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bcachefs fixes for 6.12-rc4

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- New metadata version inode_has_child_snapshots
   This fixes bugs with handling of unlinked inodes + snapshots, in
   particular when an inode is reattached after taking a snapshot;
   deleted inodes now get correctly cleaned up across snapshots.
 
 - Disk accounting rewrite fixes
   - validation fixes for when a device has been removed
   - fix journal replay failing with "journal_reclaim_would_deadlock"
 
 - Some more small fixes for erasure coding + device removal
 
 - Assorted small syzbot fixes
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Merge tag 'bcachefs-2024-10-14' of git://evilpiepirate.org/bcachefs

Pull bcachefs fixes from Kent Overstreet:

 - New metadata version inode_has_child_snapshots

   This fixes bugs with handling of unlinked inodes + snapshots, in
   particular when an inode is reattached after taking a snapshot;
   deleted inodes now get correctly cleaned up across snapshots.

 - Disk accounting rewrite fixes
     - validation fixes for when a device has been removed
     - fix journal replay failing with "journal_reclaim_would_deadlock"

 - Some more small fixes for erasure coding + device removal

 - Assorted small syzbot fixes

* tag 'bcachefs-2024-10-14' of git://evilpiepirate.org/bcachefs: (27 commits)
  bcachefs: Fix sysfs warning in fstests generic/730,731
  bcachefs: Handle race between stripe reuse, invalidate_stripe_to_dev
  bcachefs: Fix kasan splat in new_stripe_alloc_buckets()
  bcachefs: Add missing validation for bch_stripe.csum_granularity_bits
  bcachefs: Fix missing bounds checks in bch2_alloc_read()
  bcachefs: fix uaf in bch2_dio_write_done()
  bcachefs: Improve check_snapshot_exists()
  bcachefs: Fix bkey_nocow_lock()
  bcachefs: Fix accounting replay flags
  bcachefs: Fix invalid shift in member_to_text()
  bcachefs: Fix bch2_have_enough_devs() for BCH_SB_MEMBER_INVALID
  bcachefs: __wait_for_freeing_inode: Switch to wait_bit_queue_entry
  bcachefs: Check if stuck in journal_res_get()
  closures: Add closure_wait_event_timeout()
  bcachefs: Fix state lock involved deadlock
  bcachefs: Fix NULL pointer dereference in bch2_opt_to_text
  bcachefs: Release transaction before wake up
  bcachefs: add check for btree id against max in try read node
  bcachefs: Disk accounting device validation fixes
  bcachefs: bch2_inode_or_descendents_is_open()
  ...
This commit is contained in:
Linus Torvalds 2024-10-15 11:06:45 -07:00
commit bdc7276512
32 changed files with 977 additions and 401 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
fs/bcachefs/alloc_background.c
View File

@ -639,6 +639,16 @@ int bch2_alloc_read(struct bch_fs *c)
continue;
}
if (k.k->p.offset < ca->mi.first_bucket) {
bch2_btree_iter_set_pos(&iter, POS(k.k->p.inode, ca->mi.first_bucket));
continue;
}
if (k.k->p.offset >= ca->mi.nbuckets) {
bch2_btree_iter_set_pos(&iter, POS(k.k->p.inode + 1, 0));
continue;
}
struct bch_alloc_v4 a;
*bucket_gen(ca, k.k->p.offset) = bch2_alloc_to_v4(k, &a)->gen;
0;

3
fs/bcachefs/bcachefs_format.h
View File

@ -678,7 +678,8 @@ struct bch_sb_field_ext {
x(disk_accounting_v2, BCH_VERSION(1, 9)) \
x(disk_accounting_v3, BCH_VERSION(1, 10)) \
x(disk_accounting_inum, BCH_VERSION(1, 11)) \
x(rebalance_work_acct_fix, BCH_VERSION(1, 12))
x(rebalance_work_acct_fix, BCH_VERSION(1, 12)) \
x(inode_has_child_snapshots, BCH_VERSION(1, 13))
enum bcachefs_metadata_version {
bcachefs_metadata_version_min = 9,

15
fs/bcachefs/btree_gc.c
View File

@ -1224,17 +1224,20 @@ int bch2_gc_gens(struct bch_fs *c)
u64 b, start_time = local_clock();
int ret;
/*
* Ideally we would be using state_lock and not gc_gens_lock here, but that
* introduces a deadlock in the RO path - we currently take the state
* lock at the start of going RO, thus the gc thread may get stuck:
*/
if (!mutex_trylock(&c->gc_gens_lock))
return 0;
trace_and_count(c, gc_gens_start, c);
down_read(&c->state_lock);
/*
* We have to use trylock here. Otherwise, we would
* introduce a deadlock in the RO path - we take the
* state lock at the start of going RO.
*/
if (!down_read_trylock(&c->state_lock)) {
mutex_unlock(&c->gc_gens_lock);
return 0;
}
for_each_member_device(c, ca) {
struct bucket_gens *gens = bucket_gens(ca);

5
fs/bcachefs/btree_io.c
View File

@ -1838,10 +1838,11 @@ static void btree_node_write_done(struct bch_fs *c, struct btree *b)
struct btree_trans *trans = bch2_trans_get(c);
btree_node_lock_nopath_nofail(trans, &b->c, SIX_LOCK_read);
/* we don't need transaction context anymore after we got the lock. */
bch2_trans_put(trans);
__btree_node_write_done(c, b);
six_unlock_read(&b->c.lock);
bch2_trans_put(trans);
}
static void btree_node_write_work(struct work_struct *work)

6
fs/bcachefs/btree_iter.c
View File

@ -2381,9 +2381,9 @@ struct bkey_s_c bch2_btree_iter_peek_upto(struct btree_iter *iter, struct bpos e
else
iter_pos = bkey_max(iter->pos, bkey_start_pos(k.k));
if (unlikely(!(iter->flags & BTREE_ITER_is_extents)
? bkey_gt(iter_pos, end)
: bkey_ge(iter_pos, end)))
if (unlikely(iter->flags & BTREE_ITER_all_snapshots ? bpos_gt(iter_pos, end) :
iter->flags & BTREE_ITER_is_extents ? bkey_ge(iter_pos, end) :
bkey_gt(iter_pos, end)))
goto end;
break;

8
fs/bcachefs/btree_iter.h
View File

@ -857,6 +857,14 @@ struct bkey_s_c bch2_btree_iter_peek_and_restart_outlined(struct btree_iter *);
for_each_btree_key_upto_norestart(_trans, _iter, _btree_id, _start,\
SPOS_MAX, _flags, _k, _ret)
#define for_each_btree_key_reverse_norestart(_trans, _iter, _btree_id, \
_start, _flags, _k, _ret) \
for (bch2_trans_iter_init((_trans), &(_iter), (_btree_id), \
(_start), (_flags)); \
(_k) = bch2_btree_iter_peek_prev_type(&(_iter), _flags), \
!((_ret) = bkey_err(_k)) && (_k).k; \
bch2_btree_iter_rewind(&(_iter)))
#define for_each_btree_key_continue_norestart(_iter, _flags, _k, _ret) \
for_each_btree_key_upto_continue_norestart(_iter, SPOS_MAX, _flags, _k, _ret)

3
fs/bcachefs/btree_node_scan.c
View File

@ -171,6 +171,9 @@ static void try_read_btree_node(struct find_btree_nodes *f, struct bch_dev *ca,
if (BTREE_NODE_LEVEL(bn) >= BTREE_MAX_DEPTH)
return;
if (BTREE_NODE_ID(bn) >= BTREE_ID_NR_MAX)
return;
rcu_read_lock();
struct found_btree_node n = {
.btree_id = BTREE_NODE_ID(bn),

1
fs/bcachefs/data_update.c
View File

@ -80,6 +80,7 @@ static bool bkey_nocow_lock(struct bch_fs *c, struct moving_context *ctxt, struc
if (ptr2 == ptr)
break;
ca = bch2_dev_have_ref(c, ptr2->dev);
bucket = PTR_BUCKET_POS(ca, ptr2);
bch2_bucket_nocow_unlock(&c->nocow_locks, bucket, 0);
}

