microsoft
/
WSL2-Linux-Kernel
зеркало из https://github.com/microsoft/WSL2-Linux-Kernel.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность

Bug and regression fixes for 6.5-rc3 for ext4's mballoc and jbd2's 

checkpoint code.
 -----BEGIN PGP SIGNATURE-----
 
 iQEzBAABCAAdFiEEK2m5VNv+CHkogTfJ8vlZVpUNgaMFAmS9HHIACgkQ8vlZVpUN
 gaNg/wf8DAf9PMn2bmQ309Acs5E8Qi1bga/ofNnoBcDNC7k+iKGAGgwOnCn+ity4
 32KiA5Yh7tzoYvZHUTE5k297mN+4AX4DyAREh1cVITohRxm3BpXYZzezdLSieS8b
 7RAdOinaWzs0dBjwNqkKVrTL3jduD704DnefrtHFvwqzBf/QSVSaACoPACqCFyxx
 TFvutv2h5ifjS7fsjKXrXjHUAYMJCYzJNOcTW1OUb8rknUhCaKyoCkFht4PawuVx
 h1wTkP87RW/bTgHA7Kqrq4BY2nLg8U0B3U/4qmW7wMjUYyAPLTUXKD3Ewj7XaFMA
 UYRBr7xba8GWqyOURb3TvzrwRjqTJg==
 =inak
 -----END PGP SIGNATURE-----

Merge tag 'ext4_for_linus-6.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4

Pull ext4 fixes from Ted Ts'o:
 "Bug and regression fixes for 6.5-rc3 for ext4's mballoc and jbd2's
  checkpoint code"

* tag 'ext4_for_linus-6.5-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix rbtree traversal bug in ext4_mb_use_preallocated
  ext4: fix off by one issue in ext4_mb_choose_next_group_best_avail()
  ext4: correct inline offset when handling xattrs in inode body
  jbd2: remove __journal_try_to_free_buffer()
  jbd2: fix a race when checking checkpoint buffer busy
  jbd2: Fix wrongly judgement for buffer head removing while doing checkpoint
  jbd2: remove journal_clean_one_cp_list()
  jbd2: remove t_checkpoint_io_list
  jbd2: recheck chechpointing non-dirty buffer
This commit is contained in:
Linus Torvalds 2023-07-23 10:21:49 -07:00
Родитель 8266f53b39 9d3de7ee19
Коммит 15b593ba68
7 изменённых файлов: 271 добавлений и 272 удалений
Показать статистику Скачать Patch файл Скачать Diff файл Показать все файлы Свернуть все файлы

