Searching for Jffs2 Mmap Support information? Find all needed info by using official links provided below.
https://stackoverflow.com/questions/6030002/o-direct-support-on-a-jffs2-linux-filesystem
jffs2 does not support O_DIRECT. You can see in __dentry_open() that in order to support O_DIRECT, a filesystem must supply the direct_IO and/or get_xip_mem members of the address_space_operations struct. You can likewise see that jffs2 does not supply these members. It is not clear why you are so keen to avoid the page cache.
http://processors.wiki.ti.com/index.php/AM335x_JFFS2_Support_Guide
On AM335x, JFFS2 support has been super-seeded by UBIFS. Reasons for disabling JFFS2 support. UBIFS file system is recommended for NAND File system over JFFS2 as it is seen as JFFS2 successor with significant improvements in scalability and NAND support.
https://wiki.dd-wrt.com/wiki/index.php/JFFS
Introduction . Journalling Flash File System (JFFS/JFFS2) is a re-writable area within a DD-WRT-enabled device.. Located in /jffs.; Contents stored: On DD-WRT Device main flash directly on the device (/jffs), or mount --bind /storagelocation /jffs.
http://lkml.iu.edu/hypermail/linux/kernel/1509.0/01999.html
Re: perf fails to mmap data file (JFFS2) From: Andi Kleen Date: Thu Sep 03 2015 - 14:57:45 EST Next message: Barr. Manuel Francisco Suarez: "***Proposal****" Previous message: Austin S Hemmelgarn: "Re: stop breaking dosemu (Re: x86/kconfig/32: Rename CONFIG_VM86 and default it to 'n')" In reply to: Kenth Eriksson: "perf fails to mmap data file ...
http://www.infradead.org/pipermail/linux-mtd/2005-November/014354.html
Hi, Currently jffs2 not support mmap with MAP_SHARED. Is it possible to implement it? What's the drawback? If it's possible, what shoould we do? I changed .mmap from generic_file_readonly_mmap to generic_file_mmap but system crash when I write to mmaped buffer and unmap. Do I need a special writepage? Best regards!
https://unfinishedbitness.info/2013/02/24/enabling-jffs-on-dd-wrt/
Look for the “JFFS2 Support” section again. For the “Clean JFFS” option, click the Enable radio button. DO NOT click “Save” at the bottom! Instead, click Apply at the bottom. The router will format the available space. Wait until the web GUI is back which may take a minute or two. Look for the “JFFS2 Support…
http://e2e.ti.com/support/legacy_forums/omap/f/447/t/66051?jffs2-errors
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https://github.com/boltdb/bolt/issues/704
Jul 12, 2017 · We are using BoltDB for embedded devices and some of them use JFFS2 file system which is not mmap() friendly. Is there a way to make boltDB to fall back to the standard API if mmap is not an option? If it is 1000 times slower it would be...
https://en.wikipedia.org/wiki/JFFS2
JFFS2 introduced: Support for NAND flash devices. This involved a considerable amount of work as NAND devices have a sequential I/O interface and cannot be memory-mapped for reading. Hard links. This was not possible in JFFS because of limitations in the on-disk format. Compression. Four algorithms are available: zlib, rubin, rtime, and lzo.Introduced: September 23, 2001 with Linux 2.4.10
https://sourceware.org/bugzilla/show_bug.cgi?id=5033
Some filesystems, notably JFFS2 which is used in embedded systems such as the OLPC, cannot support shared writable file mapping. Providing a fallback seems extremely simple: on mmap() failure, malloc() a memory buffer and do a final write() operation in close_archive().
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