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[v12,07/41] btrfs: disallow fitrim in ZONED mode

Message ID 4f14a1ab8ab7b9ed558404c6b3e92ed69d4054f1.1610693037.git.naohiro.aota@wdc.com (mailing list archive)
State New, archived
Headers show
Series btrfs: zoned block device support | expand

Commit Message

Naohiro Aota Jan. 15, 2021, 6:53 a.m. UTC 
The implementation of fitrim is depending on space cache, which is not used
and disabled for zoned btrfs' extent allocator. So the current code does
not work with zoned btrfs. In the future, we can implement fitrim for zoned
btrfs by enabling space cache (but, only for fitrim) or scanning the extent
tree at fitrim time. But, for now, disallow fitrim in ZONED mode.

Signed-off-by: Naohiro Aota <naohiro.aota@wdc.com>
---
 fs/btrfs/ioctl.c | 8 ++++++++
 1 file changed, 8 insertions(+)
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Patch

diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 5b9b0a390f0e..a7980c20c77e 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -527,6 +527,14 @@  static noinline int btrfs_ioctl_fitrim(struct btrfs_fs_info *fs_info,
 	if (!capable(CAP_SYS_ADMIN))
 		return -EPERM;
 
+	/*
+	 * btrfs_trim_block_group() is depending on space cache, which is
+	 * not available in ZONED mode. So, disallow fitrim in ZONED mode
+	 * for now.
+	 */
+	if (btrfs_is_zoned(fs_info))
+		return -EOPNOTSUPP;
+
 	/*
 	 * If the fs is mounted with nologreplay, which requires it to be
 	 * mounted in RO mode as well, we can not allow discard on free space