178
fs/ext4/mballoc.c
Просмотреть файл

@ -1006,14 +1006,11 @@ static void ext4_mb_choose_next_group_best_avail(struct ext4_allocation_context
* fls() instead since we need to know the actual length while modifying
* goal length.
*/
order = fls(ac->ac_g_ex.fe_len);
order = fls(ac->ac_g_ex.fe_len) - 1;
min_order = order - sbi->s_mb_best_avail_max_trim_order;
if (min_order < 0)
min_order = 0;
if (1 << min_order < ac->ac_o_ex.fe_len)
min_order = fls(ac->ac_o_ex.fe_len) + 1;
if (sbi->s_stripe > 0) {
/*
* We are assuming that stripe size is always a multiple of
@ -1021,9 +1018,16 @@ static void ext4_mb_choose_next_group_best_avail(struct ext4_allocation_context
*/
num_stripe_clusters = EXT4_NUM_B2C(sbi, sbi->s_stripe);
if (1 << min_order < num_stripe_clusters)
min_order = fls(num_stripe_clusters);
/*
* We consider 1 order less because later we round
* up the goal len to num_stripe_clusters
*/
min_order = fls(num_stripe_clusters) - 1;
}
if (1 << min_order < ac->ac_o_ex.fe_len)
min_order = fls(ac->ac_o_ex.fe_len);
for (i = order; i >= min_order; i--) {
int frag_order;
/*
@ -4761,8 +4765,8 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
int order, i;
struct ext4_inode_info *ei = EXT4_I(ac->ac_inode);
struct ext4_locality_group *lg;
struct ext4_prealloc_space *tmp_pa, *cpa = NULL;
ext4_lblk_t tmp_pa_start, tmp_pa_end;
struct ext4_prealloc_space *tmp_pa = NULL, *cpa = NULL;
loff_t tmp_pa_end;
struct rb_node *iter;
ext4_fsblk_t goal_block;
@ -4770,47 +4774,151 @@ ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
if (!(ac->ac_flags & EXT4_MB_HINT_DATA))
return false;
/* first, try per-file preallocation */
/*
* first, try per-file preallocation by searching the inode pa rbtree.
*
* Here, we can't do a direct traversal of the tree because
* ext4_mb_discard_group_preallocation() can paralelly mark the pa
* deleted and that can cause direct traversal to skip some entries.
*/
read_lock(&ei->i_prealloc_lock);
if (RB_EMPTY_ROOT(&ei->i_prealloc_node)) {
goto try_group_pa;
}
/*
* Step 1: Find a pa with logical start immediately adjacent to the
* original logical start. This could be on the left or right.
*
* (tmp_pa->pa_lstart never changes so we can skip locking for it).
*/
for (iter = ei->i_prealloc_node.rb_node; iter;
iter = ext4_mb_pa_rb_next_iter(ac->ac_o_ex.fe_logical,
tmp_pa_start, iter)) {
tmp_pa->pa_lstart, iter)) {
tmp_pa = rb_entry(iter, struct ext4_prealloc_space,
pa_node.inode_node);
}
/* all fields in this condition don't change,
* so we can skip locking for them */
tmp_pa_start = tmp_pa->pa_lstart;
tmp_pa_end = tmp_pa->pa_lstart + EXT4_C2B(sbi, tmp_pa->pa_len);
/*
* Step 2: The adjacent pa might be to the right of logical start, find
* the left adjacent pa. After this step we'd have a valid tmp_pa whose
* logical start is towards the left of original request's logical start
*/
if (tmp_pa->pa_lstart > ac->ac_o_ex.fe_logical) {
struct rb_node *tmp;
tmp = rb_prev(&tmp_pa->pa_node.inode_node);
/* original request start doesn't lie in this PA */
if (ac->ac_o_ex.fe_logical < tmp_pa_start ||
ac->ac_o_ex.fe_logical >= tmp_pa_end)
continue;
/* non-extent files can't have physical blocks past 2^32 */
if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS)) &&
(tmp_pa->pa_pstart + EXT4_C2B(sbi, tmp_pa->pa_len) >
EXT4_MAX_BLOCK_FILE_PHYS)) {
if (tmp) {
tmp_pa = rb_entry(tmp, struct ext4_prealloc_space,
pa_node.inode_node);
} else {
/*
* Since PAs don't overlap, we won't find any
