From: Yongqiang Yang Subject: Re: [PATCH v2] xfstests:Make 225 compare map and fiemap at each block. Date: Sun, 22 May 2011 20:38:27 +0800 Message-ID: References: <1305789665-32743-1-git-send-email-xiaoqiangnk@gmail.com> <20110519111205.GI32466@dastard> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: QUOTED-PRINTABLE Cc: josef@redhat.com, sandeen@redhat.com, xfs@oss.sgi.com, linux-ext4@vger.kernel.org To: Dave Chinner Return-path: Received: from mail-vx0-f174.google.com ([209.85.220.174]:58307 "EHLO mail-vx0-f174.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754676Ab1EVMi2 convert rfc822-to-8bit (ORCPT ); Sun, 22 May 2011 08:38:28 -0400 Received: by vxi39 with SMTP id 39so3542404vxi.19 for ; Sun, 22 May 2011 05:38:28 -0700 (PDT) In-Reply-To: <20110519111205.GI32466@dastard> Sender: linux-ext4-owner@vger.kernel.org List-ID: Hi Dave, Thank you for your review. I will resend it. On Thu, May 19, 2011 at 7:12 PM, Dave Chinner wro= te: > On Thu, May 19, 2011 at 03:21:05PM +0800, Yongqiang Yang wrote: >> Due to my carelessness, I induced a ugly patch to ext4's fiemap, but >> 225 could not find it. =A0So I looked into the 225 and could not fig= ure out >> logic in compare_map_and_fiemap(), which seemed to mix extents with >> blocks. =A0Then I made 225 compare map and fiemap at each block, the= new >> 225 can find another bug in ext4 with 1k block. >> >> The new 225 works well on ext3, ext4 and xfs with both 1K and 4K blo= ck. > > The change log could do with some work. What cases did 225 not > cover, what new cases does it cover, what are the impacts of the > change, what bugs were fixed, etc. "I didn't understand the existing > code so I rewrote it" isn't very useful to someone trying to > understand why the changes were made in a couple of years time.... > >> >> Signed-off-by: Yongqiang Yang >> --- >> v1->v2: >> Josef reviewed the v1 patch and pointed out the b= ug which >> made xfs not work and several coding styles. >> >> According to reply from Josef, I >> =A0fixed the bug which added ';' after an if statement. >> =A0removed the trailing whitespace. >> >> Apart from things above, I >> =A0made check_weird_fs_hole() verify bytes read by pread(). >> >> =A0src/fiemap-tester.c | =A0251 ++++++++++++++++++++++++++++--------= --------------- >> =A01 files changed, 140 insertions(+), 111 deletions(-) >> >> diff --git a/src/fiemap-tester.c b/src/fiemap-tester.c >> index 1663f84..319a9bb 100644 >> --- a/src/fiemap-tester.c >> +++ b/src/fiemap-tester.c >> @@ -14,6 +14,9 @@ >> =A0 * You should have received a copy of the GNU General Public Lice= nse >> =A0 * along with this program; if not, write the Free Software Found= ation, >> =A0 * Inc., =A051 Franklin St, Fifth Floor, Boston, MA =A002110-1301= =A0USA >> + * >> + * Compare map and fiemap at each block, >> + * Yongqiang Yang , 2011 >> =A0 */ > > Changelogs belong in the repository commit message, not the code. > >> =A0#include >> @@ -57,7 +60,7 @@ generate_file_mapping(int blocks, int prealloc) >> =A0 =A0 =A0 int num_types =3D 2, cur_block =3D 0; >> =A0 =A0 =A0 int i =3D 0; >> >> - =A0 =A0 map =3D malloc(sizeof(char) * blocks); >> + =A0 =A0 map =3D malloc(sizeof(char) * (blocks + 1)); > > What is the bug this is fixing? Nothing in the change log tells me > why this is being done.... > >> =A0 =A0 =A0 if (!map) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 return NULL; >> >> @@ -81,6 +84,7 @@ generate_file_mapping(int blocks, int prealloc) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 cur_block++; >> =A0 =A0 =A0 } >> >> + =A0 =A0 map[blocks] =3D 0; > > Why is this necessary? If there are any errors, map is printed out as a string. > >> =A0 =A0 =A0 return map; >> =A0} >> >> @@ -247,55 +251,36 @@ check_flags(struct fiemap *fiemap, int blocksi= ze) >> =A0} >> >> =A0static int >> -check_data(struct fiemap *fiemap, __u64 logical_offset, int blocksi= ze, >> +check_data(struct fiemap_extent *extent , =A0__u64 logical_offset, = int blocksize, >> =A0 =A0 =A0 =A0 =A0int last, int prealloc) > > Perhaps adding a comment explaing what the function is actually > checking is in order seeing as you just changed it... > > .... >> @@ -306,7 +291,7 @@ static int >> =A0check_weird_fs_hole(int fd, __u64 logical_offset, int blocksize) >> =A0{ >> =A0 =A0 =A0 static int warning_printed =3D 0; >> - =A0 =A0 int block, i; >> + =A0 =A0 int block, i, count; >> =A0 =A0 =A0 size_t buf_len =3D sizeof(char) * blocksize; >> =A0 =A0 =A0 char *buf; >> >> @@ -330,15 +315,16 @@ check_weird_fs_hole(int fd, __u64 logical_offs= et, int blocksize) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 return -1; >> =A0 =A0 =A0 } >> >> - =A0 =A0 if (pread(fd, buf, buf_len, (off_t)logical_offset) < 0) { >> + =A0 =A0 count =3D pread(fd, buf, buf_len, (off_t)logical_offset); >> + =A0 =A0 if (count < 