151
fs/bcachefs/disk_accounting.c
View File

@ -242,6 +242,14 @@ void bch2_accounting_swab(struct bkey_s k)
*p = swab64(*p);
}
static inline void __accounting_to_replicas(struct bch_replicas_entry_v1 *r,
struct disk_accounting_pos acc)
{
unsafe_memcpy(r, &acc.replicas,
replicas_entry_bytes(&acc.replicas),
"variable length struct");
}
static inline bool accounting_to_replicas(struct bch_replicas_entry_v1 *r, struct bpos p)
{
struct disk_accounting_pos acc_k;
@ -249,9 +257,7 @@ static inline bool accounting_to_replicas(struct bch_replicas_entry_v1 *r, struc
switch (acc_k.type) {
case BCH_DISK_ACCOUNTING_replicas:
unsafe_memcpy(r, &acc_k.replicas,
replicas_entry_bytes(&acc_k.replicas),
"variable length struct");
__accounting_to_replicas(r, acc_k);
return true;
default:
return false;
@ -608,6 +614,81 @@ static int accounting_read_key(struct btree_trans *trans, struct bkey_s_c k)
return ret;
}
static int bch2_disk_accounting_validate_late(struct btree_trans *trans,
struct disk_accounting_pos acc,
u64 *v, unsigned nr)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
int ret = 0, invalid_dev = -1;
switch (acc.type) {
case BCH_DISK_ACCOUNTING_replicas: {
struct bch_replicas_padded r;
__accounting_to_replicas(&r.e, acc);
for (unsigned i = 0; i < r.e.nr_devs; i++)
if (r.e.devs[i] != BCH_SB_MEMBER_INVALID &&
!bch2_dev_exists(c, r.e.devs[i])) {
invalid_dev = r.e.devs[i];
goto invalid_device;
}
/*
* All replicas entry checks except for invalid device are done
* in bch2_accounting_validate
*/
BUG_ON(bch2_replicas_entry_validate(&r.e, c, &buf));
if (fsck_err_on(!bch2_replicas_marked_locked(c, &r.e),
trans, accounting_replicas_not_marked,
"accounting not marked in superblock replicas\n %s",
(printbuf_reset(&buf),
bch2_accounting_key_to_text(&buf, &acc),
buf.buf))) {
/*
* We're not RW yet and still single threaded, dropping
* and retaking lock is ok:
*/
percpu_up_write(&c->mark_lock);
ret = bch2_mark_replicas(c, &r.e);
if (ret)
goto fsck_err;
percpu_down_write(&c->mark_lock);
}
break;
}
case BCH_DISK_ACCOUNTING_dev_data_type:
if (!bch2_dev_exists(c, acc.dev_data_type.dev)) {
invalid_dev = acc.dev_data_type.dev;
goto invalid_device;
}
break;
}
fsck_err:
printbuf_exit(&buf);
return ret;
invalid_device:
if (fsck_err(trans, accounting_to_invalid_device,
"accounting entry points to invalid device %i\n %s",
invalid_dev,
(printbuf_reset(&buf),
bch2_accounting_key_to_text(&buf, &acc),
buf.buf))) {
for (unsigned i = 0; i < nr; i++)
v[i] = -v[i];
ret = commit_do(trans, NULL, NULL, 0,
bch2_disk_accounting_mod(trans, &acc, v, nr, false)) ?:
-BCH_ERR_remove_disk_accounting_entry;
} else {
ret = -BCH_ERR_remove_disk_accounting_entry;
}
goto fsck_err;
}
/*
* At startup time, initialize the in memory accounting from the btree (and
* journal)
@ -666,44 +747,42 @@ int bch2_accounting_read(struct bch_fs *c)
}
keys->gap = keys->nr = dst - keys->data;
percpu_down_read(&c->mark_lock);
for (unsigned i = 0; i < acc->k.nr; i++) {
percpu_down_write(&c->mark_lock);
unsigned i = 0;
while (i < acc->k.nr) {
unsigned idx = inorder_to_eytzinger0(i, acc->k.nr);
struct disk_accounting_pos acc_k;
bpos_to_disk_accounting_pos(&acc_k, acc->k.data[idx].pos);
u64 v[BCH_ACCOUNTING_MAX_COUNTERS];
bch2_accounting_mem_read_counters(acc, i, v, ARRAY_SIZE(v), false);
if (bch2_is_zero(v, sizeof(v[0]) * acc->k.data[i].nr_counters))
continue;
struct bch_replicas_padded r;
if (!accounting_to_replicas(&r.e, acc->k.data[i].pos))
continue;
bch2_accounting_mem_read_counters(acc, idx, v, ARRAY_SIZE(v), false);
/*
* If the replicas entry is invalid it'll get cleaned up by
* check_allocations:
* If the entry counters are zeroed, it should be treated as
* nonexistent - it might point to an invalid device.
*
* Remove it, so that if it's re-added it gets re-marked in the
* superblock:
*/
if (bch2_replicas_entry_validate(&r.e, c, &buf))
ret = bch2_is_zero(v, sizeof(v[0]) * acc->k.data[idx].nr_counters)
? -BCH_ERR_remove_disk_accounting_entry
: bch2_disk_accounting_validate_late(trans, acc_k,
v, acc->k.data[idx].nr_counters);
if (ret == -BCH_ERR_remove_disk_accounting_entry) {
free_percpu(acc->k.data[idx].v[0]);
free_percpu(acc->k.data[idx].v[1]);
darray_remove_item(&acc->k, &acc->k.data[idx]);
eytzinger0_sort(acc->k.data, acc->k.nr, sizeof(acc->k.data[0]),
accounting_pos_cmp, NULL);
ret = 0;
continue;
struct disk_accounting_pos k;
bpos_to_disk_accounting_pos(&k, acc->k.data[i].pos);
if (fsck_err_on(!bch2_replicas_marked_locked(c, &r.e),
trans, accounting_replicas_not_marked,
"accounting not marked in superblock replicas\n %s",
(printbuf_reset(&buf),
bch2_accounting_key_to_text(&buf, &k),
buf.buf))) {
/*
* We're not RW yet and still single threaded, dropping
* and retaking lock is ok:
*/
percpu_up_read(&c->mark_lock);
ret = bch2_mark_replicas(c, &r.e);
if (ret)
goto fsck_err;
percpu_down_read(&c->mark_lock);
}
if (ret)
goto fsck_err;
i++;
}
preempt_disable();
@ -742,7 +821,7 @@ int bch2_accounting_read(struct bch_fs *c)
}
preempt_enable();
fsck_err:
percpu_up_read(&c->mark_lock);
percpu_up_write(&c->mark_lock);
err:
printbuf_exit(&buf);
bch2_trans_put(trans);

94
fs/bcachefs/ec.c
View File

@ -124,6 +124,11 @@ int bch2_stripe_validate(struct bch_fs *c, struct bkey_s_c k,
"incorrect value size (%zu < %u)",
bkey_val_u64s(k.k), stripe_val_u64s(s));
bkey_fsck_err_on(s->csum_granularity_bits >= 64,
c, stripe_csum_granularity_bad,
"invalid csum granularity (%u >= 64)",
s->csum_granularity_bits);
ret = bch2_bkey_ptrs_validate(c, k, flags);
fsck_err:
return ret;
@ -145,7 +150,11 @@ void bch2_stripe_to_text(struct printbuf *out, struct bch_fs *c,
nr_data,
s.nr_redundant);
bch2_prt_csum_type(out, s.csum_type);
prt_printf(out, " gran %u", 1U << s.csum_granularity_bits);
prt_str(out, " gran ");
if (s.csum_granularity_bits < 64)
prt_printf(out, "%llu", 1ULL << s.csum_granularity_bits);
else
prt_printf(out, "(invalid shift %u)", s.csum_granularity_bits);
if (s.disk_label) {
prt_str(out, " label");
@ -1197,47 +1206,62 @@ void bch2_do_stripe_deletes(struct bch_fs *c)
/* stripe creation: */
static int ec_stripe_key_update(struct btree_trans *trans,
struct bkey_i_stripe *new,
bool create)
struct bkey_i_stripe *old,
struct bkey_i_stripe *new)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bkey_s_c k;
int ret;
bool create = !old;
k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_stripes,
new->k.p, BTREE_ITER_intent);
ret = bkey_err(k);
struct btree_iter iter;
struct bkey_s_c k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_stripes,
new->k.p, BTREE_ITER_intent);
int ret = bkey_err(k);
if (ret)
goto err;
if (k.k->type != (create ? KEY_TYPE_deleted : KEY_TYPE_stripe)) {
bch2_fs_inconsistent(c, "error %s stripe: got existing key type %s",
create ? "creating" : "updating",
bch2_bkey_types[k.k->type]);
if (bch2_fs_inconsistent_on(k.k->type != (create ? KEY_TYPE_deleted : KEY_TYPE_stripe),
c, "error %s stripe: got existing key type %s",
create ? "creating" : "updating",
bch2_bkey_types[k.k->type])) {
ret = -EINVAL;
goto err;
}
if (k.k->type == KEY_TYPE_stripe) {
const struct bch_stripe *old = bkey_s_c_to_stripe(k).v;
unsigned i;
const struct bch_stripe *v = bkey_s_c_to_stripe(k).v;
if (old->nr_blocks != new->v.nr_blocks) {
bch_err(c, "error updating stripe: nr_blocks does not match");
ret = -EINVAL;
goto err;
}
BUG_ON(old->v.nr_blocks != new->v.nr_blocks);
BUG_ON(old->v.nr_blocks != v->nr_blocks);
for (i = 0; i < new->v.nr_blocks; i++) {
unsigned v = stripe_blockcount_get(old, i);
for (unsigned i = 0; i < new->v.nr_blocks; i++) {
unsigned sectors = stripe_blockcount_get(v, i);
BUG_ON(v &&
(old->ptrs[i].dev != new->v.ptrs[i].dev ||
old->ptrs[i].gen != new->v.ptrs[i].gen ||
old->ptrs[i].offset != new->v.ptrs[i].offset));
if (!bch2_extent_ptr_eq(old->v.ptrs[i], new->v.ptrs[i]) && sectors) {
struct printbuf buf = PRINTBUF;
stripe_blockcount_set(&new->v, i, v);
prt_printf(&buf, "stripe changed nonempty block %u", i);
prt_str(&buf, "\nold: ");
bch2_bkey_val_to_text(&buf, c, k);
prt_str(&buf, "\nnew: ");
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(&new->k_i));
bch2_fs_inconsistent(c, "%s", buf.buf);
printbuf_exit(&buf);
ret = -EINVAL;
goto err;
}
/*
* If the stripe ptr changed underneath us, it must have
* been dev_remove_stripes() -> * invalidate_stripe_to_dev()
*/
if (!bch2_extent_ptr_eq(old->v.ptrs[i], v->ptrs[i])) {
BUG_ON(v->ptrs[i].dev != BCH_SB_MEMBER_INVALID);
if (bch2_extent_ptr_eq(old->v.ptrs[i], new->v.ptrs[i]))
new->v.ptrs[i].dev = BCH_SB_MEMBER_INVALID;
}
stripe_blockcount_set(&new->v, i, sectors);
}
}
@ -1499,8 +1523,10 @@ static void ec_stripe_create(struct ec_stripe_new *s)
BCH_TRANS_COMMIT_no_check_rw|
BCH_TRANS_COMMIT_no_enospc,
ec_stripe_key_update(trans,
bkey_i_to_stripe(&s->new_stripe.key),
!s->have_existing_stripe));
s->have_existing_stripe
? bkey_i_to_stripe(&s->existing_stripe.key)
: NULL,
bkey_i_to_stripe(&s->new_stripe.key)));
bch_err_msg(c, ret, "creating stripe key");
if (ret) {
goto err;
@ -1876,7 +1902,15 @@ static int new_stripe_alloc_buckets(struct btree_trans *trans, struct ec_stripe_
bitmap_and(devs.d, devs.d, c->rw_devs[BCH_DATA_user].d, BCH_SB_MEMBERS_MAX);
for_each_set_bit(i, h->s->blocks_gotten, v->nr_blocks) {
__clear_bit(v->ptrs[i].dev, devs.d);
/*
* Note: we don't yet repair invalid blocks (failed/removed
* devices) when reusing stripes - we still need a codepath to
* walk backpointers and update all extents that point to that
* block when updating the stripe
*/
if (v->ptrs[i].dev != BCH_SB_MEMBER_INVALID)
__clear_bit(v->ptrs[i].dev, devs.d);
if (i < h->s->nr_data)
nr_have_data++;
else

