One of the key architectual tenets of io-uring is to keep the
parameters for io-uring stable. After the call has been submitted,
its value can be changed. Unfortunaltely this is not the case for
the current statx implementation.
Patch:
Part 1: fs: replace const char* parameter in vfs_statx and do_statx with
struct filename
Create filename object outside of do_statx and vfs_statx, so io-uring
can create the filename object during the prepare phase
Part 2: io-uring: Copy path name during prepare stage for statx
Create and store filename object during prepare phase
There is also a patch for the liburing libray to add a new test case. This
patch makes sure that the api is stable.
"liburing: add test for stable statx api"
The patch has been tested with the liburing test suite and fstests.
Changes:
V2: don't check name in vfs_fstatat
V3: don't check name in statx syscall
V4: - incorporate Steven Rostedt's fix
- Merge both patches to avoid bisect problem
(the io-uring changes have a dependency on the parameter change in
the fs layer)
Stefan Roesch (1):
io-uring: Make statx API stable
fs/internal.h | 4 +++-
fs/io_uring.c | 22 ++++++++++++++++++++--
fs/stat.c | 49 +++++++++++++++++++++++++++++++++++--------------
3 files changed, 58 insertions(+), 17 deletions(-)
base-commit: 5c1ee569660d4a205dced9cb4d0306b907fb7599
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2.30.2
