linux-ext4 - [PATCH 1/2] fs: ext4: Consolidate checks for resize of bigalloc into ext4_resize

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Date:   Mon, 7 Jun 2021 12:15:08 -0700
From:   Josh Triplett <josh@...htriplett.org>
To:     linux-ext4@...r.kernel.org, linux-kernel@...r.kernel.org,
        Andreas Dilger <adilger.kernel@...ger.ca>,
        Theodore Ts'o <tytso@....edu>
Subject: [PATCH 1/2] fs: ext4: Consolidate checks for resize of bigalloc into
 ext4_resize_begin

Two different places checked for attempts to resize a filesystem with
the bigalloc feature. Move the check into ext4_resize_begin, which both
places already call.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 fs/ext4/ioctl.c  | 14 --------------
 fs/ext4/resize.c |  5 +++++
 2 files changed, 5 insertions(+), 14 deletions(-)

diff --git a/fs/ext4/ioctl.c b/fs/ext4/ioctl.c
index 31627f7dc5cd..48a7aace337c 100644
--- a/fs/ext4/ioctl.c
+++ b/fs/ext4/ioctl.c
@@ -693,13 +693,6 @@ static long ext4_ioctl_group_add(struct file *file,
 	if (err)
 		return err;
 
-	if (ext4_has_feature_bigalloc(sb)) {
-		ext4_msg(sb, KERN_ERR,
-			 "Online resizing not supported with bigalloc");
-		err = -EOPNOTSUPP;
-		goto group_add_out;
-	}
-
 	err = mnt_want_write_file(file);
 	if (err)
 		goto group_add_out;
@@ -871,13 +864,6 @@ static long __ext4_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
 			goto group_extend_out;
 		}
 
-		if (ext4_has_feature_bigalloc(sb)) {
-			ext4_msg(sb, KERN_ERR,
-				 "Online resizing not supported with bigalloc");
-			err = -EOPNOTSUPP;
-			goto group_extend_out;
-		}
-
 		err = mnt_want_write_file(filp);
 		if (err)
 			goto group_extend_out;
diff --git a/fs/ext4/resize.c b/fs/ext4/resize.c
index bd0d185654f3..d13bb9e76482 100644
--- a/fs/ext4/resize.c
+++ b/fs/ext4/resize.c
@@ -74,6 +74,11 @@ int ext4_resize_begin(struct super_block *sb)
 		return -EPERM;
 	}
 
+	if (ext4_has_feature_bigalloc(sb)) {
+		ext4_msg(sb, KERN_ERR, "Online resizing not supported with bigalloc");
+		return -EOPNOTSUPP;
+	}
+
 	if (test_and_set_bit_lock(EXT4_FLAGS_RESIZING,
 				  &EXT4_SB(sb)->s_ext4_flags))
 		ret = -EBUSY;
-- 
2.32.0.rc2