3
fs/bcachefs/errcode.h
View File

@ -268,7 +268,8 @@
x(BCH_ERR_nopromote, nopromote_no_writes) \
x(BCH_ERR_nopromote, nopromote_enomem) \
x(0, invalid_snapshot_node) \
x(0, option_needs_open_fs)
x(0, option_needs_open_fs) \
x(0, remove_disk_accounting_entry)
enum bch_errcode {
BCH_ERR_START = 2048,

10
fs/bcachefs/extents.h
View File

@ -695,6 +695,16 @@ void bch2_bkey_ptrs_to_text(struct printbuf *, struct bch_fs *,
int bch2_bkey_ptrs_validate(struct bch_fs *, struct bkey_s_c,
enum bch_validate_flags);
static inline bool bch2_extent_ptr_eq(struct bch_extent_ptr ptr1,
struct bch_extent_ptr ptr2)
{
return (ptr1.cached == ptr2.cached &&
ptr1.unwritten == ptr2.unwritten &&
ptr1.offset == ptr2.offset &&
ptr1.dev == ptr2.dev &&
ptr1.dev == ptr2.dev);
}
void bch2_ptr_swab(struct bkey_s);
const struct bch_extent_rebalance *bch2_bkey_rebalance_opts(struct bkey_s_c);

3
fs/bcachefs/fs-io-direct.c
View File

@ -369,6 +369,7 @@ static noinline void bch2_dio_write_flush(struct dio_write *dio)
static __always_inline long bch2_dio_write_done(struct dio_write *dio)
{
struct bch_fs *c = dio->op.c;
struct kiocb *req = dio->req;
struct bch_inode_info *inode = dio->inode;
bool sync = dio->sync;
@ -387,7 +388,7 @@ static __always_inline long bch2_dio_write_done(struct dio_write *dio)
ret = dio->op.error ?: ((long) dio->written << 9);
bio_put(&dio->op.wbio.bio);
bch2_write_ref_put(dio->op.c, BCH_WRITE_REF_dio_write);
bch2_write_ref_put(c, BCH_WRITE_REF_dio_write);
/* inode->i_dio_count is our ref on inode and thus bch_fs */
inode_dio_end(&inode->v);

102
fs/bcachefs/fs.c
View File

@ -157,6 +157,20 @@ static bool subvol_inum_eq(subvol_inum a, subvol_inum b)
return a.subvol == b.subvol && a.inum == b.inum;
}
static u32 bch2_vfs_inode_hash_fn(const void *data, u32 len, u32 seed)
{
const subvol_inum *inum = data;
return jhash(&inum->inum, sizeof(inum->inum), seed);
}
static u32 bch2_vfs_inode_obj_hash_fn(const void *data, u32 len, u32 seed)
{
const struct bch_inode_info *inode = data;
return bch2_vfs_inode_hash_fn(&inode->ei_inum, sizeof(inode->ei_inum), seed);
}
static int bch2_vfs_inode_cmp_fn(struct rhashtable_compare_arg *arg,
const void *obj)
{
@ -170,11 +184,91 @@ static const struct rhashtable_params bch2_vfs_inodes_params = {
.head_offset = offsetof(struct bch_inode_info, hash),
.key_offset = offsetof(struct bch_inode_info, ei_inum),
.key_len = sizeof(subvol_inum),
.hashfn = bch2_vfs_inode_hash_fn,
.obj_hashfn = bch2_vfs_inode_obj_hash_fn,
.obj_cmpfn = bch2_vfs_inode_cmp_fn,
.automatic_shrinking = true,
};
struct bch_inode_info *__bch2_inode_hash_find(struct bch_fs *c, subvol_inum inum)
int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p)
{
struct bch_fs *c = trans->c;
struct rhashtable *ht = &c->vfs_inodes_table;
subvol_inum inum = (subvol_inum) { .inum = p.offset };
DARRAY(u32) subvols;
int ret = 0;
if (!test_bit(BCH_FS_started, &c->flags))
return false;
darray_init(&subvols);
restart_from_top:
/*
* Tweaked version of __rhashtable_lookup(); we need to get a list of
* subvolumes in which the given inode number is open.
*
* For this to work, we don't include the subvolume ID in the key that
* we hash - all inodes with the same inode number regardless of
* subvolume will hash to the same slot.
*
* This will be less than ideal if the same file is ever open
* simultaneously in many different snapshots:
*/
rcu_read_lock();
struct rhash_lock_head __rcu *const *bkt;
struct rhash_head *he;
unsigned int hash;
struct bucket_table *tbl = rht_dereference_rcu(ht->tbl, ht);
restart:
hash = rht_key_hashfn(ht, tbl, &inum, bch2_vfs_inodes_params);
bkt = rht_bucket(tbl, hash);
do {
struct bch_inode_info *inode;
rht_for_each_entry_rcu_from(inode, he, rht_ptr_rcu(bkt), tbl, hash, hash) {
if (inode->ei_inum.inum == inum.inum) {
ret = darray_push_gfp(&subvols, inode->ei_inum.subvol,
GFP_NOWAIT|__GFP_NOWARN);
if (ret) {
rcu_read_unlock();
ret = darray_make_room(&subvols, 1);
if (ret)
goto err;
subvols.nr = 0;
goto restart_from_top;
}
}
}
/* An object might have been moved to a different hash chain,
* while we walk along it - better check and retry.
*/
} while (he != RHT_NULLS_MARKER(bkt));
/* Ensure we see any new tables. */
smp_rmb();
tbl = rht_dereference_rcu(tbl->future_tbl, ht);
if (unlikely(tbl))
goto restart;
rcu_read_unlock();
darray_for_each(subvols, i) {
u32 snap;
ret = bch2_subvolume_get_snapshot(trans, *i, &snap);
if (ret)
goto err;
ret = bch2_snapshot_is_ancestor(c, snap, p.snapshot);
if (ret)
break;
}
err:
darray_exit(&subvols);
return ret;
}
static struct bch_inode_info *__bch2_inode_hash_find(struct bch_fs *c, subvol_inum inum)
{
return rhashtable_lookup_fast(&c->vfs_inodes_table, &inum, bch2_vfs_inodes_params);
}
@ -184,7 +278,8 @@ static void __wait_on_freeing_inode(struct bch_fs *c,
subvol_inum inum)
{
wait_queue_head_t *wq;
DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
struct wait_bit_queue_entry wait;
wq = inode_bit_waitqueue(&wait, &inode->v, __I_NEW);
prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
spin_unlock(&inode->v.i_lock);
@ -252,7 +347,8 @@ static struct bch_inode_info *bch2_inode_hash_insert(struct bch_fs *c,
set_bit(EI_INODE_HASHED, &inode->ei_flags);
retry:
if (unlikely(rhashtable_lookup_insert_fast(&c->vfs_inodes_table,
if (unlikely(rhashtable_lookup_insert_key(&c->vfs_inodes_table,
&inode->ei_inum,
&inode->hash,
bch2_vfs_inodes_params))) {
old = bch2_inode_hash_find(c, trans, inode->ei_inum);

9
fs/bcachefs/fs.h
View File

@ -54,8 +54,6 @@ static inline subvol_inum inode_inum(struct bch_inode_info *inode)
return inode->ei_inum;
}
struct bch_inode_info *__bch2_inode_hash_find(struct bch_fs *, subvol_inum);
/*
* Set if we've gotten a btree error for this inode, and thus the vfs inode and
* btree inode may be inconsistent:
@ -148,6 +146,8 @@ struct bch_inode_info *
__bch2_create(struct mnt_idmap *, struct bch_inode_info *,
struct dentry *, umode_t, dev_t, subvol_inum, unsigned);
int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p);
int bch2_fs_quota_transfer(struct bch_fs *,
struct bch_inode_info *,
struct bch_qid,
@ -198,10 +198,7 @@ int bch2_vfs_init(void);
#define bch2_inode_update_after_write(_trans, _inode, _inode_u, _fields) ({ do {} while (0); })
static inline struct bch_inode_info *__bch2_inode_hash_find(struct bch_fs *c, subvol_inum inum)
{
return NULL;
}
static inline int bch2_inode_or_descendents_is_open(struct btree_trans *trans, struct bpos p) { return 0; }
static inline void bch2_evict_subvolume_inodes(struct bch_fs *c,
snapshot_id_list *s) {}

