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From: Pavel Begunkov <[email protected]>
To: Jens Axboe <[email protected]>, [email protected]
Subject: [PATCH v4 25/26] io_uring: encapsulate fixed files into struct
Date: Thu,  1 Apr 2021 15:44:04 +0100	[thread overview]
Message-ID: <78669731a605a7614c577c3de552631cfaf0869a.1617287883.git.asml.silence@gmail.com> (raw)
In-Reply-To: <[email protected]>

Add struct io_fixed_file representing a single registered file, first to
hide ugly struct file **, which may be misleading, and secondly to
retype it to unsigned long as conversions to it and back to file * for
handling and masking FFS_* flags are getting nasty.

Signed-off-by: Pavel Begunkov <[email protected]>
---
 fs/io_uring.c | 32 +++++++++++++++++++-------------
 1 file changed, 19 insertions(+), 13 deletions(-)

diff --git a/fs/io_uring.c b/fs/io_uring.c
index a9984ca025ba..c1d9fface7f4 100644
--- a/fs/io_uring.c
+++ b/fs/io_uring.c
@@ -207,6 +207,11 @@ struct io_overflow_cqe {
 	struct list_head list;
 };
 
+struct io_fixed_file {
+	/* file * with additional FFS_* flags */
+	unsigned long file_ptr;
+};
+
 struct io_rsrc_put {
 	struct list_head list;
 	union {
@@ -216,7 +221,7 @@ struct io_rsrc_put {
 };
 
 struct fixed_rsrc_table {
-	struct file		**files;
+	struct io_fixed_file *files;
 };
 
 struct io_rsrc_node {
@@ -6255,8 +6260,8 @@ static void io_wq_submit_work(struct io_wq_work *work)
 #endif
 #define FFS_MASK		~(FFS_ASYNC_READ|FFS_ASYNC_WRITE|FFS_ISREG)
 
-static inline struct file **io_fixed_file_slot(struct io_rsrc_data *file_data,
-					       unsigned i)
+static inline struct io_fixed_file *io_fixed_file_slot(struct io_rsrc_data *file_data,
+						      unsigned i)
 {
 	struct fixed_rsrc_table *table;
 
@@ -6267,12 +6272,12 @@ static inline struct file **io_fixed_file_slot(struct io_rsrc_data *file_data,
 static inline struct file *io_file_from_index(struct io_ring_ctx *ctx,
 					      int index)
 {
-	struct file **file_slot = io_fixed_file_slot(ctx->file_data, index);
+	struct io_fixed_file *slot = io_fixed_file_slot(ctx->file_data, index);
 
-	return (struct file *) ((unsigned long) *file_slot & FFS_MASK);
+	return (struct file *) (slot->file_ptr & FFS_MASK);
 }
 
-static void io_fixed_file_set(struct file **file_slot, struct file *file)
+static void io_fixed_file_set(struct io_fixed_file *file_slot, struct file *file)
 {
 	unsigned long file_ptr = (unsigned long) file;
 
@@ -6282,7 +6287,7 @@ static void io_fixed_file_set(struct file **file_slot, struct file *file)
 		file_ptr |= FFS_ASYNC_WRITE;
 	if (S_ISREG(file_inode(file)->i_mode))
 		file_ptr |= FFS_ISREG;
-	*file_slot = (struct file *)file_ptr;
+	file_slot->file_ptr = file_ptr;
 }
 
