--- /dev/null
+=========================================================
+¤³¤ì¤Ï¡¢
+Linux-3.7/Documentation/filesystems/btrfs.txt ¤ÎÏÂÌõ¤Ç¤¹¡£
+ËÝÌõÃÄÂΡ§ JF ¥×¥í¥¸¥§¥¯¥È < http://linuxjf.sourceforge.jp/ >
+¹¹¿·Æü ¡§ 2013/01/09
+ËÝÌõ¼Ô ¡§ Seiji Kaneko < skaneko at a2 dot mbn dot or dot jp >
+=========================================================
+
+ BTRFS
+ =====
+
+#Btrfs is a new copy on write filesystem for Linux aimed at
+#implementing advanced features while focusing on fault tolerance,
+#repair and easy administration. Initially developed by Oracle, Btrfs
+#is licensed under the GPL and open for contribution from anyone.
+Btrfs ¤Ï Linux ¸þ¤±¤Î¥³¥Ô¡¼¥ª¥ó¥é¥¤¥È¥¿¥¤¥×¤Î¿·¤·¤¤¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤Ç¡¢ÂѾã
+³²À¡¢²óÉü½èÍý¤È´ÉÍý¤ÎÍưײ½¤Ë½ÅÅÀ¤òÃÖ¤¤Ä¤ÄÀè¿ÊŪ¤Êµ¡Ç½¤ò¼ÂÁõ¤¹¤ë¤³¤È¤òÁÀ
+¤Ã¤¿¤â¤Î¤Ç¤¹¡£ºÇ½é¤Ï Oracle ¼Ò¤Ç³«È¯¤¬¹Ô¤ï¤ì¤Æ¤¤¤Þ¤·¤¿¤¬¡¢¸½ºß¤Ï GPL ¤Ç¥é¥¤
+¥»¥ó¥¹¤µ¤ì¡¢Ã¯¤«¤é¤Î¹×¸¥¤Ç¤â¼õ¤±Æþ¤ì¤Æ¤¤¤Þ¤¹¡£
+
+#Linux has a wealth of filesystems to choose from, but we are facing a
+#number of challenges with scaling to the large storage subsystems that
+#are becoming common in today's data centers. Filesystems need to scale
+#in their ability to address and manage large storage, and also in
+#their ability to detect, repair and tolerate errors in the data stored
+#on disk. Btrfs is under heavy development, and is not suitable for
+#any uses other than benchmarking and review. The Btrfs disk format is
+#not yet finalized.
+Linux ¤Ç¤ÏÁªÂò²Äǽ¤Ê¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤¬ËÉ٤ˤ¢¤ê¤Þ¤¹¤¬¡¢»äã¤Ï¸½ºß¤Î¥Ç¡¼¥¿
+¥»¥ó¥¿¡¼´Ä¶¤Ç°ìÈÌŪ¤Ë¤Ê¤ê¤Ä¤Ä¤¢¤ë¤è¤¦¤ÊµðÂç¤Ê¥¹¥È¥ì¡¼¥¸¥µ¥Ö¥·¥¹¥Æ¥à¤Þ¤Ç¤Î
+³ÈÄ¥À¤ò¼Â¸½¤¹¤ë¤¿¤á¤Ë¡¢ÍÍ¡¹¤Êµ»½ÑŪĩÀï¤Ë¼è¤êÁȤó¤Ç¤¤Þ¤·¤¿¡£¥Õ¥¡¥¤¥ë¥·¥¹¥Æ
+¥à¤ÏµðÂç¤Ê¥¹¥È¥ì¡¼¥¸¤ò¥¢¥¯¥»¥¹¤ª¤è¤Ó´ÉÍý¤¹¤ëµ¡Ç½¤òÈ÷¤¨¤Æ³ÈÄ¥¤Ç¤¤ëɬÍפ¬¤¢
+¤ê¡¢¤Þ¤¿¥Ç¥£¥¹¥¯¾å¤Î¥Ç¡¼¥¿¤Î¥¨¥é¡¼¤Îȯ¸«¡¦½¤Éü¡¦ÂѾ㳲À¤¬¼Â¸½¤µ¤ì¤Ê¤±¤ì¤Ð
+¤¤¤±¤Þ¤»¤ó¡£Btrfs ¤Ï¸½ºß±Ô°Õ³«È¯Ãæ¤Ç¤¢¤ê¡¢¥Ù¥ó¥Á¥Þ¡¼¥¯¤ò¼è¤ë¤³¤È¤È¥ì¥Ó¥å¡¼
+¤ò¹Ô¤¦¤³¤È°Ê³°¤ÎÌÜŪ¤Ë¤ÏŬ¤·¤Æ¤¤¤Þ¤»¤ó¡£Btrfs ¤Î¥Ç¥£¥¹¥¯¥Õ¥©¡¼¥Þ¥Ã¥È¤âºÇ½ª
+ÈǤȤϤʤäƤ¤¤Þ¤»¤ó¡£
+
+#The main Btrfs features include:
+Btrfs ¤Î¼ç¤Êµ¡Ç½¤Ë¤Ï°Ê²¼¤Î¤â¤Î¤¬´Þ¤Þ¤ì¤Þ¤¹¡£
+
