[stgt] [PATCH 1/1] tgtd: allow 'immutable' files and have them become read-only LUNs.

ronnie sahlberg ronniesahlberg at gmail.com
Sun Oct 10 07:28:29 CEST 2010

List, Tomo

(right list this time:-) )

Please find attached a small patch to the three bs_*.c files used for
SBC and MMC devices.
The patch changes the *_open() function in such way that if the normal
open for O_RDWR fails with EACCES,
we try to open the file with O_RDONLY instead, and set the LUN to read-only.

This allows to set the backing file to "chattr +i" for those
filesystems that support these attributes and automatically
flags them to read-only.

In particular for ISO images I find it very nice to have them set to
immutable to prevent any process from accidentally writing/modifying

ronnie sahlberg
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