[rtems commit] cpukit/jffs2: Import wbuf.c from upstream
Joel Sherrill
joel at rtems.org
Wed Mar 15 18:11:53 UTC 2023
Module: rtems
Branch: master
Commit: 5635ec33623a92932879a1e53a05ae328ad62223
Changeset: http://git.rtems.org/rtems/commit/?id=5635ec33623a92932879a1e53a05ae328ad62223
Author: Kinsey Moore <kinsey.moore at oarcorp.com>
Date: Fri Dec 23 11:56:03 2022 -0600
cpukit/jffs2: Import wbuf.c from upstream
This pulls in wbuf.c from the upstream Linux repository at the state
specified in VERSION.
---
cpukit/libfs/src/jffs2/VERSION | 1 +
cpukit/libfs/src/jffs2/src/wbuf.c | 1350 +++++++++++++++++++++++++++++++++++++
2 files changed, 1351 insertions(+)
diff --git a/cpukit/libfs/src/jffs2/VERSION b/cpukit/libfs/src/jffs2/VERSION
index b2d9e654bf..7302f10ef6 100644
--- a/cpukit/libfs/src/jffs2/VERSION
+++ b/cpukit/libfs/src/jffs2/VERSION
@@ -26,6 +26,7 @@ generate the relevant patches:
fs/jffs2/readinode.c \
fs/jffs2/scan.c \
fs/jffs2/summary.h \
+ fs/jffs2/wbuf.c \
fs/jffs2/write.c \
fs/jffs2/xattr.h
diff --git a/cpukit/libfs/src/jffs2/src/wbuf.c b/cpukit/libfs/src/jffs2/src/wbuf.c
new file mode 100644
index 0000000000..2e939c5ef0
--- /dev/null
+++ b/cpukit/libfs/src/jffs2/src/wbuf.c
@@ -0,0 +1,1350 @@
+/*
+ * JFFS2 -- Journalling Flash File System, Version 2.
+ *
+ * Copyright © 2001-2007 Red Hat, Inc.
+ * Copyright © 2004 Thomas Gleixner <tglx at linutronix.de>
+ *
+ * Created by David Woodhouse <dwmw2 at infradead.org>
+ * Modified debugged and enhanced by Thomas Gleixner <tglx at linutronix.de>
+ *
+ * For licensing information, see the file 'LICENCE' in this directory.
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/crc32.h>
+#include <linux/mtd/rawnand.h>
+#include <linux/jiffies.h>
+#include <linux/sched.h>
+#include <linux/writeback.h>
+
+#include "nodelist.h"
+
+/* For testing write failures */
+#undef BREAKME
+#undef BREAKMEHEADER
+
+#ifdef BREAKME
+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
+
+struct jffs2_inodirty {
+ uint32_t ino;
+ struct jffs2_inodirty *next;
+};
+
+static struct jffs2_inodirty inodirty_nomem;
+
+static int jffs2_wbuf_pending_for_ino(struct jffs2_sb_info *c, uint32_t ino)
+{
+ struct jffs2_inodirty *this = c->wbuf_inodes;
+
+ /* If a malloc failed, consider _everything_ dirty */
+ if (this == &inodirty_nomem)
+ return 1;
+
+ /* If ino == 0, _any_ non-GC writes mean 'yes' */
+ if (this && !ino)
+ return 1;
+
+ /* Look to see if the inode in question is pending in the wbuf */
+ while (this) {
+ if (this->ino == ino)
+ return 1;
+ this = this->next;
+ }
+ return 0;
+}
+
+static void jffs2_clear_wbuf_ino_list(struct jffs2_sb_info *c)
+{
+ struct jffs2_inodirty *this;
+
+ this = c->wbuf_inodes;
+
+ if (this != &inodirty_nomem) {
+ while (this) {
+ struct jffs2_inodirty *next = this->next;
+ kfree(this);
+ this = next;
+ }
+ }
+ c->wbuf_inodes = NULL;
+}
+
+static void jffs2_wbuf_dirties_inode(struct jffs2_sb_info *c, uint32_t ino)
+{
+ struct jffs2_inodirty *new;
+
+ /* Schedule delayed write-buffer write-out */
+ jffs2_dirty_trigger(c);
+
+ if (jffs2_wbuf_pending_for_ino(c, ino))
+ return;
+
+ new = kmalloc(sizeof(*new), GFP_KERNEL);
+ if (!new) {
+ jffs2_dbg(1, "No memory to allocate inodirty. Fallback to all considered dirty\n");
+ jffs2_clear_wbuf_ino_list(c);
+ c->wbuf_inodes = &inodirty_nomem;
+ return;
+ }
+ new->ino = ino;
+ new->next = c->wbuf_inodes;
+ c->wbuf_inodes = new;
+ return;
+}
+
+static inline void jffs2_refile_wbuf_blocks(struct jffs2_sb_info *c)
+{
+ struct list_head *this, *next;
+ static int n;
+
+ if (list_empty(&c->erasable_pending_wbuf_list))
+ return;
+
+ list_for_each_safe(this, next, &c->erasable_pending_wbuf_list) {
+ struct jffs2_eraseblock *jeb = list_entry(this, struct jffs2_eraseblock, list);
+
+ jffs2_dbg(1, "Removing eraseblock at 0x%08x from erasable_pending_wbuf_list...\n",
+ jeb->offset);
+ list_del(this);
+ if ((jiffies + (n++)) & 127) {
+ /* Most of the time, we just erase it immediately. Otherwise we
+ spend ages scanning it on mount, etc. */
+ jffs2_dbg(1, "...and adding to erase_pending_list\n");
+ list_add_tail(&jeb->list, &c->erase_pending_list);
+ c->nr_erasing_blocks++;
+ jffs2_garbage_collect_trigger(c);
+ } else {
+ /* Sometimes, however, we leave it elsewhere so it doesn't get
+ immediately reused, and we spread the load a bit. */
