* If wbuf_ofs is not initialized, set it to target address */
         if (c->wbuf_ofs == 0xFFFFFFFF) {
                 c->wbuf_ofs = PAGE_DIV(to);
-                c->wbuf_len = PAGE_MOD(to);                     
+                c->wbuf_len = PAGE_MOD(to);
                 memset(c->wbuf,0xff,c->wbuf_pagesize);
         }
 
@@ -650,10 +639,10 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
                         memset(c->wbuf,0xff,c->wbuf_pagesize);
                 }
         }
-        
-        /* Sanity checks on target address. 
-           It's permitted to write at PAD(c->wbuf_len+c->wbuf_ofs), 
-           and it's permitted to write at the beginning of a new 
+
+        /* Sanity checks on target address.
+           It's permitted to write at PAD(c->wbuf_len+c->wbuf_ofs),
+           and it's permitted to write at the beginning of a new
            erase block. Anything else, and you die.
            New block starts at xxx000c (0-b = block header)
         */
@@ -671,8 +660,8 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
                 }
                 /* set pointer to new block */
                 c->wbuf_ofs = PAGE_DIV(to);
-                c->wbuf_len = PAGE_MOD(to);                     
-        } 
+                c->wbuf_len = PAGE_MOD(to);
+        }
 
         if (to != PAD(c->wbuf_ofs + c->wbuf_len)) {
                 /* We're not writing immediately after the writebuffer. Bad. */
@@ -692,21 +681,21 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
         invec = 0;
         outvec = 0;
 
-        /* Fill writebuffer first, if already in use */ 
+        /* Fill writebuffer first, if already in use */
         if (c->wbuf_len) {
                 uint32_t invec_ofs = 0;
 
-                /* adjust alignment offset */ 
+                /* adjust alignment offset */
                 if (c->wbuf_len != PAGE_MOD(to)) {
                         c->wbuf_len = PAGE_MOD(to);
                         /* take care of alignment to next page */
                         if (!c->wbuf_len)
                                 c->wbuf_len = c->wbuf_pagesize;
                 }
-                
+
                 while(c->wbuf_len < c->wbuf_pagesize) {
                         uint32_t thislen;
-                        
+
                         if (invec == count)
                                 goto alldone;
 
@@ -714,17 +703,17 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
 
                         if (thislen >= invecs[invec].iov_len)
                                 thislen = invecs[invec].iov_len;
-        
+
                         invec_ofs = thislen;
 
                         memcpy(c->wbuf + c->wbuf_len, invecs[invec].iov_base, thislen);
                         c->wbuf_len += thislen;
                         donelen += thislen;
                         /* Get next invec, if actual did not fill the buffer */
-                        if (c->wbuf_len < c->wbuf_pagesize) 
+                        if (c->wbuf_len < c->wbuf_pagesize)
                                 invec++;
-                }                       
-                
+                }
+
                 /* write buffer is full, flush buffer */
                 ret = __jffs2_flush_wbuf(c, NOPAD);
                 if (ret) {
@@ -783,10 +772,10 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
 
                 /* We did cross a page boundary, so we write some now */
                 if (jffs2_cleanmarker_oob(c))
-                        ret = c->mtd->writev_ecc(c->mtd, outvecs, splitvec+1, outvec_to, &wbuf_retlen, NULL, c->oobinfo); 
+                        ret = c->mtd->writev_ecc(c->mtd, outvecs, splitvec+1, outvec_to, &wbuf_retlen, NULL, c->oobinfo);
                 else
                         ret = jffs2_flash_direct_writev(c, outvecs, splitvec+1, outvec_to, &wbuf_retlen);
-                
+
                 if (ret < 0 || wbuf_retlen != PAGE_DIV(totlen)) {
                         /* At this point we have no problem,
                            c->wbuf is empty. However refile nextblock to avoid
@@ -803,7 +792,7 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
                         spin_unlock(&c->erase_completion_lock);
                         goto exit;
                 }
-                
+
                 donelen += wbuf_retlen;
                 c->wbuf_ofs = PAGE_DIV(outvec_to) + PAGE_DIV(totlen);
 
@@ -837,11 +826,17 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
 alldone:
         *retlen = donelen;
 
