Bitten by this again. Behaviour blames back to at least 2005 (probably original to shmem.c), documented upstream in Documentation/filesystems/tmpfs.rst (formerly .txt). For example: # mount -t tmpfs -o size=0 tmpfs /etc/ # df /etc/ Filesystem 1k-blocks Used Avail Use% Mounted on tmpfs 0 0 0 - /etc # head -c100M < /dev/urandom > /etc/passwd # df /etc/ Filesystem 1k-blocks Used Avail Use% Mounted on tmpfs 0 0 0 - /etc # ls -l /etc/passwd -rw-r--r-- 1 0 0 104857600 08-12 19:55 /etc/passwd # du /etc/passwd 204800 /etc/passwd whereas the current manual insinuates head should ENOSPC instantly. 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..5274e632d 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
Attachment:
signature.asc
Description: PGP signature
