This series adds the Linux dcache implementation to barebox. Until now every filesystem driver resolves the full path to a file for itself. This leads to code duplication and is error prone since resolving paths is a complicated task. Also it can narrow down the lookup performance since barebox only knows ASCII paths and has no way of caching lookups. Since with this barebox provides a interface to dentries much like the Linux Kernel does it gets easier to share filesystem code between barebox and Linux. With this series we get the Linux dcache implementation. The path resolving code from fs/namei.c is nearly taken as-is, minus the RCU and locking code. Dcaching is made simple as of now: We simply cache everything and never release any dentries. Although we do reference counting for inodes and dentries it is effectively not used yet. We never free anything until a fs is unmounted in which case we free everything no matter if references are taken or not. This patch fundamentally changes the way lookups are done in the filesystem drivers and I found no sane way to maintain a backwards compatible code path for not yet converted filesystem drivers. This means *all* filesystems are marked as broken with the introduction of the dcache implementation. I won't apply this series for now (except for the preparatory pathces). The most important filesystems are already converted with this series, but there are a few missing like FAT and squashfs and some more no so prominent ones. Overall I planned this change for longer now and I can say the new code feels good. The performance is better, links are resolved more correctly and the individual filesystem implementations get simpler. I'll continue on this series soon, but it'll need some time to fix the remaining filesystems (of course, feel free to do some of the work to speed things up;) Sascha Sascha Hauer (19): rename file_operations -> cdev_operations ubifs: remove dead code ubifs: Remove Linux struct definitions we already have ubifs: remove dead code fs: Add super_operations fs: Move mem_write/mem_read to devfs-core fs: Cleanup whitespace damage fs: Fix finding correct directory for mkdir/rmdir glob: do not unnecessarily opendir() a directory ls: Do not depend on normalise_path() loadenv: Do not depend on normalise_path() fs: dcache implementation fs: ramfs: Switch to dcache implementation fs: devfs: Switch to dcache implementation fs: ext4: Switch to dcache implementation fs: ubifs: Switch to dcache implementation fs: nfs: Switch to dcache implementation fs: tftp: Switch to dcache implementation block: Adjust cache sizes arch/arm/mach-mxs/ocotp.c | 2 +- arch/sandbox/board/hostfile.c | 2 +- commands/loadenv.c | 6 +- commands/ls.c | 9 +- commands/mem.c | 2 +- commands/stddev.c | 8 +- common/block.c | 6 +- common/firmware.c | 2 +- drivers/base/regmap/regmap.c | 2 +- drivers/eeprom/at24.c | 2 +- drivers/eeprom/at25.c | 2 +- drivers/hw_random/core.c | 2 +- drivers/mfd/act8846.c | 2 +- drivers/mfd/lp3972.c | 2 +- drivers/mfd/mc34704.c | 2 +- drivers/mfd/mc9sdz60.c | 2 +- drivers/mfd/stmpe-i2c.c | 2 +- drivers/mfd/twl-core.c | 2 +- drivers/misc/jtag.c | 2 +- drivers/misc/sram.c | 2 +- drivers/mtd/core.c | 2 +- drivers/mtd/mtdoob.c | 2 +- drivers/mtd/mtdraw.c | 4 +- drivers/mtd/nand/nand-bb.c | 2 +- drivers/mtd/ubi/barebox.c | 4 +- drivers/net/e1000/eeprom.c | 4 +- drivers/net/ksz8864rmn.c | 2 +- drivers/net/phy/mdio_bus.c | 2 +- drivers/nvmem/core.c | 2 +- drivers/video/fb.c | 2 +- drivers/w1/slaves/w1_ds2431.c | 2 +- drivers/w1/slaves/w1_ds2433.c | 2 +- fs/Kconfig | 8 + fs/Makefile | 2 +- fs/devfs-core.c | 70 +- fs/devfs.c | 150 +- fs/ext4/ext_barebox.c | 280 ++-- fs/ext4/ext_common.h | 3 + fs/fat/Kconfig | 1 + fs/fs.c | 3696 ++++++++++++++++++++++++++--------------- fs/libfs.c | 87 + fs/nfs.c | 542 +++--- fs/pstore/Kconfig | 1 + fs/ramfs.c | 412 ++--- fs/squashfs/Kconfig | 1 + fs/tftp.c | 96 +- fs/ubifs/Makefile | 2 +- fs/ubifs/dir.c | 410 +++++ fs/ubifs/super.c | 157 +- fs/ubifs/ubifs.c | 816 +-------- fs/ubifs/ubifs.h | 547 +----- include/console.h | 2 +- include/dirent.h | 3 + include/driver.h | 4 +- include/fs.h | 25 +- include/linux/dcache.h | 109 +- include/linux/fs.h | 136 +- include/linux/mount.h | 3 + include/linux/namei.h | 52 + include/linux/stat.h | 2 + include/mfd/twl-core.h | 2 +- lib/glob.c | 15 +- 62 files changed, 3960 insertions(+), 3765 deletions(-) create mode 100644 fs/libfs.c create mode 100644 fs/ubifs/dir.c create mode 100644 include/linux/namei.h -- 2.16.1 _______________________________________________ barebox mailing list barebox@xxxxxxxxxxxxxxxxxxx http://lists.infradead.org/mailman/listinfo/barebox
