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bcachefs: Improve reflink repair code

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When a reflink pointer points to an indirect extent that doesn't exist,
we need to replace it with a KEY_TYPE_error key.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2021-10-19 12:27:47 -04:00 • committed by Kent Overstreet
parent 488f97764a
commit dfc276df91
2 changed files with 43 additions and 10 deletions
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2
fs/bcachefs/btree_gc.c
View file

@ -738,7 +738,7 @@ static int bch2_gc_mark_key(struct bch_fs *c, enum btree_id btree_id,
*max_stale = max(*max_stale, ptr_stale(ca, ptr)); *max_stale = max(*max_stale, ptr_stale(ca, ptr));
} }
bch2_mark_key(c, *k, flags); ret = bch2_mark_key(c, *k, flags);
fsck_err: fsck_err:
err: err:
if (ret) if (ret)

51
fs/bcachefs/buckets.c
View file

@ -14,6 +14,7 @@
#include "ec.h" #include "ec.h"
#include "error.h" #include "error.h"
#include "movinggc.h" #include "movinggc.h"
#include "recovery.h"
#include "reflink.h" #include "reflink.h"
#include "replicas.h" #include "replicas.h"
#include "subvolume.h" #include "subvolume.h"
@ -1115,10 +1116,9 @@ static s64 __bch2_mark_reflink_p(struct bch_fs *c, struct bkey_s_c_reflink_p p,
{ {
struct reflink_gc *r; struct reflink_gc *r;
int add = !(flags & BTREE_TRIGGER_OVERWRITE) ? 1 : -1; int add = !(flags & BTREE_TRIGGER_OVERWRITE) ? 1 : -1;
s64 ret = 0;
while (1) { while (*r_idx < c->reflink_gc_nr) {
if (*r_idx >= c->reflink_gc_nr)
goto not_found;
r = genradix_ptr(&c->reflink_gc_table, *r_idx); r = genradix_ptr(&c->reflink_gc_table, *r_idx);
BUG_ON(!r); BUG_ON(!r);
@ -1127,16 +1127,49 @@ static s64 __bch2_mark_reflink_p(struct bch_fs *c, struct bkey_s_c_reflink_p p,
(*r_idx)++; (*r_idx)++;
} }
if (*r_idx >= c->reflink_gc_nr ||
idx < r->offset - r->size) {
ret = p.k->size;
goto not_found;
}
BUG_ON((s64) r->refcount + add < 0); BUG_ON((s64) r->refcount + add < 0);
r->refcount += add; r->refcount += add;
return r->offset - idx; return r->offset - idx;
not_found: not_found:
bch2_fs_inconsistent(c, if ((flags & BTREE_TRIGGER_GC) &&
"%llu:%llu len %u points to nonexistent indirect extent %llu", (flags & BTREE_TRIGGER_NOATOMIC)) {
p.k->p.inode, p.k->p.offset, p.k->size, idx); /*
bch2_inconsistent_error(c); * XXX: we're replacing the entire reflink pointer with an error
return -EIO; * key, we should just be replacing the part that was missing:
*/
if (fsck_err(c, "%llu:%llu len %u points to nonexistent indirect extent %llu",
p.k->p.inode, p.k->p.offset, p.k->size, idx)) {
struct bkey_i_error *new;
new = kmalloc(sizeof(*new), GFP_KERNEL);
if (!new) {
bch_err(c, "%s: error allocating new key", __func__);
return -ENOMEM;
}
bkey_init(&new->k);
new->k.type = KEY_TYPE_error;
new->k.p = p.k->p;
new->k.size = p.k->size;
ret = bch2_journal_key_insert(c, BTREE_ID_extents, 0, &new->k_i);
}
} else {
bch2_fs_inconsistent(c,
"%llu:%llu len %u points to nonexistent indirect extent %llu",
p.k->p.inode, p.k->p.offset, p.k->size, idx);
bch2_inconsistent_error(c);
ret = -EIO;
}
fsck_err:
return ret;
} }
static int bch2_mark_reflink_p(struct bch_fs *c, static int bch2_mark_reflink_p(struct bch_fs *c,
@ -1168,7 +1201,7 @@ static int bch2_mark_reflink_p(struct bch_fs *c,
while (sectors) { while (sectors) {
ret = __bch2_mark_reflink_p(c, p, idx, flags, &l); ret = __bch2_mark_reflink_p(c, p, idx, flags, &l);
if (ret < 0) if (ret <= 0)
return ret; return ret;
ret = min_t(s64, ret, sectors); ret = min_t(s64, ret, sectors);