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Major and Minor number of Virtual File System

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Operating Systems Solaris Major and Minor number of Virtual File System
# 1  
Old 07-08-2012
Major and Minor number of Virtual File System
Hi friends, Please let me know if there is any way to find out Major and Minor numbers of virtual file system like below:

Code:
/devices                 0K     0K     0K     0%    /devices
ctfs                     0K     0K     0K     0%    /system/contract
proc                     0K     0K     0K     0%    /proc
mnttab                   0K     0K     0K     0%    /etc/mnttab
swap                   661M  1004K   660M     1%    /etc/svc/volatile
objfs                    0K     0K     0K     0%    /system/object
sharefs                  0K     0K     0K     0%    /etc/dfs/sharetab
fd                       0K     0K     0K     0%    /dev/fd
swap                   660M   116K   660M     1%    /tmp
swap                   660M    36K   660M     1%    /var/run

# 2  
Old 07-08-2012
As far as I know major and minor numbers are properties of only device nodes under /devices.
# 3  
Old 07-08-2012
I also think same.. but what are the device numbers mentioned pfiles for the inodes residing in virtual file system?

EX.

Code:
 
pfiles output:

255: S_IFREG mode:0666 dev:297,1 ino:65539 uid:0 gid:0 size:0
      O_RDWR|O_LARGEFILE FD_CLOEXEC
      /system/contract/process/template

bash-3.2# df -h /system/contract/process/template
Filesystem             size   used  avail capacity  Mounted on
ctfs                     0K     0K     0K     0%    /system/contract
bash-3.2#

# 4  
Old 07-08-2012
When stat() is called on any file, it return two device numbers -r.


Code:
dev_t     st_dev;     /* ID of physical device containing file */
dev_t     st_rdev;    /* device ID - think of it as filesystem "device" */

The device id's for st_rdev exist in /etc/mnttab
# 5  
Old 07-09-2012
Thanks jim,

Could you please let me know how to calculate major and minor number from the dev=xxx in mnttab?
# 6  
Old 07-09-2012
You shouldn't try to extrapolate anything from dev=xxx in mnttab:
Using dev=option in applications is strongly discouraged. The device number string represents a 32-bit quantity and might not contain correct information in 64-bit environments.

Applications requiring device number information for mounted file systems should use the getextmntent(3C) interface, which functions properly in either 32- or 64-bit environments.

# 7  
Old 07-09-2012
Quote:
Originally Posted by nitj
I also think same.. but what are the device numbers mentioned pfiles for the inodes residing in virtual file system?

EX.

Code:
 
pfiles output:

255: S_IFREG mode:0666 dev:297,1 ino:65539 uid:0 gid:0 size:0
      O_RDWR|O_LARGEFILE FD_CLOEXEC
      /system/contract/process/template

bash-3.2# df -h /system/contract/process/template
Filesystem             size   used  avail capacity  Mounted on
ctfs                     0K     0K     0K     0%    /system/contract
bash-3.2#

---------- Post updated at 02:07 AM ---------- Previous update was at 02:05 AM ----------

Quote:
Originally Posted by nitj
Hi friends, Please let me know if there is any way to find out Major and Minor numbers of virtual file system like below:

Code:
/devices                 0K     0K     0K     0%    /devices
ctfs                     0K     0K     0K     0%    /system/contract
proc                     0K     0K     0K     0%    /proc
mnttab                   0K     0K     0K     0%    /etc/mnttab
swap                   661M  1004K   660M     1%    /etc/svc/volatile
objfs                    0K     0K     0K     0%    /system/object
sharefs                  0K     0K     0K     0%    /etc/dfs/sharetab
fd                       0K     0K     0K     0%    /dev/fd
swap                   660M   116K   660M     1%    /tmp
swap                   660M    36K   660M     1%    /var/run

Hi,
Minor and major number is only for physical device not for any Virtual device and file.Thanks
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