Differences between version 12 and revision by previous author of Inode.
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| Newer page: | version 12 | Last edited on Monday, June 4, 2007 2:01:36 pm | by BenStaz | Revert |
| Older page: | version 5 | Last edited on Saturday, July 23, 2005 2:17:29 pm | by AristotlePagaltzis | Revert |
@@ -1,3 +1,42 @@
-An [Inode] specifies which DiskCluster~s
a file occupies as well as a few attributes such as creation and last-modification times
. To that end it
contains a list of direct, indirect, and doubly and triply indirect pointers. On some FileSystems, very small files can be stored directly in the [Inode] itself.
+An inode stores basic information about
a regular
file, directory, or other file system object
. It
contains a list of direct, indirect, and doubly and triply indirect pointers. On some FileSystems, very small files can be stored directly in the [Inode] itself.
-Sophisticated FileSystems create [Inode]s on demand, but with most, the number of [Inode]s on a [Partition] has to be decided on during FileSystem creation. It is rare to run out of [Inode]s unless you have an unusual usage profile such as storing a news spool or [Squid] cache. To see how
many [Inode]s are free
, use
<tt
>df
-i
</tt
>.
+The inode number is a unique integer assigned to the device upon which it is stored. All files are hard links to inodes. Whenever a program refers to a file by name, the system conceptually uses the filename to search for the corresponding inode.
+
+
Sophisticated FileSystems create [Inode]s on demand, but with most, the number of [Inode]s on a [Partition] has to be decided on during FileSystem creation. It is rare to run out of [Inode]s unless you have an unusual usage profile such as storing a news spool or [Squid] cache. Exhaustion of the inodes will prohibit the creation of additional files even if sufficient HDD space exists.
+
+!!How
many Inodes do I have free?
+
+*df - i
+
+!!What information does an
[Inode] store?
+
+Note : Inodes do NOT contain filenames.
+
+* The size of the file in bytes.
+* The file'
s physical location (the addresses of the blocks of storage containing the file's data on a HDD)
+* The file's permissions.
+* The Device ID
+* The User ID of the file's owner.
+* The Group ID of the file.
+* Timestamps (ctime
,mtime and atime). See [FileTimes]
+* A reference count telling how many hard links point to the [Inode].
+
+!!View Inode Information for a particular file.
+
+For example [PhilMurray's|PhilMurray] famous macaroni and cheese recipe:
+
+
<verbatim
>
+$stat macaroni_and_cheese
+
+ File: `macaroni_and_cheese'
+ Size: 1965 Blocks: 8 IO Block: 4096 regular file
+Device: 305h/773d Inode: 2775423 Links: 1
+Access: (0644/
-rw-r--r--) Uid: ( 1000/ staz) Gid: ( 1000/ staz)
+Access: 2007-05-16 00:21:17.000000000 +1200
+Modify: 2007-05-16 00:21:16.000000000 +1200
+Change: 2007-05-16 00:21:16.000000000 +1200
+
</verbatim>
+
+!!How to obtain a file's [Inode] number
+
+*ls -i <file
>
