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| author | Lukas Czerner <lczerner@redhat.com> | 2023-07-25 16:45:09 +0200 |
|---|---|---|
| committer | Christian Brauner <brauner@kernel.org> | 2023-08-09 09:15:40 +0200 |
| commit | de4c0e7ca8b526a82ff7e5ee5533787bb6d01724 (patch) | |
| tree | 3becafa0f5ce6e50ff6a35703c961236c22630b3 /Documentation/filesystems | |
| parent | e09764cff44b5d31c2ca5477444565e3080637d2 (diff) | |
| download | lwn-de4c0e7ca8b526a82ff7e5ee5533787bb6d01724.tar.gz lwn-de4c0e7ca8b526a82ff7e5ee5533787bb6d01724.zip | |
shmem: Add default quota limit mount options
Allow system administrator to set default global quota limits at tmpfs
mount time.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Message-Id: <20230725144510.253763-7-cem@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to 'Documentation/filesystems')
| -rw-r--r-- | Documentation/filesystems/tmpfs.rst | 34 |
1 files changed, 25 insertions, 9 deletions
diff --git a/Documentation/filesystems/tmpfs.rst b/Documentation/filesystems/tmpfs.rst index 06d6195eaa2c..67422ee10e03 100644 --- a/Documentation/filesystems/tmpfs.rst +++ b/Documentation/filesystems/tmpfs.rst @@ -125,15 +125,31 @@ force huge pages on all tmpfs mounts for testing. tmpfs also supports quota with the following mount options -======== ============================================================= -quota User and group quota accounting and enforcement is enabled on - the mount. Tmpfs is using hidden system quota files that are - initialized on mount. -usrquota User quota accounting and enforcement is enabled on the - mount. -grpquota Group quota accounting and enforcement is enabled on the - mount. -======== ============================================================= +======================== ================================================= +quota User and group quota accounting and enforcement + is enabled on the mount. Tmpfs is using hidden + system quota files that are initialized on mount. +usrquota User quota accounting and enforcement is enabled + on the mount. +grpquota Group quota accounting and enforcement is enabled + on the mount. +usrquota_block_hardlimit Set global user quota block hard limit. +usrquota_inode_hardlimit Set global user quota inode hard limit. +grpquota_block_hardlimit Set global group quota block hard limit. +grpquota_inode_hardlimit Set global group quota inode hard limit. +======================== ================================================= + +None of the quota related mount options can be set or changed on remount. + +Quota limit parameters accept a suffix k, m or g for kilo, mega and giga +and can't be changed on remount. Default global quota limits are taking +effect for any and all user/group/project except root the first time the +quota entry for user/group/project id is being accessed - typically the +first time an inode with a particular id ownership is being created after +the mount. In other words, instead of the limits being initialized to zero, +they are initialized with the particular value provided with these mount +options. The limits can be changed for any user/group id at any time as they +normally can be. Note that tmpfs quotas do not support user namespaces so no uid/gid translation is done if quotas are enabled inside user namespaces. |