Difference between revisions of "Inode"
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[[wikipedia:inode]] | [[wikipedia:inode]] | ||
| − | filename to inode lookup | + | [[filename]] to inode lookup |
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| + | Inodes store information about files and directories (folders), such as file ownership, access mode (read, write, execute permissions), and file type. | ||
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| + | Within a POSIX system, a [[file]] has the following attributes[10] which may be retrieved by the <code>[[stat]]</code> system call: | ||
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| + | * Device ID (this identifies the device containing the file; that is, the scope of uniqueness of the serial number). | ||
| + | * File serial numbers. (Inode) | ||
| + | * The file mode which determines the file type and how the file's owner, its group, and others can access the file. | ||
| + | * A link count telling how many hard links point to the inode. | ||
| + | * The User ID of the file's owner. | ||
| + | * The Group ID of the file. | ||
| + | * The device ID of the file if it is a device file. | ||
| + | * The size of the file in bytes. | ||
| + | * Timestamps telling when the inode itself was last modified (ctime, inode change time), the file content last modified (mtime, modification time), and last accessed (atime, access time). | ||
| + | * The preferred I/O block size. | ||
| + | * The number of blocks allocated to this file. | ||
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* <code>[[sar -F]]</code> | * <code>[[sar -F]]</code> | ||
* <code>[[df]] -i</code> or <code>[[df --inodes]]</code> | * <code>[[df]] -i</code> or <code>[[df --inodes]]</code> | ||
| − | * <code>[[ls]] | + | * <code>[[ls -i]]</code> |
* [[File descriptor]] | * [[File descriptor]] | ||
| + | * <code>[[stat]]</code> | ||
| + | * <code>[[inotify]]</code> | ||
| + | * <code>[[noatime]]</code> [[mount option]] | ||
| + | * <code>[[inode_readahead_blks]]</code> [[mount option]] | ||
| + | * [[Drop caches]] | ||
== See also == | == See also == | ||
Latest revision as of 10:39, 16 March 2023
filename to inode lookup
Inodes store information about files and directories (folders), such as file ownership, access mode (read, write, execute permissions), and file type.
Within a POSIX system, a file has the following attributes[10] which may be retrieved by the stat system call:
- Device ID (this identifies the device containing the file; that is, the scope of uniqueness of the serial number).
- File serial numbers. (Inode)
- The file mode which determines the file type and how the file's owner, its group, and others can access the file.
- A link count telling how many hard links point to the inode.
- The User ID of the file's owner.
- The Group ID of the file.
- The device ID of the file if it is a device file.
- The size of the file in bytes.
- Timestamps telling when the inode itself was last modified (ctime, inode change time), the file content last modified (mtime, modification time), and last accessed (atime, access time).
- The preferred I/O block size.
- The number of blocks allocated to this file.
Related terms[edit]
sar -Fdf -iordf --inodesls -i- File descriptor
statinotifynoatimemount optioninode_readahead_blksmount option- Drop caches
See also[edit]
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