2.6.9-rc2-mm4 stat -f sickness

2.6.9-rc2-mm4 stat -f sickness

[Jeff V. Merkey]

In 2.6.9-rc2-mm4 the command "stat -f /dev/<device>" always returns
EXT2_SUPER_MAGIC and other bogus information even if other filesystems
are mounted on the device.  

Trace info attached.   Reported mount info, strace info, and stat -f
info included.

mount info

/dev/hda3 on / type ext3 (rw)
none on /proc type proc (rw)
none on /sys type sysfs (rw)
none on /dev/pts type devpts (rw,gid=5,mode=620)
usbdevfs on /proc/bus/usb type usbdevfs (rw)
/dev/hda1 on /boot type ext3 (rw)
none on /dev/shm type tmpfs (rw)
/dev/sda1 on /pfs type dsfs (rw)
/dev/sda2 on /storage type dsfs (rw)

df -h (df says .....)

Filesystem            Size  Used Avail Use% Mounted on
/dev/hda3             9.7G  7.2G  2.0G  79% /
/dev/hda1             190M  9.5M  171M   6% /boot
none                  1.5G     0  1.5G   0% /dev/shm
/dev/sda1             936G  936G     0 100% /pfs
/dev/sda2             936G  936G     0 100% /storage

stat -f /dev/sda1 (bogus info)
 
  File: "/dev/sda1"
    ID: 0        Namelen: 255     Type: ext2/ext3
Blocks: Total: 2520130    Free: 651513     Available: 523496     Size: 4096
Inodes: Total: 1281696    Free: 878949    

strace of stat -f /dev/sda1 (bogus info)

execve("/usr/bin/stat", ["stat", "-f", "/dev/sda1"], [/* 26 vars */]) = 0
uname({sys="Linux", node="datascout4", ...}) = 0
brk(0)                                  = 0x8052000
open("/etc/ld.so.preload", O_RDONLY)    = -1 ENOENT (No such file or directory)
open("/etc/ld.so.cache", O_RDONLY)      = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=123802, ...}) = 0
old_mmap(NULL, 123802, PROT_READ, MAP_PRIVATE, 3, 0) = 0x37fcc000
close(3)                                = 0
open("/lib/libselinux.so.1", O_RDONLY)  = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\350\261"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=60776, ...}) = 0
old_mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x37fcb000
old_mmap(0x47898000, 64532, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x37fbb000
old_mmap(0x37fc9000, 8192, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0xd000) = 0x37fc9000
close(3)                                = 0
open("/lib/tls/libc.so.6", O_RDONLY)    = 3
read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\300\v\327"..., 512) = 512
fstat64(3, {st_mode=S_IFREG|0755, st_size=1455084, ...}) = 0
old_mmap(0x46d5c000, 1158124, PROT_READ|PROT_EXEC, MAP_PRIVATE, 3, 0) = 0x37ea0000
old_mmap(0x37fb5000, 16384, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED, 3, 0x115000) = 0x37fb5000
old_mmap(0x37fb9000, 7148, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_FIXED|MAP_ANONYMOUS, -1, 0) = 0x37fb9000
close(3)                                = 0
mprotect(0x37fb5000, 8192, PROT_READ)   = 0
mprotect(0x38000000, 4096, PROT_READ)   = 0
set_thread_area({entry_number:-1 -> 6, base_addr:0x37fcbae0, limit:1048575, seg_32bit:1, contents:0, read_exec_only:0, limit_in_pages:1, seg_not_present:0, useable:1}) = 0
munmap(0x37fcc000, 123802)              = 0
brk(0)                                  = 0x8052000
brk(0x8073000)                          = 0x8073000
open("/proc/mounts", O_RDONLY)          = 3
fstat64(3, {st_mode=S_IFREG|0444, st_size=0, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x37fea000
read(3, "rootfs / rootfs rw 0 0\n/dev/root"..., 1024) = 285
read(3, "", 1024)                       = 0
close(3)                                = 0
munmap(0x37fea000, 4096)                = 0
open("/usr/lib/locale/locale-archive", O_RDONLY|O_LARGEFILE) = 3
fstat64(3, {st_mode=S_IFREG|0644, st_size=40263984, ...}) = 0
mmap2(NULL, 2097152, PROT_READ, MAP_PRIVATE, 3, 0) = 0x37ca0000
close(3)                                = 0
statfs64("/dev/sda1", 84, {f_type="EXT2_SUPER_MAGIC", f_bsize=4096, f_blocks=2520130, f_bfree=651513, f_bavail=523496, f_files=1281696, f_ffree=878950, f_fsid={0, 0}, f_namelen=255, f_frsize=4096}) = 0
fstat64(1, {st_mode=S_IFREG|0644, st_size=2718, ...}) = 0
mmap2(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x37c9f000
write(1, "  File: \"/dev/sda1\"\n    ID: 0   "..., 189  File: "/dev/sda1"
    ID: 0        Namelen: 255     Type: ext2/ext3
Blocks: Total: 2520130    Free: 651513     Available: 523496     Size: 4096
Inodes: Total: 1281696    Free: 878950    
) = 189
close(1)                                = 0
munmap(0x37c9f000, 4096)                = 0
exit_group(0)                           = ?


Get the can of RAID.  Monster bugs.



Jeff

Re: 2.6.9-rc2-mm4 stat -f sickness

[Russell King]

On Mon, Oct 04, 2004 at 02:46:39PM -0600, Jeff V. Merkey wrote:
> In 2.6.9-rc2-mm4 the command "stat -f /dev/<device>" always returns
> EXT2_SUPER_MAGIC and other bogus information even if other filesystems
> are mounted on the device.  

Please read the statfs manpage carefully.  You will find that statfs
does not report the filesystem type found inside the "path" you asked
for, but the filesystem type _containing_ the path.

-- 
Russell King
 Linux kernel    2.6 ARM Linux   - http://www.arm.linux.org.uk/
 maintainer of:  2.6 PCMCIA      - http://pcmcia.arm.linux.org.uk/
                 2.6 Serial core