+ jffs2_dbg(1, "...and adding to erasable_list\n");
+ list_add_tail(&jeb->list, &c->erasable_list);
+ }
+ }
+}
+
+#define REFILE_NOTEMPTY 0
+#define REFILE_ANYWAY 1
+
+static void jffs2_block_refile(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, int allow_empty)
+{
+ jffs2_dbg(1, "About to refile bad block at %08x\n", jeb->offset);
+
+ /* File the existing block on the bad_used_list.... */
+ if (c->nextblock == jeb)
+ c->nextblock = NULL;
+ else /* Not sure this should ever happen... need more coffee */
+ list_del(&jeb->list);
+ if (jeb->first_node) {
+ jffs2_dbg(1, "Refiling block at %08x to bad_used_list\n",
+ jeb->offset);
+ list_add(&jeb->list, &c->bad_used_list);
+ } else {
+ BUG_ON(allow_empty == REFILE_NOTEMPTY);
+ /* It has to have had some nodes or we couldn't be here */
+ jffs2_dbg(1, "Refiling block at %08x to erase_pending_list\n",
+ jeb->offset);
+ list_add(&jeb->list, &c->erase_pending_list);
+ c->nr_erasing_blocks++;
+ jffs2_garbage_collect_trigger(c);
+ }
+
+ if (!jffs2_prealloc_raw_node_refs(c, jeb, 1)) {
+ uint32_t oldfree = jeb->free_size;
+
+ jffs2_link_node_ref(c, jeb,
+ (jeb->offset+c->sector_size-oldfree) | REF_OBSOLETE,
+ oldfree, NULL);
+ /* convert to wasted */
+ c->wasted_size += oldfree;
+ jeb->wasted_size += oldfree;
+ c->dirty_size -= oldfree;
+ jeb->dirty_size -= oldfree;
+ }
+
+ jffs2_dbg_dump_block_lists_nolock(c);
+ jffs2_dbg_acct_sanity_check_nolock(c,jeb);
+ jffs2_dbg_acct_paranoia_check_nolock(c, jeb);
+}
+
+static struct jffs2_raw_node_ref **jffs2_incore_replace_raw(struct jffs2_sb_info *c,
+ struct jffs2_inode_info *f,
+ struct jffs2_raw_node_ref *raw,
+ union jffs2_node_union *node)
+{
+ struct jffs2_node_frag *frag;
+ struct jffs2_full_dirent *fd;
+
+ dbg_noderef("incore_replace_raw: node at %p is {%04x,%04x}\n",
+ node, je16_to_cpu(node->u.magic), je16_to_cpu(node->u.nodetype));
+
+ BUG_ON(je16_to_cpu(node->u.magic) != 0x1985 &&
+ je16_to_cpu(node->u.magic) != 0);
+
+ switch (je16_to_cpu(node->u.nodetype)) {
+ case JFFS2_NODETYPE_INODE:
+ if (f->metadata && f->metadata->raw == raw) {
+ dbg_noderef("Will replace ->raw in f->metadata at %p\n", f->metadata);
+ return &f->metadata->raw;
+ }
+ frag = jffs2_lookup_node_frag(&f->fragtree, je32_to_cpu(node->i.offset));
+ BUG_ON(!frag);
+ /* Find a frag which refers to the full_dnode we want to modify */
+ while (!frag->node || frag->node->raw != raw) {
+ frag = frag_next(frag);
+ BUG_ON(!frag);
+ }
+ dbg_noderef("Will replace ->raw in full_dnode at %p\n", frag->node);
+ return &frag->node->raw;
+
+ case JFFS2_NODETYPE_DIRENT:
+ for (fd = f->dents; fd; fd = fd->next) {
+ if (fd->raw == raw) {
+ dbg_noderef("Will replace ->raw in full_dirent at %p\n", fd);
+ return &fd->raw;
+ }
+ }
+ BUG();
+
+ default:
+ dbg_noderef("Don't care about replacing raw for nodetype %x\n",
+ je16_to_cpu(node->u.nodetype));
+ break;
+ }
+ return NULL;
+}
+
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+static int jffs2_verify_write(struct jffs2_sb_info *c, unsigned char *buf,
+ uint32_t ofs)
+{
+ int ret;
+ size_t retlen;
+ char *eccstr;
+
+ ret = mtd_read(c->mtd, ofs, c->wbuf_pagesize, &retlen, c->wbuf_verify);
+ if (ret && ret != -EUCLEAN && ret != -EBADMSG) {
+ pr_warn("%s(): Read back of page at %08x failed: %d\n",
+ __func__, c->wbuf_ofs, ret);
+ return ret;
+ } else if (retlen != c->wbuf_pagesize) {
+ pr_warn("%s(): Read back of page at %08x gave short read: %zd not %d\n",
+ __func__, ofs, retlen, c->wbuf_pagesize);
+ return -EIO;
+ }
+ if (!memcmp(buf, c->wbuf_verify, c->wbuf_pagesize))
+ return 0;
+
+ if (ret == -EUCLEAN)
+ eccstr = "corrected";
+ else if (ret == -EBADMSG)
+ eccstr = "correction failed";
+ else
+ eccstr = "OK or unused";
+
+ pr_warn("Write verify error (ECC %s) at %08x. Wrote:\n",
+ eccstr, c->wbuf_ofs);
+ print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1,
+ c->wbuf, c->wbuf_pagesize, 0);
+
+ pr_warn("Read back:\n");
+ print_hex_dump(KERN_WARNING, "", DUMP_PREFIX_OFFSET, 16, 1,
+ c->wbuf_verify, c->wbuf_pagesize, 0);
+
+ return -EIO;
+}
+#else
+#define jffs2_verify_write(c,b,o) (0)
+#endif
+
+/* Recover from failure to write wbuf. Recover the nodes up to the
+ * wbuf, not the one which we were starting to try to write. */
+
+static void jffs2_wbuf_recover(struct jffs2_sb_info *c)
+{
+ struct jffs2_eraseblock *jeb, *new_jeb;
