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From: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
To: Jonathan Corbet <corbet@lwn.net>,
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Subject: [PATCH v3 03/13] fs: fiemap: add new COMPRESSED extent state
Date: Wed,  3 Apr 2024 03:22:44 -0400
Message-ID: <2befe2c13065bdf3ca74cb8b701727940310fd2a.1712126039.git.sweettea-kernel@dorminy.me>
In-Reply-To: <cover.1712126039.git.sweettea-kernel@dorminy.me>
References: <cover.1712126039.git.sweettea-kernel@dorminy.me>
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This goes closely with the new physical length field in struct
fiemap_extent, as when physical length is not equal to logical length
the reason is frequently compression.

Signed-off-by: Sweet Tea Dorminy <sweettea-kernel@dorminy.me>
---
 Documentation/filesystems/fiemap.rst | 4 ++++
 fs/ioctl.c                           | 3 ++-
 include/uapi/linux/fiemap.h          | 2 ++
 3 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/Documentation/filesystems/fiemap.rst b/Documentation/filesystems/fiemap.rst
index c060bb83f5d8..16bd7faba5e0 100644
--- a/Documentation/filesystems/fiemap.rst
+++ b/Documentation/filesystems/fiemap.rst
@@ -162,6 +162,10 @@ FIEMAP_EXTENT_DATA_ENCRYPTED
   This will also set FIEMAP_EXTENT_ENCODED
   The data in this extent has been encrypted by the file system.
 
+FIEMAP_EXTENT_DATA_COMPRESSED
+  This will also set FIEMAP_EXTENT_ENCODED
+  The data in this extent is compressed by the file system.
+
 FIEMAP_EXTENT_NOT_ALIGNED
   Extent offsets and length are not guaranteed to be block aligned.
 
diff --git a/fs/ioctl.c b/fs/ioctl.c
index 1830baca532b..b47e2da7ec17 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -126,7 +126,8 @@ int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
 		return 1;
 
 #define SET_UNKNOWN_FLAGS	(FIEMAP_EXTENT_DELALLOC)
-#define SET_NO_UNMOUNTED_IO_FLAGS	(FIEMAP_EXTENT_DATA_ENCRYPTED)
+#define SET_NO_UNMOUNTED_IO_FLAGS	(FIEMAP_EXTENT_DATA_ENCRYPTED|\
+					 FIEMAP_EXTENT_DATA_COMPRESSED)
 #define SET_NOT_ALIGNED_FLAGS	(FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
 
 	if (flags & SET_UNKNOWN_FLAGS)
diff --git a/include/uapi/linux/fiemap.h b/include/uapi/linux/fiemap.h
index 3079159b8e94..ea97e33ddbb3 100644
--- a/include/uapi/linux/fiemap.h
+++ b/include/uapi/linux/fiemap.h
@@ -67,6 +67,8 @@ struct fiemap {
 						    * Sets EXTENT_UNKNOWN. */
 #define FIEMAP_EXTENT_ENCODED		0x00000008 /* Data can not be read
 						    * while fs is unmounted */
+#define FIEMAP_EXTENT_DATA_COMPRESSED	0x00000040 /* Data is compressed by fs.
+						    * Sets EXTENT_ENCODED. */
 #define FIEMAP_EXTENT_DATA_ENCRYPTED	0x00000080 /* Data is encrypted by fs.
 						    * Sets EXTENT_NO_BYPASS. */
 #define FIEMAP_EXTENT_NOT_ALIGNED	0x00000100 /* Extent offsets may not be
-- 
2.43.0