384
fs/bcachefs/fsck.c
View File

@ -326,17 +326,54 @@ err:
return ret;
}
static inline bool inode_should_reattach(struct bch_inode_unpacked *inode)
{
if (inode->bi_inum == BCACHEFS_ROOT_INO &&
inode->bi_subvol == BCACHEFS_ROOT_SUBVOL)
return false;
return !inode->bi_dir && !(inode->bi_flags & BCH_INODE_unlinked);
}
static int maybe_delete_dirent(struct btree_trans *trans, struct bpos d_pos, u32 snapshot)
{
struct btree_iter iter;
struct bkey_s_c k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_dirents,
SPOS(d_pos.inode, d_pos.offset, snapshot),
BTREE_ITER_intent|
BTREE_ITER_with_updates);
int ret = bkey_err(k);
if (ret)
return ret;
if (bpos_eq(k.k->p, d_pos)) {
/*
* delet_at() doesn't work because the update path doesn't
* internally use BTREE_ITER_with_updates yet
*/
struct bkey_i *k = bch2_trans_kmalloc(trans, sizeof(*k));
ret = PTR_ERR_OR_ZERO(k);
if (ret)
goto err;
bkey_init(&k->k);
k->k.type = KEY_TYPE_whiteout;
k->k.p = iter.pos;
ret = bch2_trans_update(trans, &iter, k, BTREE_UPDATE_internal_snapshot_node);
}
err:
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int reattach_inode(struct btree_trans *trans, struct bch_inode_unpacked *inode)
{
struct bch_fs *c = trans->c;
struct bch_hash_info dir_hash;
struct bch_inode_unpacked lostfound;
char name_buf[20];
struct qstr name;
u64 dir_offset = 0;
u32 dirent_snapshot = inode->bi_snapshot;
int ret;
u32 dirent_snapshot = inode->bi_snapshot;
if (inode->bi_subvol) {
inode->bi_parent_subvol = BCACHEFS_ROOT_SUBVOL;
@ -367,9 +404,10 @@ static int reattach_inode(struct btree_trans *trans, struct bch_inode_unpacked *
if (ret)
return ret;
dir_hash = bch2_hash_info_init(c, &lostfound);
struct bch_hash_info dir_hash = bch2_hash_info_init(c, &lostfound);
struct qstr name = (struct qstr) QSTR(name_buf);
name = (struct qstr) QSTR(name_buf);
inode->bi_dir = lostfound.bi_inum;
ret = bch2_dirent_create_snapshot(trans,
inode->bi_parent_subvol, lostfound.bi_inum,
@ -378,17 +416,70 @@ static int reattach_inode(struct btree_trans *trans, struct bch_inode_unpacked *
inode_d_type(inode),
&name,
inode->bi_subvol ?: inode->bi_inum,
&dir_offset,
&inode->bi_dir_offset,
STR_HASH_must_create);
if (ret) {
bch_err_msg(c, ret, "error creating dirent");
return ret;
}
inode->bi_dir = lostfound.bi_inum;
inode->bi_dir_offset = dir_offset;
ret = __bch2_fsck_write_inode(trans, inode);
if (ret)
return ret;
return __bch2_fsck_write_inode(trans, inode);
/*
* Fix up inodes in child snapshots: if they should also be reattached
* update the backpointer field, if they should not be we need to emit
* whiteouts for the dirent we just created.
*/
if (!inode->bi_subvol && bch2_snapshot_is_leaf(c, inode->bi_snapshot) <= 0) {
snapshot_id_list whiteouts_done;
struct btree_iter iter;
struct bkey_s_c k;
darray_init(&whiteouts_done);
for_each_btree_key_reverse_norestart(trans, iter,
BTREE_ID_inodes, SPOS(0, inode->bi_inum, inode->bi_snapshot - 1),
BTREE_ITER_all_snapshots|BTREE_ITER_intent, k, ret) {
if (k.k->p.offset != inode->bi_inum)
break;
if (!bkey_is_inode(k.k) ||
!bch2_snapshot_is_ancestor(c, k.k->p.snapshot, inode->bi_snapshot) ||
snapshot_list_has_ancestor(c, &whiteouts_done, k.k->p.snapshot))
continue;
struct bch_inode_unpacked child_inode;
bch2_inode_unpack(k, &child_inode);
if (!inode_should_reattach(&child_inode)) {
ret = maybe_delete_dirent(trans,
SPOS(lostfound.bi_inum, inode->bi_dir_offset,
dirent_snapshot),
k.k->p.snapshot);
if (ret)
break;
ret = snapshot_list_add(c, &whiteouts_done, k.k->p.snapshot);
if (ret)
break;
} else {
iter.snapshot = k.k->p.snapshot;
child_inode.bi_dir = inode->bi_dir;
child_inode.bi_dir_offset = inode->bi_dir_offset;
ret = bch2_inode_write_flags(trans, &iter, &child_inode,
BTREE_UPDATE_internal_snapshot_node);
if (ret)
break;
}
}
darray_exit(&whiteouts_done);
bch2_trans_iter_exit(trans, &iter);
}
return ret;
}
static int remove_backpointer(struct btree_trans *trans,
@ -994,7 +1085,6 @@ static int check_inode_dirent_inode(struct btree_trans *trans,
*/
inode->bi_dir = 0;
inode->bi_dir_offset = 0;
inode->bi_flags &= ~BCH_INODE_backptr_untrusted;
*write_inode = true;
}
@ -1006,28 +1096,11 @@ fsck_err:
return ret;
}
static bool bch2_inode_is_open(struct bch_fs *c, struct bpos p)
{
subvol_inum inum = {
.subvol = snapshot_t(c, p.snapshot)->subvol,
.inum = p.offset,
};
/* snapshot tree corruption, can't safely delete */
if (!inum.subvol) {
bch_warn_ratelimited(c, "%s(): snapshot %u has no subvol, unlinked but can't safely delete", __func__, p.snapshot);
return true;
}
return __bch2_inode_hash_find(c, inum) != NULL;
}
static int check_inode(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c k,
struct bch_inode_unpacked *prev,
struct snapshots_seen *s,
bool full)
struct snapshots_seen *s)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
@ -1050,12 +1123,6 @@ static int check_inode(struct btree_trans *trans,
BUG_ON(bch2_inode_unpack(k, &u));
if (!full &&
!(u.bi_flags & (BCH_INODE_i_size_dirty|
BCH_INODE_i_sectors_dirty|
BCH_INODE_unlinked)))
return 0;
if (prev->bi_inum != u.bi_inum)
*prev = u;
@ -1101,28 +1168,27 @@ static int check_inode(struct btree_trans *trans,
ret = 0;
}
if ((u.bi_flags & (BCH_INODE_i_size_dirty|BCH_INODE_unlinked)) &&
bch2_key_has_snapshot_overwrites(trans, BTREE_ID_inodes, k.k->p)) {
struct bpos new_min_pos;
ret = bch2_inode_has_child_snapshots(trans, k.k->p);
if (ret < 0)
goto err;
ret = bch2_propagate_key_to_snapshot_leaves(trans, iter->btree_id, k, &new_min_pos);
if (fsck_err_on(ret != !!(u.bi_flags & BCH_INODE_has_child_snapshot),
trans, inode_has_child_snapshots_wrong,
"inode has_child_snapshots flag wrong (should be %u)\n%s",
ret,
(printbuf_reset(&buf),
bch2_inode_unpacked_to_text(&buf, &u),
buf.buf))) {
if (ret)
goto err;
u.bi_flags &= ~BCH_INODE_i_size_dirty|BCH_INODE_unlinked;
ret = __bch2_fsck_write_inode(trans, &u);
bch_err_msg(c, ret, "in fsck updating inode");
if (ret)
goto err_noprint;
if (!bpos_eq(new_min_pos, POS_MIN))
bch2_btree_iter_set_pos(iter, bpos_predecessor(new_min_pos));
goto err_noprint;
u.bi_flags |= BCH_INODE_has_child_snapshot;
else
u.bi_flags &= ~BCH_INODE_has_child_snapshot;
do_update = true;
}
ret = 0;
if (u.bi_flags & BCH_INODE_unlinked) {
if ((u.bi_flags & BCH_INODE_unlinked) &&
!(u.bi_flags & BCH_INODE_has_child_snapshot)) {
if (!test_bit(BCH_FS_started, &c->flags)) {
/*
* If we're not in online fsck, don't delete unlinked
@ -1147,7 +1213,11 @@ static int check_inode(struct btree_trans *trans,
if (ret)
goto err;
} else {
if (fsck_err_on(!bch2_inode_is_open(c, k.k->p),
ret = bch2_inode_or_descendents_is_open(trans, k.k->p);
if (ret < 0)
goto err;
if (fsck_err_on(!ret,
trans, inode_unlinked_and_not_open,
"inode %llu%u unlinked and not open",
u.bi_inum, u.bi_snapshot)) {
@ -1155,69 +1225,10 @@ static int check_inode(struct btree_trans *trans,
bch_err_msg(c, ret, "in fsck deleting inode");
goto err_noprint;
}
ret = 0;
}
}
/* i_size_dirty is vestigal, since we now have logged ops for truncate * */
if (u.bi_flags & BCH_INODE_i_size_dirty &&
(!test_bit(BCH_FS_clean_recovery, &c->flags) ||
fsck_err(trans, inode_i_size_dirty_but_clean,
"filesystem marked clean, but inode %llu has i_size dirty",
u.bi_inum))) {
bch_verbose(c, "truncating inode %llu", u.bi_inum);
/*