+ struct jffs2_raw_node_ref *raw, *next, *first_raw = NULL;
+ size_t retlen;
+ int ret;
+ int nr_refile = 0;
+ unsigned char *buf;
+ uint32_t start, end, ofs, len;
+
+ jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
+
+ spin_lock(&c->erase_completion_lock);
+ if (c->wbuf_ofs % c->mtd->erasesize)
+ jffs2_block_refile(c, jeb, REFILE_NOTEMPTY);
+ else
+ jffs2_block_refile(c, jeb, REFILE_ANYWAY);
+ spin_unlock(&c->erase_completion_lock);
+
+ BUG_ON(!ref_obsolete(jeb->last_node));
+
+ /* Find the first node to be recovered, by skipping over every
+ node which ends before the wbuf starts, or which is obsolete. */
+ for (next = raw = jeb->first_node; next; raw = next) {
+ next = ref_next(raw);
+
+ if (ref_obsolete(raw) ||
+ (next && ref_offset(next) <= c->wbuf_ofs)) {
+ dbg_noderef("Skipping node at 0x%08x(%d)-0x%08x which is either before 0x%08x or obsolete\n",
+ ref_offset(raw), ref_flags(raw),
+ (ref_offset(raw) + ref_totlen(c, jeb, raw)),
+ c->wbuf_ofs);
+ continue;
+ }
+ dbg_noderef("First node to be recovered is at 0x%08x(%d)-0x%08x\n",
+ ref_offset(raw), ref_flags(raw),
+ (ref_offset(raw) + ref_totlen(c, jeb, raw)));
+
+ first_raw = raw;
+ break;
+ }
+
+ if (!first_raw) {
+ /* All nodes were obsolete. Nothing to recover. */
+ jffs2_dbg(1, "No non-obsolete nodes to be recovered. Just filing block bad\n");
+ c->wbuf_len = 0;
+ return;
+ }
+
+ start = ref_offset(first_raw);
+ end = ref_offset(jeb->last_node);
+ nr_refile = 1;
+
+ /* Count the number of refs which need to be copied */
+ while ((raw = ref_next(raw)) != jeb->last_node)
+ nr_refile++;
+
+ dbg_noderef("wbuf recover %08x-%08x (%d bytes in %d nodes)\n",
+ start, end, end - start, nr_refile);
+
+ buf = NULL;
+ if (start < c->wbuf_ofs) {
+ /* First affected node was already partially written.
+ * Attempt to reread the old data into our buffer. */
+
+ buf = kmalloc(end - start, GFP_KERNEL);
+ if (!buf) {
+ pr_crit("Malloc failure in wbuf recovery. Data loss ensues.\n");
+
+ goto read_failed;
+ }
+
+ /* Do the read... */
+ ret = mtd_read(c->mtd, start, c->wbuf_ofs - start, &retlen,
+ buf);
+
+ /* ECC recovered ? */
+ if ((ret == -EUCLEAN || ret == -EBADMSG) &&
+ (retlen == c->wbuf_ofs - start))
+ ret = 0;
+
+ if (ret || retlen != c->wbuf_ofs - start) {
+ pr_crit("Old data are already lost in wbuf recovery. Data loss ensues.\n");
+
+ kfree(buf);
+ buf = NULL;
+ read_failed:
+ first_raw = ref_next(first_raw);
+ nr_refile--;
+ while (first_raw && ref_obsolete(first_raw)) {
+ first_raw = ref_next(first_raw);
+ nr_refile--;
+ }
+
+ /* If this was the only node to be recovered, give up */
+ if (!first_raw) {
+ c->wbuf_len = 0;
+ return;
+ }
+
+ /* It wasn't. Go on and try to recover nodes complete in the wbuf */
+ start = ref_offset(first_raw);
+ dbg_noderef("wbuf now recover %08x-%08x (%d bytes in %d nodes)\n",
+ start, end, end - start, nr_refile);
+
+ } else {
+ /* Read succeeded. Copy the remaining data from the wbuf */
+ memcpy(buf + (c->wbuf_ofs - start), c->wbuf, end - c->wbuf_ofs);
+ }
+ }
+ /* OK... we're to rewrite (end-start) bytes of data from first_raw onwards.
+ Either 'buf' contains the data, or we find it in the wbuf */
+
+ /* ... and get an allocation of space from a shiny new block instead */
+ ret = jffs2_reserve_space_gc(c, end-start, &len, JFFS2_SUMMARY_NOSUM_SIZE);
+ if (ret) {
+ pr_warn("Failed to allocate space for wbuf recovery. Data loss ensues.\n");
+ kfree(buf);
+ return;
+ }
+
+ /* The summary is not recovered, so it must be disabled for this erase block */
+ jffs2_sum_disable_collecting(c->summary);
+
+ ret = jffs2_prealloc_raw_node_refs(c, c->nextblock, nr_refile);
+ if (ret) {
+ pr_warn("Failed to allocate node refs for wbuf recovery. Data loss ensues.\n");
+ kfree(buf);
+ return;
+ }
+
+ ofs = write_ofs(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
+ from. */
+ unsigned char *rewrite_buf = buf?:c->wbuf;
+ uint32_t towrite = (end-start) - ((end-start)%c->wbuf_pagesize);
+
+ jffs2_dbg(1, "Write 0x%x bytes at 0x%08x in wbuf recover\n",
+ towrite, ofs);
+
+#ifdef BREAKMEHEADER
+ static int breakme;
+ if (breakme++ == 20) {
+ pr_notice("Faking write error at 0x%08x\n", ofs);
+ breakme = 0;
+ mtd_write(c->mtd, ofs, towrite, &retlen, brokenbuf);
+ ret = -EIO;
+ } else
+#endif
+ ret = mtd_write(c->mtd, ofs, towrite, &retlen,
+ rewrite_buf);
+
