majianpeng 533bc2950e ceph: fix bugs about handling short-read for sync read mode. ... commit 02ae66d8b229708fd94b764f6c17ead1c7741fcf upstream. cephfs . show_layout >layyout.data_pool: 0 >layout.object_size: 4194304 >layout.stripe_unit: 4194304 >layout.stripe_count: 1 TestA: >dd if=/dev/urandom of=test bs=1M count=2 oflag=direct >dd if=/dev/urandom of=test bs=1M count=2 seek=4 oflag=direct >dd if=test of=/dev/null bs=6M count=1 iflag=direct The messages from func striped_read are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:350 : striped_read 2097152~4194304 (read 2097152) got 0 HITSTRIPE SHORT ceph: file.c:381 : zero tail 4194304 ceph: file.c:390 : striped_read returns 6291456 The hole of file is from 2M--4M.But actualy it zero the last 4M include the last 2M area which isn't a hole. Using this patch, the messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 2097152 HITSTRIPE SHORT ceph: file.c:358 : zero gap 2097152 to 4194304 ceph: file.c:350 : striped_read 4194304~2097152 (read 4194304) got 2097152 ceph: file.c:384 : striped_read returns 6291456 TestB: >echo majianpeng > test >dd if=test of=/dev/null bs=2M count=1 iflag=direct The messages are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:350 : striped_read 11~6291445 (read 11) got 0 HITSTRIPE SHORT ceph: file.c:390 : striped_read returns 11 For this case,it did once more striped_read.It's no meaningless. Using this patch, the message are: ceph: file.c:350 : striped_read 0~6291456 (read 0) got 11 HITSTRIPE SHORT ceph: file.c:384 : striped_read returns 11 Big thanks to Yan Zheng for the patch. Reviewed-by: Yan, Zheng <zheng.z.yan@intel.com> Signed-off-by: Jianpeng Ma <majianpeng@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2014-01-09 12:24:25 -08:00
..
addr.c	ceph: Avoid data inconsistency due to d-cache aliasing in readpage()	2014-01-09 12:24:22 -08:00
caps.c	ceph: take i_mutex before getting Fw cap	2013-05-01 21:18:53 -07:00
ceph_frag.c
debugfs.c
dir.c	ceph: use i_release_count to indicate dir's completeness	2013-05-01 21:17:07 -07:00
export.c	fs: encode_fh: return FILEID_INVALID if invalid fid_type	2013-02-26 02:46:10 -05:00
file.c	ceph: fix bugs about handling short-read for sync read mode.	2014-01-09 12:24:25 -08:00
inode.c	ceph: fix symlink inode operations	2013-05-01 21:18:50 -07:00
ioctl.c	ceph: Add check returned value on func ceph_calc_ceph_pg.	2014-01-09 12:24:25 -08:00
ioctl.h
Kconfig	fs/ceph: remove depends on CONFIG_EXPERIMENTAL	2013-01-11 11:39:04 -08:00
locks.c	ceph: ceph_pagelist_append might sleep while atomic	2013-05-17 12:45:48 -05:00
Makefile
mds_client.c	ceph: fix null pointer dereference	2014-01-09 12:24:25 -08:00
mds_client.h	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client	2013-02-28 17:43:09 -08:00
mdsmap.c	ceph: improve error handling in ceph_mdsmap_decode	2014-01-09 12:24:24 -08:00
snap.c	ceph: use ceph_create_snap_context()	2013-05-01 21:20:09 -07:00
strings.c	libceph: update ceph_mds_state_name() and ceph_mds_op_name()	2013-02-18 12:20:34 -06:00
super.c	ceph: avoid accessing invalid memory	2014-01-09 12:24:25 -08:00
super.h	ceph: ceph_pagelist_append might sleep while atomic	2013-05-17 12:45:48 -05:00
xattr.c	ceph: fix sleeping function called from invalid context.	2013-07-13 11:42:26 -07:00