Messages in this thread Patch in this message | | | From | Peng Tao <> | Subject | [PATCH 08/39] staging/lustre/libcfs: improve validity test for valid file descriptors | Date | Fri, 15 Nov 2013 00:32:31 +0800 |
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From: Bob Glossman <bob.glossman@intel.com>
File descriptor members of struct lustre_kernelcomm aren't set to anything special at start time. This leads to incorrect tests and skipping valid fd closes at stop time. Fixed by defining, setting, and testing against a specific LK_NOFD value.
Lustre-change: http://review.whamcloud.com/7275 Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-3683 Signed-off-by: Bob Glossman <bob.glossman@intel.com> Reviewed-by: John L. Hammond <john.hammond@intel.com> Reviewed-by: Keith Mannthey <keith.mannthey@intel.com> Reviewed-by: Oleg Drokin <oleg.drokin@intel.com> Signed-off-by: Peng Tao <bergwolf@gmail.com> Signed-off-by: Andreas Dilger <andreas.dilger@intel.com> --- .../include/linux/libcfs/libcfs_kernelcomm.h | 1 + .../lustre/lustre/libcfs/kernel_user_comm.c | 10 ++++++++-- 2 files changed, 9 insertions(+), 2 deletions(-)
diff --git a/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h b/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h index 596a15f..4e12ffc 100644 --- a/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h +++ b/drivers/staging/lustre/include/linux/libcfs/libcfs_kernelcomm.h @@ -97,6 +97,7 @@ extern int libcfs_kkuc_group_foreach(int group, libcfs_kkuc_cb_t cb_func, void *cb_arg); #define LK_FLG_STOP 0x01 +#define LK_NOFD -1U /* kernelcomm control structure, passed from userspace to kernel */ typedef struct lustre_kernelcomm { diff --git a/drivers/staging/lustre/lustre/libcfs/kernel_user_comm.c b/drivers/staging/lustre/lustre/libcfs/kernel_user_comm.c index 74a0db5..9e5e3cc 100644 --- a/drivers/staging/lustre/lustre/libcfs/kernel_user_comm.c +++ b/drivers/staging/lustre/lustre/libcfs/kernel_user_comm.c @@ -56,6 +56,8 @@ int libcfs_ukuc_start(lustre_kernelcomm *link, int group) { int pfd[2]; + link->lk_rfd = link->lk_wfd = LK_NOFD; + if (pipe(pfd) < 0) return -errno; @@ -69,9 +71,13 @@ int libcfs_ukuc_start(lustre_kernelcomm *link, int group) int libcfs_ukuc_stop(lustre_kernelcomm *link) { - if (link->lk_wfd > 0) + int rc; + + if (link->lk_wfd != LK_NOFD) close(link->lk_wfd); - return close(link->lk_rfd); + rc = close(link->lk_rfd); + link->lk_rfd = link->lk_wfd = LK_NOFD; + return rc; } #define lhsz sizeof(*kuch) -- 1.7.9.5
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