+ if (ret || retlen != towrite || jffs2_verify_write(c, rewrite_buf, ofs)) {
+ /* Argh. We tried. Really we did. */
+ pr_crit("Recovery of wbuf failed due to a second write error\n");
+ kfree(buf);
+
+ if (retlen)
+ jffs2_add_physical_node_ref(c, ofs | REF_OBSOLETE, ref_totlen(c, jeb, first_raw), NULL);
+
+ return;
+ }
+ pr_notice("Recovery of wbuf succeeded to %08x\n", ofs);
+
+ c->wbuf_len = (end - start) - towrite;
+ 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. */
+ } else {
+ /* OK, now we're left with the dregs in whichever buffer we're using */
+ if (buf) {
+ memcpy(c->wbuf, buf, end-start);
+ } else {
+ memmove(c->wbuf, c->wbuf + (start - c->wbuf_ofs), end - start);
+ }
+ c->wbuf_ofs = ofs;
+ c->wbuf_len = end - start;
+ }
+
+ /* Now sort out the jffs2_raw_node_refs, moving them from the old to the next block */
+ new_jeb = &c->blocks[ofs / c->sector_size];
+
+ spin_lock(&c->erase_completion_lock);
+ for (raw = first_raw; raw != jeb->last_node; raw = ref_next(raw)) {
+ uint32_t rawlen = ref_totlen(c, jeb, raw);
+ struct jffs2_inode_cache *ic;
+ struct jffs2_raw_node_ref *new_ref;
+ struct jffs2_raw_node_ref **adjust_ref = NULL;
+ struct jffs2_inode_info *f = NULL;
+
+ jffs2_dbg(1, "Refiling block of %08x at %08x(%d) to %08x\n",
+ rawlen, ref_offset(raw), ref_flags(raw), ofs);
+
+ ic = jffs2_raw_ref_to_ic(raw);
+
+ /* Ick. This XATTR mess should be fixed shortly... */
+ if (ic && ic->class == RAWNODE_CLASS_XATTR_DATUM) {
+ struct jffs2_xattr_datum *xd = (void *)ic;
+ BUG_ON(xd->node != raw);
+ adjust_ref = &xd->node;
+ raw->next_in_ino = NULL;
+ ic = NULL;
+ } else if (ic && ic->class == RAWNODE_CLASS_XATTR_REF) {
+ struct jffs2_xattr_datum *xr = (void *)ic;
+ BUG_ON(xr->node != raw);
+ adjust_ref = &xr->node;
+ raw->next_in_ino = NULL;
+ ic = NULL;
+ } else if (ic && ic->class == RAWNODE_CLASS_INODE_CACHE) {
+ struct jffs2_raw_node_ref **p = &ic->nodes;
+
+ /* Remove the old node from the per-inode list */
+ while (*p && *p != (void *)ic) {
+ if (*p == raw) {
+ (*p) = (raw->next_in_ino);
+ raw->next_in_ino = NULL;
+ break;
+ }
+ p = &((*p)->next_in_ino);
+ }
+
+ if (ic->state == INO_STATE_PRESENT && !ref_obsolete(raw)) {
+ /* If it's an in-core inode, then we have to adjust any
+ full_dirent or full_dnode structure to point to the
+ new version instead of the old */
+ f = jffs2_gc_fetch_inode(c, ic->ino, !ic->pino_nlink);
+ if (IS_ERR(f)) {
+ /* Should never happen; it _must_ be present */
+ JFFS2_ERROR("Failed to iget() ino #%u, err %ld\n",
+ ic->ino, PTR_ERR(f));
+ BUG();
+ }
+ /* We don't lock f->sem. There's a number of ways we could
+ end up in here with it already being locked, and nobody's
+ going to modify it on us anyway because we hold the
+ alloc_sem. We're only changing one ->raw pointer too,
+ which we can get away with without upsetting readers. */
+ adjust_ref = jffs2_incore_replace_raw(c, f, raw,
+ (void *)(buf?:c->wbuf) + (ref_offset(raw) - start));
+ } else if (unlikely(ic->state != INO_STATE_PRESENT &&
+ ic->state != INO_STATE_CHECKEDABSENT &&
+ ic->state != INO_STATE_GC)) {
+ JFFS2_ERROR("Inode #%u is in strange state %d!\n", ic->ino, ic->state);
+ BUG();
+ }
+ }
+
+ new_ref = jffs2_link_node_ref(c, new_jeb, ofs | ref_flags(raw), rawlen, ic);
+
+ if (adjust_ref) {
+ BUG_ON(*adjust_ref != raw);
+ *adjust_ref = new_ref;
+ }
+ if (f)
+ jffs2_gc_release_inode(c, f);
+
+ if (!ref_obsolete(raw)) {
+ jeb->dirty_size += rawlen;
+ jeb->used_size -= rawlen;
+ c->dirty_size += rawlen;
+ c->used_size -= rawlen;
+ raw->flash_offset = ref_offset(raw) | REF_OBSOLETE;
+ BUG_ON(raw->next_in_ino);
+ }
+ ofs += rawlen;
+ }
+
+ kfree(buf);
+
+ /* Fix up the original jeb now it's on the bad_list */
+ if (first_raw == jeb->first_node) {
+ jffs2_dbg(1, "Failing block at %08x is now empty. Moving to erase_pending_list\n",
+ jeb->offset);
+ list_move(&jeb->list, &c->erase_pending_list);
+ c->nr_erasing_blocks++;
+ jffs2_garbage_collect_trigger(c);
+ }
+
+ jffs2_dbg_acct_sanity_check_nolock(c, jeb);
+ jffs2_dbg_acct_paranoia_check_nolock(c, 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);
+
+ jffs2_dbg(1, "wbuf recovery completed OK. wbuf_ofs 0x%08x, len 0x%x\n",
+ c->wbuf_ofs, c->wbuf_len);
+
+}
+
+/* Meaning of pad argument:
+ 0: Do not pad. Probably pointless - we only ever use this when we can't pad anyway.