+# * Extent based file storage (2^64 max file size)
+# * Space efficient packing of small files
+# * Space efficient indexed directories
+# * Dynamic inode allocation
+# * Writable snapshots
+# * Subvolumes (separate internal filesystem roots)
+# * Object level mirroring and striping
+# * Checksums on data and metadata (multiple algorithms available)
+# * Compression
+# * Integrated multiple device support, with several raid algorithms
+# * Online filesystem check (not yet implemented)
+# * Very fast offline filesystem check
+# * Efficient incremental backup and FS mirroring (not yet implemented)
+# * Online filesystem defragmentation
+ * ¥¨¥¯¥¹¥Æ¥ó¥È¥Ù¡¼¥¹¤Î¥Õ¥¡¥¤¥ë¥¹¥È¥ì¡¼¥¸ (ºÇÂç¥Õ¥¡¥¤¥ë¥µ¥¤¥º 2^64 ¥Ð¥¤¥È)
+ * ¾®¤µ¤Ê¥Õ¥¡¥¤¥ë¤òÊ£¿ôµÍ¤á¹þ¤à¤³¤È¤Ë¤è¤ëÍÆÎ̤θúΨŪÍøÍÑ
+ * ¥¤¥ó¥Ç¥Ã¥¯¥¹¥Ç¥£¥ì¥¯¥È¥ê¤Ë¤è¤ëÍÆÎ̤θúΨŪÍøÍÑ
+ * ưŪ¤Ê inode ¤Î³ä¤êÅö¤Æ
+ * ½ñ¤´¹¤¨²Äǽ¤Ê¥¹¥Ê¥Ã¥×¥·¥ç¥Ã¥Èµ¡Ç½
+ * ¥µ¥Ö¥Ü¥ê¥å¡¼¥à (ÆâÉô¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥ë¡¼¥È¤òÊ£¿ô»ý¤Ä¤³¤È¤¬²Äǽ)
+ * ¥ª¥Ö¥¸¥§¥¯¥È¥ì¥Ù¥ë¤Î¥ß¥é¡¼¥ê¥ó¥°¤È¥¹¥È¥é¥¤¥Ô¥ó¥°
+ * ¥Ç¡¼¥¿¤È¥á¥¿¥Ç¡¼¥¿¤Î¥Á¥§¥Ã¥¯¥µ¥à (Ê£¿ô¤Î¥¢¥ë¥´¥ê¥º¥à¤¬»ØÄê²Äǽ)
+ * °µ½Ìµ¡Ç½
+ * ¤¤¤¯¤Ä¤«¤Î RAID ¥¢¥ë¥´¥ê¥º¥à¤òÄ󶡤¹¤ë¡¢Ê£¿ô¥Ç¥Ð¥¤¥¹¥µ¥Ý¡¼¥Èµ¡Ç½¤ÎÅý¹ç
+ * ¥ª¥ó¥é¥¤¥ó¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥Á¥§¥Ã¥¯ (̤¼ÂÁõ)
+ * ¤È¤Æ¤â¹â®¤Ê¥ª¥Õ¥é¥¤¥ó¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥Á¥§¥Ã¥¯
+ * ¸úΨŪ¤Êº¹Ê¬¥Ð¥Ã¥¯¥¢¥Ã¥×¤È¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥ß¥é¡¼¥ê¥ó¥° (̤¼ÂÁõ)
+ * ¥ª¥ó¥é¥¤¥ó¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥Ç¥Õ¥é¥°µ¡Ç½
+
+
+
+# MAILING LIST
+# ============
+ ¥á¡¼¥ê¥ó¥°¥ê¥¹¥È
+ ================
+
+#There is a Btrfs mailing list hosted on vger.kernel.org. You can
+#find details on how to subscribe here:
+vgar.kernel.org ¤Ç¥Û¥¹¥Æ¥£¥ó¥°¤µ¤ì¤Æ¤¤¤ë Btrfs ¥á¡¼¥ê¥ó¥°¥ê¥¹¥È¤¬Í¤ê¤Þ¤¹¡£
+¹ØÆɤΤ¿¤á¤Î¾ÜºÙ¤Ï°Ê²¼¤ò¤´Í÷¤¯¤À¤µ¤¤¡£
+
+http://vger.kernel.org/vger-lists.html#linux-btrfs
+
+#Mailing list archives are available from gmane:
+¥á¡¼¥ê¥ó¥°¥ê¥¹¥È¥¢¡¼¥«¥¤¥Ö¤Ï¡¢gmane ¤ÇÄ󶡤µ¤ì¤Æ¤¤¤Þ¤¹¡£
+
+http://dir.gmane.org/gmane.comp.file-systems.btrfs
+
+
+
+ IRC
+ ===
+
+#Discussion of Btrfs also occurs on the #btrfs channel of the Freenode
+#IRC network.
