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io_uring: add helpers for 2 level table alloc

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Some parts like fixed file table use 2 level tables, factor out helpers
for allocating/deallocating them as more users are to come.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/1709212359cd82eb416d395f86fc78431ccfc0aa.1623634181.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-06-14 02:36:20 +01:00 committed by Jens Axboe
parent 157d257f99
commit 9123c8ffce
1 changed files with 43 additions and 30 deletions
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73
fs/io_uring.c
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@ -7059,14 +7059,36 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events,
return READ_ONCE(rings->cq.head) == READ_ONCE(rings->cq.tail) ? ret : 0;
}
static void io_free_file_tables(struct io_file_table *table, unsigned nr_files)
static void io_free_page_table(void **table, size_t size)
{
unsigned i, nr_tables = DIV_ROUND_UP(nr_files, IORING_MAX_FILES_TABLE);
unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE);
for (i = 0; i < nr_tables; i++)
kfree(table->files[i]);
kfree(table->files);
table->files = NULL;
kfree(table[i]);
kfree(table);
}
static void **io_alloc_page_table(size_t size)
{
unsigned i, nr_tables = DIV_ROUND_UP(size, PAGE_SIZE);
size_t init_size = size;
void **table;
table = kcalloc(nr_tables, sizeof(*table), GFP_KERNEL);
if (!table)
return NULL;
for (i = 0; i < nr_tables; i++) {
unsigned int this_size = min(size, PAGE_SIZE);
table[i] = kzalloc(this_size, GFP_KERNEL);
if (!table[i]) {
io_free_page_table(table, init_size);
return NULL;
}
size -= this_size;
}
return table;
}
static inline void io_rsrc_ref_lock(struct io_ring_ctx *ctx)
@ -7195,6 +7217,22 @@ static int io_rsrc_data_alloc(struct io_ring_ctx *ctx, rsrc_put_fn *do_put,
return 0;
}
static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files)
{
size_t size = nr_files * sizeof(struct io_fixed_file);
table->files = (struct io_fixed_file **)io_alloc_page_table(size);
return !!table->files;
}
static void io_free_file_tables(struct io_file_table *table, unsigned nr_files)
{
size_t size = nr_files * sizeof(struct io_fixed_file);
io_free_page_table((void **)table->files, size);
table->files = NULL;
}
static void __io_sqe_files_unregister(struct io_ring_ctx *ctx)
{
#if defined(CONFIG_UNIX)
@ -7456,31 +7494,6 @@ static int io_sqe_files_scm(struct io_ring_ctx *ctx)
}
#endif
static bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files)
{
unsigned i, nr_tables = DIV_ROUND_UP(nr_files, IORING_MAX_FILES_TABLE);
table->files = kcalloc(nr_tables, sizeof(*table->files), GFP_KERNEL);
if (!table->files)
return false;
for (i = 0; i < nr_tables; i++) {
unsigned int this_files = min(nr_files, IORING_MAX_FILES_TABLE);
table->files[i] = kcalloc(this_files, sizeof(*table->files[i]),
GFP_KERNEL);
if (!table->files[i])
break;
nr_files -= this_files;
}
if (i == nr_tables)
return true;
io_free_file_tables(table, nr_tables * IORING_MAX_FILES_TABLE);
return false;
}
static void io_rsrc_file_put(struct io_ring_ctx *ctx, struct io_rsrc_put *prsrc)
{
struct file *file = prsrc->file;