LTP fcntl tests (fcntl11 fcntl14 fcntl17 fcntl19 fcntl20 fcntl21) have been
failing for NFSv4 mounts due to an unexpected l_pid. What follows are some
fixups:
v2: - Rebase onto linux-next
- Revert back to using the stack in locks_mandatory_area(), and fixup
patch description for 1/3
v3: - The lkp-robot found some serious per_thread_ops performance
regressions for v1 and v2, so this version changes things around to not
acquire a reference to struct pid in fl_nspid for every lock. Instead,
it drops fl_nspid altogether, and defers the lookup of the
namespace-translated pid until it actually needed.
v4: - Instead of looking up the virtual pid by way of referencing the struct
task of the that pid, instead use find_pid_ns() and pid_nr_ns(), which
avoids a the problem where we race to get a reference to the struct task
while it may be freed.
v5: - Squash previous 2/3 and 3/3 to avoid regression where F_GETLK would
return the init_ns pid instead of a translated pid.
v6: - State clearly how the differing cases of l_pid translation should be
handled, specifically regarding remote locks on remote files: that
fl_pid ought to be returned from the filesystem as <= 0 to indicate that
it makes no sense to translate this l_pid.
- Follow up with a patch to have filesystems negate fl_pid for remote
locks on remote files.
Benjamin Coddington (3):
fs/locks: Use allocation rather than the stack in fcntl_getlk()
fs/locks: Remove fl_nspid and use fs-specific l_pid for remote locks
staging/lustre, 9p, ceph, cifs, dlm: negate remote pids for F_GETLK
drivers/staging/lustre/lustre/ldlm/ldlm_flock.c | 2 +-
fs/9p/vfs_file.c | 2 +-
fs/ceph/locks.c | 2 +-
fs/cifs/cifssmb.c | 2 +-
fs/dlm/plock.c | 2 +-
fs/fuse/file.c | 6 +-
fs/locks.c | 108 ++++++++++++++----------
include/linux/fs.h | 2 +-
8 files changed, 72 insertions(+), 54 deletions(-)
--
2.9.3