* XXX: need to truncate partial blocks too here - or ideally
* just switch units to bytes and that issue goes away
*/
ret = bch2_btree_delete_range_trans(trans, BTREE_ID_extents,
SPOS(u.bi_inum, round_up(u.bi_size, block_bytes(c)) >> 9,
iter->pos.snapshot),
POS(u.bi_inum, U64_MAX),
0, NULL);
bch_err_msg(c, ret, "in fsck truncating inode");
if (ret)
return ret;
/*
* We truncated without our normal sector accounting hook, just
* make sure we recalculate it:
*/
u.bi_flags |= BCH_INODE_i_sectors_dirty;
u.bi_flags &= ~BCH_INODE_i_size_dirty;
do_update = true;
}
/* i_sectors_dirty is vestigal, i_sectors is always updated transactionally */
if (u.bi_flags & BCH_INODE_i_sectors_dirty &&
(!test_bit(BCH_FS_clean_recovery, &c->flags) ||
fsck_err(trans, inode_i_sectors_dirty_but_clean,
"filesystem marked clean, but inode %llu has i_sectors dirty",
u.bi_inum))) {
s64 sectors;
bch_verbose(c, "recounting sectors for inode %llu",
u.bi_inum);
sectors = bch2_count_inode_sectors(trans, u.bi_inum, iter->pos.snapshot);
if (sectors < 0) {
bch_err_msg(c, sectors, "in fsck recounting inode sectors");
return sectors;
}
u.bi_sectors = sectors;
u.bi_flags &= ~BCH_INODE_i_sectors_dirty;
do_update = true;
}
if (u.bi_flags & BCH_INODE_backptr_untrusted) {
u.bi_dir = 0;
u.bi_dir_offset = 0;
u.bi_flags &= ~BCH_INODE_backptr_untrusted;
do_update = true;
}
if (fsck_err_on(u.bi_parent_subvol &&
(u.bi_subvol == 0 ||
u.bi_subvol == BCACHEFS_ROOT_SUBVOL),
@ -1274,7 +1285,6 @@ err_noprint:
int bch2_check_inodes(struct bch_fs *c)
{
bool full = c->opts.fsck;
struct bch_inode_unpacked prev = { 0 };
struct snapshots_seen s;
@ -1285,13 +1295,104 @@ int bch2_check_inodes(struct bch_fs *c)
POS_MIN,
BTREE_ITER_prefetch|BTREE_ITER_all_snapshots, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
check_inode(trans, &iter, k, &prev, &s, full)));
check_inode(trans, &iter, k, &prev, &s)));
snapshots_seen_exit(&s);
bch_err_fn(c, ret);
return ret;
}
static int find_oldest_inode_needs_reattach(struct btree_trans *trans,
struct bch_inode_unpacked *inode)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bkey_s_c k;
int ret = 0;
/*
* We look for inodes to reattach in natural key order, leaves first,
* but we should do the reattach at the oldest version that needs to be
* reattached:
*/
for_each_btree_key_norestart(trans, iter,
BTREE_ID_inodes,
SPOS(0, inode->bi_inum, inode->bi_snapshot + 1),
BTREE_ITER_all_snapshots, k, ret) {
if (k.k->p.offset != inode->bi_inum)
break;
if (!bch2_snapshot_is_ancestor(c, inode->bi_snapshot, k.k->p.snapshot))
continue;
if (!bkey_is_inode(k.k))
break;
struct bch_inode_unpacked parent_inode;
bch2_inode_unpack(k, &parent_inode);
if (!inode_should_reattach(&parent_inode))
break;
*inode = parent_inode;
}
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int check_unreachable_inode(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c k)
{
struct printbuf buf = PRINTBUF;
int ret = 0;
if (!bkey_is_inode(k.k))
return 0;
struct bch_inode_unpacked inode;
BUG_ON(bch2_inode_unpack(k, &inode));
if (!inode_should_reattach(&inode))
return 0;
ret = find_oldest_inode_needs_reattach(trans, &inode);
if (ret)
return ret;
if (fsck_err(trans, inode_unreachable,
"unreachable inode:\n%s",
(bch2_inode_unpacked_to_text(&buf, &inode),
buf.buf)))
ret = reattach_inode(trans, &inode);
fsck_err:
printbuf_exit(&buf);
return ret;
}
/*
* Reattach unreachable (but not unlinked) inodes
*
* Run after check_inodes() and check_dirents(), so we node that inode
* backpointer fields point to valid dirents, and every inode that has a dirent
* that points to it has its backpointer field set - so we're just looking for
* non-unlinked inodes without backpointers:
*
* XXX: this is racy w.r.t. hardlink removal in online fsck
*/
int bch2_check_unreachable_inodes(struct bch_fs *c)
{
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, BTREE_ID_inodes,
POS_MIN,
BTREE_ITER_prefetch|BTREE_ITER_all_snapshots, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
check_unreachable_inode(trans, &iter, k)));
bch_err_fn(c, ret);
return ret;
}
static inline bool btree_matches_i_mode(enum btree_id btree, unsigned mode)
{
switch (btree) {
@ -1694,8 +1795,7 @@ static int check_extent(struct btree_trans *trans, struct btree_iter *iter,
!key_visible_in_snapshot(c, s, i->snapshot, k.k->p.snapshot))
continue;
if (fsck_err_on(!(i->inode.bi_flags & BCH_INODE_i_size_dirty) &&
k.k->p.offset > round_up(i->inode.bi_size, block_bytes(c)) >> 9 &&
if (fsck_err_on(k.k->p.offset > round_up(i->inode.bi_size, block_bytes(c)) >> 9 &&
!bkey_extent_is_reservation(k),
trans, extent_past_end_of_inode,
"extent type past end of inode %llu:%u, i_size %llu\n %s",
@ -2450,22 +2550,6 @@ static int check_subvol_path(struct btree_trans *trans, struct btree_iter *iter,
if (ret)
break;
/*
* We've checked that inode backpointers point to valid dirents;
* here, it's sufficient to check that the subvolume root has a
* dirent:
*/
if (fsck_err_on(!subvol_root.bi_dir,
trans, subvol_unreachable,
"unreachable subvolume %s",
(bch2_bkey_val_to_text(&buf, c, s.s_c),
prt_newline(&buf),
bch2_inode_unpacked_to_text(&buf, &subvol_root),
buf.buf))) {
ret = reattach_subvol(trans, s);
break;
}
u32 parent = le32_to_cpu(s.v->fs_path_parent);
if (darray_u32_has(&subvol_path, parent)) {
@ -2526,12 +2610,6 @@ static bool path_is_dup(pathbuf *p, u64 inum, u32 snapshot)
return false;
}
/*
* Check that a given inode is reachable from its subvolume root - we already
* verified subvolume connectivity:
*
* XXX: we should also be verifying that inodes are in the right subvolumes
*/
static int check_path(struct btree_trans *trans, pathbuf *p, struct bkey_s_c inode_k)
{
struct bch_fs *c = trans->c;
@ -2545,6 +2623,9 @@ static int check_path(struct btree_trans *trans, pathbuf *p, struct bkey_s_c ino
BUG_ON(bch2_inode_unpack(inode_k, &inode));
if (!S_ISDIR(inode.bi_mode))
return 0;
while (!inode.bi_subvol) {
struct btree_iter dirent_iter;
struct bkey_s_c_dirent d;
@ -2559,21 +2640,15 @@ static int check_path(struct btree_trans *trans, pathbuf *p, struct bkey_s_c ino
bch2_trans_iter_exit(trans, &dirent_iter);
if (bch2_err_matches(ret, ENOENT)) {
ret = 0;
if (fsck_err(trans, inode_unreachable,
"unreachable inode\n%s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, inode_k),
buf.buf)))
ret = reattach_inode(trans, &inode);
printbuf_reset(&buf);
bch2_bkey_val_to_text(&buf, c, inode_k);
bch_err(c, "unreachable inode in check_directory_structure: %s\n%s",
bch2_err_str(ret), buf.buf);
goto out;
}
bch2_trans_iter_exit(trans, &dirent_iter);
if (!S_ISDIR(inode.bi_mode))
break;
ret = darray_push(p, ((struct pathbuf_entry) {
.inum = inode.bi_inum,
.snapshot = snapshot,
@ -2626,9 +2701,8 @@ fsck_err:
}
/*
* Check for unreachable inodes, as well as loops in the directory structure:
* After bch2_check_dirents(), if an inode backpointer doesn't exist that means it's
* unreachable:
* Check for loops in the directory structure: all other connectivity issues
* have been fixed by prior passes
*/
int bch2_check_directory_structure(struct bch_fs *c)
{
@ -2756,6 +2830,10 @@ static int check_nlinks_find_hardlinks(struct bch_fs *c,
if (S_ISDIR(u.bi_mode))
continue;
/*
* Previous passes ensured that bi_nlink is nonzero if
* it had multiple hardlinks:
*/
if (!u.bi_nlink)
continue;

