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    Subject[PATCH 00/16 v3] f2fs: introduce flash-friendly file system
    Change log from v2:

    o Fix compilation error for arm [Max]
    o Move proc entries to debugfs [Greg]
    o Add i_atime, i_generation, etc [Neil]
    o Support NFS export [Changman]
    o Move the f2fs magic number [Marco]
    o Add s_time_gran [Marco]
    o Fix f2fs_truncate [Marco]
    o Enhance f2fs document [Vyacheslav]
    o Support uuid and add additional comments [Vyacheslav]
    o Change superblock offset [Vyacheslav]
    o Fix some bugs and return values [Vyacheslav]
    o Improve initial mount time [Jaegeuk]
    o Fix f2fs-tools environment [Mike]

    I've set up a git tree in for f2fs-tools.
    Please download f2fs-tools by tag: for_patch_set_v3.

    Change log from v1:

    o Apply the recent user namespace changes [Eric]
    o Remove unnecessary condition check [Al]
    o Fix wrong description [Stefan]
    o Fix f2fs document [Randy]
    o Enlarge the volume label length to 256 unicodes [Martin]
    o Support time resolution to nano scale [Boaz]
    o Fix the wrong use of endian conversion [David]
    o Fix the use of mutex and spinlocks [David]
    o Remove the use of __GFP_NOFAIL, etc [Neil]
    o Change the flow for readability [Neil]
    o Reduce the lock contention in CP [Neil]
    o Support multiples of section size [Arnd]
    o Support configurable extension list [Arnd]
    o Support configurable active log numbers [Arnd]

    [Furture works]
    o Aware of file access pattern
    o Erase block indirect
    o Sub-page write avoidance
    o in-line data
    o xattr optimization/in-line xattrs

    I really appreciate the valuable comments from all of you in community.


    This is a new patch set for the f2fs file system.

    What is F2FS?

    NAND flash memory-based storage devices, such as SSD, eMMC, and SD cards, have
    been widely being used for ranging from mobile to server systems. Since they are
    known to have different characteristics from the conventional rotational disks,
    a file system, an upper layer to the storage device, should adapt to the changes
    from the sketch.

    F2FS is a new file system carefully designed for the NAND flash memory-based storage
    devices. We chose a log structure file system approach, but we tried to adapt it
    to the new form of storage. Also we remedy some known issues of the very old log
    structured file system, such as snowball effect of wandering tree and high cleaning

    Because a NAND-based storage device shows different characteristics according to
    its internal geometry or flash memory management scheme aka FTL, we add various
    parameters not only for configuring on-disk layout, but also for selecting allocation
    and cleaning algorithms.

    Patch set

    The patch #1 adds a document to Documentation/filesystems/.
    The patch #2 adds a header file of on-disk layout to include/linux/.
    The patches #3-#16 adds f2fs source files to fs/f2fs/.
    The Last patch, patch #16, updates Makefile and Kconfig.


    The file system formatting tool, "mkfs.f2fs", is available from the following
    download page:


    If you'd like to experience f2fs, simply:
    # mkfs.f2fs /dev/sdb1
    # mount -t f2fs /dev/sdb1 /mnt/f2fs

    Short log

    Jaegeuk Kim (17):
    f2fs: add document
    f2fs: add on-disk layout
    f2fs: add superblock and major in-memory structure
    f2fs: add super block operations
    f2fs: add checkpoint operations
    f2fs: add node operations
    f2fs: add segment operations
    f2fs: add file operations
    f2fs: add address space operations for data
    f2fs: add core inode operations
    f2fs: add inode operations for special inodes
    f2fs: add core directory operations
    f2fs: add xattr and acl functionalities
    f2fs: add garbage collection functions
    f2fs: add recovery routines for roll-forward
    f2fs: move proc files to debugfs
    f2fs: update Kconfig and Makefile

    Documentation/filesystems/00-INDEX | 2 +
    Documentation/filesystems/f2fs.txt | 417 +++++++++
    fs/Kconfig | 1 +
    fs/Makefile | 1 +
    fs/f2fs/Kconfig | 52 ++
    fs/f2fs/Makefile | 7 +
    fs/f2fs/acl.c | 465 ++++++++++
    fs/f2fs/acl.h | 57 ++
    fs/f2fs/checkpoint.c | 792 ++++++++++++++++
    fs/f2fs/data.c | 701 ++++++++++++++
    fs/f2fs/debug.c | 361 ++++++++
    fs/f2fs/dir.c | 674 ++++++++++++++
    fs/f2fs/f2fs.h | 1062 +++++++++++++++++++++
    fs/f2fs/file.c | 637 +++++++++++++
    fs/f2fs/gc.c | 742 +++++++++++++++
    fs/f2fs/gc.h | 117 +++
    fs/f2fs/hash.c | 98 ++
    fs/f2fs/inode.c | 266 ++++++
    fs/f2fs/namei.c | 504 ++++++++++
    fs/f2fs/node.c | 1763 +++++++++++++++++++++++++++++++++++
    fs/f2fs/node.h | 353 +++++++
    fs/f2fs/recovery.c | 375 ++++++++
    fs/f2fs/segment.c | 1798 ++++++++++++++++++++++++++++++++++++
    fs/f2fs/segment.h | 615 ++++++++++++
    fs/f2fs/super.c | 656 +++++++++++++
    fs/f2fs/xattr.c | 389 ++++++++
    fs/f2fs/xattr.h | 145 +++
    include/linux/f2fs_fs.h | 410 ++++++++
    include/uapi/linux/magic.h | 1 +
    29 files changed, 13461 insertions(+)
    create mode 100644 Documentation/filesystems/f2fs.txt
    create mode 100644 fs/f2fs/Kconfig
    create mode 100644 fs/f2fs/Makefile
    create mode 100644 fs/f2fs/acl.c
    create mode 100644 fs/f2fs/acl.h
    create mode 100644 fs/f2fs/checkpoint.c
    create mode 100644 fs/f2fs/data.c
    create mode 100644 fs/f2fs/debug.c
    create mode 100644 fs/f2fs/dir.c
    create mode 100644 fs/f2fs/f2fs.h
    create mode 100644 fs/f2fs/file.c
    create mode 100644 fs/f2fs/gc.c
    create mode 100644 fs/f2fs/gc.h
    create mode 100644 fs/f2fs/hash.c
    create mode 100644 fs/f2fs/inode.c
    create mode 100644 fs/f2fs/namei.c
    create mode 100644 fs/f2fs/node.c
    create mode 100644 fs/f2fs/node.h
    create mode 100644 fs/f2fs/recovery.c
    create mode 100644 fs/f2fs/segment.c
    create mode 100644 fs/f2fs/segment.h
    create mode 100644 fs/f2fs/super.c
    create mode 100644 fs/f2fs/xattr.c
    create mode 100644 fs/f2fs/xattr.h
    create mode 100644 include/linux/f2fs_fs.h


    Jaegeuk Kim

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