+Btrfs ¤Ë´Ø¤¹¤ëµÄÏÀ¤Ï¡¢Freenode IRC ¥Í¥Ã¥È¥ï¡¼¥¯¤Î #btrfs ¥Á¥ã¥Í¥ë¤Ç¤â¹Ô¤ï¤ì
+¤Æ¤¤¤Þ¤¹¡£
+
+
+
+# UTILITIES
+# =========
+ ¥æ¡¼¥Æ¥£¥ê¥Æ¥£
+ ==============
+
+#Userspace tools for creating and manipulating Btrfs file systems are
+#available from the git repository at the following location:
+Btrfs ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤òºîÀ®¡¦´ÉÍý¤¹¤ë¤¿¤á¤Î¥æ¡¼¥¶¶õ´Ö¥Ä¡¼¥ë¤Ï°Ê²¼¤Î git ¥ê
+¥Ý¥¸¥È¥ê¤«¤éÆþ¼ê¤Ç¤¤Þ¤¹¡£
+
+ http://git.kernel.org/?p=linux/kernel/git/mason/btrfs-progs.git
+ git://git.kernel.org/pub/scm/linux/kernel/git/mason/btrfs-progs.git
+
+#These include the following tools:
+¤³¤³¤Ç¤Ï¡¢°Ê²¼¤Î¥Ä¡¼¥ë¤¬Æþ¼ê¤Ç¤¤Þ¤¹¡£
+
+#mkfs.btrfs: create a filesystem
+mkfs.btrfs: ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¤òºîÀ®¤¹¤ë¥Ä¡¼¥ë
+
+#btrfsctl: control program to create snapshots and subvolumes:
+btrfsctl: ¥¹¥Ê¥Ã¥×¥·¥ç¥Ã¥È¤È¥µ¥Ö¥Ü¥ê¥å¡¼¥à¤òºîÀ®¤¹¤ëÀ©¸æ¥×¥í¥°¥é¥à
+
+ mount /dev/sda2 /mnt
+ btrfsctl -s new_subvol_name /mnt
+ btrfsctl -s snapshot_of_default /mnt/default
+ btrfsctl -s snapshot_of_new_subvol /mnt/new_subvol_name
+ btrfsctl -s snapshot_of_a_snapshot /mnt/snapshot_of_new_subvol
+ ls /mnt
+ default snapshot_of_a_snapshot snapshot_of_new_subvol
+ new_subvol_name snapshot_of_default
+
+# Snapshots and subvolumes cannot be deleted right now, but you can
+# rm -rf all the files and directories inside them.
+ ¥¹¥Ê¥Ã¥×¥·¥ç¥Ã¥È¤È¥µ¥Ö¥Ü¥ê¥å¡¼¥à¤Ï¸½ºß¤Î¤È¤³¤íºï½ü¤Ç¤¤Þ¤»¤ó¤¬¡¢Æâ
+ Éô¤ÎÁ´¤Æ¤Î¥Õ¥¡¥¤¥ë¤È¥Ç¥£¥ì¥¯¥È¥ê¤Ï rm -rf ¤Çºï½ü¤Ç¤¤Þ¤¹¡£
+
+#btrfsck: do a limited check of the FS extent trees.
+btrfsck: ¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥¨¥¯¥¹¥Æ¥ó¥ÈÌڤˡ¢¸ÂÄꤵ¤ì¤¿¥Á¥§¥Ã¥¯¤ò¹Ô¤¦¡£
+
+#btrfs-debug-tree: print all of the FS metadata in text form. Example:
+btrfs-debug-tree: Á´¤Æ¤Î¥Õ¥¡¥¤¥ë¥·¥¹¥Æ¥à¥á¥¿¥Ç¡¼¥¿¤ò¥Æ¥¥¹¥È·Á¼°¤Ç½ÐÎϤ·¤Þ
+¤¹¡£»È¤¤Êý¤ò°Ê²¼¤Ë¼¨¤·¤Þ¤¹¡£
+
+ btrfs-debug-tree /dev/sda2 >& big_output_file
+
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