+ 1: Pad, do not adjust nextblock free_size
+ 2: Pad, adjust nextblock free_size
+*/
+#define NOPAD 0
+#define PAD_NOACCOUNT 1
+#define PAD_ACCOUNTING 2
+
+static int __jffs2_flush_wbuf(struct jffs2_sb_info *c, int pad)
+{
+ struct jffs2_eraseblock *wbuf_jeb;
+ int ret;
+ size_t retlen;
+
+ /* Nothing to do if not write-buffering the flash. In particular, we shouldn't
+ del_timer() the timer we never initialised. */
+ if (!jffs2_is_writebuffered(c))
+ return 0;
+
+ if (!mutex_is_locked(&c->alloc_sem)) {
+ pr_crit("jffs2_flush_wbuf() called with alloc_sem not locked!\n");
+ BUG();
+ }
+
+ if (!c->wbuf_len) /* already checked c->wbuf above */
+ return 0;
+
+ wbuf_jeb = &c->blocks[c->wbuf_ofs / c->sector_size];
+ if (jffs2_prealloc_raw_node_refs(c, wbuf_jeb, c->nextblock->allocated_refs + 1))
+ return -ENOMEM;
+
+ /* claim remaining space on the page
+ 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.
+ */
+ 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);
+ padnode->nodetype = cpu_to_je16(JFFS2_NODETYPE_PADDING);
+ padnode->totlen = cpu_to_je32(c->wbuf_pagesize - c->wbuf_len);
+ padnode->hdr_crc = cpu_to_je32(crc32(0, padnode, sizeof(*padnode)-4));
+ }
+ }
+ /* 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) {
+ pr_notice("Faking write error at 0x%08x\n", c->wbuf_ofs);
+ breakme = 0;
+ mtd_write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize, &retlen,
+ brokenbuf);
+ ret = -EIO;
+ } else
+#endif
+
+ ret = mtd_write(c->mtd, c->wbuf_ofs, c->wbuf_pagesize,
+ &retlen, c->wbuf);
+
+ if (ret) {
+ pr_warn("jffs2_flush_wbuf(): Write failed with %d\n", ret);
+ goto wfail;
+ } else if (retlen != c->wbuf_pagesize) {
+ pr_warn("jffs2_flush_wbuf(): Write was short: %zd instead of %d\n",
+ retlen, c->wbuf_pagesize);
+ ret = -EIO;
+ goto wfail;
+ } else if ((ret = jffs2_verify_write(c, c->wbuf, c->wbuf_ofs))) {
+ wfail:
+ jffs2_wbuf_recover(c);
+
+ return ret;
+ }
+
+ /* Adjust free size of the block if we padded. */
+ if (pad) {
+ uint32_t waste = c->wbuf_pagesize - c->wbuf_len;
+
+ jffs2_dbg(1, "jffs2_flush_wbuf() adjusting free_size of %sblock at %08x\n",
+ (wbuf_jeb == c->nextblock) ? "next" : "",
+ wbuf_jeb->offset);
+
+ /* 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 (wbuf_jeb->free_size < waste) {
+ pr_crit("jffs2_flush_wbuf(): Accounting error. wbuf at 0x%08x has 0x%03x bytes, 0x%03x left.\n",
+ c->wbuf_ofs, c->wbuf_len, waste);
+ pr_crit("jffs2_flush_wbuf(): But free_size for block at 0x%08x is only 0x%08x\n",
+ wbuf_jeb->offset, wbuf_jeb->free_size);
+ BUG();
+ }
+
+ spin_lock(&c->erase_completion_lock);
+
+ jffs2_link_node_ref(c, wbuf_jeb, (c->wbuf_ofs + c->wbuf_len) | REF_OBSOLETE, waste, NULL);
+ /* FIXME: that made it count as dirty. Convert to wasted */
+ wbuf_jeb->dirty_size -= waste;
+ c->dirty_size -= waste;
+ wbuf_jeb->wasted_size += waste;
+ c->wasted_size += waste;
+ } else
+ spin_lock(&c->erase_completion_lock);
+
+ /* Stick any now-obsoleted blocks on the erase_pending_list */
+ jffs2_refile_wbuf_blocks(c);
+ jffs2_clear_wbuf_ino_list(c);
+ spin_unlock(&c->erase_completion_lock);
+
+ memset(c->wbuf,0xff,c->wbuf_pagesize);
+ /* adjust write buffer offset, else we get a non contiguous write bug */
+ c->wbuf_ofs += c->wbuf_pagesize;
+ c->wbuf_len = 0;
+ return 0;
+}
+
+/* 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
+ given inode is outstanding. */
+int jffs2_flush_wbuf_gc(struct jffs2_sb_info *c, uint32_t ino)
+{
+ uint32_t old_wbuf_ofs;
+ uint32_t old_wbuf_len;
+ int ret = 0;
+
+ jffs2_dbg(1, "jffs2_flush_wbuf_gc() called for ino #%u...\n", ino);
+
+ if (!c->wbuf)
+ return 0;
+
+ mutex_lock(&c->alloc_sem);
+ if (!jffs2_wbuf_pending_for_ino(c, ino)) {
+ jffs2_dbg(1, "Ino #%d not pending in wbuf. Returning\n", ino);
+ mutex_unlock(&c->alloc_sem);
+ return 0;
+ }
+
+ old_wbuf_ofs = c->wbuf_ofs;
+ old_wbuf_len = c->wbuf_len;
+
+ if (c->unchecked_size) {
+ /* GC won't make any progress for a while */
+ jffs2_dbg(1, "%s(): padding. Not finished checking\n",
+ __func__);
+ down_write(&c->wbuf_sem);
+ ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
+ /* retry flushing wbuf in case jffs2_wbuf_recover
+ left some data in the wbuf */
+ if (ret)
+ ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
