Thread (1 message) 1 message, 1 author, 2014-09-24

Re: [PATCH 3/4] Adds project quota support for ext4

From: Jan Kara <hidden>
Date: 2014-09-24 17:31:23
Also in: linux-api, linux-fsdevel

On Wed 24-09-14 22:04:29, Li Xi wrote:
This patch adds mount options for enabling/disabling project quota
accounting and enforcement. A new specific inode is also used for
project quota accounting.
  The patch looks mostly fine. A few smaller things below.

...
quoted hunk
@@ -1433,6 +1437,8 @@ static const struct mount_opts {
 							MOPT_SET | MOPT_Q},
 	{Opt_grpquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_GRPQUOTA,
 							MOPT_SET | MOPT_Q},
+	{Opt_prjquota, EXT4_MOUNT_QUOTA | EXT4_MOUNT_PRJQUOTA,
+							MOPT_SET | MOPT_Q},
 	{Opt_noquota, (EXT4_MOUNT_QUOTA | EXT4_MOUNT_USRQUOTA |
 		       EXT4_MOUNT_GRPQUOTA), MOPT_CLEAR | MOPT_Q},
  I think you missed to add EXT4_MOUNT_PRJQUOTA to Opt_noquota...

...
quoted hunk
@@ -2833,6 +2855,13 @@ static int ext4_feature_set_ok(struct super_block *sb, int readonly)
 			 "without CONFIG_QUOTA");
 		return 0;
 	}
+	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT) &&
+	    !readonly) {
+		ext4_msg(sb, KERN_ERR,
+			 "Filesystem with project quota feature cannot be"
+			 "mounted RDWR without CONFIG_QUOTA");
+		return 0;
+	}
  Hum, I don't think this is right. EXT4_FEATURE_RO_COMPAT_PROJECT is about
maintaining project IDs not about quota. So it seems perfectly OK to have
EXT4_FEATURE_RO_COMPAT_PROJECT without CONFIG_QUOTA.

...
quoted hunk
@@ -5060,6 +5129,8 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
 	ext4_fsblk_t overhead = 0, resv_blocks;
 	u64 fsid;
 	s64 bfree;
+	struct inode *inode = dentry->d_inode;
+	int err = 0;
 	resv_blocks = EXT4_C2B(sbi, atomic64_read(&sbi->s_resv_clusters));
 
 	if (!test_opt(sb, MINIX_DF))
@@ -5084,7 +5155,18 @@ static int ext4_statfs(struct dentry *dentry, struct kstatfs *buf)
 	buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
 	buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
 
-	return 0;
+	if (EXT4_HAS_RO_COMPAT_FEATURE(sb, EXT4_FEATURE_RO_COMPAT_PROJECT) &&
+	    ext4_test_inode_flag(inode, EXT4_INODE_PROJINHERIT) &&
+	    sb_has_quota_usage_enabled(sb, PRJQUOTA) &&
+	    sb_has_quota_limits_enabled(sb, PRJQUOTA)) {
  If limits are enabled, then usage is enabled. So the check for usage
enabled is superfluous...
+	    	err = ext4_statfs_project(sb, EXT4_I(inode)->i_projid, buf);
+	    	if (err) {
+			ext4_warning(sb, "Cannot get quota of project %u\n",
+				     from_kprojid(&init_user_ns,
+						  EXT4_I(inode)->i_projid));
+	    	}
  The warning seems actually bogus - it can happen that project quota
enforcement gets turned off after we check sb_has_quota_limits_enabled()
but before calling dget() in ext4_statfs_project(). So I would just treat
error from ext4_statfs_project() as project quota being disabled...

								Honza
-- 
Jan Kara [off-list ref]
SUSE Labs, CR
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