[PATCH] tmpfs.5: document size/blocks=0 and nr_inodes=0 <=> unlimited

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Bitten by this again. Behaviour blames back to at least 2005
(so probably original to shmem.c), documented upstream in tmpfs.txt.

Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@xxxxxxxxxxxxxxxxxx>
---
 man5/tmpfs.5 | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/man5/tmpfs.5 b/man5/tmpfs.5
index cdd5f2fd8..0e5bc853f 100644
--- a/man5/tmpfs.5
+++ b/man5/tmpfs.5
@@ -51,6 +51,8 @@ .SS Mount options
 .BR size "=\fIbytes\fP"
 Specify an upper limit on the size of the filesystem.
 The size is given in bytes, and rounded up to entire pages.
+The limit is removed if the size is
+.BR 0 .
 .IP
 The size may have a
 .BR k ,
@@ -89,6 +91,8 @@ .SS Mount options
 The maximum number of inodes for this instance.
 The default is half of the number of your physical RAM pages, or (on a
 machine with highmem) the number of lowmem RAM pages, whichever is smaller.
+The limit is removed if the number is
+.BR 0 .
 .IP
 Inodes may be specified with
 .BR k ,
-- 
2.39.2

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