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Optimize check_filesystem() and process_error_log()

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Integrate check_clones() into check_filesystem() and implement a list
instead of iterating recursively over the clones, thus eliminating the
risk of a stack overflow.

Also use kmem_zalloc() to allocate large structures in
process_error_log() reducing its stack size from ~700 to ~128 bytes.

Reviewed-by: Tino Reichardt <milky-zfs@mcmilk.de>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: George Amanakis <gamanakis@gmail.com>
Closes #14744
This commit is contained in:
George Amanakis 2023-05-03 18:00:14 +02:00 committed by GitHub
parent d96e29576c
commit 9de5300c7f
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GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 84 additions and 54 deletions
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138
module/zfs/spa_errlog.c
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@ -72,6 +72,11 @@
#define NAME_MAX_LEN 64
typedef struct clones {
uint64_t clone_ds;
list_node_t node;
} clones_t;
/*
* spa_upgrade_errlog_limit : A zfs module parameter that controls the number
* of on-disk error log entries that will be converted to the new
@ -135,10 +140,6 @@ name_to_bookmark(char *buf, zbookmark_phys_t *zb)
}
#ifdef _KERNEL
static int check_clones(spa_t *spa, uint64_t zap_clone, uint64_t snap_count,
uint64_t *snap_obj_array, zbookmark_err_phys_t *zep, void* uaddr,
uint64_t *count);
static void
zep_to_zb(uint64_t dataset, zbookmark_err_phys_t *zep, zbookmark_phys_t *zb)
{
@ -291,7 +292,7 @@ copyout_entry(const zbookmark_phys_t *zb, void *uaddr, uint64_t *count)
*/
static int
check_filesystem(spa_t *spa, uint64_t head_ds, zbookmark_err_phys_t *zep,
void *uaddr, uint64_t *count)
void *uaddr, uint64_t *count, list_t *clones_list)
{
dsl_dataset_t *ds;
dsl_pool_t *dp = spa->spa_dsl_pool;
@ -412,24 +413,10 @@ check_filesystem(spa_t *spa, uint64_t head_ds, zbookmark_err_phys_t *zep,
dsl_dataset_rele(ds, FTAG);
}
if (zap_clone != 0 && aff_snap_count > 0) {
error = check_clones(spa, zap_clone, snap_count, snap_obj_array,
zep, uaddr, count);
}
if (zap_clone == 0 || aff_snap_count == 0)
return (0);
out:
kmem_free(snap_obj_array, sizeof (*snap_obj_array));
return (error);
}
/*
* Clone checking.
*/
static int check_clones(spa_t *spa, uint64_t zap_clone, uint64_t snap_count,
uint64_t *snap_obj_array, zbookmark_err_phys_t *zep, void* uaddr,
uint64_t *count)
{
int error = 0;
/* Check clones. */
zap_cursor_t *zc;
zap_attribute_t *za;
@ -440,7 +427,6 @@ static int check_clones(spa_t *spa, uint64_t zap_clone, uint64_t snap_count,
zap_cursor_retrieve(zc, za) == 0;
zap_cursor_advance(zc)) {
dsl_pool_t *dp = spa->spa_dsl_pool;
dsl_dataset_t *clone;
error = dsl_dataset_hold_obj(dp, za->za_first_integer,
FTAG, &clone);
@ -463,17 +449,17 @@ static int check_clones(spa_t *spa, uint64_t zap_clone, uint64_t snap_count,
if (!found)
continue;
error = check_filesystem(spa, za->za_first_integer, zep,
uaddr, count);
if (error != 0)
break;
clones_t *ct = kmem_zalloc(sizeof (*ct), KM_SLEEP);
ct->clone_ds = za->za_first_integer;
list_insert_tail(clones_list, ct);
}
zap_cursor_fini(zc);
kmem_free(za, sizeof (*za));
kmem_free(zc, sizeof (*zc));
out:
kmem_free(snap_obj_array, sizeof (*snap_obj_array));
return (error);
}
@ -523,8 +509,30 @@ process_error_block(spa_t *spa, uint64_t head_ds, zbookmark_err_phys_t *zep,
uint64_t top_affected_fs;
int error = find_top_affected_fs(spa, head_ds, zep, &top_affected_fs);
if (error == 0) {
