fsck_udfs - file system consistency check and interactive repair
fsck -F udfs [generic_options] [special ...]
fsck -F udfs [generic_options] [-o specific_options]
fsck audits and interactively repairs inconsistent conditions on file
systems. A file system to be checked can be specified by giving the name of
the block or character special device or by giving the name of its mount point
if a matching entry exists in /etc/vfstab.
special represents the character special device, for
example, /dev/rdsk/c0t2d0s0, on which the file system resides. The
character special device, not the block special device should be used.
fsck does not work on a mounted block device.
If no special device is specified, all udfs file systems
specified in the vfstab file with a fsckdev entry are checked.
If the -p (preen) option is specified, udfs file
systems with an fsckpass number greater than 1 are checked in
parallel. See fsck(8).
In the case of correcting serious inconsistencies, by default,
fsck asks for confirmation before making a repair and waits for the
operator to respond with either yes or no. If the operator
does not have write permission on the file system, fsck defaults to
the -n (no corrections) option. See fsck(8).
Repairing some file system inconsistencies can result in loss of
data. The amount and severity of data loss can be determined from the
fsck automatically corrects innocuous inconsistencies. It
displays a message for each corrected inconsistency that identifies the
nature of the correction which took place on the file system. After
successfully correcting a file system, fsck prints the number of
files on that file system and the number of used and free blocks.
Inconsistencies checked are as follows:
- Blocks claimed by more than one file or the free list
- Blocks claimed by a file or the free list outside the range of the file
- Incorrect link counts in file entries
- Incorrect directory sizes
- Blocks not accounted for anywhere
- Directory checks, file pointing to unallocated file entry and absence of a
parent directory entry
- Descriptor checks, more blocks for files than there are in the file
- Bad free block list format
The following options are supported:
- Total free block count incorrect
The following generic_options
Check but do not repair. This option checks to be sure
that the file system is suitable for mounting, and returns the appropriate
exit status. If the file system is ready for mounting, fsck
message such as:
udfs fsck: sanity check: /dev/rdsk/c0t2d0s0 okay
-n | -N
Assume a no response to all questions asked by
fsck; do not open the file system for writing.
Echo the expanded command line, but do not execute the
command. This option can be used to verify and to validate the command
-y | -Y
Assume a yes response to all questions asked by
file system specific options in a
comma-separated list with no intervening spaces. The following
Force checking of file systems regardless of the state of
their logical volume integrity state.
Check and fix the file system non-interactively
(preen). Exit immediately if there is a problem that requires
intervention. This option is required to enable parallel file system
Check writable file systems only.
List of default parameters for each file system.
The operating system buffers file system data. Running fsck on a mounted
file system can cause the operating system's buffers to become out of date
with respect to the disk. For this reason, use fsck only when the file
system is unmounted. If this is not possible, take care that the system is
quiescent and that it is rebooted immediately after running fsck. A
panic will probably occur if running fsck on a file system that
modifies the file system while it is mounted.
If an unmount of the file system is not done before the system is
shut down, the file system might become corrupted. In this case, a file
system check needs to be completed before the next mount operation.
You cannot write to the device.
Currently Mounted on
The device is already mounted and cannot run
FILE SYSTEM WAS MODIFIED
File system has been modified to bring it to a consistent
Can't read allocation extent
Cannot read the block containing allocation extent.
Bad tag on alloc extent
Invalid tag detected when expecting an allocation
Volume sequence tag error
Invalid tag detected in the volume sequence.
Space bitmap tag error
Invalid tag detected in the space bitmap.
UNEXPECTED INCONSISTENCY; RUN fsck MANUALLY
Use fsck in interactive mode.