+        if (jffs2_sum_active()) {
+                int res = jffs2_sum_add_kvec(c, invecs, count, (uint32_t) to);
+                if (res)
+                        return res;
+        }
+
         if (c->wbuf_len && ino)
                 jffs2_wbuf_dirties_inode(c, ino);
 
         ret = 0;
-        
+
 exit:
         up_write(&c->wbuf_sem);
         return ret;
@@ -856,7 +851,7 @@ int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *r
         struct kvec vecs[1];
 
         if (!jffs2_is_writebuffered(c))
-                return c->mtd->write(c->mtd, ofs, len, retlen, buf);
+                return jffs2_flash_direct_write(c, ofs, len, retlen, buf);
 
         vecs[0].iov_base = (unsigned char *) buf;
         vecs[0].iov_len = len;
@@ -884,18 +879,18 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re
         if ( (ret == -EBADMSG) && (*retlen == len) ) {
                 printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n",
                        len, ofs);
-                /* 
-                 * We have the raw data without ECC correction in the buffer, maybe 
+                /*
+                 * We have the raw data without ECC correction in the buffer, maybe
                  * we are lucky and all data or parts are correct. We check the node.
                  * If data are corrupted node check will sort it out.
                  * We keep this block, it will fail on write or erase and the we
                  * mark it bad. Or should we do that now? But we should give him a chance.
-                 * Maybe we had a system crash or power loss before the ecc write or  
+                 * Maybe we had a system crash or power loss before the ecc write or
                  * a erase was completed.
                  * So we return success. :)
                  */
                 ret = 0;
-        }       
+        }
 
         /* if no writebuffer available or write buffer empty, return */
         if (!c->wbuf_pagesize || !c->wbuf_len)
@@ -910,16 +905,16 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re
                 if (owbf > c->wbuf_len)         /* is read beyond write buffer ? */
                         goto exit;
                 lwbf = c->wbuf_len - owbf;      /* number of bytes to copy */
-                if (lwbf > len) 
+                if (lwbf > len)
                         lwbf = len;
-        } else {        
+        } else {
                 orbf = (c->wbuf_ofs - ofs);     /* offset in read buffer */
                 if (orbf > len)                 /* is write beyond write buffer ? */
                         goto exit;
                 lwbf = len - orbf;              /* number of bytes to copy */
-                if (lwbf > c->wbuf_len) 
+                if (lwbf > c->wbuf_len)
                         lwbf = c->wbuf_len;
-        }       
+        }
         if (lwbf > 0)
                 memcpy(buf+orbf,c->wbuf+owbf,lwbf);
 
@@ -947,7 +942,7 @@ int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb
                 printk(KERN_NOTICE "jffs2_check_oob_empty(): allocation of temporary data buffer for oob check failed\n");
                 return -ENOMEM;
         }
-        /* 
+        /*
          * if mode = 0, we scan for a total empty oob area, else we have
          * to take care of the cleanmarker in the first page of the block
         */
@@ -956,41 +951,41 @@ int jffs2_check_oob_empty( struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb
                 D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB failed %d for block at %08x\n", ret, jeb->offset));
                 goto out;
         }
-        
+
         if (retlen < len) {
                 D1(printk(KERN_WARNING "jffs2_check_oob_empty(): Read OOB return short read "
                           "(%zd bytes not %d) for block at %08x\n", retlen, len, jeb->offset));
                 ret = -EIO;
                 goto out;
         }
-        
+
         /* Special check for first page */
         for(i = 0; i < oob_size ; i++) {
                 /* Yeah, we know about the cleanmarker. */
-                if (mode && i >= c->fsdata_pos && 
+                if (mode && i >= c->fsdata_pos &&
                     i < c->fsdata_pos + c->fsdata_len)
                         continue;
 
                 if (buf[i] != 0xFF) {
                         D2(printk(KERN_DEBUG "Found %02x at %x in OOB for %08x\n",
-                                  buf[page+i], page+i, jeb->offset));
-                        ret = 1; 
+                                  buf[i], i, jeb->offset));
+                        ret = 1;
                         goto out;
                 }
         }
 
-        /* we know, we are aligned :) */        
+        /* we know, we are aligned :) */
         for (page = oob_size; page < len; page += sizeof(long)) {
                 unsigned long dat = *(unsigned long *)(&buf[page]);
                 if(dat != -1) {
-                        ret = 1; 
+                        ret = 1;
                         goto out;
                 }
         }
 
 out:
-        kfree(buf);     
-        
+        kfree(buf);
+
         return ret;
 }
 
