The originally chosen numbers interfere with downstream projects'
syscalls. Move them to the end of the syscall table instead.
Reported by: jrtc27
Reviewed by: brooks
MFC-With: 022ca2fc7fe08d51f33a1d23a9be49e6d132914e
Differential Revision: 022ca2fc7fe08d51f33a1d23a9be49e6d132914e
aio_fsync(O_DSYNC, ...) is the asynchronous version of fdatasync(2).
Reviewed by: kib, asomers, jhb
Differential Review: https://reviews.freebsd.org/D25071
POSIX O_DSYNC means that writes include an implicit fdatasync(2), just
as O_SYNC implies fsync(2).
VOP_WRITE() functions that understand the new IO_DATASYNC flag can act
accordingly, but we'll still pass down IO_SYNC so that file systems that
don't understand it will continue to provide the stronger O_SYNC
behaviour.
Flag also applies to fcntl(2).
Reviewed by: kib, delphij
Differential Revision: https://reviews.freebsd.org/D25090
vn_rdwr() must lock the entire file range for IO_APPEND
just like vn_io_fault() does for O_APPEND.
Reviewed by: kib, imp, mckusick
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D28008
When INVARIANTS is configred, the sendfile_iodone() callback verifies
that pages attached to the sendfile header are wired, but we unwire all
such pages after a synchronous pager error, before calling
sendfile_iodone().
Reported by: pho
Tested by: pho
Sponsored by: The FreeBSD Foundation
We have the d_off field in struct dirent for providing the seek offset
of the next directory entry. Several filesystems were not initializing
the field, which ends up being copied out to userland.
Reported by: Syed Faraz Abrar <faraz@elttam.com>
Reviewed by: kib
MFC after: 3 days
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27792
POSIX AIO is great, but it lacks vectored I/O functions. This commit
fixes that shortcoming by adding aio_writev and aio_readv. They aren't
part of the standard, but they're an obvious extension. They work just
like their synchronous equivalents pwritev and preadv.
It isn't yet possible to use vectored aiocbs with lio_listio, but that
could be added in the future.
Reviewed by: jhb, kib, bcr
Relnotes: yes
Differential Revision: https://reviews.freebsd.org/D27743
The change to kern_jail_set that was supposed to "also properly clean
up when attachment fails" didn't fix a memory leak but actually caused
a double free. Back that part out, and leave the part that manages
allprison_lock state.
Not all debugger operations that enumerate threads require thread
stacks to be resident in memory to be useful. Instead, push P_INMEM
checks (if needed) into callers.
Reviewed by: kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D27827
Processes part way through exit1() are not included in allproc. Using
allproc to enumerate processes prevented getting the stack trace of a
thread in this part of exit1() via ddb.
Reviewed by: kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D27826
This is used by kernel debuggers to enumerate processes via the pid
hash table.
Reviewed by: kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D27825
Exiting processes that have been removed from allproc but are still
executing are not yet marked PRS_ZOMBIE, so they were not listed (for
example, if a thread panics during exit1()). To detect these
processes, clear p_list.le_prev to NULL explicitly after removing a
process from the allproc list and check for this sentinel rather than
PRS_ZOMBIE when walking the pidhash.
While here, simplify the pidhash walk to use a single outer loop.
Reviewed by: kib
Sponsored by: Netflix
Differential Revision: https://reviews.freebsd.org/D27824
Keep explicit track of the allprison_lock state during the final part
of kern_jail_set, instead of deducing it from the JAIL_ATTACH flag.
Also properly clean up when the attachment fails, fixing a long-
standing (though minor) memory leak.
Both FreeBSD and Linux mkdir -p walk the tree up ignoring any EEXIST on
the way and both are used a lot when building respective kernels.
This poses a problem as spurious locking avoidably interferes with
concurrent operations like getdirentries on affected directories.
Work around the problem by adding FAILIFEXISTS flag. In case of lockless
lookup this manages to avoid any work to begin with, there is no speed
up for the locked case but perhaps this can be augmented later on.
For simplicity the only supported semantics are as used by mkdir.
Reviewed by: kib (previous version)
Differential Revision: https://reviews.freebsd.org/D27789
The previous patch failed to set the ISDOTDOT flag when appropriate,
which in turn fail to properly handle degenerate lookups.
While here sprinkle some extra assertions.
Tested by: pho (previous version)
