diff options
| author | Kinglong Mee <kinglongmee@gmail.com> | 2015-10-16 17:23:29 +0800 |
|---|---|---|
| committer | Trond Myklebust <trond.myklebust@primarydata.com> | 2015-10-21 15:55:47 -0500 |
| commit | f8417b481cce2bed4744fda733f2ff22278bd7ce (patch) | |
| tree | 95d9a47576a5adb0c05b63215d3ca1b417d1714f /fs/nfs/read.c | |
| parent | 15ae2c7bdc9a5a46999319b88a465a64d265dc40 (diff) | |
| download | linux-f8417b481cce2bed4744fda733f2ff22278bd7ce.tar.gz | |
NFSv4.1/pnfs: Retry through MDS when getting bad length of data
If non rpc-based layout driver return bad length of data, nfs retries
by calling rpc_restart_call_prepare() that cause an NULL reference panic.
This patch lets nfs retry through MDS for non rpc-based layout driver
return bad length of data.
[13034.883329] BUG: unable to handle kernel NULL pointer dereference at (null)
[13034.884902] IP: [<ffffffffa00db372>] rpc_restart_call_prepare+0x62/0x90 [sunrpc]
[13034.886558] PGD 0
[13034.888126] Oops: 0000 [#1] KASAN
[13034.889710] Modules linked in: blocklayoutdriver(OE) nfsv4(OE) nfs(OE) fscache(E) nfsd(OE) xfs libcrc32c coretemp btrfs crct10dif_pclmul crc32_pclmul crc32c_intel ghash_clmulni_intel ppdev vmw_balloon auth_rpcgss shpchp nfs_acl lockd vmw_vmci parport_pc xor raid6_pq grace parport sunrpc i2c_piix4 vmwgfx drm_kms_helper ttm drm mptspi e1000 serio_raw scsi_transport_spi mptscsih mptbase ata_generic pata_acpi [last unloaded: fscache]
[13034.898260] CPU: 0 PID: 10112 Comm: kworker/0:1 Tainted: G OE 4.3.0-rc5+ #279
[13034.899932] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 07/02/2015
[13034.903342] Workqueue: events bl_read_cleanup [blocklayoutdriver]
[13034.905059] task: ffff88006a9148c0 ti: ffff880035e90000 task.ti: ffff880035e90000
[13034.906827] RIP: 0010:[<ffffffffa00db372>] [<ffffffffa00db372>] rpc_restart_call_prepare+0x62/0x90 [sunrpc]
[13034.910522] RSP: 0018:ffff880035e97b58 EFLAGS: 00010282
[13034.912378] RAX: fffffbfff04a5a94 RBX: ffff880068fe4858 RCX: 0000000000000003
[13034.914339] RDX: dffffc0000000000 RSI: 0000000000000003 RDI: 0000000000000282
[13034.916236] RBP: ffff880035e97b68 R08: 0000000000000001 R09: 0000000000000001
[13034.918229] R10: 0000000000000000 R11: 0000000000000001 R12: 0000000000000000
[13034.920007] R13: ffff880068fe4858 R14: ffff880068fe4a60 R15: 0000000000001000
[13034.921845] FS: 0000000000000000(0000) GS:ffffffff82247000(0000) knlGS:0000000000000000
[13034.923645] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[13034.925525] CR2: 0000000000000000 CR3: 00000000063dd000 CR4: 00000000001406f0
[13034.932808] Stack:
[13034.934813] ffff880068fe4780 0000000000001000 ffff880035e97ba8 ffffffffa08800d2
[13034.936675] ffffffffa088029d ffff880068fe4780 ffff880068fe4858 ffffffffa089c0a0
[13034.938593] ffff880068fe47e0 ffff88005d59faf0 ffff880035e97be0 ffffffffa087e08f
[13034.940454] Call Trace:
[13034.942388] [<ffffffffa08800d2>] nfs_readpage_result+0x112/0x200 [nfs]
[13034.944317] [<ffffffffa088029d>] ? nfs_readpage_done+0xdd/0x160 [nfs]
[13034.946267] [<ffffffffa087e08f>] nfs_pgio_result+0x9f/0x120 [nfs]
[13034.948166] [<ffffffffa09266cc>] pnfs_ld_read_done+0x7c/0x1e0 [nfsv4]
[13034.950247] [<ffffffffa03b07ee>] bl_read_cleanup+0x2e/0x60 [blocklayoutdriver]
[13034.952156] [<ffffffff810ebf62>] process_one_work+0x412/0x870
[13034.954102] [<ffffffff810ebe84>] ? process_one_work+0x334/0x870
[13034.955949] [<ffffffff810ebb50>] ? queue_delayed_work_on+0x40/0x40
[13034.957985] [<ffffffff810ec441>] worker_thread+0x81/0x6a0
[13034.959817] [<ffffffff810ec3c0>] ? process_one_work+0x870/0x870
[13034.961785] [<ffffffff810f43bd>] kthread+0x17d/0x1a0
[13034.963544] [<ffffffff810f4240>] ? kthread_create_on_node+0x330/0x330
[13034.965479] [<ffffffff81100428>] ? finish_task_switch+0x88/0x220
[13034.967223] [<ffffffff810f4240>] ? kthread_create_on_node+0x330/0x330
[13034.968929] [<ffffffff81b6ae5f>] ret_from_fork+0x3f/0x70
[13034.970534] [<ffffffff810f4240>] ? kthread_create_on_node+0x330/0x330
[13034.972176] Code: c7 43 50 40 84 0d a0 e8 3d fe 1c e1 48 8d 7b 58 c7 83 e4 00 00 00 00 00 00 00 e8 ca fe 1c e1 4c 8b 63 58 4c 89 e7 e8 be fe 1c e1 <49> 83 3c 24 00 74 12 48 c7 43 50 f0 a2 0e a0 b8 01 00 00 00 5b
[13034.977148] RIP [<ffffffffa00db372>] rpc_restart_call_prepare+0x62/0x90 [sunrpc]
[13034.978780] RSP <ffff880035e97b58>
[13034.980399] CR2: 0000000000000000
Signed-off-by: Kinglong Mee <kinglongmee@gmail.com>
Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Diffstat (limited to 'fs/nfs/read.c')
| -rw-r--r-- | fs/nfs/read.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/fs/nfs/read.c b/fs/nfs/read.c index 01b8cc8e8cfc43..0a5e33f33b5c83 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -246,6 +246,13 @@ static void nfs_readpage_retry(struct rpc_task *task, nfs_set_pgio_error(hdr, -EIO, argp->offset); return; } + + /* For non rpc-based layout drivers, retry-through-MDS */ + if (!task->tk_ops) { + hdr->pnfs_error = -EAGAIN; + return; + } + /* Yes, so retry the read at the end of the hdr */ hdr->mds_offset += resp->count; argp->offset += resp->count; @@ -268,7 +275,7 @@ static void nfs_readpage_result(struct rpc_task *task, hdr->good_bytes = bound - hdr->io_start; } spin_unlock(&hdr->lock); - } else if (hdr->res.count != hdr->args.count) + } else if (hdr->res.count < hdr->args.count) nfs_readpage_retry(task, hdr); } |