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user_namespaces.7: Restore historical details about UID maps 

Christian Brauner's patch added the Linux 4.15 details,
but we need to retain the historical details.

Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
This commit is contained in:
Michael Kerrisk 2017-11-19 09:50:41 +01:00
parent dc04b65274
commit 2660d01041
1 changed files with 6 additions and 1 deletions
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7
man7/user_namespaces.7
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@ -511,7 +511,12 @@ and the last field must be greater than 0.
Lines are terminated by newline characters.
.IP *
There is a limit on the number of lines in the file.
As of Linux 4.15, the limit is 340 lines.
In Linux 4.14 and earlier, this limit was (arbitrarily)
.\" 5*12-byte records could fit in a 64B cache line
set at 5 lines.
Since Linux 4.15,
.\" commit 6397fac4915ab3002dc15aae751455da1a852f25
the limit is 340 lines.
In addition, the number of bytes written to
the file must be less than the system page size,
and the write must be performed at the start of the file (i.e.,