UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

io_uring: auto-removal for direct open/accept 

It might be inconvenient that direct open/accept deviates from the
update semantics and fails if the slot is taken instead of removing a
file sitting there. Implement this auto-removal.

Note that removal might need to allocate and so may fail. However, if an
empty slot is specified, it's guaraneed to not fail on the fd
installation side for valid userspace programs. It's needed for users
who can't tolerate such failures, e.g. accept where the other end
never retries.

Suggested-by: Franz-B. Tuneke <franz-bernhard.tuneke@tu-dortmund.de>
Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c896f14ea46b0eaa6c09d93149e665c2c37979b4.1631632300.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2021-09-14 16:12:52 +01:00 committed by Jens Axboe
parent 44df58d441
commit 9c7b0ba887
1 changed files with 34 additions and 18 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

52
fs/io_uring.c
View File

@ -8287,11 +8287,27 @@ static int io_sqe_file_register(struct io_ring_ctx *ctx, struct file *file,
#endif
}
static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
struct io_rsrc_node *node, void *rsrc)
{
struct io_rsrc_put *prsrc;
prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL);
if (!prsrc)
return -ENOMEM;
prsrc->tag = *io_get_tag_slot(data, idx);
prsrc->rsrc = rsrc;
list_add(&prsrc->list, &node->rsrc_list);
return 0;
}
static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
unsigned int issue_flags, u32 slot_index)
{
struct io_ring_ctx *ctx = req->ctx;
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
bool needs_switch = false;
struct io_fixed_file *file_slot;
int ret = -EBADF;
@ -8307,9 +8323,22 @@ static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
slot_index = array_index_nospec(slot_index, ctx->nr_user_files);
file_slot = io_fixed_file_slot(&ctx->file_table, slot_index);
ret = -EBADF;
if (file_slot->file_ptr)
goto err;
if (file_slot->file_ptr) {
struct file *old_file;
ret = io_rsrc_node_switch_start(ctx);
if (ret)
goto err;
old_file = (struct file *)(file_slot->file_ptr & FFS_MASK);
ret = io_queue_rsrc_removal(ctx->file_data, slot_index,
ctx->rsrc_node, old_file);
if (ret)
goto err;
file_slot->file_ptr = 0;
needs_switch = true;
}
*io_get_tag_slot(ctx->file_data, slot_index) = 0;
io_fixed_file_set(file_slot, file);
@ -8321,27 +8350,14 @@ static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
ret = 0;
err:
if (needs_switch)
io_rsrc_node_switch(ctx, ctx->file_data);
io_ring_submit_unlock(ctx, !force_nonblock);
if (ret)
fput(file);
return ret;
}
static int io_queue_rsrc_removal(struct io_rsrc_data *data, unsigned idx,
struct io_rsrc_node *node, void *rsrc)
{
struct io_rsrc_put *prsrc;
prsrc = kzalloc(sizeof(*prsrc), GFP_KERNEL);
if (!prsrc)
return -ENOMEM;
prsrc->tag = *io_get_tag_slot(data, idx);
prsrc->rsrc = rsrc;
list_add(&prsrc->list, &node->rsrc_list);
return 0;
}
static int __io_sqe_files_update(struct io_ring_ctx *ctx,
struct io_uring_rsrc_update2 *up,
unsigned nr_args)