-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 2/20/12 3:17 PM, Phillip Susi wrote: > On 2/20/2012 11:50 AM, Eric Sandeen wrote: >> fs metadata is mapped into an address space, IIRC, so can't be >> addressed past 2^32 pages. Also, mkfs can't do buffered IO to the >> device past 16T (it is writing to a device _file_) and ditto for >> e2fsck. > > But the file is only used for open(), after that the IO is handled by > the correct device driver, which handles 64 bit offsets ( when you > have CONFIG_LBDAF on ). So if you can change the page cache index > size ( and it doesn't blow up ) this should work fine. Oh, sure - if you change pgoff_t to 64 bits, but until then, you can't even mkfs.ext4 a device larger than 16T; there is nowhere for that buffered IO to go in the page cache, right? (You could mkfs.ext4 a 16T partition on a 40T lun today, thanks to LBDAF, but not a 17T without changing pgoff_t et al) And "if you change the page cache index size" that's a big leap of faith, today. Might be interesting work to do, but I'd bet it's a real chunk of work. - -Eric -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.17 (Darwin) Comment: GPGTools - http://gpgtools.org Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iQIcBAEBAgAGBQJPQs5IAAoJECCuFpLhPd7gFGcP/REp9fxQJEXP/JoV8ixcdPmi Grs15shrEuaJDTnz120wOVS+HSyYU7EczdC1uL6dHFtxqSm/gpdRka5zabz2L46l RWcPjEofLjR45PWJaGzkWQrmrL9tyJdgP83idUUPl9AlGLbK4jgpzgs9OB0tf639 7lf/a711cZT1G7fLg02ZHb88TGE5BltEQHtX1nk1k4srLgjFKRCi5Am+auXgu1ta W0Q3a+oxPlkOiVcr499xmInsAhPHBuErtd7B/S7ViP7Cz+Bhbv25xcM77jwRHmtp 9kwkt2ntQ4v9dccmlqpIMElqQJQGKU1li2ySzmJTUbS8jzmBXG/kXtUEr1y50tNc tm6kIPkMX0RkXRIOfri2jq4LBV0Nl1uGIqUEbUvtJDMh9s4tBtlKV0ZWJi9foIaW OqMAiEhvgb5tpMZG9gjfCSxnMelUAMC9LrygRG04O26Q9vQMEDD57Ee77MOTOZId 1g01fxZzcmd+UXlfDWmHtgSjotSMyp6pV0lWro82qe1pKo7HwwCjIA2KeHu9owTa zmzvzbopd0OoUUmXzqAx2kBdxhhNqoqB2AQXfDf8tmyckA8YY4KMgJhKjFSfMc54 ZDzvWuJI11WoBsia9LlAbcFq0Dchd64Mq6As/By9N6QBWV0LdhkikSTFGTzKL4D2 FrAh6QhIiRhkaGiEI5XG =2bla -----END PGP SIGNATURE----- -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