+ up_write(&c->wbuf_sem);
+ } else while (old_wbuf_len &&
+ old_wbuf_ofs == c->wbuf_ofs) {
+
+ mutex_unlock(&c->alloc_sem);
+
+ jffs2_dbg(1, "%s(): calls gc pass\n", __func__);
+
+ ret = jffs2_garbage_collect_pass(c);
+ if (ret) {
+ /* GC failed. Flush it with padding instead */
+ mutex_lock(&c->alloc_sem);
+ down_write(&c->wbuf_sem);
+ ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
+ /* retry flushing wbuf in case jffs2_wbuf_recover
+ left some data in the wbuf */
+ if (ret)
+ ret = __jffs2_flush_wbuf(c, PAD_ACCOUNTING);
+ up_write(&c->wbuf_sem);
+ break;
+ }
+ mutex_lock(&c->alloc_sem);
+ }
+
+ jffs2_dbg(1, "%s(): ends...\n", __func__);
+
+ mutex_unlock(&c->alloc_sem);
+ return ret;
+}
+
+/* Pad write-buffer to end and write it, wasting space. */
+int jffs2_flush_wbuf_pad(struct jffs2_sb_info *c)
+{
+ int ret;
+
+ if (!c->wbuf)
+ return 0;
+
+ down_write(&c->wbuf_sem);
+ ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
+ /* retry - maybe wbuf recover left some data in wbuf. */
+ if (ret)
+ ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
+ up_write(&c->wbuf_sem);
+
+ return ret;
+}
+
+static size_t jffs2_fill_wbuf(struct jffs2_sb_info *c, const uint8_t *buf,
+ size_t len)
+{
+ if (len && !c->wbuf_len && (len >= c->wbuf_pagesize))
+ return 0;
+
+ if (len > (c->wbuf_pagesize - c->wbuf_len))
+ len = c->wbuf_pagesize - c->wbuf_len;
+ memcpy(c->wbuf + c->wbuf_len, buf, len);
+ c->wbuf_len += (uint32_t) len;
+ return len;
+}
+
+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 jffs2_eraseblock *jeb;
+ size_t wbuf_retlen, donelen = 0;
+ uint32_t outvec_to = to;
+ int ret, invec;
+
+ /* If not writebuffered 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);
+ 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 erase block. Anything else,
+ * and you die. New block starts at xxx000c (0-b = block
+ * header)
+ */
+ if (SECTOR_ADDR(to) != SECTOR_ADDR(c->wbuf_ofs)) {
+ /* It's a write to a new block */
+ if (c->wbuf_len) {
+ jffs2_dbg(1, "%s(): to 0x%lx causes flush of wbuf at 0x%08x\n",
+ __func__, (unsigned long)to, c->wbuf_ofs);
+ ret = __jffs2_flush_wbuf(c, PAD_NOACCOUNT);
+ if (ret)
+ goto outerr;
+ }
+ /* set pointer to new block */
+ c->wbuf_ofs = PAGE_DIV(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. */
+ pr_crit("%s(): Non-contiguous write to %08lx\n",
+ __func__, (unsigned long)to);
+ if (c->wbuf_len)
+ pr_crit("wbuf was previously %08x-%08x\n",
+ c->wbuf_ofs, c->wbuf_ofs + c->wbuf_len);
+ BUG();
+ }
+
+ /* 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;
+ ret = __jffs2_flush_wbuf(c, NOPAD);
+ if (ret)
+ goto outerr;
+ }
+ }
+
+ for (invec = 0; invec < count; invec++) {
+ int vlen = invecs[invec].iov_len;
+ uint8_t *v = invecs[invec].iov_base;
+
+ wbuf_retlen = jffs2_fill_wbuf(c, v, vlen);
+
+ if (c->wbuf_len == c->wbuf_pagesize) {
+ ret = __jffs2_flush_wbuf(c, NOPAD);
+ if (ret)
+ goto outerr;
+ }
+ vlen -= wbuf_retlen;
+ outvec_to += wbuf_retlen;
+ donelen += wbuf_retlen;
+ v += wbuf_retlen;
+
+ if (vlen >= c->wbuf_pagesize) {
+ ret = mtd_write(c->mtd, outvec_to, PAGE_DIV(vlen),
+ &wbuf_retlen, v);
+ if (ret < 0 || wbuf_retlen != PAGE_DIV(vlen))
+ goto outfile;
+
+ vlen -= wbuf_retlen;
+ outvec_to += wbuf_retlen;
+ c->wbuf_ofs = outvec_to;
+ donelen += wbuf_retlen;
+ v += wbuf_retlen;
+ }
+
+ wbuf_retlen = jffs2_fill_wbuf(c, v, vlen);
+ if (c->wbuf_len == c->wbuf_pagesize) {
+ ret = __jffs2_flush_wbuf(c, NOPAD);
+ if (ret)
+ goto outerr;
+ }
+
+ outvec_to += wbuf_retlen;
+ donelen += wbuf_retlen;
+ }
+
+ /*
+ * If there's a remainder in the wbuf and it's a non-GC write,
+ * remember that the wbuf affects this ino
+ */
+ *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;
+ up_write(&c->wbuf_sem);
+ return ret;
+
+outfile:
+ /*
+ * At this point we have no problem, c->wbuf is empty. However
+ * refile nextblock to avoid writing again to same address.
+ */
+
+ spin_lock(&c->erase_completion_lock);
+
+ jeb = &c->blocks[outvec_to / c->sector_size];
+ jffs2_block_refile(c, jeb, REFILE_ANYWAY);
+
+ spin_unlock(&c->erase_completion_lock);
+
+outerr:
+ *retlen = 0;
+ up_write(&c->wbuf_sem);
+ return ret;
+}
+
+/*
+ * This is the entry for flash write.