 static struct file *io_file_get(struct io_submit_state *state,
@@ -6297,7 +6302,7 @@ static struct file *io_file_get(struct io_submit_state *state,
 		if (unlikely((unsigned int)fd >= ctx->nr_user_files))
 			return NULL;
 		fd = array_index_nospec(fd, ctx->nr_user_files);
-		file_ptr = (unsigned long) *io_fixed_file_slot(ctx->file_data, fd);
+		file_ptr = io_fixed_file_slot(ctx->file_data, fd)->file_ptr;
 		file = (struct file *) (file_ptr & FFS_MASK);
 		file_ptr &= ~FFS_MASK;
 		/* mask in overlapping REQ_F and FFS bits */
@@ -7733,7 +7738,8 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
 				 unsigned nr_args)
 {
 	struct io_rsrc_data *data = ctx->file_data;
-	struct file *file, **file_slot;
+	struct io_fixed_file *file_slot;
+	struct file *file;
 	__s32 __user *fds;
 	int fd, i, err;
 	__u32 done;
@@ -7760,12 +7766,12 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
 		i = array_index_nospec(up->offset + done, ctx->nr_user_files);
 		file_slot = io_fixed_file_slot(ctx->file_data, i);
 
-		if (*file_slot) {
-			file = (struct file *) ((unsigned long) *file_slot & FFS_MASK);
+		if (file_slot->file_ptr) {
+			file = (struct file *)(file_slot->file_ptr & FFS_MASK);
 			err = io_queue_rsrc_removal(data, ctx->rsrc_node, file);
 			if (err)
 				break;
-			*file_slot = NULL;
+			file_slot->file_ptr = 0;
 			needs_switch = true;
 		}
 		if (fd != -1) {
@@ -7790,7 +7796,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
 			io_fixed_file_set(file_slot, file);
 			err = io_sqe_file_register(ctx, file, i);
 			if (err) {
-				*file_slot = NULL;
+				file_slot->file_ptr = 0;
 				fput(file);
 				break;
 			}
-- 
2.24.0


  parent reply	other threads:[~2021-04-01 18:07 UTC|newest]

Thread overview: 29+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-04-01 14:43 [PATCH v4 00/26] ctx wide rsrc nodes + Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 01/26] io_uring: name rsrc bits consistently Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 02/26] io_uring: simplify io_rsrc_node_ref_zero Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 03/26] io_uring: use rsrc prealloc infra for files reg Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 04/26] io_uring: encapsulate rsrc node manipulations Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 05/26] io_uring: move rsrc_put callback into io_rsrc_data Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 06/26] io_uring: refactor io_queue_rsrc_removal() Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 07/26] io_uring: ctx-wide rsrc nodes Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 08/26] io_uring: reuse io_rsrc_node_destroy() Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 09/26] io_uring: remove useless is_dying check on quiesce Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 10/26] io_uring: refactor rw reissue Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 11/26] io_uring: combine lock/unlock sections on exit Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 12/26] io_uring: better ref handling in poll_remove_one Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 13/26] io_uring: remove unused hash_wait Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 14/26] io_uring: refactor io_async_cancel() Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 15/26] io_uring: improve import_fixed overflow checks Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 16/26] io_uring: store reg buffer end instead of length Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 17/26] io_uring: kill unused forward decls Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 18/26] io_uring: lock annotate timeouts and poll Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 19/26] io_uring: simplify overflow handling Pavel Begunkov
2021-04-01 14:43 ` [PATCH v4 20/26] io_uring: put link timeout req consistently Pavel Begunkov
2021-04-01 14:44 ` [PATCH v4 21/26] io_uring: deduplicate NOSIGNAL setting Pavel Begunkov
2021-04-01 14:44 ` [PATCH v4 22/26] io_uring: set proper FFS* flags on reg file update Pavel Begunkov
2021-04-01 14:44 ` [PATCH v4 23/26] io_uring: don't quiesce intial files register Pavel Begunkov
2021-04-01 14:44 ` [PATCH v4 24/26] io_uring: refactor file tables alloc/free Pavel Begunkov
2021-04-01 14:44 ` Pavel Begunkov [this message]
2021-04-01 14:44 ` [PATCH v4 26/26] io_uring: kill outdated comment about splice punt Pavel Begunkov
2021-04-04 19:16 ` [PATCH v4 00/26] ctx wide rsrc nodes + Jens Axboe
2021-04-04 19:22   ` Pavel Begunkov

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