0) { >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 perror("Error reading from file"); >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 free(buf); >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 return -1; >> =A0 =A0 =A0 } >> >> - =A0 =A0 for (i =3D 0; i < buf_len; i++) { >> + =A0 =A0 for (i =3D 0; i < count; i++) { > > What bug in the test is this fixing? =A0Surely a short read indicates > a filesystem problem? Only checking the bytes returned instead of > the entire hole region will hide the fact that the read didn't cover > the range that was asked for and so we haven't validated the entire > region we were supposed to... I think read operation is verified in other tests, XFS has blocks after the size, so I rely on read bytes. > >> @@ -370,35 +356,25 @@ check_weird_fs_hole(int fd, __u64 logical_offs= et, int blocksize) >> =A0} >> >> =A0static int >> -check_hole(struct fiemap *fiemap, int fd, __u64 logical_offset, int= blocksize) >> +check_hole(struct fiemap_extent *extent, int fd, __u64 logical_offs= et, >> + =A0 =A0 =A0 =A0int blocksize) >> =A0{ > > Same issue with adding a comment explaining what is being > checked.... > >> - =A0 =A0 struct fiemap_extent *extent; >> - =A0 =A0 int c; >> + =A0 =A0 __u64 start, end; >> >> - =A0 =A0 for (c =3D 0; c < fiemap->fm_mapped_extents; c++) { >> - =A0 =A0 =A0 =A0 =A0 =A0 __u64 start, end; >> - =A0 =A0 =A0 =A0 =A0 =A0 extent =3D &fiemap->fm_extents[c]; >> - >> - =A0 =A0 =A0 =A0 =A0 =A0 start =3D extent->fe_logical; >> - =A0 =A0 =A0 =A0 =A0 =A0 end =3D extent->fe_logical + extent->fe_le= ngth; >> - >> - =A0 =A0 =A0 =A0 =A0 =A0 if (logical_offset > end) >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 continue; >> - =A0 =A0 =A0 =A0 =A0 =A0 if (logical_offset + blocksize < start) >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 break; >> + =A0 =A0 start =3D extent->fe_logical; >> + =A0 =A0 end =3D extent->fe_logical + extent->fe_length; >> >> - =A0 =A0 =A0 =A0 =A0 =A0 if (logical_offset >=3D start && >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 logical_offset < end) { >> + =A0 =A0 if (logical_offset >=3D start && >> + =A0 =A0 =A0 =A0 logical_offset < end) { >> >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (check_weird_fs_hole(fd= , logical_offset, >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 blocksize) =3D=3D 0) >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 break; >> + =A0 =A0 =A0 =A0 =A0 =A0 if (check_weird_fs_hole(fd, logical_offset= , >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 blocksize) =3D=3D 0) >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 return 0; > > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0error =3D check_weird_fs_hole(fd, logi= cal_offset, > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 =A0blocksize); > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0if (error =3D=3D 0) > =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0return 0; > >> @@ -423,9 +399,11 @@ compare_fiemap_and_map(int fd, char *map, int b= locks, int blocksize, int syncfil >> =A0{ >> =A0 =A0 =A0 struct fiemap *fiemap; >> =A0 =A0 =A0 char *fiebuf; >> - =A0 =A0 int blocks_to_map, ret, cur_extent =3D 0, last_data; >> + =A0 =A0 int blocks_to_map, ret, last_data =3D -1; >> =A0 =A0 =A0 __u64 map_start, map_length; >> =A0 =A0 =A0 int i, c; >> + =A0 =A0 int cur_block =3D 0; >> + =A0 =A0 int last_found =3D 0; >> >> =A0 =A0 =A0 if (query_fiemap_count(fd, blocks, blocksize) < 0) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 return -1; >> @@ -451,8 +429,11 @@ compare_fiemap_and_map(int fd, char *map, int b= locks, int blocksize, int syncfil >> =A0 =A0 =A0 fiemap->fm_extent_count =3D blocks_to_map; >> =A0 =A0 =A0 fiemap->fm_mapped_extents =3D 0; >> >> + =A0 =A0 /* check fiemap by looking at each block. */ >> =A0 =A0 =A0 do { >> - =A0 =A0 =A0 =A0 =A0 =A0 fiemap->fm_start =3D map_start; >> + =A0 =A0 =A0 =A0 =A0 =A0 int nr_extents; >> + >> + =A0 =A0 =A0 =A0 =A0 =A0 fiemap->fm_start =3D cur_block * blocksize= ; >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 fiemap->fm_length =3D map_length; >> >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 ret =3D ioctl(fd, FS_IOC_FIEMAP, (unsign= ed long)fiemap); >> @@ -465,45 +446,93 @@ compare_fiemap_and_map(int fd, char *map, int = blocks, int blocksize, int syncfil >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (check_flags(fiemap, blocksize)) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 goto error; >> >> - =A0 =A0 =A0 =A0 =A0 =A0 for (i =3D cur_extent, c =3D 1; i < blocks= ; i++, c++) { >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 __u64 logical_offset =3D i= * blocksize; >> - >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (c > fiemap->fm_mapped_= extents) { >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 i++; >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 break; >> + =A0 =A0 =A0 =A0 =A0 =A0 nr_extents =3D fiemap->fm_mapped_extents; >> + =A0 =A0 =A0 =A0 =A0 =A0 if (nr_extents =3D=3D 0) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 int block =3D cur_block + = (map_length - 1) / blocksize; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 for (; cur_block <=3D bloc= k && >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0cur_block <= blocks; cur_block++) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 /* check h= ole */ >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (map[cu= r_block] !