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Date: Mon, 15 Oct 2012 12:52:26 +0800 From: Chen Gang <gang.chen@...anux.com> To: "Myklebust, Trond" <Trond.Myklebust@...app.com> CC: Jeff Layton <jlayton@...hat.com>, "linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org> Subject: Re: [Bug fix] nfs-client: fix nfs_inode_attrs_need_update for async read_done comes during truncating to smaller size 于 2012年10月15日 12:27, Myklebust, Trond 写道: > nfs_size_need_update is not about performance. It is a heuristic that is > entirely about ensuring correctness when faced with the fact that most > Linux filesystems are utterly incapable of reporting with modifications > that occur within < 1 second intervals because their mtime/ctime is > limited to 1 second resolutions. > if truly it was for correctness, why not use "!=" instead of '>' ? > Now, what are the conditions of your test setup? The above bug report is > meaningless unless it includes a description of what is being exported > by the server (including a proper listing of the contents > of /etc/exports and /proc/mounts). It should also include a description > of the NFS client mount options (see /proc/mounts on the client). they are below, if you need additional information, please tell me again. for server: (nfsx-linux using rsh auto exportfs in cmd line, not in /etc/exports) -------------------------------------------------------------------- root@...p122:~# exportfs /tmp/fsx18251.testdir <world> /tmp <world> root@...p122:~# root@...p122:~# cat /etc/exports # /etc/exports: the access control list for filesystems which may be exported # to NFS clients. See exports(5). # # Example for NFSv2 and NFSv3: # /srv/homes hostname1(rw,sync,no_subtree_check) hostname2(ro,sync,no_subtree_check) # # Example for NFSv4: # /srv/nfs4 gss/krb5i(rw,sync,fsid=0,crossmnt,no_subtree_check) # /srv/nfs4/homes gss/krb5i(rw,sync,no_subtree_check) # /tmp *(rw,sync,no_root_squash,no_subtree_check) root@...p122:~# root@...p122:~# cat /proc/mounts rootfs / rootfs rw 0 0 sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 udev /dev devtmpfs rw,relatime,size=1229628k,nr_inodes=189901,mode=755 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 tmpfs /run tmpfs rw,nosuid,relatime,size=516280k,mode=755 0 0 /dev/disk/by-uuid/e843c57e-98ce-44cc-8e02-6d8e8d8a01b6 / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0 cgroup /sys/fs/cgroup tmpfs rw,relatime,mode=755 0 0 cgroup /sys/fs/cgroup/cpuset cgroup rw,relatime,cpuset 0 0 cgroup /sys/fs/cgroup/cpu cgroup rw,relatime,cpu 0 0 cgroup /sys/fs/cgroup/cpuacct cgroup rw,relatime,cpuacct 0 0 cgroup /sys/fs/cgroup/devices cgroup rw,relatime,devices 0 0 cgroup /sys/fs/cgroup/freezer cgroup rw,relatime,freezer 0 0 cgroup /sys/fs/cgroup/blkio cgroup rw,relatime,blkio 0 0 cgroup /sys/fs/cgroup/perf_event cgroup rw,relatime,perf_event 0 0 none /sys/fs/fuse/connections fusectl rw,relatime 0 0 none /sys/kernel/debug debugfs rw,relatime 0 0 none /sys/kernel/security securityfs rw,relatime 0 0 none /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0 none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0 rpc_pipefs /run/rpc_pipefs rpc_pipefs rw,relatime 0 0 nfsd /proc/fs/nfsd nfsd rw,relatime 0 0 root@...p122:~# ----------------------------------------------------------------------- for client: ----------------------------------------------------------------------- root@...p159:/opt/ltp/testscripts# cat /proc/mounts rootfs / rootfs rw 0 0 sysfs /sys sysfs rw,nosuid,nodev,noexec,relatime 0 0 proc /proc proc rw,nosuid,nodev,noexec,relatime 0 0 udev /dev devtmpfs rw,relatime,size=1103700k,nr_inodes=190392,mode=755 0 0 devpts /dev/pts devpts rw,nosuid,noexec,relatime,gid=5,mode=620,ptmxmode=000 0 0 tmpfs /run tmpfs rw,nosuid,relatime,size=465908k,mode=755 0 0 /dev/disk/by-uuid/418ec1f1-ed9d-4cae-9336-6c742accf538 / ext4 rw,relatime,errors=remount-ro,data=ordered 0 0 cgroup /sys/fs/cgroup tmpfs rw,relatime,mode=755 0 0 cgroup /sys/fs/cgroup/cpuset cgroup rw,relatime,cpuset 0 0 cgroup /sys/fs/cgroup/cpu cgroup rw,relatime,cpu 0 0 cgroup /sys/fs/cgroup/cpuacct cgroup rw,relatime,cpuacct 0 0 cgroup /sys/fs/cgroup/devices cgroup rw,relatime,devices 0 0 cgroup /sys/fs/cgroup/freezer cgroup rw,relatime,freezer 0 0 cgroup /sys/fs/cgroup/blkio cgroup rw,relatime,blkio 0 0 cgroup /sys/fs/cgroup/perf_event cgroup rw,relatime,perf_event 0 0 none /sys/fs/fuse/connections fusectl rw,relatime 0 0 none /sys/kernel/debug debugfs rw,relatime 0 0 none /sys/kernel/security securityfs rw,relatime 0 0 none /run/lock tmpfs rw,nosuid,nodev,noexec,relatime,size=5120k 0 0 none /run/shm tmpfs rw,nosuid,nodev,relatime 0 0 rpc_pipefs /run/rpc_pipefs rpc_pipefs rw,relatime 0 0 nfsd /proc/fs/nfsd nfsd rw,relatime 0 0 /dev/sda1 /mnt/sda1 ext3 rw,relatime,errors=continue,user_xattr,acl,barrier=1,data=ordered 0 0 dhcp122.asianux.net:/tmp/fsx18251.testdir/ /opt/ltp/testcases/bin/fsx18251 nfs rw,relatime,vers=2,rsize=8192,wsize=8192,namlen=255,hard,proto=udp,timeo=11,retrans=3,sec=sys,mountaddr=10.1.0.139,mountvers=1,mountport=39973,mountproto=udp,local_lock=none,addr=10.1.0.139 0 0 root@...p159:/opt/ltp/testscripts# -- Chen Gang Asianux Corporation -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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