Hi Guys, We meet below issue which need all of you help. -Question 1、Recently We meet one confuse issue. Sometimes android java application file.exsits will return false even ls -al can successflly list /data/vendor/nfs/mount/DVR/media/dvr_sdcard0/nfs_ready.flag.file. file permission is -rw-rw-rw- 2、We use native C++ application access api to access that file, it can successfully access file too. If restart device, the issue remains the same and can not recover. If mannually chmod 777 to /data/vendor/nfs/mount/DVR/media/dvr_sdcard0/nfs_ready.flag.file, application will successfully access. If restart device again, nfs_ready.flag.file will restore to 666 (-rw-rw-rw-）and Java application can successfully access too. We feel confused why it happened. 3、After add sunrpc debug to kernel, we found that nfs permission denied in nfs_execute_ok(-EACCES). You can read trace log in below. Java API File exisit: sa8155_v35:/ # dmesg [ 168.383021] NFS call access [ 168.383906] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 168.383911] NFS reply access: 0 [ 168.383916] NFS: permission(0:30/2525216000), mask=0x1, res=0 [ 168.383939] NFS call lookup media [ 168.384801] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 168.384809] NFS reply lookup: 0 [ 168.384814] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 168.384822] NFS: nfs_lookup_revalidate_done(/media) is valid [ 168.384829] NFS call access [ 168.385694] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 168.385699] NFS reply access: 0 [ 168.385703] NFS: permission(0:30/42757), mask=0x1, res=-13 [ 168.578734] NFS: nfs_weak_revalidate: inode 2525216000 is valid sa8155_v35:/ # ls -al /data/vendor/nfs/mount/DVR/media/dvr_sdcard0/nfs_ready.flag.file [ 127.410222] NFS call access [ 127.411278] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 127.411283] NFS reply access: 0 [ 127.411984] NFS: permission(0:30/2525216000), mask=0x1, res=0 [ 127.412003] NFS: lookup(/media) [ 127.412008] NFS call lookup media [ 127.412562] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 127.412566] NFS reply lookup: 0 [ 127.412576] NFS: nfs_fhget(0:30/42757 fh_crc=0x9466d356 ct=1) [ 127.412585] NFS call access [ 127.423788] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 127.423794] NFS reply access: 0 [ 127.423961] NFS: permission(0:30/42757), mask=0x1, res=0 [ 127.423970] NFS: lookup(media/dvr_sdcard0) [ 127.423974] NFS call lookup dvr_sdcard0 [ 127.424645] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 127.424649] NFS reply lookup: 0 [ 127.424659] NFS: nfs_fhget(0:30/128 fh_crc=0x8bcac245 ct=1) [ 127.424668] NFS call lookup dvr_sdcard0 [ 127.425141] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 127.425145] NFS reply lookup: 0 [ 127.425160] --> nfs_xdev_mount() [ 127.425260] NFS call fsinfo [ 127.425783] NFS reply fsinfo: 0 [ 127.425788] NFS call pathconf [ 127.426159] NFS reply pathconf: -521 [ 127.428048] do_proc_get_root: call fsinfo [ 127.428802] do_proc_get_root: reply fsinfo: 0 [ 127.428814] NFS: nfs_fhget(0:31/128 fh_crc=0x8bcac245 ct=1) [ 127.428827] <-- nfs_xdev_mount() = 0 [ 127.429219] NFS call access [ 127.429890] NFS: nfs_update_inode(0:31/128 fh_crc=0x8bcac245 ct=2 info=0x27e7f) [ 127.429895] NFS reply access: 0 [ 127.429900] NFS: permission(0:31/128), mask=0x1, res=0 [ 127.429908] NFS: lookup(/nfs_ready.flag.file) [ 127.429912] NFS call lookup nfs_ready.flag.file [ 127.432195] NFS: nfs_update_inode(0:31/128 fh_crc=0x8bcac245 ct=2 info=0x27e7f) [ 127.432201] NFS reply lookup: 0 [ 127.432226] NFS: nfs_fhget(0:31/261 fh_crc=0xae0e68a5 ct=1) [ 127.432252] NFS: dentry_delete(/nfs_ready.flag.file, 40088c) [ 127.433273] ls (10174) used greatest stack depth: 10480 bytes left [ 128.260482] NFS: nfs_weak_revalidate: inode 2525216000 is valid [ 129.308862] NFS: nfs_weak_revalidate: inode 2525216000 is valid HAL C++ File API: [ 285.296718] NFS call fsstat [ 285.297643] NFS reply fsstat: 0 [ 285.297670] NFS: permission(0:30/2525216000), mask=0x1, res=0 [ 285.297676] NFS call lookup media [ 285.298436] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 285.298441] NFS reply lookup: 0 [ 285.298445] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.298450] NFS: nfs_lookup_revalidate_done(/media) is valid [ 285.298455] NFS: permission(0:30/42757), mask=0x1, res=0 [ 285.298461] NFS call lookup dvr_sdcard0 [ 285.299099] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.299103] NFS reply lookup: 0 [ 285.299107] NFS: