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io_uring: clean file_data access in files_register 

Keep file_data in a local var and replace with it complex references
such as ctx->file_data.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2020-10-10 18:34:14 +01:00 committed by Jens Axboe
parent 692d836351
commit 5398ae6985
1 changed files with 33 additions and 36 deletions
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69
fs/io_uring.c
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@ -7099,13 +7099,13 @@ static int io_sqe_files_scm(struct io_ring_ctx *ctx)
}
#endif
static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables,
unsigned nr_files)
static int io_sqe_alloc_file_tables(struct fixed_file_data *file_data,
unsigned nr_tables, unsigned nr_files)
{
int i;
for (i = 0; i < nr_tables; i++) {
struct fixed_file_table *table = &ctx->file_data->table[i];
struct fixed_file_table *table = &file_data->table[i];
unsigned this_files;
this_files = min(nr_files, IORING_MAX_FILES_TABLE);
@ -7120,7 +7120,7 @@ static int io_sqe_alloc_file_tables(struct io_ring_ctx *ctx, unsigned nr_tables,
return 0;
for (i = 0; i < nr_tables; i++) {
struct fixed_file_table *table = &ctx->file_data->table[i];
struct fixed_file_table *table = &file_data->table[i];
kfree(table->files);
}
return 1;
@ -7287,6 +7287,7 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
int fd, ret = 0;
unsigned i;
struct fixed_file_ref_node *ref_node;
struct fixed_file_data *file_data;
if (ctx->file_data)
return -EBUSY;
@ -7295,37 +7296,33 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
if (nr_args > IORING_MAX_FIXED_FILES)
return -EMFILE;
ctx->file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL);
if (!ctx->file_data)
file_data = kzalloc(sizeof(*ctx->file_data), GFP_KERNEL);
if (!file_data)
return -ENOMEM;
ctx->file_data->ctx = ctx;
init_completion(&ctx->file_data->done);
INIT_LIST_HEAD(&ctx->file_data->ref_list);
spin_lock_init(&ctx->file_data->lock);
file_data->ctx = ctx;
init_completion(&file_data->done);
INIT_LIST_HEAD(&file_data->ref_list);
spin_lock_init(&file_data->lock);
nr_tables = DIV_ROUND_UP(nr_args, IORING_MAX_FILES_TABLE);
ctx->file_data->table = kcalloc(nr_tables,
sizeof(struct fixed_file_table),
GFP_KERNEL);
if (!ctx->file_data->table) {
kfree(ctx->file_data);
ctx->file_data = NULL;
file_data->table = kcalloc(nr_tables, sizeof(file_data->table),
GFP_KERNEL);
if (!file_data->table) {
kfree(file_data);
return -ENOMEM;
}
if (percpu_ref_init(&ctx->file_data->refs, io_file_ref_kill,
if (percpu_ref_init(&file_data->refs, io_file_ref_kill,
PERCPU_REF_ALLOW_REINIT, GFP_KERNEL)) {
kfree(ctx->file_data->table);
kfree(ctx->file_data);
ctx->file_data = NULL;
kfree(file_data->table);
kfree(file_data);
return -ENOMEM;
}
if (io_sqe_alloc_file_tables(ctx, nr_tables, nr_args)) {
percpu_ref_exit(&ctx->file_data->refs);
kfree(ctx->file_data->table);
kfree(ctx->file_data);
ctx->file_data = NULL;
if (io_sqe_alloc_file_tables(file_data, nr_tables, nr_args)) {
percpu_ref_exit(&file_data->refs);
kfree(file_data->table);
kfree(file_data);
return -ENOMEM;
}
@ -7342,7 +7339,7 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
continue;
}
table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;
file = fget(fd);
@ -7372,16 +7369,16 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
fput(file);
}
for (i = 0; i < nr_tables; i++)
kfree(ctx->file_data->table[i].files);
kfree(file_data->table[i].files);
percpu_ref_exit(&ctx->file_data->refs);
kfree(ctx->file_data->table);
kfree(ctx->file_data);
ctx->file_data = NULL;
percpu_ref_exit(&file_data->refs);
kfree(file_data->table);
kfree(file_data);
ctx->nr_user_files = 0;
return ret;
}
ctx->file_data = file_data;
ret = io_sqe_files_scm(ctx);
if (ret) {
io_sqe_files_unregister(ctx);
@ -7394,11 +7391,11 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
return PTR_ERR(ref_node);
}
ctx->file_data->cur_refs = &ref_node->refs;
spin_lock(&ctx->file_data->lock);
list_add(&ref_node->node, &ctx->file_data->ref_list);
spin_unlock(&ctx->file_data->lock);
percpu_ref_get(&ctx->file_data->refs);
file_data->cur_refs = &ref_node->refs;
spin_lock(&file_data->lock);
list_add(&ref_node->node, &file_data->ref_list);
spin_unlock(&file_data->lock);
percpu_ref_get(&file_data->refs);
return ret;
}