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jbd2: eliminate duplicated code in revocation table init/destroy functions 

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>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Duane Griffin 2008-04-17 10:38:59 -04:00 committed by Theodore Ts'o
parent 9fa27c85de
commit 83c49523c9
1 changed files with 55 additions and 80 deletions
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135
fs/jbd2/revoke.c
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@ -204,109 +204,84 @@ record_cache_failure:
return -ENOMEM;
}
/* Initialise the revoke table for a given journal to a given size. */
int jbd2_journal_init_revoke(journal_t *journal, int hash_size)
static struct jbd2_revoke_table_s *jbd2_journal_init_revoke_table(int hash_size)
{
int shift, tmp;
int shift = 0;
int tmp = hash_size;
struct jbd2_revoke_table_s *table;
J_ASSERT (journal->j_revoke_table[0] == NULL);
table = kmem_cache_alloc(jbd2_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(jbd2_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(jbd2_revoke_table_cache, journal->j_revoke_table[0]);
journal->j_revoke = NULL;
return -ENOMEM;
if (!table->hash_table) {
kmem_cache_free(jbd2_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(jbd2_revoke_table_cache, GFP_KERNEL);
if (!journal->j_revoke_table[1]) {
kfree(journal->j_revoke_table[0]->hash_table);
kmem_cache_free(jbd2_revoke_table_cache, journal->j_revoke_table[0]);
return -ENOMEM;
out:
return table;
}
static void jbd2_journal_destroy_revoke_table(struct jbd2_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(jbd2_revoke_table_cache, table);
}
/* Initialise the revoke table for a given journal to a given size. */
int jbd2_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] = jbd2_journal_init_revoke_table(hash_size);
if (!journal->j_revoke_table[0])
goto fail0;
journal->j_revoke_table[1] = jbd2_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(jbd2_revoke_table_cache, journal->j_revoke_table[0]);
kmem_cache_free(jbd2_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:
jbd2_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 jbd2_journal_destroy_revoke(journal_t *journal)
{
struct jbd2_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(jbd2_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(jbd2_revoke_table_cache, table);
journal->j_revoke = NULL;
if (journal->j_revoke_table[0])
jbd2_journal_destroy_revoke_table(journal->j_revoke_table[0]);
if (journal->j_revoke_table[1])
jbd2_journal_destroy_revoke_table(journal->j_revoke_table[1]);
}