* other PA to satisfy this.
* If there is no adjacent pa to the left then finding
* an overlapping pa is not possible hence stop searching
* inode pa tree
*/
goto try_group_pa;
}
}
BUG_ON(!(tmp_pa && tmp_pa->pa_lstart <= ac->ac_o_ex.fe_logical));
/*
* Step 3: If the left adjacent pa is deleted, keep moving left to find
* the first non deleted adjacent pa. After this step we should have a
* valid tmp_pa which is guaranteed to be non deleted.
*/
for (iter = &tmp_pa->pa_node.inode_node;; iter = rb_prev(iter)) {
if (!iter) {
/*
* no non deleted left adjacent pa, so stop searching
* inode pa tree
*/
goto try_group_pa;
}
tmp_pa = rb_entry(iter, struct ext4_prealloc_space,
pa_node.inode_node);
spin_lock(&tmp_pa->pa_lock);
if (tmp_pa->pa_deleted == 0) {
/*
* We will keep holding the pa_lock from
* this point on because we don't want group discard
* to delete this pa underneath us. Since group
* discard is anyways an ENOSPC operation it
* should be okay for it to wait a few more cycles.
*/
break;
}
/* found preallocated blocks, use them */
spin_lock(&tmp_pa->pa_lock);
if (tmp_pa->pa_deleted == 0 && tmp_pa->pa_free &&
likely(ext4_mb_pa_goal_check(ac, tmp_pa))) {
atomic_inc(&tmp_pa->pa_count);
ext4_mb_use_inode_pa(ac, tmp_pa);
} else {
spin_unlock(&tmp_pa->pa_lock);
read_unlock(&ei->i_prealloc_lock);
return true;
}
spin_unlock(&tmp_pa->pa_lock);
}
BUG_ON(!(tmp_pa && tmp_pa->pa_lstart <= ac->ac_o_ex.fe_logical));
BUG_ON(tmp_pa->pa_deleted == 1);
/*
* Step 4: We now have the non deleted left adjacent pa. Only this
* pa can possibly satisfy the request hence check if it overlaps
* original logical start and stop searching if it doesn't.
*/
tmp_pa_end = (loff_t)tmp_pa->pa_lstart + EXT4_C2B(sbi, tmp_pa->pa_len);
if (ac->ac_o_ex.fe_logical >= tmp_pa_end) {
spin_unlock(&tmp_pa->pa_lock);
goto try_group_pa;
}
/* non-extent files can't have physical blocks past 2^32 */
if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS)) &&
(tmp_pa->pa_pstart + EXT4_C2B(sbi, tmp_pa->pa_len) >
EXT4_MAX_BLOCK_FILE_PHYS)) {
/*
* Since PAs don't overlap, we won't find any other PA to
* satisfy this.
*/
spin_unlock(&tmp_pa->pa_lock);
goto try_group_pa;
}
if (tmp_pa->pa_free && likely(ext4_mb_pa_goal_check(ac, tmp_pa))) {
atomic_inc(&tmp_pa->pa_count);
ext4_mb_use_inode_pa(ac, tmp_pa);
spin_unlock(&tmp_pa->pa_lock);
read_unlock(&ei->i_prealloc_lock);
return true;
} else {
/*
* We found a valid overlapping pa but couldn't use it because
* it had no free blocks. This should ideally never happen
* because:
*
* 1. When a new inode pa is added to rbtree it must have
* pa_free > 0 since otherwise we won't actually need
* preallocation.
*
* 2. An inode pa that is in the rbtree can only have it's
* pa_free become zero when another thread calls:
* ext4_mb_new_blocks
* ext4_mb_use_preallocated
* ext4_mb_use_inode_pa
*
* 3. Further, after the above calls make pa_free == 0, we will
* immediately remove it from the rbtree in:
* ext4_mb_new_blocks
* ext4_mb_release_context
* ext4_mb_put_pa
*
* 4. Since the pa_free becoming 0 and pa_free getting removed
* from tree both happen in ext4_mb_new_blocks, which is always
* called with i_data_sem held for data allocations, we can be
* sure that another process will never see a pa in rbtree with
* pa_free == 0.
*/
WARN_ON_ONCE(tmp_pa->pa_free == 0);
}
spin_unlock(&tmp_pa->pa_lock);
try_group_pa:
read_unlock(&ei->i_prealloc_lock);
/* can we use group allocation? */

