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io_uring: deduplicate file table slot calculation

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Extract a helper io_fixed_file_slot() returning a place in our fixed
files table, so we don't hand-code it three times in the code.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-02-04 13:52:07 +00:00 committed by Jens Axboe
parent 847595de17
commit ea64ec02b3
1 changed files with 19 additions and 22 deletions
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41
fs/io_uring.c
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@ -7740,6 +7740,15 @@ static void io_rsrc_put_work(struct work_struct *work)
}
}
static struct file **io_fixed_file_slot(struct fixed_rsrc_data *file_data,
unsigned i)
{
struct fixed_rsrc_table *table;
table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT];
return &table->files[i & IORING_FILE_TABLE_MASK];
}
static void io_rsrc_node_ref_zero(struct percpu_ref *ref)
{
struct fixed_rsrc_ref_node *ref_node;
@ -7808,6 +7817,7 @@ static void destroy_fixed_rsrc_ref_node(struct fixed_rsrc_ref_node *ref_node)
kfree(ref_node);
}
static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
unsigned nr_args)
{
@ -7840,9 +7850,6 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
goto out_free;
for (i = 0; i < nr_args; i++, ctx->nr_user_files++) {
struct fixed_rsrc_table *table;
unsigned index;
if (copy_from_user(&fd, &fds[i], sizeof(fd))) {
ret = -EFAULT;
goto out_fput;
@ -7867,9 +7874,7 @@ static int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
fput(file);
goto out_fput;
}
table = &file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;
table->files[index] = file;
*io_fixed_file_slot(file_data, i) = file;
}
ret = io_sqe_files_scm(ctx);
@ -7972,7 +7977,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
{
struct fixed_rsrc_data *data = ctx->file_data;
struct fixed_rsrc_ref_node *ref_node;
struct file *file;
struct file *file, **file_slot;
__s32 __user *fds;
int fd, i, err;
__u32 done;
@ -7990,9 +7995,6 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
fds = u64_to_user_ptr(up->data);
for (done = 0; done < nr_args; done++) {
struct fixed_rsrc_table *table;
unsigned index;
err = 0;
if (copy_from_user(&fd, &fds[done], sizeof(fd))) {
err = -EFAULT;
@ -8002,14 +8004,13 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
continue;
i = array_index_nospec(up->offset + done, ctx->nr_user_files);
table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
index = i & IORING_FILE_TABLE_MASK;
if (table->files[index]) {
file = table->files[index];
err = io_queue_file_removal(data, file);
file_slot = io_fixed_file_slot(ctx->file_data, i);
if (*file_slot) {
err = io_queue_file_removal(data, *file_slot);
if (err)
break;
table->files[index] = NULL;
*file_slot = NULL;
needs_switch = true;
}
if (fd != -1) {
@ -8031,13 +8032,12 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
err = -EBADF;
break;
}
table->files[index] = file;
err = io_sqe_file_register(ctx, file, i);
if (err) {
table->files[index] = NULL;
fput(file);
break;
}
*file_slot = file;
}
}
@ -9488,11 +9488,8 @@ static void __io_uring_show_fdinfo(struct io_ring_ctx *ctx, struct seq_file *m)
seq_printf(m, "SqThreadCpu:\t%d\n", sq ? task_cpu(sq->thread) : -1);
seq_printf(m, "UserFiles:\t%u\n", ctx->nr_user_files);
for (i = 0; has_lock && i < ctx->nr_user_files; i++) {
struct fixed_rsrc_table *table;
struct file *f;
struct file *f = *io_fixed_file_slot(ctx->file_data, i);
table = &ctx->file_data->table[i >> IORING_FILE_TABLE_SHIFT];
f = table->files[i & IORING_FILE_TABLE_MASK];
if (f)
seq_printf(m, "%5u: %s\n", i, file_dentry(f)->d_iname);
else