6.10-stable review patch. If anyone has any objections, please let me know.
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From: Gabriel Krisman Bertazi krisman@suse.de
[ Upstream commit 3e05b222382ec67dce7358d50b6006e91d028d8b ]
io_probe checks io_issue_def->not_supported, but we never really set that field, as we mark non-supported functions through a specific ->prep handler. This means we end up returning IO_URING_OP_SUPPORTED, even for disabled operations. Fix it by just checking the prep handler itself.
Fixes: 66f4af93da57 ("io_uring: add support for probing opcodes") Signed-off-by: Gabriel Krisman Bertazi krisman@suse.de Link: https://lore.kernel.org/r/20240619020620.5301-2-krisman@suse.de Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Sasha Levin sashal@kernel.org --- io_uring/opdef.c | 8 ++++++++ io_uring/opdef.h | 4 ++-- io_uring/register.c | 2 +- 3 files changed, 11 insertions(+), 3 deletions(-)
diff --git a/io_uring/opdef.c b/io_uring/opdef.c index 2e3b7b16effb3..760006ccc4083 100644 --- a/io_uring/opdef.c +++ b/io_uring/opdef.c @@ -725,6 +725,14 @@ const char *io_uring_get_opcode(u8 opcode) return "INVALID"; }
+bool io_uring_op_supported(u8 opcode) +{ + if (opcode < IORING_OP_LAST && + io_issue_defs[opcode].prep != io_eopnotsupp_prep) + return true; + return false; +} + void __init io_uring_optable_init(void) { int i; diff --git a/io_uring/opdef.h b/io_uring/opdef.h index 7ee6f5aa90aa3..14456436ff74a 100644 --- a/io_uring/opdef.h +++ b/io_uring/opdef.h @@ -17,8 +17,6 @@ struct io_issue_def { unsigned poll_exclusive : 1; /* op supports buffer selection */ unsigned buffer_select : 1; - /* opcode is not supported by this kernel */ - unsigned not_supported : 1; /* skip auditing */ unsigned audit_skip : 1; /* supports ioprio */ @@ -47,5 +45,7 @@ struct io_cold_def { extern const struct io_issue_def io_issue_defs[]; extern const struct io_cold_def io_cold_defs[];
+bool io_uring_op_supported(u8 opcode); + void io_uring_optable_init(void); #endif diff --git a/io_uring/register.c b/io_uring/register.c index c0010a66a6f2c..11517b34cfc8f 100644 --- a/io_uring/register.c +++ b/io_uring/register.c @@ -113,7 +113,7 @@ static __cold int io_probe(struct io_ring_ctx *ctx, void __user *arg,
for (i = 0; i < nr_args; i++) { p->ops[i].op = i; - if (!io_issue_defs[i].not_supported) + if (io_uring_op_supported(i)) p->ops[i].flags = IO_URING_OP_SUPPORTED; } p->ops_len = i;