=3D 'H') { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 printf("ERROR: map[%d] should not be " >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0"a hole\n", cur_block); >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 goto error; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 continue; >> + =A0 =A0 =A0 =A0 =A0 =A0 } >> >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 switch (map[i]) { >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case 'D': >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (check_= data(fiemap, logical_offset, >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0blocksize, last_data =3D=3D i, 0)) >> + =A0 =A0 =A0 =A0 =A0 =A0 for (c =3D 0; c < nr_extents; c++) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 __u64 offset; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 int block; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 struct fiemap_extent *exte= nt; >> + >> + >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 extent =3D &fiemap->fm_ext= ents[c]; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 offset =3D extent->fe_logi= cal; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 block =3D offset / blocksi= ze; >> + >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 /* check hole. */ >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 for (; cur_block < block &= & cur_block < blocks; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0cur_block++) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (map[cu= r_block] !=3D 'H') { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 printf("ERROR: map[%d] should not be " >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0"a hole\n", cur_block); >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 goto error; >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 break; >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case 'H': >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (check_= hole(fiemap, fd, logical_offset, >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0blocksize)) >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> + >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 offset =3D extent->fe_logi= cal + extent->fe_length; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 block =3D offset / blocksi= ze; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 /* check data */ >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 for (; cur_block < block &= & cur_block < blocks; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0cur_block++) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 int last; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 offset =3D= (__u64)cur_block * blocksize; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 last =3D (= cur_block =3D=3D last_data); >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 last_found= =3D last_found ? last_found : last; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 switch (ma= p[cur_block]) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case 'D': >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 if (check_data(extent, offset, >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0blocksize, last, 0)) >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 goto error; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 break; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case 'H': >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 if (check_hole(extent, fd, offset, >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0blocksize)) >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 goto error; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 break; >> + >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case 'P': >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 if (check_data(extent, offset, >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0blocksize, last, 1)) >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0 goto error; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 break; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 default: >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 printf("ERROR: weird value in " >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0"map: %c\n", map[i]); >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 goto error; >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 break; >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 case 'P': >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (check_= data(fiemap, logical_offset, >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0 =A0 =A0 =A0 =A0blocksize, last_data =3D=3D i, 1)) >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> + >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 for (; cur_block < block; = cur_block++) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 offset =3D= (__u64)cur_block * blocksize; >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (check_= hole(extent, fd, offset, blocksize)) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 = =A0 =A0 goto error; >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 break; >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 default: >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 printf("ER= ROR: weird value in map: %c\n", >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0= =A0map[i]); >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 goto error= ; >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 } >> - =A0 =A0 =A0 =A0 =A0 =A0 cur_extent =3D i; >> - =A0 =A0 =A0 =A0 =A0 =A0 map_start =3D i * blocksize; >> - =A0 =A0 } while (cur_extent < blocks); >> + =A0 =A0 } while (cur_block < blocks); >> >> - =A0 =A0 ret =3D 0; >> - =A0 =A0 return ret; >> + =A0 =A0 if (!last_found && last_data !=3D -1) { >> + =A0 =A0 =A0 =A0 =A0 =A0 printf("ERROR: find no last extent\n"); >> + =A0 =A0 =A0 =A0 =A0 =A0 goto error; >> + =A0 =A0 } >> + >> + =A0 =A0 free(fiebuf); >> + =A0 =A0 return 0; >> =A0error: >> =A0 =A0 =A0 printf("map is '%s'\n", map); >> =A0 =A0 =A0 show_extents(fiemap, blocksize); >> + =A0 =A0 free(fiebuf); >> =A0 =A0 =A0 return -1; >> =A0} > > I can't say I like this - the previous way of iterating the map and > checking that the overlapping fiemap extent is of the correct type > seems much simpler to me. > > Your code now has to special case fiemaps with nr_extents =3D=3D 0, h= as > to handle holes separately both before and after data extents and > adds a bunch of duplicated code. I find it much harder to follow, > and I don't see how rewriting the code like this makes the test > better. Especially as it doesn't tell me what the problems with the > original code were that you've supposedly fixed... I could not figure out logic in old code comparing fiemap and map, I will update the changelog. > >> >> @@ -605,6 +634,18 @@ main(int argc, char **argv) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 printf("Starting infinite run, if you do= n't see any output " >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0"then its working properl= y.\n"); >> =A0 =A0 =A0 do { >> + =A0 =A0 =A0 =A0 =A0 =A0 if (ftruncate(fd, 0)) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 perror("Could not truncate= file\n"); >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 close(fd); >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 exit(1); >> + =A0 =A0 =A0 =A0 =A0 =A0 } >> + >> + =A0 =A0 =A0 =A0 =A0 =A0 if (lseek(fd, 0, SEEK_SET)) { >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 perror("Could not seek set= \n"); >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 close(fd); >> + =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 exit(1); >> + =A0 =A0 =A0 =A0 =A0 =A0 } >> + >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (!map) { >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 blocks =3D random() % ma= xblocks; >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (blocks =3D=3D 0) { >> @@ -639,18 +680,6 @@ main(int argc, char **argv) >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 free(map); >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 map =3D NULL; >> >> - =A0 =A0 =A0 =A0 =A0 =A0 if (ftruncate(fd, 0)) { >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 perror("Could not truncate= file\n"); >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 close(fd); >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 exit(1); >> - =A0 =A0 =A0 =A0 =A0 =A0 } >> - >> - =A0 =A0 =A0 =A0 =A0 =A0 if (lseek(fd, 0, SEEK_SET)) { >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 perror("Could not seek set= \n"); >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 close(fd); >> - =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 exit(1); >> - =A0 =A0 =A0 =A0 =A0 =A0 } >> - >> =A0 =A0 =A0 =A0 =A0 =A0 =A0 if (runs) runs--; >> =A0 =A0 =A0 } while (runs !=3D 0); > > What bug is this fixing? There's Nothing in the changelog.... > > Cheers, > > Dave. > -- > Dave Chinner > david@fromorbit.com > --=20 Best Wishes Yongqiang Yang -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html