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jbd: eliminate duplicated code in revocation table init/destroy functions

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The revocation table initialisation/destruction code is repeated for each
of the two revocation tables stored in the journal.  Refactoring the
duplicated code into functions is tidier, simplifies the logic in
initialisation in particular, and slightly reduces the code size.

There should not be any functional change.

Signed-off-by: Duane Griffin <duaneg@dghda.com>
Cc: <linux-ext4@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Duane Griffin 2008-07-25 01:46:20 -07:00 committed by Linus Torvalds
parent 3850f7a521
commit f4d79ca2fa
1 changed files with 55 additions and 80 deletions
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135
fs/jbd/revoke.c
View file

@ -195,109 +195,84 @@ void journal_destroy_revoke_caches(void)
revoke_table_cache = NULL;
}
/* Initialise the revoke table for a given journal to a given size. */
int journal_init_revoke(journal_t *journal, int hash_size)
static struct jbd_revoke_table_s *journal_init_revoke_table(int hash_size)
{
int shift, tmp;
int shift = 0;
int tmp = hash_size;
struct jbd_revoke_table_s *table;
J_ASSERT (journal->j_revoke_table[0] == NULL);
table = kmem_cache_alloc(revoke_table_cache, GFP_KERNEL);
if (!table)
goto out;
shift = 0;
tmp = hash_size;
while((tmp >>= 1UL) != 0UL)
shift++;
journal->j_revoke_table[0] = kmem_cache_alloc(revoke_table_cache, GFP_KERNEL);
if (!journal->j_revoke_table[0])
return -ENOMEM;
journal->j_revoke = journal->j_revoke_table[0];
/* Check that the hash_size is a power of two */
J_ASSERT(is_power_of_2(hash_size));
journal->j_revoke->hash_size = hash_size;
journal->j_revoke->hash_shift = shift;
journal->j_revoke->hash_table =
table->hash_size = hash_size;
table->hash_shift = shift;
table->hash_table =
kmalloc(hash_size * sizeof(struct list_head), GFP_KERNEL);
if (!journal->j_revoke->hash_table) {
kmem_cache_free(revoke_table_cache, journal->j_revoke_table[0]);
journal->j_revoke = NULL;
return -ENOMEM;
if (!table->hash_table) {
kmem_cache_free(revoke_table_cache, table);
table = NULL;
goto out;
}
for (tmp = 0; tmp < hash_size; tmp++)
INIT_LIST_HEAD(&journal->j_revoke->hash_table[tmp]);
INIT_LIST_HEAD(&table->hash_table[tmp]);
journal->j_revoke_table[1] = kmem_cache_alloc(revoke_table_cache, GFP_KERNEL);
if (!journal->j_revoke_table[1]) {
kfree(journal->j_revoke_table[0]->hash_table);
kmem_cache_free(revoke_table_cache, journal->j_revoke_table[0]);
return -ENOMEM;
out:
return table;
}
static void journal_destroy_revoke_table(struct jbd_revoke_table_s *table)
{
int i;
struct list_head *hash_list;
for (i = 0; i < table->hash_size; i++) {
hash_list = &table->hash_table[i];
J_ASSERT(list_empty(hash_list));
}
kfree(table->hash_table);
kmem_cache_free(revoke_table_cache, table);
}
/* Initialise the revoke table for a given journal to a given size. */
int journal_init_revoke(journal_t *journal, int hash_size)
{
J_ASSERT(journal->j_revoke_table[0] == NULL);
J_ASSERT(is_power_of_2(hash_size));
journal->j_revoke_table[0] = journal_init_revoke_table(hash_size);
if (!journal->j_revoke_table[0])
goto fail0;
journal->j_revoke_table[1] = journal_init_revoke_table(hash_size);
if (!journal->j_revoke_table[1])
goto fail1;
journal->j_revoke = journal->j_revoke_table[1];
/* Check that the hash_size is a power of two */
J_ASSERT(is_power_of_2(hash_size));
journal->j_revoke->hash_size = hash_size;
journal->j_revoke->hash_shift = shift;
journal->j_revoke->hash_table =
kmalloc(hash_size * sizeof(struct list_head), GFP_KERNEL);
if (!journal->j_revoke->hash_table) {
kfree(journal->j_revoke_table[0]->hash_table);
kmem_cache_free(revoke_table_cache, journal->j_revoke_table[0]);
kmem_cache_free(revoke_table_cache, journal->j_revoke_table[1]);
journal->j_revoke = NULL;
return -ENOMEM;
}
for (tmp = 0; tmp < hash_size; tmp++)
INIT_LIST_HEAD(&journal->j_revoke->hash_table[tmp]);
spin_lock_init(&journal->j_revoke_lock);
return 0;
fail1:
journal_destroy_revoke_table(journal->j_revoke_table[0]);
fail0:
return -ENOMEM;
}
/* Destoy a journal's revoke table. The table must already be empty! */
/* Destroy a journal's revoke table. The table must already be empty! */
void journal_destroy_revoke(journal_t *journal)
{
struct jbd_revoke_table_s *table;
struct list_head *hash_list;
int i;
table = journal->j_revoke_table[0];
if (!table)
return;
for (i=0; i<table->hash_size; i++) {
hash_list = &table->hash_table[i];
J_ASSERT (list_empty(hash_list));
}
kfree(table->hash_table);
kmem_cache_free(revoke_table_cache, table);
journal->j_revoke = NULL;
table = journal->j_revoke_table[1];
if (!table)
return;
for (i=0; i<table->hash_size; i++) {
hash_list = &table->hash_table[i];
J_ASSERT (list_empty(hash_list));
}
kfree(table->hash_table);
kmem_cache_free(revoke_table_cache, table);
journal->j_revoke = NULL;
if (journal->j_revoke_table[0])
journal_destroy_revoke_table(journal->j_revoke_table[0]);
if (journal->j_revoke_table[1])
journal_destroy_revoke_table(journal->j_revoke_table[1]);
}