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io_uring: split out fixed file installation and removal 

Put it with the filetable code, which is where it belongs. While doing
so, have the helpers take a ctx rather than an io_kiocb. It doesn't make
sense to use a request, as it's not an operation on the request itself.
It applies to the ring itself.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe 2022-06-13 04:42:56 -06:00
parent 8fcf4c48f4
commit f110ed8498
5 changed files with 63 additions and 51 deletions
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72
io_uring/filetable.c
View File

@ -58,11 +58,10 @@ void io_free_file_tables(struct io_file_table *table)
table->bitmap = NULL;
}
static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
unsigned int issue_flags, u32 slot_index)
static int io_install_fixed_file(struct io_ring_ctx *ctx, struct file *file,
u32 slot_index)
__must_hold(&req->ctx->uring_lock)
{
struct io_ring_ctx *ctx = req->ctx;
bool needs_switch = false;
struct io_fixed_file *file_slot;
int ret;
@ -108,6 +107,26 @@ err:
return ret;
}
int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
unsigned int file_slot)
{
bool alloc_slot = file_slot == IORING_FILE_INDEX_ALLOC;
int ret;
if (alloc_slot) {
ret = io_file_bitmap_get(ctx);
if (unlikely(ret < 0))
return ret;
file_slot = ret;
} else {
file_slot--;
}
ret = io_install_fixed_file(ctx, file, file_slot);
if (!ret && alloc_slot)
ret = file_slot;
return ret;
}
/*
* Note when io_fixed_fd_install() returns error value, it will ensure
* fput() is called correspondingly.
@ -115,27 +134,44 @@ err:
int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
struct file *file, unsigned int file_slot)
{
bool alloc_slot = file_slot == IORING_FILE_INDEX_ALLOC;
struct io_ring_ctx *ctx = req->ctx;
int ret;
io_ring_submit_lock(ctx, issue_flags);
if (alloc_slot) {
ret = io_file_bitmap_get(ctx);
if (unlikely(ret < 0))
goto err;
file_slot = ret;
} else {
file_slot--;
}
ret = io_install_fixed_file(req, file, issue_flags, file_slot);
if (!ret && alloc_slot)
ret = file_slot;
err:
ret = __io_fixed_fd_install(ctx, file, file_slot);
io_ring_submit_unlock(ctx, issue_flags);
if (unlikely(ret < 0))
fput(file);
return ret;
}
int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset)
{
struct io_fixed_file *file_slot;
struct file *file;
int ret;
if (unlikely(!ctx->file_data))
return -ENXIO;
if (offset >= ctx->nr_user_files)
return -EINVAL;
ret = io_rsrc_node_switch_start(ctx);
if (ret)
return ret;
offset = array_index_nospec(offset, ctx->nr_user_files);
file_slot = io_fixed_file_slot(&ctx->file_table, offset);
if (!file_slot->file_ptr)
return -EBADF;
file = (struct file *)(file_slot->file_ptr & FFS_MASK);
ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file);
if (ret)
return ret;
file_slot->file_ptr = 0;
io_file_bitmap_clear(&ctx->file_table, offset);
io_rsrc_node_switch(ctx, ctx->file_data);
return 0;
}

3
io_uring/filetable.h
View File

@ -29,6 +29,9 @@ void io_free_file_tables(struct io_file_table *table);
int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
struct file *file, unsigned int file_slot);
int __io_fixed_fd_install(struct io_ring_ctx *ctx, struct file *file,
unsigned int file_slot);
int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset);
unsigned int io_file_get_flags(struct file *file);

35
io_uring/openclose.c
View File

@ -173,42 +173,15 @@ void io_open_cleanup(struct io_kiocb *req)
putname(open->filename);
}
int __io_close_fixed(struct io_kiocb *req, unsigned int issue_flags,
int __io_close_fixed(struct io_ring_ctx *ctx, unsigned int issue_flags,
unsigned int offset)
{
struct io_ring_ctx *ctx = req->ctx;
struct io_fixed_file *file_slot;
struct file *file;
int ret;
io_ring_submit_lock(ctx, issue_flags);
ret = -ENXIO;
if (unlikely(!ctx->file_data))
goto out;
ret = -EINVAL;
if (offset >= ctx->nr_user_files)
goto out;
ret = io_rsrc_node_switch_start(ctx);
if (ret)
goto out;
offset = array_index_nospec(offset, ctx->nr_user_files);
file_slot = io_fixed_file_slot(&ctx->file_table, offset);
ret = -EBADF;
if (!file_slot->file_ptr)
goto out;
file = (struct file *)(file_slot->file_ptr & FFS_MASK);
ret = io_queue_rsrc_removal(ctx->file_data, offset, ctx->rsrc_node, file);
if (ret)
goto out;
file_slot->file_ptr = 0;
io_file_bitmap_clear(&ctx->file_table, offset);
io_rsrc_node_switch(ctx, ctx->file_data);
ret = 0;
out:
ret = io_fixed_fd_remove(ctx, offset);
io_ring_submit_unlock(ctx, issue_flags);
return ret;
}
@ -216,7 +189,7 @@ static inline int io_close_fixed(struct io_kiocb *req, unsigned int issue_flags)
{
struct io_close *close = io_kiocb_to_cmd(req);
return __io_close_fixed(req, issue_flags, close->file_slot - 1);
return __io_close_fixed(req->ctx, issue_flags, close->file_slot - 1);
}
int io_close_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe)

2
io_uring/openclose.h
View File

@ -1,6 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
int __io_close_fixed(struct io_kiocb *req, unsigned int issue_flags,
int __io_close_fixed(struct io_ring_ctx *ctx, unsigned int issue_flags,
unsigned int offset);
int io_openat_prep(struct io_kiocb *req, const struct io_uring_sqe *sqe);

2
io_uring/rsrc.c
View File

@ -703,7 +703,7 @@ static int io_files_update_with_index_alloc(struct io_kiocb *req,
if (ret < 0)
break;
if (copy_to_user(&fds[done], &ret, sizeof(ret))) {
__io_close_fixed(req, issue_flags, ret);
__io_close_fixed(req->ctx, issue_flags, ret);
ret = -EFAULT;
break;
}