14
fs/ext4/xattr.c
Просмотреть файл

@ -1782,6 +1782,20 @@ static int ext4_xattr_set_entry(struct ext4_xattr_info *i,
memmove(here, (void *)here + size,
(void *)last - (void *)here + sizeof(__u32));
memset(last, 0, size);
/*
* Update i_inline_off - moved ibody region might contain
* system.data attribute. Handling a failure here won't
* cause other complications for setting an xattr.
*/
if (!is_block && ext4_has_inline_data(inode)) {
ret = ext4_find_inline_data_nolock(inode);
if (ret) {
ext4_warning_inode(inode,
"unable to update i_inline_off");
goto out;
}
}
} else if (s->not_found) {
/* Insert new name. */
size_t size = EXT4_XATTR_LEN(name_len);

289
fs/jbd2/checkpoint.c
Просмотреть файл

@ -27,7 +27,7 @@
*
* Called with j_list_lock held.
*/
static inline void __buffer_unlink_first(struct journal_head *jh)
static inline void __buffer_unlink(struct journal_head *jh)
{
transaction_t *transaction = jh->b_cp_transaction;
@ -40,45 +40,6 @@ static inline void __buffer_unlink_first(struct journal_head *jh)
}
}
/*
* Unlink a buffer from a transaction checkpoint(io) list.
*
* Called with j_list_lock held.
*/
static inline void __buffer_unlink(struct journal_head *jh)
{
transaction_t *transaction = jh->b_cp_transaction;
__buffer_unlink_first(jh);
if (transaction->t_checkpoint_io_list == jh) {
transaction->t_checkpoint_io_list = jh->b_cpnext;
if (transaction->t_checkpoint_io_list == jh)
transaction->t_checkpoint_io_list = NULL;
}
}
/*
* Move a buffer from the checkpoint list to the checkpoint io list
*
* Called with j_list_lock held
*/
static inline void __buffer_relink_io(struct journal_head *jh)
{
transaction_t *transaction = jh->b_cp_transaction;
__buffer_unlink_first(jh);
if (!transaction->t_checkpoint_io_list) {
jh->b_cpnext = jh->b_cpprev = jh;
} else {
jh->b_cpnext = transaction->t_checkpoint_io_list;
jh->b_cpprev = transaction->t_checkpoint_io_list->b_cpprev;
jh->b_cpprev->b_cpnext = jh;
jh->b_cpnext->b_cpprev = jh;
}
transaction->t_checkpoint_io_list = jh;
}
/*
* Check a checkpoint buffer could be release or not.
*
@ -183,6 +144,7 @@ __flush_batch(journal_t *journal, int *batch_count)
struct buffer_head *bh = journal->j_chkpt_bhs[i];
BUFFER_TRACE(bh, "brelse");
__brelse(bh);
journal->j_chkpt_bhs[i] = NULL;
}
*batch_count = 0;
}
@ -242,15 +204,6 @@ restart:
jh = transaction->t_checkpoint_list;
bh = jh2bh(jh);
if (buffer_locked(bh)) {
get_bh(bh);
spin_unlock(&journal->j_list_lock);
wait_on_buffer(bh);
/* the journal_head may have gone by now */
BUFFER_TRACE(bh, "brelse");
__brelse(bh);
goto retry;
}
if (jh->b_transaction != NULL) {
transaction_t *t = jh->b_transaction;
tid_t tid = t->t_tid;
@ -285,30 +238,50 @@ restart:
spin_lock(&journal->j_list_lock);
goto restart;
}
if (!buffer_dirty(bh)) {
if (!trylock_buffer(bh)) {
/*
* The buffer is locked, it may be writing back, or
* flushing out in the last couple of cycles, or
* re-adding into a new transaction, need to check
* it again until it's unlocked.
*/
get_bh(bh);
spin_unlock(&journal->j_list_lock);
wait_on_buffer(bh);
/* the journal_head may have gone by now */
BUFFER_TRACE(bh, "brelse");