1
fs/bcachefs/fsck.h
View File

@ -9,6 +9,7 @@ int bch2_check_dirents(struct bch_fs *);
int bch2_check_xattrs(struct bch_fs *);
int bch2_check_root(struct bch_fs *);
int bch2_check_subvolume_structure(struct bch_fs *);
int bch2_check_unreachable_inodes(struct bch_fs *);
int bch2_check_directory_structure(struct bch_fs *);
int bch2_check_nlinks(struct bch_fs *);
int bch2_fix_reflink_p(struct bch_fs *);

275
fs/bcachefs/inode.c
View File

@ -12,6 +12,7 @@
#include "error.h"
#include "extents.h"
#include "extent_update.h"
#include "fs.h"
#include "inode.h"
#include "str_hash.h"
#include "snapshot.h"
@ -34,6 +35,8 @@ static const char * const bch2_inode_flag_strs[] = {
};
#undef x
static int delete_ancestor_snapshot_inodes(struct btree_trans *, struct bpos);
static const u8 byte_table[8] = { 1, 2, 3, 4, 6, 8, 10, 13 };
static int inode_decode_field(const u8 *in, const u8 *end,
@ -575,9 +578,137 @@ static inline u64 bkey_inode_flags(struct bkey_s_c k)
}
}
static inline bool bkey_is_deleted_inode(struct bkey_s_c k)
static inline void bkey_inode_flags_set(struct bkey_s k, u64 f)
{
return bkey_inode_flags(k) & BCH_INODE_unlinked;
switch (k.k->type) {
case KEY_TYPE_inode:
bkey_s_to_inode(k).v->bi_flags = cpu_to_le32(f);
return;
case KEY_TYPE_inode_v2:
bkey_s_to_inode_v2(k).v->bi_flags = cpu_to_le64(f);
return;
case KEY_TYPE_inode_v3:
bkey_s_to_inode_v3(k).v->bi_flags = cpu_to_le64(f);
return;
default:
BUG();
}
}
static inline bool bkey_is_unlinked_inode(struct bkey_s_c k)
{
unsigned f = bkey_inode_flags(k) & BCH_INODE_unlinked;
return (f & BCH_INODE_unlinked) && !(f & BCH_INODE_has_child_snapshot);
}
static struct bkey_s_c
bch2_bkey_get_iter_snapshot_parent(struct btree_trans *trans, struct btree_iter *iter,
enum btree_id btree, struct bpos pos,
unsigned flags)
{
struct bch_fs *c = trans->c;
struct bkey_s_c k;
int ret = 0;
for_each_btree_key_upto_norestart(trans, *iter, btree,
bpos_successor(pos),
SPOS(pos.inode, pos.offset, U32_MAX),
flags|BTREE_ITER_all_snapshots, k, ret)
if (bch2_snapshot_is_ancestor(c, pos.snapshot, k.k->p.snapshot))
return k;
bch2_trans_iter_exit(trans, iter);
return ret ? bkey_s_c_err(ret) : bkey_s_c_null;
}
static struct bkey_s_c
bch2_inode_get_iter_snapshot_parent(struct btree_trans *trans, struct btree_iter *iter,
struct bpos pos, unsigned flags)
{
struct bkey_s_c k;
again:
k = bch2_bkey_get_iter_snapshot_parent(trans, iter, BTREE_ID_inodes, pos, flags);
if (!k.k ||
bkey_err(k) ||
bkey_is_inode(k.k))
return k;
bch2_trans_iter_exit(trans, iter);
pos = k.k->p;
goto again;
}
int __bch2_inode_has_child_snapshots(struct btree_trans *trans, struct bpos pos)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bkey_s_c k;
int ret = 0;
for_each_btree_key_upto_norestart(trans, iter,
BTREE_ID_inodes, POS(0, pos.offset), bpos_predecessor(pos),
BTREE_ITER_all_snapshots|
BTREE_ITER_with_updates, k, ret)
if (bch2_snapshot_is_ancestor(c, k.k->p.snapshot, pos.snapshot) &&
bkey_is_inode(k.k)) {
ret = 1;
break;
}
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int update_inode_has_children(struct btree_trans *trans,
struct bkey_s k,
bool have_child)
{
if (!have_child) {
int ret = bch2_inode_has_child_snapshots(trans, k.k->p);
if (ret)
return ret < 0 ? ret : 0;
}
u64 f = bkey_inode_flags(k.s_c);
if (have_child != !!(f & BCH_INODE_has_child_snapshot))
bkey_inode_flags_set(k, f ^ BCH_INODE_has_child_snapshot);
return 0;
}
static int update_parent_inode_has_children(struct btree_trans *trans, struct bpos pos,
bool have_child)
{
struct btree_iter iter;
struct bkey_s_c k = bch2_inode_get_iter_snapshot_parent(trans,
&iter, pos, BTREE_ITER_with_updates);
int ret = bkey_err(k);
if (ret)
return ret;
if (!k.k)
return 0;
if (!have_child) {
ret = bch2_inode_has_child_snapshots(trans, k.k->p);
if (ret) {
ret = ret < 0 ? ret : 0;
goto err;
}
}
u64 f = bkey_inode_flags(k);
if (have_child != !!(f & BCH_INODE_has_child_snapshot)) {
struct bkey_i *update = bch2_bkey_make_mut(trans, &iter, &k,
BTREE_UPDATE_internal_snapshot_node);
ret = PTR_ERR_OR_ZERO(update);
if (ret)
goto err;
bkey_inode_flags_set(bkey_i_to_s(update), f ^ BCH_INODE_has_child_snapshot);
}
err:
bch2_trans_iter_exit(trans, &iter);
return ret;
}
int bch2_trigger_inode(struct btree_trans *trans,
@ -586,6 +717,8 @@ int bch2_trigger_inode(struct btree_trans *trans,
struct bkey_s new,
enum btree_iter_update_trigger_flags flags)
{
struct bch_fs *c = trans->c;
if ((flags & BTREE_TRIGGER_atomic) && (flags & BTREE_TRIGGER_insert)) {
BUG_ON(!trans->journal_res.seq);
bkey_s_to_inode_v3(new).v->bi_journal_seq = cpu_to_le64(trans->journal_res.seq);
@ -599,13 +732,41 @@ int bch2_trigger_inode(struct btree_trans *trans,
return ret;
}
int deleted_delta = (int) bkey_is_deleted_inode(new.s_c) -
(int) bkey_is_deleted_inode(old);
if ((flags & BTREE_TRIGGER_transactional) && deleted_delta) {
int ret = bch2_btree_bit_mod_buffered(trans, BTREE_ID_deleted_inodes,
new.k->p, deleted_delta > 0);
if (ret)
return ret;
if (flags & BTREE_TRIGGER_transactional) {
int unlinked_delta = (int) bkey_is_unlinked_inode(new.s_c) -
(int) bkey_is_unlinked_inode(old);
if (unlinked_delta) {
int ret = bch2_btree_bit_mod_buffered(trans, BTREE_ID_deleted_inodes,
new.k->p, unlinked_delta > 0);
if (ret)
return ret;
}
/*
* If we're creating or deleting an inode at this snapshot ID,
* and there might be an inode in a parent snapshot ID, we might
* need to set or clear the has_child_snapshot flag on the
* parent.
*/
int deleted_delta = (int) bkey_is_inode(new.k) -
(int) bkey_is_inode(old.k);
if (deleted_delta &&
bch2_snapshot_parent(c, new.k->p.snapshot)) {
int ret = update_parent_inode_has_children(trans, new.k->p,
deleted_delta > 0);
if (ret)
return ret;
}
/*
* When an inode is first updated in a new snapshot, we may need
* to clear has_child_snapshot
*/
if (deleted_delta > 0) {
int ret = update_inode_has_children(trans, new, false);
if (ret)
return ret;
}
}
return 0;
@ -888,6 +1049,11 @@ err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
if (ret)
goto err2;
ret = delete_ancestor_snapshot_inodes(trans, SPOS(0, inum.inum, snapshot));
err2:
bch2_trans_put(trans);
return ret;
}
@ -992,7 +1158,7 @@ int bch2_inum_opts_get(struct btree_trans *trans, subvol_inum inum, struct bch_i
return 0;
}
int bch2_inode_rm_snapshot(struct btree_trans *trans, u64 inum, u32 snapshot)
static noinline int __bch2_inode_rm_snapshot(struct btree_trans *trans, u64 inum, u32 snapshot)
{
struct bch_fs *c = trans->c;
struct btree_iter iter = { NULL };
@ -1055,6 +1221,45 @@ err:
return ret ?: -BCH_ERR_transaction_restart_nested;
}
/*
* After deleting an inode, there may be versions in older snapshots that should
* also be deleted - if they're not referenced by sibling snapshots and not open
* in other subvolumes:
*/
static int delete_ancestor_snapshot_inodes(struct btree_trans *trans, struct bpos pos)
{
struct btree_iter iter;
struct bkey_s_c k;
int ret;
next_parent:
ret = lockrestart_do(trans,
bkey_err(k = bch2_inode_get_iter_snapshot_parent(trans, &iter, pos, 0)));
if (ret || !k.k)
return ret;
bool unlinked = bkey_is_unlinked_inode(k);
pos = k.k->p;
bch2_trans_iter_exit(trans, &iter);
if (!unlinked)
return 0;
ret = lockrestart_do(trans, bch2_inode_or_descendents_is_open(trans, pos));
if (ret)
return ret < 0 ? ret : 0;
ret = __bch2_inode_rm_snapshot(trans, pos.offset, pos.snapshot);
if (ret)
return ret;
goto next_parent;
}
int bch2_inode_rm_snapshot(struct btree_trans *trans, u64 inum, u32 snapshot)
{
return __bch2_inode_rm_snapshot(trans, inum, snapshot) ?:
delete_ancestor_snapshot_inodes(trans, SPOS(0, inum, snapshot));
}
static int may_delete_deleted_inode(struct btree_trans *trans,
struct btree_iter *iter,
struct bpos pos,
@ -1064,6 +1269,7 @@ static int may_delete_deleted_inode(struct btree_trans *trans,
struct btree_iter inode_iter;
struct bkey_s_c k;
struct bch_inode_unpacked inode;
struct printbuf buf = PRINTBUF;
int ret;
k = bch2_bkey_get_iter(trans, &inode_iter, BTREE_ID_inodes, pos, BTREE_ITER_cached);
@ -1099,6 +1305,31 @@ static int may_delete_deleted_inode(struct btree_trans *trans,
pos.offset, pos.snapshot))
goto delete;
if (fsck_err_on(inode.bi_flags & BCH_INODE_has_child_snapshot,
trans, deleted_inode_has_child_snapshots,
"inode with child snapshots %llu:%u in deleted_inodes btree",
pos.offset, pos.snapshot))
goto delete;
ret = bch2_inode_has_child_snapshots(trans, k.k->p);
if (ret < 0)
goto out;
if (ret) {
if (fsck_err(trans, inode_has_child_snapshots_wrong,
"inode has_child_snapshots flag wrong (should be set)\n%s",
(printbuf_reset(&buf),
bch2_inode_unpacked_to_text(&buf, &inode),
buf.buf))) {
inode.bi_flags |= BCH_INODE_has_child_snapshot;
ret = __bch2_fsck_write_inode(trans, &inode);
if (ret)
goto out;
}
goto delete;
}
if (test_bit(BCH_FS_clean_recovery, &c->flags) &&
!fsck_err(trans, deleted_inode_but_clean,
"filesystem marked as clean but have deleted inode %llu:%u",
@ -1107,33 +1338,11 @@ static int may_delete_deleted_inode(struct btree_trans *trans,
goto out;
}
if (bch2_snapshot_is_internal_node(c, pos.snapshot)) {
struct bpos new_min_pos;
ret = bch2_propagate_key_to_snapshot_leaves(trans, inode_iter.btree_id, k, &new_min_pos);
if (ret)
goto out;
inode.bi_flags &= ~BCH_INODE_unlinked;
ret = bch2_inode_write_flags(trans, &inode_iter, &inode,
BTREE_UPDATE_internal_snapshot_node);
bch_err_msg(c, ret, "clearing inode unlinked flag");
if (ret)
goto out;
/*
* We'll need another write buffer flush to pick up the new
* unlinked inodes in the snapshot leaves:
*/
*need_another_pass = true;
goto out;
}
ret = 1;
out:
fsck_err:
bch2_trans_iter_exit(trans, &inode_iter);
printbuf_exit(&buf);
return ret;
delete:
ret = bch2_btree_bit_mod_buffered(trans, BTREE_ID_deleted_inodes, pos, false);

