Re: [PATCH v2] statx.2: Document STATX_SUBVOL

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On 20/06/2024 14:00, John Garry wrote:

Hi Alex,

Is there anything else required to get this picked up?

I have some more dependent changes waiting.

Thanks

From: Kent Overstreet <kent.overstreet@xxxxxxxxx>

Document the new statx.stx_subvol field.

This would be clearer if we had a proper API for walking subvolumes that
we could refer to, but that's still coming.

Link: https://lore.kernel.org/linux-fsdevel/20240308022914.196982-1-kent.overstreet@xxxxxxxxx/
Signed-off-by: Kent Overstreet <kent.overstreet@xxxxxxxxx>
[jpg: mention supported FSes and formatting improvements]
Signed-off-by: John Garry <john.g.garry@xxxxxxxxxx>
---
I am just sending a new version as I want to post more statx updates
which are newer than stx_subvol.
diff --git a/man/man2/statx.2 b/man/man2/statx.2
index 0dcf7e20b..5b17d9afe 100644
--- a/man/man2/statx.2
+++ b/man/man2/statx.2
@@ -68,6 +68,8 @@ struct statx {
      /* Direct I/O alignment restrictions */
      __u32 stx_dio_mem_align;
      __u32 stx_dio_offset_align;
+\&
+    __u64 stx_subvol;      /* Subvolume identifier */
  };
  .EE
  .in
@@ -255,6 +257,8 @@ STATX_ALL	The same as STATX_BASIC_STATS | STATX_BTIME.
  STATX_MNT_ID	Want stx_mnt_id (since Linux 5.8)
  STATX_DIOALIGN	Want stx_dio_mem_align and stx_dio_offset_align
  	(since Linux 6.1; support varies by filesystem)
+STATX_SUBVOL	Want stx_subvol
+	(since Linux 6.10; support varies by filesystem)
  .TE
  .in
  .P
@@ -439,6 +443,14 @@ or 0 if direct I/O is not supported on this file.
  This will only be nonzero if
  .I stx_dio_mem_align
  is nonzero, and vice versa.
+.TP
+.I stx_subvol
+Subvolume number of the current file.
+.IP
+Subvolumes are fancy directories,
+i.e. they form a tree structure that may be walked recursively.
+Support varies by filesystem;
+it is supported by bcachefs and btrfs since Linux 6.10.
  .P
  For further information on the above fields, see
  .BR inode (7).





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