Editing Ext3 (section)

{{Short description|Journaling file system for Linux}}
{{For|the gene|EXT3 (gene)}}
{{lowercase|title=ext3}}
{{Infobox Filesystem
| name                    = ext3
| full_name               = Third extended file system
| preceded by = [[ext2]]
| succeeded by = [[ext4]]
| developer               = [[Stephen Tweedie]]
| introduction_os         = [[Linux kernel|Linux]] 2.4.15
| introduction_date       = November 2001
| preceded_by             = [[ext2]]
| succeeded_by            = [[ext4]]
| partition_id            = 0x83 ([[Master boot record|MBR]]) <br> [[Basic Data Partition|EBD0A0A2-B9E5-4433-87C0-68B6B72699C7]] ([[GUID Partition Table|GPT]])
| directory_struct        = Table, hashed [[B-tree]] with dir_index enabled
| file_struct             = bitmap (free space), table (metadata)
| bad_blocks_struct       = Table
| max_filename_size       = 255 bytes
| max_files_no            = Variable, allocated at creation time<ref>The maximum number of inodes (and hence the maximum number of files and directories) is set when the file system is created. If ''V'' is the volume size in bytes, then the default number of inodes is given by ''V''/2<sup>13</sup> (or the number of blocks, whichever is less), and the minimum by ''V''/2<sup>23</sup>. The default was deemed sufficient for most applications. The max number of subdirectories in one directory is fixed to 32000.</ref>
| max_volume_size         = 4 [[tebibyte|TiB]] – 32 [[tebibyte|TiB]]
| max_file_size           = 16 [[gibibyte|GiB]] – 2 [[tebibyte|TiB]]
| filename_character_set  = All bytes except [[Null character|NUL]] ('\0') and '/'
| dates_recorded          = modification (mtime), attribute modification (ctime), access (atime)
| date_range              = December 14, 1901 – January 18, 2038
| date_resolution         = 1&nbsp;s
| forks_streams           =
| attributes              = allow-undelete, append-only, h-tree (directory), immutable, journal, no-atime, no-dump, secure-delete, synchronous-write, top (directory)
| file_system_permissions = Unix permissions, [[Access-control_list#POSIX_ACL|POSIX ACLs]] and arbitrary security attributes (Linux 2.6 and later)
| compression             = No
| encryption              = No (provided at the block device level)
| single_instance_storage = No
| OS                      = [[Linux]], [[BSD]], [[ReactOS]],<ref>{{cite web|url=https://reactos.org/project-news/reactos-042-released|title=ReactOS 0.4.2 Released|work=reactos.org|access-date=17 August 2016}}</ref> [[Microsoft Windows|Windows]] (through an [[Installable File System|IFS]])
}}

'''ext3''', or '''third extended filesystem''', is a [[journaling file system|journaled file system]] that is commonly used with the [[Linux kernel]]. It used to be the default [[file system]] for many popular [[Linux distributions]] but generally has been supplanted by its successor version [[ext4]].<ref name=":0">{{Cite web|url=https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Storage_Administration_Guide/ch-ext4.html|title = Chapter 6. The Ext4 File System Red Hat Enterprise Linux 6}}</ref> The main advantage of ext3 over its predecessor, [[ext2]], is [[journaling file system|journaling]], which improves reliability and eliminates the need to check the file system after an unclean or improper [[Shutdown (computing)|shutdown]].