__brelse(bh);
goto retry;
} else if (!buffer_dirty(bh)) {
unlock_buffer(bh);
BUFFER_TRACE(bh, "remove from checkpoint");
if (__jbd2_journal_remove_checkpoint(jh))
/* The transaction was released; we're done */
/*
* If the transaction was released or the checkpoint
* list was empty, we're done.
*/
if (__jbd2_journal_remove_checkpoint(jh) ||
!transaction->t_checkpoint_list)
goto out;
continue;
} else {
unlock_buffer(bh);
/*
* We are about to write the buffer, it could be
* raced by some other transaction shrink or buffer
* re-log logic once we release the j_list_lock,
* leave it on the checkpoint list and check status
* again to make sure it's clean.
*/
BUFFER_TRACE(bh, "queue");
get_bh(bh);
J_ASSERT_BH(bh, !buffer_jwrite(bh));
journal->j_chkpt_bhs[batch_count++] = bh;
transaction->t_chp_stats.cs_written++;
transaction->t_checkpoint_list = jh->b_cpnext;
}
/*
* Important: we are about to write the buffer, and
* possibly block, while still holding the journal
* lock. We cannot afford to let the transaction
* logic start messing around with this buffer before
* we write it to disk, as that would break
* recoverability.
*/
BUFFER_TRACE(bh, "queue");
get_bh(bh);
J_ASSERT_BH(bh, !buffer_jwrite(bh));
journal->j_chkpt_bhs[batch_count++] = bh;
__buffer_relink_io(jh);
transaction->t_chp_stats.cs_written++;
if ((batch_count == JBD2_NR_BATCH) ||
need_resched() ||
spin_needbreak(&journal->j_list_lock))
need_resched() || spin_needbreak(&journal->j_list_lock) ||
jh2bh(transaction->t_checkpoint_list) == journal->j_chkpt_bhs[0])
goto unlock_and_flush;
}
@ -322,38 +295,6 @@ restart:
goto restart;
}
/*
* Now we issued all of the transaction's buffers, let's deal
* with the buffers that are out for I/O.
*/
restart2:
/* Did somebody clean up the transaction in the meanwhile? */
if (journal->j_checkpoint_transactions != transaction ||
transaction->t_tid != this_tid)
goto out;
while (transaction->t_checkpoint_io_list) {
jh = transaction->t_checkpoint_io_list;
bh = jh2bh(jh);
if (buffer_locked(bh)) {
get_bh(bh);
spin_unlock(&journal->j_list_lock);
wait_on_buffer(bh);
/* the journal_head may have gone by now */
BUFFER_TRACE(bh, "brelse");
__brelse(bh);
spin_lock(&journal->j_list_lock);
goto restart2;
}
/*
* Now in whatever state the buffer currently is, we
* know that it has been written out and so we can
* drop it from the list
*/
if (__jbd2_journal_remove_checkpoint(jh))
break;
}
out:
spin_unlock(&journal->j_list_lock);
result = jbd2_cleanup_journal_tail(journal);
@ -409,19 +350,24 @@ int jbd2_cleanup_journal_tail(journal_t *journal)
/* Checkpoint list management */
/*
* journal_clean_one_cp_list
* journal_shrink_one_cp_list
*
* Find all the written-back checkpoint buffers in the given list and
* release them. If 'destroy' is set, clean all buffers unconditionally.
* Find all the written-back checkpoint buffers in the given list
* and try to release them. If the whole transaction is released, set
* the 'released' parameter. Return the number of released checkpointed
* buffers.
*
* Called with j_list_lock held.
* Returns 1 if we freed the transaction, 0 otherwise.
*/