10
fs/bcachefs/inode.h
View File

@ -5,6 +5,7 @@
#include "bkey.h"
#include "bkey_methods.h"
#include "opts.h"
#include "snapshot.h"
enum bch_validate_flags;
extern const char * const bch2_inode_opts[];
@ -17,6 +18,15 @@ int bch2_inode_v3_validate(struct bch_fs *, struct bkey_s_c,
enum bch_validate_flags);
void bch2_inode_to_text(struct printbuf *, struct bch_fs *, struct bkey_s_c);
int __bch2_inode_has_child_snapshots(struct btree_trans *, struct bpos);
static inline int bch2_inode_has_child_snapshots(struct btree_trans *trans, struct bpos pos)
{
return bch2_snapshot_is_leaf(trans->c, pos.snapshot) <= 0
? __bch2_inode_has_child_snapshots(trans, pos)
: 0;
}
int bch2_trigger_inode(struct btree_trans *, enum btree_id, unsigned,
struct bkey_s_c, struct bkey_s,
enum btree_iter_update_trigger_flags);

3
fs/bcachefs/inode_format.h
View File

@ -133,7 +133,8 @@ enum inode_opt_id {
x(i_size_dirty, 5) \
x(i_sectors_dirty, 6) \
x(unlinked, 7) \
x(backptr_untrusted, 8)
x(backptr_untrusted, 8) \
x(has_child_snapshot, 9)
/* bits 20+ reserved for packed fields below: */

13
fs/bcachefs/journal.c
View File

@ -603,6 +603,19 @@ int bch2_journal_res_get_slowpath(struct journal *j, struct journal_res *res,
{
int ret;
if (closure_wait_event_timeout(&j->async_wait,
(ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked ||
(flags & JOURNAL_RES_GET_NONBLOCK),
HZ * 10))
return ret;
struct bch_fs *c = container_of(j, struct bch_fs, journal);
struct printbuf buf = PRINTBUF;
bch2_journal_debug_to_text(&buf, j);
bch_err(c, "Journal stuck? Waited for 10 seconds...\n%s",
buf.buf);
printbuf_exit(&buf);
closure_wait_event(&j->async_wait,
(ret = __journal_res_get(j, res, flags)) != -BCH_ERR_journal_res_get_blocked ||
(flags & JOURNAL_RES_GET_NONBLOCK));

4
fs/bcachefs/opts.c
View File

@ -427,7 +427,9 @@ void bch2_opt_to_text(struct printbuf *out,
prt_printf(out, "%lli", v);
break;
case BCH_OPT_STR:
if (flags & OPT_SHOW_FULL_LIST)
if (v < opt->min || v >= opt->max - 1)
prt_printf(out, "(invalid option %lli)", v);
else if (flags & OPT_SHOW_FULL_LIST)
prt_string_option(out, opt->choices, v);
else
prt_str(out, opt->choices[v]);

3
fs/bcachefs/recovery.c
View File

@ -287,7 +287,8 @@ int bch2_journal_replay(struct bch_fs *c)
BCH_TRANS_COMMIT_no_enospc|
BCH_TRANS_COMMIT_journal_reclaim|
BCH_TRANS_COMMIT_skip_accounting_apply|
BCH_TRANS_COMMIT_no_journal_res,
BCH_TRANS_COMMIT_no_journal_res|
BCH_WATERMARK_reclaim,
bch2_journal_replay_accounting_key(trans, k));
if (bch2_fs_fatal_err_on(ret, c, "error replaying accounting; %s", bch2_err_str(ret)))
goto err;

1
fs/bcachefs/recovery_passes_types.h
View File

@ -46,6 +46,7 @@
x(check_dirents, 27, PASS_FSCK) \
x(check_xattrs, 28, PASS_FSCK) \
x(check_root, 29, PASS_ONLINE|PASS_FSCK) \
x(check_unreachable_inodes, 40, PASS_ONLINE|PASS_FSCK) \
x(check_subvolume_structure, 36, PASS_ONLINE|PASS_FSCK) \
x(check_directory_structure, 30, PASS_ONLINE|PASS_FSCK) \
x(check_nlinks, 31, PASS_FSCK) \

39
fs/bcachefs/replicas.c
View File

@ -66,9 +66,9 @@ void bch2_replicas_entry_to_text(struct printbuf *out,
prt_printf(out, "]");
}
static int bch2_replicas_entry_validate_locked(struct bch_replicas_entry_v1 *r,
struct bch_sb *sb,
struct printbuf *err)
static int bch2_replicas_entry_sb_validate(struct bch_replicas_entry_v1 *r,
struct bch_sb *sb,
struct printbuf *err)
{
if (!r->nr_devs) {
prt_printf(err, "no devices in entry ");
@ -98,10 +98,28 @@ int bch2_replicas_entry_validate(struct bch_replicas_entry_v1 *r,
struct bch_fs *c,
struct printbuf *err)
{
mutex_lock(&c->sb_lock);
int ret = bch2_replicas_entry_validate_locked(r, c->disk_sb.sb, err);
mutex_unlock(&c->sb_lock);
return ret;
if (!r->nr_devs) {
prt_printf(err, "no devices in entry ");
goto bad;
}
if (r->nr_required > 1 &&
r->nr_required >= r->nr_devs) {
prt_printf(err, "bad nr_required in entry ");
goto bad;
}
for (unsigned i = 0; i < r->nr_devs; i++)
if (r->devs[i] != BCH_SB_MEMBER_INVALID &&
!bch2_dev_exists(c, r->devs[i])) {
prt_printf(err, "invalid device %u in entry ", r->devs[i]);
goto bad;
}
return 0;
bad:
bch2_replicas_entry_to_text(err, r);
return -BCH_ERR_invalid_replicas_entry;
}
void bch2_cpu_replicas_to_text(struct printbuf *out,
@ -686,7 +704,7 @@ static int bch2_cpu_replicas_validate(struct bch_replicas_cpu *cpu_r,
struct bch_replicas_entry_v1 *e =
cpu_replicas_entry(cpu_r, i);
int ret = bch2_replicas_entry_validate_locked(e, sb, err);
int ret = bch2_replicas_entry_sb_validate(e, sb, err);
if (ret)
return ret;
@ -803,6 +821,11 @@ bool bch2_have_enough_devs(struct bch_fs *c, struct bch_devs_mask devs,
rcu_read_lock();
for (unsigned i = 0; i < e->nr_devs; i++) {
if (e->devs[i] == BCH_SB_MEMBER_INVALID) {
nr_failed++;
continue;
}
nr_online += test_bit(e->devs[i], devs.d);
struct bch_dev *ca = bch2_dev_rcu_noerror(c, e->devs[i]);

5
fs/bcachefs/sb-downgrade.c
View File

@ -78,7 +78,10 @@
BCH_FSCK_ERR_accounting_mismatch) \
x(rebalance_work_acct_fix, \
BIT_ULL(BCH_RECOVERY_PASS_check_allocations), \
BCH_FSCK_ERR_accounting_mismatch)
BCH_FSCK_ERR_accounting_mismatch) \
x(inode_has_child_snapshots, \
BIT_ULL(BCH_RECOVERY_PASS_check_inodes), \
BCH_FSCK_ERR_inode_has_child_snapshots_wrong)
#define DOWNGRADE_TABLE() \
x(bucket_stripe_sectors, \

6
fs/bcachefs/sb-errors_format.h
View File

@ -180,6 +180,7 @@ enum bch_fsck_flags {
x(reflink_p_to_missing_reflink_v, 166, 0) \
x(stripe_pos_bad, 167, 0) \
x(stripe_val_size_bad, 168, 0) \
x(stripe_csum_granularity_bad, 290, 0) \
x(stripe_sector_count_wrong, 169, 0) \
x(snapshot_tree_pos_bad, 170, 0) \
x(snapshot_tree_to_missing_snapshot, 171, 0) \
@ -225,11 +226,13 @@ enum bch_fsck_flags {
x(inode_multiple_links_but_nlink_0, 207, FSCK_AUTOFIX) \
x(inode_wrong_backpointer, 208, FSCK_AUTOFIX) \
x(inode_wrong_nlink, 209, FSCK_AUTOFIX) \
x(inode_has_child_snapshots_wrong, 287, 0) \
x(inode_unreachable, 210, FSCK_AUTOFIX) \
x(deleted_inode_but_clean, 211, FSCK_AUTOFIX) \
x(deleted_inode_missing, 212, FSCK_AUTOFIX) \
x(deleted_inode_is_dir, 213, FSCK_AUTOFIX) \
x(deleted_inode_not_unlinked, 214, FSCK_AUTOFIX) \
x(deleted_inode_has_child_snapshots, 288, FSCK_AUTOFIX) \
x(extent_overlapping, 215, 0) \
x(key_in_missing_inode, 216, 0) \
x(key_in_wrong_inode_type, 217, 0) \
@ -289,6 +292,7 @@ enum bch_fsck_flags {
x(alloc_key_stripe_sectors_wrong, 271, FSCK_AUTOFIX) \
x(accounting_mismatch, 272, FSCK_AUTOFIX) \
x(accounting_replicas_not_marked, 273, 0) \
x(accounting_to_invalid_device, 289, 0) \
x(invalid_btree_id, 274, 0) \
x(alloc_key_io_time_bad, 275, 0) \
x(alloc_key_fragmentation_lru_wrong, 276, FSCK_AUTOFIX) \
@ -298,7 +302,7 @@ enum bch_fsck_flags {
x(accounting_key_replicas_devs_unsorted, 280, FSCK_AUTOFIX) \
x(accounting_key_version_0, 282, FSCK_AUTOFIX) \
x(logged_op_but_clean, 283, FSCK_AUTOFIX) \
x(MAX, 287, 0)
x(MAX, 291, 0)
enum bch_sb_error_id {
#define x(t, n, ...) BCH_FSCK_ERR_##t = n,

10
fs/bcachefs/sb-members.c
View File

@ -163,6 +163,11 @@ static int validate_member(struct printbuf *err,
return -BCH_ERR_invalid_sb_members;
}
if (m.btree_bitmap_shift >= 64) {
prt_printf(err, "device %u: invalid btree_bitmap_shift %u", i, m.btree_bitmap_shift);
return -BCH_ERR_invalid_sb_members;
}
return 0;
}
@ -247,7 +252,10 @@ static void member_to_text(struct printbuf *out,
prt_newline(out);
prt_printf(out, "Btree allocated bitmap blocksize:\t");
prt_units_u64(out, 1ULL << m.btree_bitmap_shift);
if (m.btree_bitmap_shift < 64)
prt_units_u64(out, 1ULL << m.btree_bitmap_shift);
else
prt_printf(out, "(invalid shift %u)", m.btree_bitmap_shift);
prt_newline(out);
prt_printf(out, "Btree allocated bitmap:\t");

