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[JFFS2] Correct handling of JFFS2_FEATURE_RWCOMPAT_COPY nodes.

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We should preserve these when we come to garbage collect them, not let
them get erased. Use jffs2_garbage_collect_pristine() for this, and make
sure the summary code copes -- just refrain from writing a summary for any
block which contains a node we don't understand.

Signed-off-by: David Woodhouse <dwmw2@infradead.org>
This commit is contained in:
David Woodhouse 2006-05-21 00:02:06 +01:00
parent fb9fbbcc93
commit 6171586a7a
4 changed files with 55 additions and 23 deletions
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49
fs/jffs2/gc.c
View File

@ -256,10 +256,14 @@ int jffs2_garbage_collect_pass(struct jffs2_sb_info *c)
if (!raw->next_in_ino) {
/* Inode-less node. Clean marker, snapshot or something like that */
/* FIXME: If it's something that needs to be copied, including something
we don't grok that has JFFS2_NODETYPE_RWCOMPAT_COPY, we should do so */
spin_unlock(&c->erase_completion_lock);
jffs2_mark_node_obsolete(c, raw);
if (ref_flags(raw) == REF_PRISTINE) {
/* It's an unknown node with JFFS2_FEATURE_RWCOMPAT_COPY */
jffs2_garbage_collect_pristine(c, NULL, raw);
} else {
/* Just mark it obsolete */
jffs2_mark_node_obsolete(c, raw);
}
up(&c->alloc_sem);
goto eraseit_lock;
}
@ -533,15 +537,16 @@ static int jffs2_garbage_collect_pristine(struct jffs2_sb_info *c,
D1(printk(KERN_DEBUG "Going to GC REF_PRISTINE node at 0x%08x\n", ref_offset(raw)));
rawlen = ref_totlen(c, c->gcblock, raw);
alloclen = rawlen = ref_totlen(c, c->gcblock, raw);
/* Ask for a small amount of space (or the totlen if smaller) because we
don't want to force wastage of the end of a block if splitting would
work. */
ret = jffs2_reserve_space_gc(c, min_t(uint32_t, sizeof(struct jffs2_raw_inode) +
JFFS2_MIN_DATA_LEN, rawlen), &phys_ofs, &alloclen, rawlen);
/* this is not the exact summary size of it,
it is only an upper estimation */
if (ic && alloclen > sizeof(struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN)
alloclen = sizeof(struct jffs2_raw_inode) + JFFS2_MIN_DATA_LEN;
ret = jffs2_reserve_space_gc(c, alloclen, &phys_ofs, &alloclen, rawlen);
/* 'rawlen' is not the exact summary size; it is only an upper estimation */
if (ret)
return ret;
@ -605,9 +610,12 @@ static int jffs2_garbage_collect_pristine(struct jffs2_sb_info *c,
}
break;
default:
printk(KERN_WARNING "Unknown node type for REF_PRISTINE node at 0x%08x: 0x%04x\n",
ref_offset(raw), je16_to_cpu(node->u.nodetype));
goto bail;
/* If it's inode-less, we don't _know_ what it is. Just copy it intact */
if (ic) {
printk(KERN_WARNING "Unknown node type for REF_PRISTINE node at 0x%08x: 0x%04x\n",
ref_offset(raw), je16_to_cpu(node->u.nodetype));
goto bail;
}
}
nraw = jffs2_alloc_raw_node_ref();
@ -674,15 +682,16 @@ static int jffs2_garbage_collect_pristine(struct jffs2_sb_info *c,
nraw->flash_offset |= REF_PRISTINE;
jffs2_add_physical_node_ref(c, nraw);
/* Link into per-inode list. This is safe because of the ic
state being INO_STATE_GC. Note that if we're doing this
for an inode which is in-core, the 'nraw' pointer is then
going to be fetched from ic->nodes by our caller. */
spin_lock(&c->erase_completion_lock);
nraw->next_in_ino = ic->nodes;
ic->nodes = nraw;
spin_unlock(&c->erase_completion_lock);
if (ic) {
/* Link into per-inode list. This is safe because of the ic
state being INO_STATE_GC. Note that if we're doing this
for an inode which is in-core, the 'nraw' pointer is then
going to be fetched from ic->nodes by our caller. */
spin_lock(&c->erase_completion_lock);
nraw->next_in_ino = ic->nodes;
ic->nodes = nraw;
spin_unlock(&c->erase_completion_lock);
}
jffs2_mark_node_obsolete(c, raw);
D1(printk(KERN_DEBUG "WHEEE! GC REF_PRISTINE node at 0x%08x succeeded\n", ref_offset(raw)));

5
fs/jffs2/nodelist.h
View File

@ -97,6 +97,11 @@ struct jffs2_raw_node_ref
#define ref_obsolete(ref) (((ref)->flash_offset & 3) == REF_OBSOLETE)
#define mark_ref_normal(ref) do { (ref)->flash_offset = ref_offset(ref) | REF_NORMAL; } while(0)
/* NB: REF_PRISTINE for an inode-less node (ref->next_in_ino == NULL) indicates
it is an unknown node of type JFFS2_NODETYPE_RWCOMPAT_COPY, so it'll get
copied. If you need to do anything different to GC inode-less nodes, then
you need to modify gc.c accordingly. */
/* For each inode in the filesystem, we need to keep a record of
nlink, because it would be a PITA to scan the whole directory tree
at read_inode() time to calculate it, and to keep sufficient information

15
fs/jffs2/scan.c
View File

@ -851,11 +851,22 @@ scan_more:
ofs += PAD(je32_to_cpu(node->totlen));
break;
case JFFS2_FEATURE_RWCOMPAT_COPY:
case JFFS2_FEATURE_RWCOMPAT_COPY: {
struct jffs2_raw_node_ref *ref;
D1(printk(KERN_NOTICE "Unknown but compatible feature node (0x%04x) found at offset 0x%08x\n", je16_to_cpu(node->nodetype), ofs));
USED_SPACE(PAD(je32_to_cpu(node->totlen)));
ref = jffs2_alloc_raw_node_ref();
if (!ref)
return -ENOMEM;
ref->flash_offset = ofs | REF_PRISTINE;
ref->next_in_ino = 0;
jffs2_link_node_ref(c, jeb, ref, PAD(je32_to_cpu(node->totlen)));
/* We can't summarise nodes we don't grok */
jffs2_sum_disable_collecting(s);
ofs += PAD(je32_to_cpu(node->totlen));
break;
}
}
}
}

9
fs/jffs2/summary.c
View File

@ -760,7 +760,14 @@ static int jffs2_sum_write_data(struct jffs2_sb_info *c, struct jffs2_eraseblock
}
#endif
default : {
BUG(); /* unknown node in summary information */
if ((je16_to_cpu(temp->u.nodetype) & JFFS2_COMPAT_MASK)
== JFFS2_FEATURE_RWCOMPAT_COPY) {
dbg_summary("Writing unknown RWCOMPAT_COPY node type %x\n",
je16_to_cpu(temp->u.nodetype));
jffs2_sum_disable_collecting(c->summary);
} else {
BUG(); /* unknown node in summary information */
}
}
}