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[JFFS2] Core changes required to support JFFS2-on-Dataflash devices.
DataFlash page-sizes are not a power of two (they're multiples of 528 bytes). There are a few places in JFFS2 code where sector_size is used as a bitmask. A new macro (SECTOR_ADDR) was defined to calculate these sector addresses. For non-DataFlash devices, the original (faster) bitmask operation is still used. In scan.c, the EMPTY_SCAN_SIZE was a constant of 1024. Since this could be larger than the sector size of the DataFlash, this is now basically set to MIN(sector_size, 1024). Addition of a jffs2_is_writebuffered() macro. Signed-off-by: Andrew Victor <andrew@sanpeople.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Andrew Victor
Thomas Gleixner
parent
045e9a5d51
commit
3be36675d4
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@ -7,7 +7,7 @@
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: erase.c,v 1.66 2004/11/16 20:36:11 dwmw2 Exp $
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* $Id: erase.c,v 1.70 2005/02/09 09:09:01 pavlov Exp $
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*
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*/
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@ -233,7 +233,7 @@ static inline void jffs2_remove_node_refs_from_ino_list(struct jffs2_sb_info *c,
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continue;
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}
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if (((*prev)->flash_offset & ~(c->sector_size -1)) == jeb->offset) {
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if (SECTOR_ADDR((*prev)->flash_offset) == jeb->offset) {
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/* It's in the block we're erasing */
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struct jffs2_raw_node_ref *this;
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@ -7,7 +7,7 @@
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: gc.c,v 1.144 2004/12/21 11:18:50 dwmw2 Exp $
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* $Id: gc.c,v 1.145 2005/02/09 09:09:01 pavlov Exp $
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*
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*/
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@ -816,8 +816,7 @@ static int jffs2_garbage_collect_deletion_dirent(struct jffs2_sb_info *c, struct
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/* Doesn't matter if there's one in the same erase block. We're going to
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delete it too at the same time. */
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if ((raw->flash_offset & ~(c->sector_size-1)) ==
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(fd->raw->flash_offset & ~(c->sector_size-1)))
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if (SECTOR_ADDR(raw->flash_offset) == SECTOR_ADDR(fd->raw->flash_offset))
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continue;
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D1(printk(KERN_DEBUG "Check potential deletion dirent at %08x\n", ref_offset(raw)));
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@ -7,7 +7,7 @@
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: os-linux.h,v 1.51 2004/11/16 20:36:11 dwmw2 Exp $
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* $Id: os-linux.h,v 1.52 2005/02/09 09:09:01 pavlov Exp $
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*
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*/
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@ -97,7 +97,10 @@ static inline void jffs2_init_inode_info(struct jffs2_inode_info *f)
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#endif
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}
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#define SECTOR_ADDR(x) ( ((unsigned long)(x) & ~(c->sector_size-1)) )
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#define jffs2_is_readonly(c) (OFNI_BS_2SFFJ(c)->s_flags & MS_RDONLY)
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#define jffs2_is_writebuffered(c) (c->wbuf != NULL)
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#if (!defined CONFIG_JFFS2_FS_NAND && !defined CONFIG_JFFS2_FS_NOR_ECC)
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#define jffs2_can_mark_obsolete(c) (1)
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@ -7,7 +7,7 @@
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: scan.c,v 1.115 2004/11/17 12:59:08 dedekind Exp $
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* $Id: scan.c,v 1.116 2005/02/09 09:09:02 pavlov Exp $
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*
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*/
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#include <linux/kernel.h>
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@ -19,7 +19,7 @@
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#include <linux/compiler.h>
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#include "nodelist.h"
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#define EMPTY_SCAN_SIZE 1024
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#define DEFAULT_EMPTY_SCAN_SIZE 1024
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#define DIRTY_SPACE(x) do { typeof(x) _x = (x); \
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c->free_size -= _x; c->dirty_size += _x; \
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@ -75,6 +75,14 @@ static inline int min_free(struct jffs2_sb_info *c)
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return min;
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}
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static inline uint32_t EMPTY_SCAN_SIZE(uint32_t sector_size) {
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if (sector_size < DEFAULT_EMPTY_SCAN_SIZE)
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return sector_size;
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else
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return DEFAULT_EMPTY_SCAN_SIZE;
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}
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int jffs2_scan_medium(struct jffs2_sb_info *c)
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{
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int i, ret;
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@ -316,7 +324,7 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
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if (!buf_size) {
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buf_len = c->sector_size;
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} else {
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buf_len = EMPTY_SCAN_SIZE;
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buf_len = EMPTY_SCAN_SIZE(c->sector_size);
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err = jffs2_fill_scan_buf(c, buf, buf_ofs, buf_len);
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if (err)
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return err;
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@ -326,10 +334,10 @@ static int jffs2_scan_eraseblock (struct jffs2_sb_info *c, struct jffs2_eraseblo
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ofs = 0;
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/* Scan only 4KiB of 0xFF before declaring it's empty */
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while(ofs < EMPTY_SCAN_SIZE && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
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while(ofs < EMPTY_SCAN_SIZE(c->sector_size) && *(uint32_t *)(&buf[ofs]) == 0xFFFFFFFF)
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ofs += 4;
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if (ofs == EMPTY_SCAN_SIZE) {
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if (ofs == EMPTY_SCAN_SIZE(c->sector_size)) {
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#ifdef CONFIG_JFFS2_FS_NAND
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if (jffs2_cleanmarker_oob(c)) {
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/* scan oob, take care of cleanmarker */
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@ -423,7 +431,7 @@ scan_more:
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bail now */
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if (buf_ofs == jeb->offset && jeb->used_size == PAD(c->cleanmarker_size) &&
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c->cleanmarker_size && !jeb->dirty_size && !jeb->first_node->next_in_ino) {
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D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE));
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D1(printk(KERN_DEBUG "%d bytes at start of block seems clean... assuming all clean\n", EMPTY_SCAN_SIZE(c->sector_size)));
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return BLK_STATE_CLEANMARKER;
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}
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@ -9,7 +9,7 @@
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*
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* For licensing information, see the file 'LICENCE' in this directory.