nfs_update_inode(0:30/128 fh_crc=0x8bcac245 ct=1 info=0x27e7f) [ 285.299111] NFS: nfs_lookup_revalidate_done(media/dvr_sdcard0) is valid [ 285.299117] NFS: nfs_weak_revalidate: inode 128 is valid [ 285.299137] NFS: permission(0:30/2525216000), mask=0x1, res=0 [ 285.299141] NFS call lookup media [ 285.299724] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 285.299728] NFS reply lookup: 0 [ 285.299732] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.299736] NFS: nfs_lookup_revalidate_done(/media) is valid [ 285.299741] NFS: permission(0:30/42757), mask=0x1, res=0 [ 285.299746] NFS call lookup dvr_sdcard0 [ 285.300488] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.300492] NFS reply lookup: 0 [ 285.300495] NFS: nfs_update_inode(0:30/128 fh_crc=0x8bcac245 ct=1 info=0x27e7f) [ 285.300499] NFS: nfs_lookup_revalidate_done(media/dvr_sdcard0) is valid [ 285.300504] NFS: nfs_weak_revalidate: inode 128 is valid [ 285.300511] NFS call fsstat [ 285.302187] NFS reply fsstat: 0 [ 285.327504] NFS: nfs_weak_revalidate: inode 2525216000 is valid [ 285.327556] NFS: nfs_weak_revalidate: inode 2525216000 is valid [ 285.327570] NFS call fsstat [ 285.328683] NFS reply fsstat: 0 [ 285.328734] NFS: permission(0:30/2525216000), mask=0x1, res=0 [ 285.328764] NFS call lookup media [ 285.329636] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 285.329648] NFS reply lookup: 0 [ 285.329658] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.329669] NFS: nfs_lookup_revalidate_done(/media) is valid [ 285.329681] NFS: permission(0:30/42757), mask=0x1, res=0 [ 285.329694] NFS call lookup dvr_sdcard0 [ 285.331196] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.331209] NFS reply lookup: 0 [ 285.331218] NFS: nfs_update_inode(0:30/128 fh_crc=0x8bcac245 ct=1 info=0x27e7f) [ 285.331231] NFS: nfs_lookup_revalidate_done(media/dvr_sdcard0) is valid [ 285.331246] NFS: nfs_weak_revalidate: inode 128 is valid [ 285.331301] NFS: permission(0:30/2525216000), mask=0x1, res=0 [ 285.331333] NFS call lookup media [ 285.332307] NFS: nfs_update_inode(0:30/2525216000 fh_crc=0x69ed2ad0 ct=2 info=0x27e7f) [ 285.332319] NFS reply lookup: 0 [ 285.332327] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.332337] NFS: nfs_lookup_revalidate_done(/media) is valid [ 285.332348] NFS: permission(0:30/42757), mask=0x1, res=0 [ 285.332361] NFS call lookup dvr_sdcard0 [ 285.333321] NFS: nfs_update_inode(0:30/42757 fh_crc=0x9466d356 ct=1 info=0x27e7f) [ 285.333331] NFS reply lookup: 0 [ 285.333341] NFS: nfs_update_inode(0:30/128 fh_crc=0x8bcac245 ct=1 info=0x27e7f) [ 285.333353] NFS: nfs_lookup_revalidate_done(media/dvr_sdcard0) is valid [ 285.333365] NFS: nfs_weak_revalidate: inode 128 is valid [ 285.333379] NFS call fsstat [ 285.336596] NFS reply fsstat: 0 ============================== Android9.0 saxxx:/data/vendor/nfs/mount # ls -al total 52 drwxrwxrwx 11 root root 4096 2020-01-01 00:00 . drwxrwxrwx 4 root root 4096 1970-01-01 08:00 .. drwxrwxrwx 2 root root 4096 2020-01-01 00:00 CHWM_V3 drwxrwxrwx 2 root root 4096 2020-01-01 00:11 DVR drwxrwxrwx 2 root root 4096 2020-01-01 00:00 MINI drwxrwxrwx 2 root root 4096 2020-01-01 00:00 bootanimation drwxrwxrwx 2 root root 4096 2020-01-01 00:00 common drwxrwxrwx 2 root root 4096 2020-01-01 00:00 coredump drwxrwxrwx 3 root root 4096 2020-01-01 00:00 fota drwxrwxrwx 3 root root 4096 2020-01-01 00:00 qlog drwxrwxrwx 2 root root 4096 2020-01-01 00:00 themes 2、insert TF card to QNX USB Port saxxx:/data/vendor/nfs/mount # ls -al DVR/ total 36 drwxrwxrwx 2 root root 4096 2020-01-01 00:01 . drwxrwxrwx 11 root root 4096 2020-01-01 00:00 .. -rw-r--r-- 1 root root 24576 2020-01-01 00:01 .recordfile_front.db dr-xr-xr-x 2 root root 0 2020-01-01 00:01 media 3、 saxxx:/data/vendor/nfs/mount # ls -al DVR/media/dvr_sdcard0/ total 2508 drwxrwxrwx 3 root root 4096 2020-01-01 00:01 . dr-xr-xr-x 2 root root 0 2020-01-01 00:02 .. drwxrwxrwx 6 root root 4096 2020-01-01 00:01 ExternalDVR -rw-rw-rw- 1 root root 2560000 2020-01-01 00:01 check.dat -rw-rw-rw- 1 root root 0 2020-01-01 00:07 nfs_ready.flag.file QNX: # mount /dev/umass0x20 on /usr/nfs_share/DVR/media/dvr_sdcard0 type dos (fat32) # cat /etc/exports /usr/nfs_share/DVR/ -root=0 193.18.1.201 -Env/Platform QNX: SDP 7.0, QNX NFS Server V3 nfs root -> /usr/nfs_share/DVR, mount TF card(usb) to /usr/nfs_share/DVR/media/dvr_sdcard0, Android can access dvr_sdcard from nfs root. Android: 9.0, Nfs client V3, Kernel 4.14.156 Best Regards Hong Jiu Jin
