quotacheck - scan a filesystem for disk usages
quotacheck [g] [u] [v] a
quotacheck [g] [u] [v] filesys ...
Quotacheck performs a filesystems scan for usage of files and directories, used by either user or group. XFS filesystems are ignored by quotacheck, since the XFS quota system is journalled and therefore inherently consistent.
The output is the quota file for the corresponding filesystem. By default the names for these files are:
- A user scan: quota.user
- A group scan: quota.group
The resulting file consists of a struct dqblk for each possible id up to the highest existing uid or gid and contains the values for the disk file and block usage and possibly excess time for these values. ( for definitions of struct dqblk see <linux/quota.h> )
Quotacheck should be run each time the system boots and mounts nonvalid filesystems. This is most likely to happen after a system crash.
The speed of the scan decreases with the number of directories increasing. The time needed doubles when disk usage is doubled as well. A 100 MB partition used for 94% is scanned in 1 minute, the same partition used for 50% is done in 25 seconds.
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-v |
This way the program will give some useful information about what it is doing, plus some fancy stuff. |
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-d |
This means debug. It will result in a lot of information which can be used in debugging the program. The output is very verbose and the scan will not be fast. |
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-u |
This flag tells the program to scan the disk and to count the files and directories used by a certain uid. This is the default action. |
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-g |
This flag forces the program to count the files and directories used by a certain gid. |
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-a |
Check all of the quotas for the filesystems mentioned in /etc/fstab. Both user and group quotas are checked as indicated by the /etc/fstab options. |
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-R |
When used in conjunction with -a, all filesystems except the root filesystem are checked for quotas. |
Quotacheck should only be run as Super User. Nonprivilidged users are presumably not allowed to read all the directories on the given filesystem.
quota(1), quotactl(2), fstab(5), quotaon(8), quotaoff(8), edquota(8), repquota(8), fsck(8)
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quota file at the filesystem root |
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/etc/fstab |
Edvard Tuinder <ed@elm.net>
Marco van Wieringen <mvw@planets.elm.net>