On 8/23/24 7:26 AM, Guilherme G. Piccoli wrote:
+ bdev_allow_write_mounted= + Format: <bool> + Control the ability of directly writing to mounted block + devices' page cache, i.e., allow / disallow writes that + bypasses the FS. This was implemented as a means to + prevent fuzzers from crashing the kernel by overwriting + the metadata underneath a mounted FS without its awareness. + This also prevents destructive formatting of mounted + filesystems by naive storage tooling that don't use + O_EXCL. Default is Y and can be changed through the + Kconfig option CONFIG_BLK_DEV_WRITE_MOUNTED. +
Does this flag also affect direct I/O? If so, does this mean that the reference to the page cache should be left out? Thanks, Bart.
