On Wed, Jan 11, 2012 at 11:11:56AM -0800, Aditya Kali wrote: > This patch is an attempt towards supporting quotas as first class > feature in ext4. It is based on the proposal at: > https://ext4.wiki.kernel.org/index.php/Design_For_1st_Class_Quota_in_Ext4 > This patch introduces a new feature - EXT4_FEATURE_RO_COMPAT_QUOTA which, when > turned on, enables quota accounting at mount time iteself. Also, the > quota inodes are stored in two additional superblock fields. > Some changes introduced by this patch that should be pointed out are: > 1) Two new ext4-superblock fields - s_usr_quota_inum and s_grp_quota_inum > for storing the quota inodes in use. > 2) Default quota inodes are: inode#3 for tracking userquota and inode#4 for > tracking group quota. The superblock fields can be set to use other inodes > as well. > 3) If the QUOTA feature and corresponding quota inodes are set in superblock, > the quota usage tracking is turned on at mount time. On 'quotaon' ioctl, the > quota limits enforcement is turned on. 'quotaoff' ioctl turns off only the > limits enforcement in this case. > 4) When QUOTA feature is in use, the quota mount options 'quota', 'usrquota', > 'grpquota' are ignored by the kernel. > 5) mke2fs or tune2fs can be used to set the QUOTA feature and initialize quota > inodes. The default reserved inodes will not be visible to user as > regular files. > 6) The quota-tools will need to be modified to support hidden quota files on > ext4. E2fsprogs will also include support for creating and fixing quota > files. > 7) Support is only for the new V2 quota file format. > > Signed-off-by: Aditya Kali <adityakali@xxxxxxxxxx> Looks good to me. Reviewed-by: Johann Lombardi <johann@xxxxxxxxxxxxx> Johann -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
