fsck(1M_S5) (S5) fsck(1M_S5)
NAME
fsck (s5) - check and repair s5 file systems
SYNOPSIS
fsck [-F s5] [generic_options] [special . . .]
fsck -F s5 [generic_options] [-y] [-n] [-p] [-sX] [-SX] [-tfile]
[-l] [-q] [-D] [-f] [special . . .]
DESCRIPTION
generic_options are options supported by the generic fsck
command.
The options are:
-F s5 Specifies the s5-FSType.
-y Assume a yes response to all questions asked by
fsck.
-n Assume a no response to all questions asked by fsck;
do not open the file system for writing.
-p Correct inconsistencies that can be fixed
automatically, that is, inconsistencies that are
deemed harmless and can be fixed without
confirmation by the administrator. Examples of such
inconsistencies are unreferenced i-nodes, incorrect
counts in the superblocks, and missing blocks in the
free list.
-sX Ignore the actual free list and (unconditionally)
reconstruct a new one by rewriting the super-block
of the file system. The file system should be
unmounted while this is done; if this is not
possible, care should be taken that the system is
quiescent and that it is rebooted immediately
afterwards. This precaution is necessary so that
the old, bad, in-core copy of the superblock will
not continue to be used, or written on the file
system.
The -sX suboption allows for creating an optimal
free-list organization.
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fsck(1M_S5) (S5) fsck(1M_S5)
If X is not given, the values used when the file
system was created are used. The format of X is
cylinder size:gap size.
-SX Conditionally reconstruct the free list. This
suboption is like -sX above except that the free
list is rebuilt only if there were no discrepancies
discovered in the file system. Using S will force a
no response to all questions asked by fsck. This
suboption is useful for forcing free list
reorganization on uncontaminated file systems.
-tfile If fsck cannot obtain enough memory to keep its
tables, it uses a scratch file. If the t option is
specified, the file named is used as the scratch
file, if needed. Without the t option, fsck will
prompt the user for the name of the scratch file.
The file chosen should not be on the file system
being checked, and if it is not a special file or
did not already exist, it is removed when fsck
completes.
-l Identify damaged files by their logical names.
-q Quiet fsck. Unreferenced fifos will silently be
removed. If fsck requires it, counts in the
superblock will be automatically fixed and the free
list salvaged.
-D Directories are checked for bad blocks. Useful
after system crashes.
-f Fast check. Check block and sizes and check the
free list. The free list will be reconstructed if
it is necessary.
Inconsistencies checked are as follows:
Blocks claimed by more than one i-node or the free list.
Blocks claimed by an i-node or the free list outside the
range of the file system.
Incorrect link counts.
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fsck(1M_S5) (S5) fsck(1M_S5)
Size checks:
Incorrect number of blocks.
Directory size not 16-byte aligned.
Bad i-node format.
Blocks not accounted for anywhere.
Directory checks:
File pointing to unallocated i-node.
I-node number out of range.
Super Block checks:
More than 65536 i-nodes.
More blocks for i-nodes than there are in the file
system.
Bad free block list format.
Total free block and/or free i-node count incorrect.
Orphaned files and directories (allocated but unreferenced)
are, with the user's concurrence, reconnected by placing them
in the lost+found directory, if the files are nonempty. The
user will be notified if the file or directory is empty or
not. Empty files or directories are removed, as long as the n
suboption is not specified. fsck will force the reconnection
of nonempty directories. The name assigned is the i-node
number.
NOTE
Checking the raw device is almost always faster.
I-node numbers for . and .. in each directory are not checked
for validity.
When fsck detects an incorrect file size, it prompts you to
choose whether you want the file truncated or expanded to
match the number of blocks allocated. Increasing the file
size may produce unwanted data at the end of your file;
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fsck(1M_S5) (S5) fsck(1M_S5)
truncating the file may destroy data in the last few blocks.
REFERENCES
crash(1M), s5-specific version of fs(4S5), generic fsck(1M),
mkfs(1M), ncheck(1M)
Copyright 1994 Novell, Inc. Page 4