static int journal_clean_one_cp_list(struct journal_head *jh, bool destroy)
static unsigned long journal_shrink_one_cp_list(struct journal_head *jh,
bool destroy, bool *released)
{
struct journal_head *last_jh;
struct journal_head *next_jh = jh;
unsigned long nr_freed = 0;
int ret;
*released = false;
if (!jh)
return 0;
@ -430,57 +376,15 @@ static int journal_clean_one_cp_list(struct journal_head *jh, bool destroy)
jh = next_jh;
next_jh = jh->b_cpnext;
if (!destroy && __cp_buffer_busy(jh))
return 0;
if (__jbd2_journal_remove_checkpoint(jh))
return 1;
/*
* This function only frees up some memory
* if possible so we dont have an obligation
* to finish processing. Bail out if preemption
* requested:
*/
if (need_resched())
return 0;
} while (jh != last_jh);
return 0;
}
/*
* journal_shrink_one_cp_list
*
* Find 'nr_to_scan' written-back checkpoint buffers in the given list
* and try to release them. If the whole transaction is released, set
* the 'released' parameter. Return the number of released checkpointed
* buffers.
*
* Called with j_list_lock held.
*/
static unsigned long journal_shrink_one_cp_list(struct journal_head *jh,
unsigned long *nr_to_scan,
bool *released)
{
struct journal_head *last_jh;
struct journal_head *next_jh = jh;
unsigned long nr_freed = 0;
int ret;
if (!jh || *nr_to_scan == 0)
return 0;
last_jh = jh->b_cpprev;
do {
jh = next_jh;
next_jh = jh->b_cpnext;
(*nr_to_scan)--;
if (__cp_buffer_busy(jh))
continue;
if (destroy) {
ret = __jbd2_journal_remove_checkpoint(jh);
} else {
ret = jbd2_journal_try_remove_checkpoint(jh);
if (ret < 0)
continue;
}
nr_freed++;
ret = __jbd2_journal_remove_checkpoint(jh);
if (ret) {
*released = true;
break;
@ -488,7 +392,7 @@ static unsigned long journal_shrink_one_cp_list(struct journal_head *jh,
if (need_resched())
break;
} while (jh != last_jh && *nr_to_scan);
} while (jh != last_jh);
return nr_freed;
}
@ -506,11 +410,11 @@ unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal,
unsigned long *nr_to_scan)
{
transaction_t *transaction, *last_transaction, *next_transaction;
bool released;
bool __maybe_unused released;
tid_t first_tid = 0, last_tid = 0, next_tid = 0;
tid_t tid = 0;
unsigned long nr_freed = 0;
unsigned long nr_scanned = *nr_to_scan;
unsigned long freed;
again:
spin_lock(&journal->j_list_lock);
@ -539,19 +443,11 @@ again:
transaction = next_transaction;
next_transaction = transaction->t_cpnext;
tid = transaction->t_tid;
released = false;
nr_freed += journal_shrink_one_cp_list(transaction->t_checkpoint_list,
nr_to_scan, &released);
if (*nr_to_scan == 0)
break;
if (need_resched() || spin_needbreak(&journal->j_list_lock))
break;
if (released)
continue;
nr_freed += journal_shrink_one_cp_list(transaction->t_checkpoint_io_list,
nr_to_scan, &released);
freed = journal_shrink_one_cp_list(transaction->t_checkpoint_list,
false, &released);
nr_freed += freed;
(*nr_to_scan) -= min(*nr_to_scan, freed);
if (*nr_to_scan == 0)
break;
if (need_resched() || spin_needbreak(&journal->j_list_lock))
@ -572,9 +468,8 @@ again:
if (*nr_to_scan && next_tid)
goto again;
out:
nr_scanned -= *nr_to_scan;
trace_jbd2_shrink_checkpoint_list(journal, first_tid, tid, last_tid,
