Date: Thu, 8 Jul 2010 23:15:57 -0700 From: Ali Mashtizadeh <mashtizadeh@gmail.com> To: freebsd-fs@freebsd.org Subject: ufs_db: UFS debugging and exploration tool Message-ID: <AANLkTinDzLuo5rMLAMJRlpxCv-fkY22XEiQTyK36FTR7@mail.gmail.com>
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Hi Folks, I just wanted to point folks to a tool I wrote to walk over a UFS file-system and examine some of it's structures. It might be useful for UFS development, analyzing corruptions, and more. I was curious to gauge the interest in this tool if there is I'll continue to extend it and add support for additional structures and support modification of the file-system. mercurial repository available at https://bitbucket.org/mashtizadeh/ufs_db ~ List of currently supported commands ~ help Print this message echo Echo a string to stdout exec Execute a script opendev Open a device closedev Close a device bread Read a block in as hex sb Select superblock cg Select a cylinder group ino Get an Inode read Read from the current file list Show a directory listing ~ Example output on a newly created file system ~ ufs_db> opendev /dev/md0 ufs_db> ino 2 Inode 2 (block 0) di_mode 16877 Mode bits di_nlink 3 Link count di_uid 0 File owner di_gid 0 File group di_blksize 0 Inode blocksize di_size 512 File byte count di_blocks 4 Blocks actually held di_atime 1278655907 Last access time di_mtime 1278655907 Last modified time di_ctime 1278655907 Last inode change time di_birthtime 1278655907 Inode creation time di_mtimensec 0 Last modified time (ns) di_atimensec 0 Last access time (ns) di_ctimensec 0 Last inode change time (ns) di_birthnsec 0 Inode creation time (ns) di_kernflags 0 Kernel flags di_flags 0 Status flags (chflags) di_extsize 0 External attributes block size di_extb [0] 0 External attributes blocks di_extb [1] 0 External attributes blocks di_db [0] 584 Direct disk blocks di_db [1] 0 Direct disk blocks di_db [2] 0 Direct disk blocks di_db [3] 0 Direct disk blocks di_db [4] 0 Direct disk blocks di_db [5] 0 Direct disk blocks di_db [6] 0 Direct disk blocks di_db [7] 0 Direct disk blocks di_db [8] 0 Direct disk blocks di_db [9] 0 Direct disk blocks di_db [10] 0 Direct disk blocks di_db [11] 0 Direct disk blocks di_ib [0] 0 Indirect disk blocks di_ib [1] 0 Indirect disk blocks di_ib [2] 0 Indirect disk blocks di_modrev 0 i_modrev for NFSv4 ufs_db> list 0 2336 Filename Inode Type . 2 4 .. 2 4 .snap 3 4 Thanks, -- Ali Mashtizadeh علی مشتی زاده
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