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Full Discussion: /etc/fstab entries
Operating Systems Linux /etc/fstab entries Post 302979942 by RavinderSingh13 on Monday 22nd of August 2016 06:32:36 AM
Old 08-22-2016
Quote:
Originally Posted by muzaffar.k
Hi,
Can anyone explain why we use defaults 0 0 in fstab and what does 0 inidicate
Code:
 
10.250.104.50:/home/u   /home/u         nfs     defaults        0 0

Thanks in advance
Muzaffar
Hello muzaffar.k,

Simple answer is ,second last field(5th field) determines if it should be dumped, last field(6th field) determines if it should be checked during startup and in what sequence. We could get this information from manual entry of fstab as follows.
man fstab:
Quote:
The fifth field, (fs_freq), is used for these filesystems by the dump(8) command to determine which filesystems need to be dumped. If the fifth field is not present, a value of zero is returned and dump will assume that the filesystem does not need to be dumped.

The sixth field, (fs_passno), is used by the fsck(8) program to determine the order in which filesystem checks are done at reboot time. The root filesystem should be specified with a fs_passno of 1, and other filesystems should have a fs_passno of 2. Filesystems within a drive will be checked sequentially, but filesystems on different drives will be checked at the same time to utilize parallelism available in the hardware. If the sixth field is not present or zero, a value of zero is returned and fsck will assume that the filesystem does not need to be checked.
Thanks,
R. Singh
 

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GETFSENT(3)						     Library Functions Manual						       GETFSENT(3)

NAME
getfsent, getfsspec, getfsfile, getfstype, setfsent, endfsent - get file system descriptor file entry SYNOPSIS
#include <fstab.h> struct fstab *getfsent() struct fstab *getfsspec(spec) char *spec; struct fstab *getfsfile(file) char *file; struct fstab *getfstype(type) char *type; int setfsent() int endfsent() DESCRIPTION
Getfsent, getfsspec, getfstype, and getfsfile each return a pointer to an object with the following structure containing the broken-out fields of a line in the file system description file, <fstab.h>. struct fstab { char *fs_spec; char *fs_file; char *fs_type; int fs_freq; int fs_passno; }; The fields have meanings described in fstab(5). Getfsent reads the next line of the file, opening the file if necessary. Setfsent opens and rewinds the file. Endfsent closes the file. Getfsspec and getfsfile sequentially search from the beginning of the file until a matching special file name or file system file name is found, or until EOF is encountered. Getfstype does likewise, matching on the file system type field. FILES
/etc/fstab SEE ALSO
fstab(5) DIAGNOSTICS
Null pointer (0) returned on EOF or error. BUGS
All information is contained in a static area so it must be copied if it is to be saved. 4th Berkeley Distribution May 12, 1986 GETFSENT(3)
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