This started out as an attempt to add mkdirat support to io_uring which is heavily based on renameat() / unlinkat() support. During the review process more operations were added (linkat, symlinkat, mknodat) mainly to keep things uniform internally (in namei.c), and with things changed in namei.c adding support for these operations to io_uring is trivial, so that was done too (except for mknodat). See https://lore.kernel.org/io-uring/20210514145259.wtl4xcsp52woi6ab@wittgenstein/ The first patch makes putname() ignore IS_ERR_OR_NULL names and converts a couple of places where the check was already implemented in the callers. No functional changes. The second one splits filename_lookup() that used to consume the passed struct filename * on error but not on the success (returning it) into two: filename_lookup(), that always consumes the name and __filename_lookup() that never does. This is a preparation change to enable the subsequent changes to filename_create and filename_lookup. No functional changes. The third patch is preparation with no functional changes, makes do_mkdirat accept struct filename pointer rather than the user string. The fourth one leverages that to implement mkdirat in io_uring. 5-8 just convert other similar do_* functions in namei.c to accept struct filename, for uniformity with do_mkdirat, do_renameat and do_unlinkat. No functional changes there. 9 changes do_* helpers in namei.c to return ints rather than some of them returning ints and some longs. 10-11 add symlinkat and linkat support to io_uring correspondingly. Based on for-5.14/io_uring. v8: - update filename_parentat() calling conventions to be uniform with the ones followed by (changed in subsequent patches) filename_create() and filename_lookup() v7: - rebase - make putname() ignore IS_ERR_OR_NULL names, remove conditional calls to it from the callers v6: - rebase - add safety checks for IOPOLL mode - add safety checks for unused sqe parts - drop mknodat support from io_uring as requested by Jens - add Christian's Acked-by v5: - rebase - add symlinkat, linkat and mknodat support to io_uring v4: - update do_mknodat, do_symlinkat and do_linkat to accept struct filename for uniformity with do_mkdirat, do_renameat and do_unlinkat; v3: - rebase; v2: - do not mess with struct filename's refcount in do_mkdirat, instead add and use __filename_create() that does not drop the name on success; Dmitry Kadashev (11): namei: ignore ERR/NULL names in putname() namei: change filename_parentat() calling conventions fs: make do_mkdirat() take struct filename io_uring: add support for IORING_OP_MKDIRAT fs: make do_mknodat() take struct filename fs: make do_symlinkat() take struct filename namei: add getname_uflags() fs: make do_linkat() take struct filename fs: update do_*() helpers to return ints io_uring: add support for IORING_OP_SYMLINKAT io_uring: add support for IORING_OP_LINKAT fs/exec.c | 8 +- fs/internal.h | 8 +- fs/io_uring.c | 196 ++++++++++++++++++++++++++++ fs/namei.c | 239 +++++++++++++++++++--------------- include/linux/fs.h | 1 + include/uapi/linux/io_uring.h | 4 + 6 files changed, 346 insertions(+), 110 deletions(-) -- 2.30.2