nr_freed, nr_scanned, next_tid);
nr_freed, next_tid);
return nr_freed;
}
@ -590,7 +485,7 @@ out:
void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy)
{
transaction_t *transaction, *last_transaction, *next_transaction;
int ret;
bool released;
transaction = journal->j_checkpoint_transactions;
if (!transaction)
@ -601,8 +496,8 @@ void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy)
do {
transaction = next_transaction;
next_transaction = transaction->t_cpnext;
ret = journal_clean_one_cp_list(transaction->t_checkpoint_list,
destroy);
journal_shrink_one_cp_list(transaction->t_checkpoint_list,
destroy, &released);
/*
* This function only frees up some memory if possible so we
* dont have an obligation to finish processing. Bail out if
@ -610,23 +505,12 @@ void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy)
*/
if (need_resched())
return;
if (ret)
continue;
/*
* It is essential that we are as careful as in the case of
* t_checkpoint_list with removing the buffer from the list as
* we can possibly see not yet submitted buffers on io_list
*/
ret = journal_clean_one_cp_list(transaction->
t_checkpoint_io_list, destroy);
if (need_resched())
return;
/*
* Stop scanning if we couldn't free the transaction. This
* avoids pointless scanning of transactions which still
* weren't checkpointed.
*/
if (!ret)
if (!released)
return;
} while (transaction != last_transaction);
}
@ -705,7 +589,7 @@ int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
jbd2_journal_put_journal_head(jh);
/* Is this transaction empty? */
if (transaction->t_checkpoint_list || transaction->t_checkpoint_io_list)
if (transaction->t_checkpoint_list)
return 0;
/*
@ -736,6 +620,34 @@ int __jbd2_journal_remove_checkpoint(struct journal_head *jh)
return 1;
}
/*
* Check the checkpoint buffer and try to remove it from the checkpoint
* list if it's clean. Returns -EBUSY if it is not clean, returns 1 if
* it frees the transaction, 0 otherwise.
*
* This function is called with j_list_lock held.
*/
int jbd2_journal_try_remove_checkpoint(struct journal_head *jh)
{
struct buffer_head *bh = jh2bh(jh);
if (!trylock_buffer(bh))
return -EBUSY;
if (buffer_dirty(bh)) {
unlock_buffer(bh);
return -EBUSY;
}
unlock_buffer(bh);
/*
* Buffer is clean and the IO has finished (we held the buffer
* lock) so the checkpoint is done. We can safely remove the
* buffer from this transaction.
*/
JBUFFER_TRACE(jh, "remove from checkpoint list");
return __jbd2_journal_remove_checkpoint(jh);
}
/*
* journal_insert_checkpoint: put a committed buffer onto a checkpoint
* list so that we know when it is safe to clean the transaction out of
@ -797,7 +709,6 @@ void __jbd2_journal_drop_transaction(journal_t *journal, transaction_t *transact
J_ASSERT(transaction->t_forget == NULL);
J_ASSERT(transaction->t_shadow_list == NULL);
J_ASSERT(transaction->t_checkpoint_list == NULL);
J_ASSERT(transaction->t_checkpoint_io_list == NULL);
J_ASSERT(atomic_read(&transaction->t_updates) == 0);
J_ASSERT(journal->j_committing_transaction != transaction);
J_ASSERT(journal->j_running_transaction != transaction);