+ * Check, if we work on NAND FLASH, if so build an kvec and write it via vritev
+*/
+int jffs2_flash_write(struct jffs2_sb_info *c, loff_t ofs, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ struct kvec vecs[1];
+
+ if (!jffs2_is_writebuffered(c))
+ return jffs2_flash_direct_write(c, ofs, len, retlen, buf);
+
+ vecs[0].iov_base = (unsigned char *) buf;
+ vecs[0].iov_len = len;
+ return jffs2_flash_writev(c, vecs, 1, ofs, retlen, 0);
+}
+
+/*
+ Handle readback from writebuffer and ECC failure return
+*/
+int jffs2_flash_read(struct jffs2_sb_info *c, loff_t ofs, size_t len, size_t *retlen, u_char *buf)
+{
+ loff_t orbf = 0, owbf = 0, lwbf = 0;
+ int ret;
+
+ if (!jffs2_is_writebuffered(c))
+ return mtd_read(c->mtd, ofs, len, retlen, buf);
+
+ /* Read flash */
+ down_read(&c->wbuf_sem);
+ ret = mtd_read(c->mtd, ofs, len, retlen, buf);
+
+ if ( (ret == -EBADMSG || ret == -EUCLEAN) && (*retlen == len) ) {
+ if (ret == -EBADMSG)
+ pr_warn("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 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 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)
+ goto exit;
+
+ /* if we read in a different block, return */
+ if (SECTOR_ADDR(ofs) != SECTOR_ADDR(c->wbuf_ofs))
+ goto exit;
+
+ if (ofs >= c->wbuf_ofs) {
+ owbf = (ofs - c->wbuf_ofs); /* offset in write buffer */
+ 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)
+ lwbf = len;
+ } 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)
+ lwbf = c->wbuf_len;
+ }
+ if (lwbf > 0)
+ memcpy(buf+orbf,c->wbuf+owbf,lwbf);
+
+exit:
+ up_read(&c->wbuf_sem);
+ return ret;
+}
+
+#define NR_OOB_SCAN_PAGES 4
+
+/* For historical reasons we use only 8 bytes for OOB clean marker */
+#define OOB_CM_SIZE 8
+
+static const struct jffs2_unknown_node oob_cleanmarker =
+{
+ .magic = constant_cpu_to_je16(JFFS2_MAGIC_BITMASK),
+ .nodetype = constant_cpu_to_je16(JFFS2_NODETYPE_CLEANMARKER),
+ .totlen = constant_cpu_to_je32(8)
+};
+
+/*
+ * Check, if the out of band area is empty. This function knows about the clean
+ * marker and if it is present in OOB, treats the OOB as empty anyway.
+ */
+int jffs2_check_oob_empty(struct jffs2_sb_info *c,
+ struct jffs2_eraseblock *jeb, int mode)
+{
+ int i, ret;
+ int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
+ struct mtd_oob_ops ops = { };
+
+ ops.mode = MTD_OPS_AUTO_OOB;
+ ops.ooblen = NR_OOB_SCAN_PAGES * c->oobavail;
+ ops.oobbuf = c->oobbuf;
+ ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
+ ops.datbuf = NULL;
+
+ ret = mtd_read_oob(c->mtd, jeb->offset, &ops);
+ if ((ret && !mtd_is_bitflip(ret)) || ops.oobretlen != ops.ooblen) {
+ pr_err("cannot read OOB for EB at %08x, requested %zd bytes, read %zd bytes, error %d\n",
+ jeb->offset, ops.ooblen, ops.oobretlen, ret);
+ if (!ret || mtd_is_bitflip(ret))
+ ret = -EIO;
+ return ret;
+ }
+
+ for(i = 0; i < ops.ooblen; i++) {
+ if (mode && i < cmlen)
+ /* Yeah, we know about the cleanmarker */
+ continue;
+
+ if (ops.oobbuf[i] != 0xFF) {
+ jffs2_dbg(2, "Found %02x at %x in OOB for "
+ "%08x\n", ops.oobbuf[i], i, jeb->offset);
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+/*
+ * Check for a valid cleanmarker.
+ * Returns: 0 if a valid cleanmarker was found
+ * 1 if no cleanmarker was found
+ * negative error code if an error occurred
+ */
+int jffs2_check_nand_cleanmarker(struct jffs2_sb_info *c,
+ struct jffs2_eraseblock *jeb)
+{
+ struct mtd_oob_ops ops = { };
+ int ret, cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
+
+ ops.mode = MTD_OPS_AUTO_OOB;
+ ops.ooblen = cmlen;
+ ops.oobbuf = c->oobbuf;
+ ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
+ ops.datbuf = NULL;
+
+ ret = mtd_read_oob(c->mtd, jeb->offset, &ops);
+ if ((ret && !mtd_is_bitflip(ret)) || ops.oobretlen != ops.ooblen) {
+ pr_err("cannot read OOB for EB at %08x, requested %zd bytes, read %zd bytes, error %d\n",
+ jeb->offset, ops.ooblen, ops.oobretlen, ret);
+ if (!ret || mtd_is_bitflip(ret))
+ ret = -EIO;
+ return ret;
+ }
+
+ return !!memcmp(&oob_cleanmarker, c->oobbuf, cmlen);
+}
+
+int jffs2_write_nand_cleanmarker(struct jffs2_sb_info *c,
+ struct jffs2_eraseblock *jeb)
+{
+ int ret;
+ struct mtd_oob_ops ops = { };
+ int cmlen = min_t(int, c->oobavail, OOB_CM_SIZE);
+
+ ops.mode = MTD_OPS_AUTO_OOB;
+ ops.ooblen = cmlen;
+ ops.oobbuf = (uint8_t *)&oob_cleanmarker;
+ ops.len = ops.ooboffs = ops.retlen = ops.oobretlen = 0;
+ ops.datbuf = NULL;
+
+ ret = mtd_write_oob(c->mtd, jeb->offset, &ops);
+ if (ret || ops.oobretlen != ops.ooblen) {
+ pr_err("cannot write OOB for EB at %08x, requested %zd bytes, read %zd bytes, error %d\n",
+ jeb->offset, ops.ooblen, ops.oobretlen, ret);
+ if (!ret)
+ ret = -EIO;
+ return ret;
+ }
+
+ return 0;
+}
+
+/*
+ * On NAND we try to mark this block bad. If the block was erased more
+ * than MAX_ERASE_FAILURES we mark it finally bad.
+ * Don't care about failures. This block remains on the erase-pending
+ * or badblock list as long as nobody manipulates the flash with
+ * a bootloader or something like that.
