On 6/6/14, 10:21 AM, Brian Foster wrote:
> On Thu, Jun 05, 2014 at 02:15:03PM -0500, Eric Sandeen wrote:
>> If we encounter a target that's really a regular file,
>> even without "-d file..." on the cmdline, call
>> platform_findsizes() instead of blkid_get_topology to
>> try to discover the "sector size" via the fsgeom() call.
>>
>> Signed-off-by: Eric Sandeen <sandeen@xxxxxxxxxx>
>> ---
>>
>> V2: Lose local "isa_file" flag, just switch based on
>> (xi->disfile) or (stat works & S_ISREG)
>>
>> diff --git a/mkfs/xfs_mkfs.c b/mkfs/xfs_mkfs.c
>> index 188b6b3..3b8bf67 100644
>> --- a/mkfs/xfs_mkfs.c
>> +++ b/mkfs/xfs_mkfs.c
>> @@ -456,9 +456,25 @@ static void get_topology(
>> struct fs_topology *ft,
>> int force_overwrite)
>> {
>> - if (!xi->disfile) {
>> - const char *dfile = xi->volname ? xi->volname : xi->dname;
>> + struct stat statbuf;
>> + char *dfile = xi->volname ? xi->volname : xi->dname;
>>
>> + /*
>> + * Don't call blkid for topology if this is a "-d file" target, or
>> + * if we've simply been pointed at a regular file. platform_findsizes
>> + * will attempt to find the underlying sector size of the host fs.
>> + */
>> + if (xi->disfile ||
>> + (!stat(dfile, &statbuf) && S_ISREG(statbuf.st_mode))) {
>> + int fd;
>> + long long dummy;
>> +
>> + fd = open(dfile, O_RDONLY);
>> + if (fd >= 0) {
>> + platform_findsizes(dfile, fd, &dummy, &ft->lsectorsize);
>> + close(fd);
>> + }
>
> The patch looks fine:
>
> Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
>
> It does look like we'd still be susceptible to error in a situation
> where the file hasn't been created yet (which would occur in
> libxfs_init()).
Hm, let's see - the only way to have mkfs create the file is with the
-d file,name=foo,size=bar invocation.
Sprinkling some printf's into the if/else above, I see:
# rm -f testfile
# mkfs/mkfs.xfs -dfile,name=testfile,size=1g
** doing platform_findsizes **
meta-data=testfile isize=256 agcount=4, agsize=65536 blks
...
so it looks like the file does get created before we get here.
-Eric
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