gistfile1.txt

# /sbin/debugfs /tmp/zeros
debugfs 1.39 (29-May-2006)
debugfs:  ?
Available debugfs requests:

show_debugfs_params, params
                         Show debugfs parameters
open_filesys, open       Open a filesystem
close_filesys, close     Close the filesystem
feature, features        Set/print superblock features
dirty_filesys, dirty     Mark the filesystem as dirty
init_filesys             Initalize a filesystem (DESTROYS DATA)
show_super_stats, stats  Show superblock statistics
ncheck                   Do inode->name translation
icheck                   Do block->inode translation
change_root_directory, chroot
                         Change root directory
change_working_directory, cd
                         Change working directory
list_directory, ls       List directory
show_inode_info, stat    Show inode information
link, ln                 Create directory link
unlink                   Delete a directory link
mkdir                    Create a directory
rmdir                    Remove a directory
rm                       Remove a file (unlink and kill_file, if appropriate)
kill_file                Deallocate an inode and its blocks
clri                     Clear an inode's contents
freei                    Clear an inode's in-use flag
seti                     Set an inode's in-use flag
testi                    Test an inode's in-use flag
freeb                    Clear a block's in-use flag
setb                     Set a block's in-use flag
testb                    Test a block's in-use flag
modify_inode, mi         Modify an inode by structure
find_free_block, ffb     Find free block(s)
find_free_inode, ffi     Find free inode(s)
print_working_directory, pwd
                         Print current working directory

...skipping one line
mknod                    Create a special file
list_deleted_inodes, lsdel
                         List deleted inodes
undelete, undel          Undelete file
write                    Copy a file from your native filesystem
dump_inode, dump         Dump an inode out to a file
cat                      Dump an inode out to stdout
lcd                      Change the current directory on your native filesystem
rdump                    Recursively dump a directory to the native filesystem
set_super_value, ssv     Set superblock value
set_inode_field, sif     Set inode field
logdump                  Dump the contents of the journal
htree_dump, htree        Dump a hash-indexed directory
dx_hash, hash            Calculate the directory hash of a filename
dirsearch                Search a directory for a particular filename
bmap                     Calculate the logical->physical block mapping for an inode
imap                     Calculate the location of an inode
dump_unused              Dump unused blocks
set_current_time         Set current time to use when setting filesystme fields
help                     Display info on command or topic.
list_requests, lr, ?     List available commands.
quit, q                  Leave the subsystem.


debugfs:  ls
 2  (12) .    2  (12) ..    11  (20) lost+found    12  (980) blktrace

debugfs:  stat blktrace
Inode: 12   Type: regular    Mode:  0644   Flags: 0x0   Generation: 2039396507
User:     0   Group:     0   Size: 108740
File ACL: 0    Directory ACL: 0
Links: 1   Blockcount: 216
Fragment:  Address: 0    Number: 0    Size: 0
ctime: 0x52582724 -- Fri Oct 11 18:28:20 2013
atime: 0x52581985 -- Fri Oct 11 17:30:13 2013
mtime: 0x52582724 -- Fri Oct 11 18:28:20 2013
BLOCKS:
(0-11):38-49, (IND):50, (12-106):51-145
TOTAL: 108

debugfs:  bmap blktrace 0
38

debugfs:  bmap blktrace 108
0
debugfs:  bmap blktrace 107
0

debugfs:  bmap blktrace 105
144

debugfs:  bmap blktrace 106
145

debugfs:  testb 145
Block 145 marked in use

debugfs:  testb 146
Block 146 not in use

debugfs:  icheck 145
Block  Inode number
145  12

debugfs:  ncheck 12
Inode	Pathname
12	/blktrace