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*
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* $Id: wbuf.c,v 1.86 2005/02/05 18:23:37 hammache Exp $
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* $Id: wbuf.c,v 1.87 2005/02/09 09:09:02 pavlov Exp $
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*
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*/
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@ -415,9 +415,9 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
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int ret;
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size_t retlen;
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/* Nothing to do if not NAND flash. In particular, we shouldn't
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/* Nothing to do if not write-buffering the flash. In particular, we shouldn't
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del_timer() the timer we never initialised. */
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if (jffs2_can_mark_obsolete(c))
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if (!jffs2_is_writebuffered(c))
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return 0;
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if (!down_trylock(&c->alloc_sem)) {
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@ -426,7 +426,7 @@ static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
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BUG();
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}
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if(!c->wbuf || !c->wbuf_len)
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if (!c->wbuf_len) /* already checked c->wbuf above */
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return 0;
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/* claim remaining space on the page
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@ -620,7 +620,7 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
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uint32_t outvec_to = to;
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/* If not NAND flash, don't bother */
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if (!c->wbuf)
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if (!jffs2_is_writebuffered(c))
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return jffs2_flash_direct_writev(c, invecs, count, to, retlen);
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down_write(&c->wbuf_sem);
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@ -649,7 +649,7 @@ int jffs2_flash_writev(struct jffs2_sb_info *c, const struct kvec *invecs, unsig
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erase block. Anything else, and you die.
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New block starts at xxx000c (0-b = block header)
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*/
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if ( (to & ~(c->sector_size-1)) != (c->wbuf_ofs & ~(c->sector_size-1)) ) {
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if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) {
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/* It's a write to a new block */
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if (c->wbuf_len) {
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D1(printk(KERN_DEBUG "jffs2_flash_writev() to 0x%lx causes flush of wbuf at 0x%08x\n", (unsigned long)to, c->wbuf_ofs));
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@ -847,7 +847,7 @@ int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *r
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{
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struct kvec vecs[1];
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if (jffs2_can_mark_obsolete(c))
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if (!jffs2_is_writebuffered(c))
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return c->mtd->write(c->mtd, ofs, len, retlen, buf);
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vecs[0].iov_base = (unsigned char *) buf;
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@ -863,38 +863,37 @@ int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *re
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loff_t orbf = 0, owbf = 0, lwbf = 0;
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int ret;
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/* Read flash */
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if (!jffs2_can_mark_obsolete(c)) {
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if (jffs2_cleanmarker_oob(c))
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ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo);
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else
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ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);
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if ( (ret == -EBADMSG) && (*retlen == len) ) {
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printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n",
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len, ofs);
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/*
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* We have the raw data without ECC correction in the buffer, maybe
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* we are lucky and all data or parts are correct. We check the node.
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* If data are corrupted node check will sort it out.
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* We keep this block, it will fail on write or erase and the we
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* mark it bad. Or should we do that now? But we should give him a chance.
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* Maybe we had a system crash or power loss before the ecc write or
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* a erase was completed.
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* So we return success. :)
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*/
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ret = 0;
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}
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} else
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if (!jffs2_is_writebuffered(c))
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return c->mtd->read(c->mtd, ofs, len, retlen, buf);
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/* Read flash */
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if (jffs2_cleanmarker_oob(c))
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ret = c->mtd->read_ecc(c->mtd, ofs, len, retlen, buf, NULL, c->oobinfo);
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else
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ret = c->mtd->read(c->mtd, ofs, len, retlen, buf);
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if ( (ret == -EBADMSG) && (*retlen == len) ) {
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printk(KERN_WARNING "mtd->read(0x%zx bytes from 0x%llx) returned ECC error\n",
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len, ofs);
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/*
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* We have the raw data without ECC correction in the buffer, maybe
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* we are lucky and all data or parts are correct. We check the node.
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* If data are corrupted node check will sort it out.
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* We keep this block, it will fail on write or erase and the we
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* mark it bad. Or should we do that now? But we should give him a chance.
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* Maybe we had a system crash or power loss before the ecc write or
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* a erase was completed.
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* So we return success. :)
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*/
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ret = 0;
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}
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/* if no writebuffer available or write buffer empty, return */
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if (!c->wbuf_pagesize || !c->wbuf_len)
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return ret;;
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/* if we read in a different block, return */
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if ( (ofs & ~(c->sector_size-1)) != (c->wbuf_ofs & ~(c->sector_size-1)) )
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if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs))
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return ret;
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/* Lock only if we have reason to believe wbuf contains relevant data,
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