3
fs/jbd2/commit.c
Просмотреть файл

@ -1141,8 +1141,7 @@ restart_loop:
spin_lock(&journal->j_list_lock);
commit_transaction->t_state = T_FINISHED;
/* Check if the transaction can be dropped now that we are finished */
if (commit_transaction->t_checkpoint_list == NULL &&
commit_transaction->t_checkpoint_io_list == NULL) {
if (commit_transaction->t_checkpoint_list == NULL) {
__jbd2_journal_drop_transaction(journal, commit_transaction);
jbd2_journal_free_transaction(commit_transaction);
}

40
fs/jbd2/transaction.c
Просмотреть файл

@ -1784,8 +1784,7 @@ int jbd2_journal_forget(handle_t *handle, struct buffer_head *bh)
* Otherwise, if the buffer has been written to disk,
* it is safe to remove the checkpoint and drop it.
*/
if (!buffer_dirty(bh)) {
__jbd2_journal_remove_checkpoint(jh);
if (jbd2_journal_try_remove_checkpoint(jh) >= 0) {
spin_unlock(&journal->j_list_lock);
goto drop;
}
@ -2100,35 +2099,6 @@ void jbd2_journal_unfile_buffer(journal_t *journal, struct journal_head *jh)
__brelse(bh);
}
/*
* Called from jbd2_journal_try_to_free_buffers().
*
* Called under jh->b_state_lock
*/
static void
__journal_try_to_free_buffer(journal_t *journal, struct buffer_head *bh)
{
struct journal_head *jh;
jh = bh2jh(bh);
if (buffer_locked(bh) || buffer_dirty(bh))
goto out;
if (jh->b_next_transaction != NULL || jh->b_transaction != NULL)
goto out;
spin_lock(&journal->j_list_lock);
if (jh->b_cp_transaction != NULL) {
/* written-back checkpointed metadata buffer */
JBUFFER_TRACE(jh, "remove from checkpoint list");
__jbd2_journal_remove_checkpoint(jh);
}
spin_unlock(&journal->j_list_lock);
out:
return;
}
/**
* jbd2_journal_try_to_free_buffers() - try to free page buffers.
* @journal: journal for operation
@ -2186,7 +2156,13 @@ bool jbd2_journal_try_to_free_buffers(journal_t *journal, struct folio *folio)
continue;
spin_lock(&jh->b_state_lock);
__journal_try_to_free_buffer(journal, bh);
if (!jh->b_transaction && !jh->b_next_transaction) {
spin_lock(&journal->j_list_lock);
/* Remove written-back checkpointed metadata buffer */
if (jh->b_cp_transaction != NULL)
jbd2_journal_try_remove_checkpoint(jh);
spin_unlock(&journal->j_list_lock);
}
spin_unlock(&jh->b_state_lock);
jbd2_journal_put_journal_head(jh);
if (buffer_jbd(bh))

7
include/linux/jbd2.h
Просмотреть файл

@ -613,12 +613,6 @@ struct transaction_s
*/
struct journal_head *t_checkpoint_list;
/*
* Doubly-linked circular list of all buffers submitted for IO while
* checkpointing. [j_list_lock]
*/
struct journal_head *t_checkpoint_io_list;
/*
* Doubly-linked circular list of metadata buffers being
* shadowed by log IO. The IO buffers on the iobuf list and
@ -1449,6 +1443,7 @@ extern void jbd2_journal_commit_transaction(journal_t *);
void __jbd2_journal_clean_checkpoint_list(journal_t *journal, bool destroy);
unsigned long jbd2_journal_shrink_checkpoint_list(journal_t *journal, unsigned long *nr_to_scan);
int __jbd2_journal_remove_checkpoint(struct journal_head *);
int jbd2_journal_try_remove_checkpoint(struct journal_head *jh);
void jbd2_journal_destroy_checkpoint(journal_t *journal);
void __jbd2_journal_insert_checkpoint(struct journal_head *, transaction_t *);

12
include/trace/events/jbd2.h
Просмотреть файл

@ -462,11 +462,9 @@ TRACE_EVENT(jbd2_shrink_scan_exit,
TRACE_EVENT(jbd2_shrink_checkpoint_list,
TP_PROTO(journal_t *journal, tid_t first_tid, tid_t tid, tid_t last_tid,
unsigned long nr_freed, unsigned long nr_scanned,
tid_t next_tid),
unsigned long nr_freed, tid_t next_tid),
TP_ARGS(journal, first_tid, tid, last_tid, nr_freed,
nr_scanned, next_tid),
TP_ARGS(journal, first_tid, tid, last_tid, nr_freed, next_tid),
TP_STRUCT__entry(
__field(dev_t, dev)
@ -474,7 +472,6 @@ TRACE_EVENT(jbd2_shrink_checkpoint_list,
__field(tid_t, tid)
__field(tid_t, last_tid)
__field(unsigned long, nr_freed)
__field(unsigned long, nr_scanned)
__field(tid_t, next_tid)
),
@ -484,15 +481,14 @@ TRACE_EVENT(jbd2_shrink_checkpoint_list,
__entry->tid = tid;
__entry->last_tid = last_tid;
__entry->nr_freed = nr_freed;
__entry->nr_scanned = nr_scanned;
__entry->next_tid = next_tid;
),
TP_printk("dev %d,%d shrink transaction %u-%u(%u) freed %lu "
"scanned %lu next transaction %u",
"next transaction %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->first_tid, __entry->tid, __entry->last_tid,
__entry->nr_freed, __entry->nr_scanned, __entry->next_tid)
__entry->nr_freed, __entry->next_tid)
);
#endif /* _TRACE_JBD2_H */