129
fs/bcachefs/snapshot.c
View File

@ -905,12 +905,30 @@ static int check_snapshot_exists(struct btree_trans *trans, u32 id)
if (bch2_snapshot_equiv(c, id))
return 0;
/* 0 is an invalid tree ID */
/* Do we need to reconstruct the snapshot_tree entry as well? */
struct btree_iter iter;
struct bkey_s_c k;
int ret = 0;
u32 tree_id = 0;
int ret = bch2_snapshot_tree_create(trans, id, 0, &tree_id);
for_each_btree_key_norestart(trans, iter, BTREE_ID_snapshot_trees, POS_MIN,
0, k, ret) {
if (le32_to_cpu(bkey_s_c_to_snapshot_tree(k).v->root_snapshot) == id) {
tree_id = k.k->p.offset;
break;
}
}
bch2_trans_iter_exit(trans, &iter);
if (ret)
return ret;
if (!tree_id) {
ret = bch2_snapshot_tree_create(trans, id, 0, &tree_id);
if (ret)
return ret;
}
struct bkey_i_snapshot *snapshot = bch2_trans_kmalloc(trans, sizeof(*snapshot));
ret = PTR_ERR_OR_ZERO(snapshot);
if (ret)
@ -921,6 +939,16 @@ static int check_snapshot_exists(struct btree_trans *trans, u32 id)
snapshot->v.tree = cpu_to_le32(tree_id);
snapshot->v.btime.lo = cpu_to_le64(bch2_current_time(c));
for_each_btree_key_norestart(trans, iter, BTREE_ID_subvolumes, POS_MIN,
0, k, ret) {
if (le32_to_cpu(bkey_s_c_to_subvolume(k).v->snapshot) == id) {
snapshot->v.subvol = cpu_to_le32(k.k->p.offset);
SET_BCH_SNAPSHOT_SUBVOL(&snapshot->v, true);
break;
}
}
bch2_trans_iter_exit(trans, &iter);
return bch2_btree_insert_trans(trans, BTREE_ID_snapshots, &snapshot->k_i, 0) ?:
bch2_mark_snapshot(trans, BTREE_ID_snapshots, 0,
bkey_s_c_null, bkey_i_to_s(&snapshot->k_i), 0) ?:
@ -1732,103 +1760,6 @@ int __bch2_key_has_snapshot_overwrites(struct btree_trans *trans,
return ret;
}
static u32 bch2_snapshot_smallest_child(struct bch_fs *c, u32 id)
{
const struct snapshot_t *s = snapshot_t(c, id);
return s->children[1] ?: s->children[0];
}
static u32 bch2_snapshot_smallest_descendent(struct bch_fs *c, u32 id)
{
u32 child;
while ((child = bch2_snapshot_smallest_child(c, id)))
id = child;
return id;
}
static int bch2_propagate_key_to_snapshot_leaf(struct btree_trans *trans,
enum btree_id btree,
struct bkey_s_c interior_k,
u32 leaf_id, struct bpos *new_min_pos)
{
struct btree_iter iter;
struct bpos pos = interior_k.k->p;
struct bkey_s_c k;
struct bkey_i *new;
int ret;
pos.snapshot = leaf_id;
bch2_trans_iter_init(trans, &iter, btree, pos, BTREE_ITER_intent);
k = bch2_btree_iter_peek_slot(&iter);
ret = bkey_err(k);
if (ret)
goto out;
/* key already overwritten in this snapshot? */
if (k.k->p.snapshot != interior_k.k->p.snapshot)
goto out;
if (bpos_eq(*new_min_pos, POS_MIN)) {
*new_min_pos = k.k->p;
new_min_pos->snapshot = leaf_id;
}
new = bch2_bkey_make_mut_noupdate(trans, interior_k);
ret = PTR_ERR_OR_ZERO(new);
if (ret)
goto out;
new->k.p.snapshot = leaf_id;
ret = bch2_trans_update(trans, &iter, new, 0);
out:
bch2_set_btree_iter_dontneed(&iter);
bch2_trans_iter_exit(trans, &iter);
return ret;
}
int bch2_propagate_key_to_snapshot_leaves(struct btree_trans *trans,
enum btree_id btree,
struct bkey_s_c k,
struct bpos *new_min_pos)
{
struct bch_fs *c = trans->c;
struct bkey_buf sk;
u32 restart_count = trans->restart_count;
int ret = 0;
bch2_bkey_buf_init(&sk);
bch2_bkey_buf_reassemble(&sk, c, k);
k = bkey_i_to_s_c(sk.k);
*new_min_pos = POS_MIN;
for (u32 id = bch2_snapshot_smallest_descendent(c, k.k->p.snapshot);
id < k.k->p.snapshot;
id++) {
if (!bch2_snapshot_is_ancestor(c, id, k.k->p.snapshot) ||
!bch2_snapshot_is_leaf(c, id))
continue;
again:
ret = btree_trans_too_many_iters(trans) ?:
bch2_propagate_key_to_snapshot_leaf(trans, btree, k, id, new_min_pos) ?:
bch2_trans_commit(trans, NULL, NULL, 0);
if (ret && bch2_err_matches(ret, BCH_ERR_transaction_restart)) {
bch2_trans_begin(trans);
goto again;
}
if (ret)
break;
}
bch2_bkey_buf_exit(&sk, c);
return ret ?: trans_was_restarted(trans, restart_count);
}
static int bch2_check_snapshot_needs_deletion(struct btree_trans *trans, struct bkey_s_c k)
{
struct bch_fs *c = trans->c;

3
fs/bcachefs/snapshot.h
View File

@ -259,9 +259,6 @@ static inline int bch2_key_has_snapshot_overwrites(struct btree_trans *trans,
return __bch2_key_has_snapshot_overwrites(trans, id, pos);
}
int bch2_propagate_key_to_snapshot_leaves(struct btree_trans *, enum btree_id,
struct bkey_s_c, struct bpos *);
int bch2_snapshots_read(struct bch_fs *);
void bch2_fs_snapshots_exit(struct bch_fs *);

34
fs/bcachefs/super.c
View File

@ -184,6 +184,7 @@ static DEFINE_MUTEX(bch_fs_list_lock);
DECLARE_WAIT_QUEUE_HEAD(bch2_read_only_wait);
static void bch2_dev_unlink(struct bch_dev *);
static void bch2_dev_free(struct bch_dev *);
static int bch2_dev_alloc(struct bch_fs *, unsigned);
static int bch2_dev_sysfs_online(struct bch_fs *, struct bch_dev *);
@ -620,9 +621,7 @@ void __bch2_fs_stop(struct bch_fs *c)
up_write(&c->state_lock);
for_each_member_device(c, ca)
if (ca->kobj.state_in_sysfs &&
ca->disk_sb.bdev)
sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
bch2_dev_unlink(ca);
if (c->kobj.state_in_sysfs)
kobject_del(&c->kobj);
@ -1187,9 +1186,7 @@ static void bch2_dev_free(struct bch_dev *ca)
{
cancel_work_sync(&ca->io_error_work);
if (ca->kobj.state_in_sysfs &&
ca->disk_sb.bdev)
sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
bch2_dev_unlink(ca);
if (ca->kobj.state_in_sysfs)
kobject_del(&ca->kobj);
@ -1226,10 +1223,7 @@ static void __bch2_dev_offline(struct bch_fs *c, struct bch_dev *ca)
percpu_ref_kill(&ca->io_ref);
wait_for_completion(&ca->io_ref_completion);
if (ca->kobj.state_in_sysfs) {
sysfs_remove_link(bdev_kobj(ca->disk_sb.bdev), "bcachefs");
sysfs_remove_link(&ca->kobj, "block");
}
bch2_dev_unlink(ca);
bch2_free_super(&ca->disk_sb);
bch2_dev_journal_exit(ca);
@ -1251,6 +1245,26 @@ static void bch2_dev_io_ref_complete(struct percpu_ref *ref)
complete(&ca->io_ref_completion);
}
static void bch2_dev_unlink(struct bch_dev *ca)
{
struct kobject *b;
/*
* This is racy w.r.t. the underlying block device being hot-removed,
* which removes it from sysfs.
*
* It'd be lovely if we had a way to handle this race, but the sysfs
* code doesn't appear to provide a good method and block/holder.c is
* susceptible as well:
*/
if (ca->kobj.state_in_sysfs &&
ca->disk_sb.bdev &&
(b = bdev_kobj(ca->disk_sb.bdev))->state_in_sysfs) {
sysfs_remove_link(b, "bcachefs");
sysfs_remove_link(&ca->kobj, "block");
}
}
static int bch2_dev_sysfs_online(struct bch_fs *c, struct bch_dev *ca)
{
int ret;

35
include/linux/closure.h
View File

@ -454,4 +454,39 @@ do { \
__closure_wait_event(waitlist, _cond); \
} while (0)
#define __closure_wait_event_timeout(waitlist, _cond, _until) \
({ \
struct closure cl; \
long _t; \
\
closure_init_stack(&cl); \
\
while (1) { \
closure_wait(waitlist, &cl); \
if (_cond) { \
_t = max_t(long, 1L, _until - jiffies); \
break; \
} \
_t = max_t(long, 0L, _until - jiffies); \
if (!_t) \
break; \
closure_sync_timeout(&cl, _t); \
} \
closure_wake_up(waitlist); \
closure_sync(&cl); \
_t; \
})
/*
* Returns 0 if timeout expired, remaining time in jiffies (at least 1) if
* condition became true
*/
#define closure_wait_event_timeout(waitlist, _cond, _timeout) \
({ \
unsigned long _until = jiffies + _timeout; \
(_cond) \
? max_t(long, 1L, _until - jiffies) \
: __closure_wait_event_timeout(waitlist, _cond, _until);\
})
#endif /* _LINUX_CLOSURE_H */