{"id":3387,"date":"2022-12-20T17:02:31","date_gmt":"2022-12-20T20:02:31","guid":{"rendered":"http:\/\/lode.uno\/linux-man\/index.php\/2022\/12\/20\/jfs_debugfs-man8\/"},"modified":"2022-12-20T17:02:31","modified_gmt":"2022-12-20T20:02:31","slug":"jfs_debugfs-man8","status":"publish","type":"post","link":"https:\/\/lode.uno\/linux-man\/2022\/12\/20\/jfs_debugfs-man8\/","title":{"rendered":"jfs_debugfs (man8)"},"content":{"rendered":"

jfs_debugfs<\/h1>\n

NAME<\/a>
SYNOPSIS<\/a>
DESCRIPTION<\/a>
COMMANDS<\/a>
REPORTING BUGS<\/a>
SEE ALSO<\/a>
AUTHORS<\/a> <\/p>\n

\n

NAME <\/a> <\/h2>\n

jfs_debugfs<\/b> \u2212 shell-type JFS file system editor<\/p>\n

SYNOPSIS <\/a> <\/h2>\n

jfs_debugfs<\/b> device<\/i><\/p>\n

DESCRIPTION <\/a> <\/h2>\n

jfs_debugfs<\/b><\/i> is a program which can be used to perform various low-level actions on a JFS formatted device.<\/p>\n

device<\/i> is the special file name corresponding to the actual device to be edited (e.g. \/dev\/hdb1<\/b>).<\/p>\n

jfs_debugfs<\/b> must be run as root.<\/p>\n

COMMANDS <\/a> <\/h2>\n

a[lter]<\/b> <\/i><\/p>\n

replaces the data located at the <\/i> of <\/i> with <\/i><\/p>\n

<\/i> is the block number – given in decimal<\/p>\n

<\/i> is the offset within that block – given in hexadecimal<\/p>\n

<\/i> is an even-numbered string of hexadecimal digits to write to the disk<\/p>\n

b[tree]<\/b> []<\/i><\/p>\n

* not implemented yet *<\/b>
displays one node of the btree located at <\/i> of <\/i> and enters a subcommand mode to navigate the btree<\/p>\n

SUBCOMMANDS:<\/b>
l => visit left sibling
m => modify current node
p => visit parent node
r => visit right sibling
[0-9] => visit the n\u2019th child node
x => exit subcommand mode<\/p>\n

cb[blfsck]<\/b><\/p>\n

displays the area used by ClearBadBlockList for communication with fsck<\/p>\n

SUBCOMMANDS:<\/b>
m => modify entries
x => exit subcommand mode<\/p>\n

dir[ectory]<\/b> []<\/i><\/p>\n

displays the directory entries at <\/i> and enters subcommand mode<\/p>\n

<\/i> is the directory\u2019s inode – given in decimal<\/p>\n

<\/i> currently must be zero<\/p>\n

SUBCOMMANDS:<\/b>
m => modify entries
x => exit subcommand mode<\/p>\n

d[isplay]<\/b> [ [ [ []]]]<\/i><\/p>\n

displays <\/i> objects located at the <\/i> of <\/i> in <\/i><\/p>\n

<\/i> is the block number – given in decimal<\/p>\n

<\/i> is the offset within <\/i> – given in hexadecimal<\/p>\n

<\/i> is one of the following:
a => ascii
b => block allocation map
d => decimal
i => inode
I => inode allocation map
s => superblock
x => hexadecimal
X => extent allocation descriptor<\/p>\n

<\/i> is the number of objects to display – given in decimal<\/p>\n\n\n
<\/td>\n\n

dm[ap]<\/b><\/p>\n<\/td>\n

<\/td>\n\n

displays aggregate disk (block) map<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

SUBCOMMANDS<\/b>
m => modify map fields
f => display free count
t => display tree levels
x => exit subcommand mode<\/p>\n

dt[ree]<\/b> []<\/i><\/p>\n

displays root of the directory btree located at <\/i> and enters a subcommand mode to navigate the btree<\/p>\n

<\/i> is the directory\u2019s inode – given in decimal<\/p>\n

<\/i> currently must be zero<\/p>\n

SUBCOMMANDS<\/b>
l => visit left sibling
m => modify current node
p => visit parent node (not parent directory)
r => visit right sibling
[0-9] => visit the n\u2019th child node
x => exit subcommand mode<\/p>\n

fsckw[sphdr]<\/b><\/p>\n

displays the header of the fsck workspace in the aggregate<\/p>\n

SUBCOMMANDS:<\/b>
m => modify entries
x => exit subcommand mode<\/p>\n

h[elp]<\/b> []<\/i><\/p>\n

displays help for <\/i>
if no command is given, all possible commands are displayed<\/p>\n