clones_t *ct;
list_t clones_list;
list_create(&clones_list, sizeof (clones_t),
offsetof(clones_t, node));
error = check_filesystem(spa, top_affected_fs, zep,
uaddr, count);
uaddr, count, &clones_list);
while ((ct = list_remove_head(&clones_list)) != NULL) {
error = check_filesystem(spa, ct->clone_ds, zep,
uaddr, count, &clones_list);
kmem_free(ct, sizeof (*ct));
if (error) {
while (!list_is_empty(&clones_list)) {
ct = list_remove_head(&clones_list);
kmem_free(ct, sizeof (*ct));
}
break;
}
}
list_destroy(&clones_list);
}
return (error);
@ -827,62 +835,84 @@ spa_upgrade_errlog(spa_t *spa, dmu_tx_t *tx)
static int
process_error_log(spa_t *spa, uint64_t obj, void *uaddr, uint64_t *count)
{
zap_cursor_t zc;
zap_attribute_t za;
if (obj == 0)
return (0);
zap_cursor_t *zc;
zap_attribute_t *za;
zc = kmem_zalloc(sizeof (zap_cursor_t), KM_SLEEP);
za = kmem_zalloc(sizeof (zap_attribute_t), KM_SLEEP);
if (!spa_feature_is_enabled(spa, SPA_FEATURE_HEAD_ERRLOG)) {
for (zap_cursor_init(&zc, spa->spa_meta_objset, obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
for (zap_cursor_init(zc, spa->spa_meta_objset, obj);
zap_cursor_retrieve(zc, za) == 0;
zap_cursor_advance(zc)) {
if (*count == 0) {
zap_cursor_fini(&zc);
zap_cursor_fini(zc);
kmem_free(zc, sizeof (*zc));
kmem_free(za, sizeof (*za));
return (SET_ERROR(ENOMEM));
}
zbookmark_phys_t zb;
name_to_bookmark(za.za_name, &zb);
name_to_bookmark(za->za_name, &zb);
int error = copyout_entry(&zb, uaddr, count);
if (error != 0) {
zap_cursor_fini(&zc);
zap_cursor_fini(zc);
kmem_free(zc, sizeof (*zc));
kmem_free(za, sizeof (*za));
return (error);
}
}
zap_cursor_fini(&zc);
zap_cursor_fini(zc);
kmem_free(zc, sizeof (*zc));
kmem_free(za, sizeof (*za));
return (0);
}
for (zap_cursor_init(&zc, spa->spa_meta_objset, obj);
zap_cursor_retrieve(&zc, &za) == 0;
zap_cursor_advance(&zc)) {
for (zap_cursor_init(zc, spa->spa_meta_objset, obj);
zap_cursor_retrieve(zc, za) == 0;
zap_cursor_advance(zc)) {
zap_cursor_t head_ds_cursor;
zap_attribute_t head_ds_attr;
zap_cursor_t *head_ds_cursor;
zap_attribute_t *head_ds_attr;
uint64_t head_ds_err_obj = za.za_first_integer;
head_ds_cursor = kmem_zalloc(sizeof (zap_cursor_t), KM_SLEEP);
head_ds_attr = kmem_zalloc(sizeof (zap_attribute_t), KM_SLEEP);
uint64_t head_ds_err_obj = za->za_first_integer;
uint64_t head_ds;
name_to_object(za.za_name, &head_ds);
for (zap_cursor_init(&head_ds_cursor, spa->spa_meta_objset,
head_ds_err_obj); zap_cursor_retrieve(&head_ds_cursor,
&head_ds_attr) == 0; zap_cursor_advance(&head_ds_cursor)) {
name_to_object(za->za_name, &head_ds);
for (zap_cursor_init(head_ds_cursor, spa->spa_meta_objset,
head_ds_err_obj); zap_cursor_retrieve(head_ds_cursor,
head_ds_attr) == 0; zap_cursor_advance(head_ds_cursor)) {
zbookmark_err_phys_t head_ds_block;
name_to_errphys(head_ds_attr.za_name, &head_ds_block);
name_to_errphys(head_ds_attr->za_name, &head_ds_block);
int error = process_error_block(spa, head_ds,
&head_ds_block, uaddr, count);
if (error != 0) {
zap_cursor_fini(&head_ds_cursor);
zap_cursor_fini(&zc);
zap_cursor_fini(head_ds_cursor);
kmem_free(head_ds_cursor,
sizeof (*head_ds_cursor));
kmem_free(head_ds_attr, sizeof (*head_ds_attr));
zap_cursor_fini(zc);
kmem_free(za, sizeof (*za));
kmem_free(zc, sizeof (*zc));
return (error);
}
}
zap_cursor_fini(&head_ds_cursor);
zap_cursor_fini(head_ds_cursor);
kmem_free(head_ds_cursor, sizeof (*head_ds_cursor));
kmem_free(head_ds_attr, sizeof (*head_ds_attr));
}
zap_cursor_fini(&zc);
zap_cursor_fini(zc);
kmem_free(za, sizeof (*za));
kmem_free(zc, sizeof (*zc));
return (0);
}