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authorAndres Salomon <dilinger@queued.net>2011-10-16 18:15:16 -0700
committerArtem Bityutskiy <artem.bityutskiy@intel.com>2011-10-19 17:22:20 +0300
commit92abc475d8de1c29373f6d96ed63d8ecaa199d25 (patch)
tree44f4d9d04fd04ccee9877e28d8fff5e472bba7d2 /drivers
parent23b1a99b87f3fc9e4242b98b2af3c9bed210f048 (diff)
downloadlinux-92abc475d8de1c29373f6d96ed63d8ecaa199d25.tar.bz2
jffs2: implement mount option parsing and compression overriding
Currently jffs2 has compile-time constants (and .config options) controlling whether or not the various compression/decompression drivers are built in and enabled. This is fine for embedded systems, but it clashes with distribution kernels. Distro kernels tend to turn on everything; this causes OpenFirmware to fall over, as it understands ZLIB-compressed inodes. Booting a kernel that has LZO compression enabled, writing to the boot partition, and then rebooting causes OFW to fail to read the kernel from the filesystem. This is because LZO compression has priority when writing new data to jffs2, if LZO is enabled. This patch adds mount option parsing, and a single supported option ("compr=none"). This adds the flexibility of being able to specify which compressor overrides on a per-superblock basis. For now, we can simply disable compression; additional flexibility coming soon. v2: kill some printks, and implement show_options as suggested by Artem Bityutskiy. Signed-off-by: Andres Salomon <dilinger@queued.net> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@intel.com>
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