ia[g]<\/b> [] [a | s | ]<\/i><\/p>\n

displays IAG information for <\/i> and enters subcommand mode<\/p>\n

<\/i> is given in decimal<\/p>\n

a<\/i> is to use the primary aggregate inode table<\/p>\n

s<\/i> is to use the secondary aggregate inode table<\/p>\n

<\/i> currently must be zero<\/p>\n

SUBCOMMANDS<\/b>
e => display\/modify inode extents map
m => modify IAG
p => display\/modify persistent map
w => display\/modify working map
x => exit subcommand mode<\/p>\n

i[node]<\/b> [] [a | s | ]<\/i><\/p>\n

displays inode information for <\/i> and enters subcommand mode<\/p>\n

<\/i> is given in decimal<\/p>\n

a<\/i> is to use the primary aggregate inode table<\/p>\n

s<\/i> is to use the secondary aggregate inode table<\/p>\n

<\/i> currently must be zero<\/p>\n

SUBCOMMANDS<\/b>
a => display\/modify inode\u2019s ACL
m => modify inode
x => exit subcommand mode<\/p>\n

logs[uper]<\/b><\/p>\n

displays the journal log superblock and enters subcommand mode<\/p>\n

SUBCOMMANDS<\/b>
m => modify journal log superblock
x => exit subcommand mode<\/p>\n\n\n
<\/td>\n\n

q[uit]<\/b><\/p>\n<\/td>\n

<\/td>\n\n

exits jfs_debugfs<\/p>\n<\/td>\n

 <\/td>\n<\/tr>\n<\/table>\n

se[t]<\/b> [ ]<\/i><\/p>\n

* not implemented yet *<\/b>
set user-defined <\/i> to <\/i>
if no arguments are given, displays all set variables<\/p>\n

<\/i> must begin with an alphabetic character<\/p>\n

su[perblock]<\/b> [p | s]<\/i><\/p>\n

displays superblock data<\/p>\n

p<\/i> displays the primary superblock<\/p>\n

s<\/i> displays the secondary superblock<\/p>\n

SUBCOMMANDS:<\/b>
m => modify entries
x => exit subcommand mode<\/p>\n

s2p[erblock]<\/b> [p | s]<\/i><\/p>\n

displays alternate superblock data<\/p>\n

p<\/i> displays the primary superblock<\/p>\n

s<\/i> displays the secondary superblock<\/p>\n

SUBCOMMANDS:<\/b>
m => modify entries
x => exit subcommand mode<\/p>\n

u[nset]<\/b> <\/i><\/p>\n

* not implemented yet *<\/b>
deletes user-defined <\/i><\/p>\n

xt[ree]<\/b> []<\/i><\/p>\n

displays root of the non-directory btree located at <\/i> and enters a subcommand mode to navigate the btree<\/p>\n

<\/i> is the directory\u2019s inode – given in decimal<\/p>\n

<\/i> currently must be zero<\/p>\n

SUBCOMMANDS<\/b>
l => visit left sibling
m => modify current node
p => visit parent node (not parent directory)
r => visit right sibling
[0-9] => visit the n\u2019th child node
x => exit subcommand mode<\/p>\n

REPORTING BUGS <\/a> <\/h2>\n

If you find a bug in JFS<\/b> or jfs_debugfs<\/b>, please report it via the bug tracking system (“Report Bugs” section) of the JFS project web site:
http:\/\/jfs.sourceforge.net\/<\/p>\n

Please send as much pertinent information as possible, including the complete output of running jfs_fsck<\/b> with the \u2212v<\/b> and \u2212n<\/b> options on the JFS device.<\/p>\n

SEE ALSO <\/a> <\/h2>\n

jfs_fsck<\/b>(8), jfs_mkfs<\/b>(8), jfs_fscklog<\/b>(8), jfs_logdump<\/b>(8), jfs_tune<\/b>(8),<\/p>\n

AUTHORS <\/a> <\/h2>\n

Barry Arndt (barndt@us.ibm.com)
William Braswell, Jr.<\/p>\n

jfs_debugfs<\/b> is maintained by IBM.
See the JFS project web site for more details:
http:\/\/jfs.sourceforge.net\/<\/p>\n

\n","protected":false},"excerpt":{"rendered":"

jfs_debugfs \u2212 shell-type JFS file system editor <\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2],"tags":[5,52,515,4],"class_list":["post-3387","post","type-post","status-publish","format-standard","hentry","category-8-administracion-del-sistema","tag-5","tag-administracion","tag-jfs_debugfs","tag-man8"],"gutentor_comment":0,"_links":{"self":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/3387","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/comments?post=3387"}],"version-history":[{"count":0,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/posts\/3387\/revisions"}],"wp:attachment":[{"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/media?parent=3387"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/categories?post=3387"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/lode.uno\/linux-man\/wp-json\/wp\/v2\/tags?post=3387"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}