Re: [PATCH v2 2/2] statvfs.3: note f_favail = f_ffree on Linux

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Hi!

On 7/5/23 15:57, Tom Schwindl wrote:
On Sat Jun 24, 2023 at 2:39 AM CEST, наб wrote:
Quoting myself from #musl:
01:59:40 hm, I think this was just invented for symmetry with bfree/bavail
02:00:46 FFS has minfree for space but nothing equivalent for inodes
02:32:31 (this is mirrored in ext4;
	  a global grep over DragonFlyBSD and the illumos gate
	  showed just NFSv3 forwarding from the server;
	  OpenBSD always sets it to the same thing as f_ffree;
	  oddly, NetBSD /does/ calculate it differently
	  for LFS and FFS but due to queued writes or
	  w/e not because of root reservation;
	  and as expected a lot of "/* what to put in here? */"
	                       and "// XXX same??")

Link: https://lore.kernel.org/linux-man/f54kudgblgk643u32tb6at4cd3kkzha6hslahv24szs4raroaz@ogivjbfdaqtb/t/#u
Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
---
  man3/statvfs.3 | 8 ++++++++
  1 file changed, 8 insertions(+)

diff --git a/man3/statvfs.3 b/man3/statvfs.3
index b1f0e7545..272ee5391 100644
--- a/man3/statvfs.3
+++ b/man3/statvfs.3
@@ -227,6 +227,14 @@ .SH NOTES
  .BR statvfs ()
  with the argument
  .IR path .
+.PP
+Under Linux,
+.I f_favail
+is always the same as
+.IR f_ffree ,
+and there's no way for a file-system to report otherwise.

s/file-system/filesystem/ as that's what's used elsewhere.

Tom seems to be right.  See man-pages(7):

   Preferred terms
       The  following table lists some preferred terms to use in
       man pages, mainly to ensure consistency across pages.
       Term                 Avoid using              Notes
       ─────────────────────────────────────────────────────────────
       bit mask             bitmask
       built‐in             builtin
       Epoch                epoch                    For the UNIX
                                                     Epoch
                                                     (00:00:00, 1
                                                     Jan 1970 UTC)
       filename             file name
       filesystem           file system
       hostname             host name
       inode                i‐node

Cheers,
Alex


+This is not an issue, since no filesystems with an i-node
+root reservation exist.

s/i-node/inode/ for the same reason.

  .SH STANDARDS
  POSIX.1-2008.
  .SH HISTORY


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