+ */
+
+int jffs2_write_nand_badblock(struct jffs2_sb_info *c, struct jffs2_eraseblock *jeb, uint32_t bad_offset)
+{
+ int ret;
+
+ /* if the count is < max, we try to write the counter to the 2nd page oob area */
+ if( ++jeb->bad_count < MAX_ERASE_FAILURES)
+ return 0;
+
+ pr_warn("marking eraseblock at %08x as bad\n", bad_offset);
+ ret = mtd_block_markbad(c->mtd, bad_offset);
+
+ if (ret) {
+ jffs2_dbg(1, "%s(): Write failed for block at %08x: error %d\n",
+ __func__, jeb->offset, ret);
+ return ret;
+ }
+ return 1;
+}
+
+static struct jffs2_sb_info *work_to_sb(struct work_struct *work)
+{
+ struct delayed_work *dwork;
+
+ dwork = to_delayed_work(work);
+ return container_of(dwork, struct jffs2_sb_info, wbuf_dwork);
+}
+
+static void delayed_wbuf_sync(struct work_struct *work)
+{
+ struct jffs2_sb_info *c = work_to_sb(work);
+ struct super_block *sb = OFNI_BS_2SFFJ(c);
+
+ if (!sb_rdonly(sb)) {
+ jffs2_dbg(1, "%s()\n", __func__);
+ jffs2_flush_wbuf_gc(c, 0);
+ }
+}
+
+void jffs2_dirty_trigger(struct jffs2_sb_info *c)
+{
+ struct super_block *sb = OFNI_BS_2SFFJ(c);
+ unsigned long delay;
+
+ if (sb_rdonly(sb))
+ return;
+
+ delay = msecs_to_jiffies(dirty_writeback_interval * 10);
+ if (queue_delayed_work(system_long_wq, &c->wbuf_dwork, delay))
+ jffs2_dbg(1, "%s()\n", __func__);
+}
+
+int jffs2_nand_flash_setup(struct jffs2_sb_info *c)
+{
+ if (!c->mtd->oobsize)
+ return 0;
+
+ /* Cleanmarker is out-of-band, so inline size zero */
+ c->cleanmarker_size = 0;
+
+ if (c->mtd->oobavail == 0) {
+ pr_err("inconsistent device description\n");
+ return -EINVAL;
+ }
+
+ jffs2_dbg(1, "using OOB on NAND\n");
+
+ c->oobavail = c->mtd->oobavail;
+
+ /* Initialise write buffer */
+ init_rwsem(&c->wbuf_sem);
+ INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
+ c->wbuf_pagesize = c->mtd->writesize;
+ c->wbuf_ofs = 0xFFFFFFFF;
+
+ c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+ if (!c->wbuf)
+ return -ENOMEM;
+
+ c->oobbuf = kmalloc_array(NR_OOB_SCAN_PAGES, c->oobavail, GFP_KERNEL);
+ if (!c->oobbuf) {
+ kfree(c->wbuf);
+ return -ENOMEM;
+ }
+
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+ if (!c->wbuf_verify) {
+ kfree(c->oobbuf);
+ kfree(c->wbuf);
+ return -ENOMEM;
+ }
+#endif
+ return 0;
+}
+
+void jffs2_nand_flash_cleanup(struct jffs2_sb_info *c)
+{
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ kfree(c->wbuf_verify);
+#endif
+ kfree(c->wbuf);
+ kfree(c->oobbuf);
+}
+
+int jffs2_dataflash_setup(struct jffs2_sb_info *c) {
+ c->cleanmarker_size = 0; /* No cleanmarkers needed */
+
+ /* Initialize write buffer */
+ init_rwsem(&c->wbuf_sem);
+ INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
+ 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;
+ pr_warn("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;
+
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+ if (!c->wbuf_verify) {
+ kfree(c->wbuf);
+ return -ENOMEM;
+ }
+#endif
+
+ pr_info("write-buffering enabled buffer (%d) erasesize (%d)\n",
+ c->wbuf_pagesize, c->sector_size);
+
+ return 0;
+}
+
+void jffs2_dataflash_cleanup(struct jffs2_sb_info *c) {
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ kfree(c->wbuf_verify);
+#endif
+ kfree(c->wbuf);
+}
+
+int jffs2_nor_wbuf_flash_setup(struct jffs2_sb_info *c) {
+ /* Cleanmarker currently occupies whole programming regions,
+ * either one or 2 for 8Byte STMicro flashes. */
+ c->cleanmarker_size = max(16u, c->mtd->writesize);
+
+ /* Initialize write buffer */
+ init_rwsem(&c->wbuf_sem);
+ INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
+
+ c->wbuf_pagesize = c->mtd->writesize;
+ c->wbuf_ofs = 0xFFFFFFFF;
+
+ c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+ if (!c->wbuf)
+ return -ENOMEM;
+
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ c->wbuf_verify = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+ if (!c->wbuf_verify) {
+ kfree(c->wbuf);
+ return -ENOMEM;
+ }
+#endif
+ return 0;
+}
+
+void jffs2_nor_wbuf_flash_cleanup(struct jffs2_sb_info *c) {
+#ifdef CONFIG_JFFS2_FS_WBUF_VERIFY
+ kfree(c->wbuf_verify);
+#endif
+ kfree(c->wbuf);
+}
+
+int jffs2_ubivol_setup(struct jffs2_sb_info *c) {
+ c->cleanmarker_size = 0;
+
+ if (c->mtd->writesize == 1)
+ /* We do not need write-buffer */
+ return 0;
+
+ init_rwsem(&c->wbuf_sem);
+ INIT_DELAYED_WORK(&c->wbuf_dwork, delayed_wbuf_sync);
+
+ c->wbuf_pagesize = c->mtd->writesize;
+ c->wbuf_ofs = 0xFFFFFFFF;
+ c->wbuf = kmalloc(c->wbuf_pagesize, GFP_KERNEL);
+ if (!c->wbuf)
+ return -ENOMEM;
+
+ pr_info("write-buffering enabled buffer (%d) erasesize (%d)\n",
+ c->wbuf_pagesize, c->sector_size);
+
+ return 0;
+}
+
+void jffs2_ubivol_cleanup(struct jffs2_sb_info *c) {
+ kfree(c->wbuf);
+}
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