@@ -1072,7 +1067,7 @@ int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_erasebloc
         n.totlen = cpu_to_je32(8);
 
         ret = jffs2_flash_write_oob(c, jeb->offset + c->fsdata_pos, c->fsdata_len, &retlen, (unsigned char *)&n);
-        
+
         if (ret) {
                 D1(printk(KERN_WARNING "jffs2_write_nand_cleanmarker(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
                 return ret;
@@ -1084,7 +1079,7 @@ int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c, struct jffs2_erasebloc
         return 0;
 }
 
-/* 
+/*
  * On NAND we try to mark this block bad. If the block was erased more
  * than MAX_ERASE_FAILURES we mark it finaly bad.
  * Don't care about failures. This block remains on the erase-pending
@@ -1105,7 +1100,7 @@ int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *
 
         D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Marking bad block at %08x\n", bad_offset));
         ret = c->mtd->block_markbad(c->mtd, bad_offset);
-        
+
         if (ret) {
                 D1(printk(KERN_WARNING "jffs2_write_nand_badblock(): Write failed for block at %08x: error %d\n", jeb->offset, ret));
                 return ret;
@@ -1129,7 +1124,7 @@ static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
         /* Do this only, if we have an oob buffer */
         if (!c->mtd->oobsize)
                 return 0;
-        
+
         /* Cleanmarker is out-of-band, so inline size zero */
         c->cleanmarker_size = 0;
 
@@ -1155,7 +1150,7 @@ static int jffs2_nand_set_oobinfo(struct jffs2_sb_info *c)
                         c->fsdata_len = NAND_JFFS2_OOB16_FSDALEN;
                         c->badblock_pos = 15;
                         break;
-        
+
                 default:
                         D1(printk(KERN_DEBUG "JFFS2 on NAND. No autoplacment info found\n"));
                         return -EINVAL;
@@ -1172,7 +1167,7 @@ int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
         init_rwsem(&c->wbuf_sem);
         c->wbuf_pagesize = c->mtd->oobblock;
         c->wbuf_ofs = 0xFFFFFFFF;
-        
+
         c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
         if (!c->wbuf)
                 return -ENOMEM;
@@ -1198,17 +1193,41 @@ void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
 
 int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
         c->cleanmarker_size = 0;                /* No cleanmarkers needed */
-        
+
         /* Initialize write buffer */
         init_rwsem(&c->wbuf_sem);
-        c->wbuf_pagesize = c->sector_size;
-        c->wbuf_ofs = 0xFFFFFFFF;
 
+
+        c->wbuf_pagesize =  c->mtd->erasesize;
+
+        /* Find a suitable c->sector_size
+         * - Not too much sectors
+         * - Sectors have to be at least 4 K + some bytes
+         * - All known dataflashes have erase sizes of 528 or 1056
+         * - we take at least 8 eraseblocks and want to have at least 8K size
+         * - The concatenation should be a power of 2
+        */
+
+        c->sector_size = 8 * c->mtd->erasesize;
+
+        while (c->sector_size < 8192) {
+                c->sector_size *= 2;
+        }
+
+        /* It may be necessary to adjust the flash size */
+        c->flash_size = c->mtd->size;
+
+        if ((c->flash_size % c->sector_size) != 0) {
+                c->flash_size = (c->flash_size / c->sector_size) * c->sector_size;
+                printk(KERN_WARNING "JFFS2 flash size adjusted to %dKiB\n", c->flash_size);
+        };
+
+        c->wbuf_ofs = 0xFFFFFFFF;
         c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
         if (!c->wbuf)
                 return -ENOMEM;
 
-        printk(KERN_INFO "JFFS2 write-buffering enabled (%i)\n", c->wbuf_pagesize);
+        printk(KERN_INFO "JFFS2 write-buffering enabled buffer (%d) erasesize (%d)\n", c->wbuf_pagesize, c->sector_size);
 
         return 0;
 }
@@ -1236,3 +1255,23 @@ int jffs2_nor_ecc_flash_setup(struct jffs2_sb_info *c) {
 void jffs2_nor_ecc_flash_cleanup(struct jffs2_sb_info *c) {
         kfree(c->wbuf);
 }
+
+int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
+        /* Cleanmarker currently occupies a whole programming region */
+        c->cleanmarker_size = MTD_PROGREGION_SIZE(c->mtd);
+
+        /* Initialize write buffer */
+        init_rwsem(&c->wbuf_sem);
+        c->wbuf_pagesize = MTD_PROGREGION_SIZE(c->mtd);
+        c->wbuf_ofs = 0xFFFFFFFF;
+
+        c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+        if (!c->wbuf)
+                return -ENOMEM;
+
+        return 0;
+}
+
+void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {
+        kfree(c->wbuf);
+}