139:. It allows files and directories of separate file systems, known as branches, to be transparently overlaid, forming a single coherent file system. Contents of directories which have the same path within the merged branches will be seen together in a single merged directory, within the new, virtual filesystem.
217:, to layer Docker images. As actions are done to a base image, layers are created and documented, such that each layer fully describes how to recreate an action. This strategy enables Docker's lightweight images, as only layer updates need to be propagated (compared to full VMs, for example).
197:) can be made, where the writable drive has priority over the read-only filesystem. This allows the user to change any of the files on the system, with the new file stored in the image and transparently used instead of the one on the CD.
153:
file systems, so that writes to the virtual, merged copy are directed to a specific real file system. This allows a file system to appear as writable, but without actually allowing writes to change the file system, also known as
243:
written by Miklos
Szeredi has been used in OpenWRT and considered by Ubuntu and has been merged into the mainline Linux kernel on 26 October 2014 after many years of development and discussion for version 3.18 of the kernel.
295:
is a FUSE based union filesystem which offers multiple policies for accessing and writing files as well as other advanced features (xattrs, managing mixed RO and RW drives, link CoW, etc.).
2140:
142:
When mounting branches, the priority of one branch over the other is specified. So when both branches contain a file with the same name, one gets priority over the other.
301:
introduced the first implementation of a stacked, layered file system with copy-on-write, whiteouts (hiding files in lower layers from higher layers), etc. as the
231:
Unionfs for Linux has two versions. Version 1.x is a standalone one that can be built as a module. Version 2.x is a newer, redesigned, and reimplemented one.
700:
2135:
535:
856:
831:
200:
Unionfs can also be used to create a single common template for a number of file systems, or for security reasons. It is sometimes used as an
289:
works like
Unionfs but permits balancing files over drives with the most free space available. It is implemented as a user space filesystem.
790:
2088:
1563:
2078:
1249:
1058:
319:
iOS devices released in July 2011, uses unionfs techniques to speed up the installation process of the operating system modification.
1700:
1366:
1088:
1048:
273:
254:
program, instead of a kernel module or patch. Like
Unionfs, it supports copy-on-write and read-only or read–write branches.
1145:
2083:
1499:
1073:
2145:
2004:
1852:
1784:
1078:
885:
607:
204:
76:
223:, the Linux Terminal Server Project implementation for Ubuntu, uses Unionfs when PXE booting thin or thick clients.
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52:
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1101:
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895:
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735:
Charles P. Wright; Jay Dave; Puja Gupta; Harikesavan
Krishnan; Erez Zadok; Mohammad Nayyer Zubair (2004).
421:
388:
166:
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1894:
1837:
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1553:
1504:
1456:
1356:
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283:
has an implementation of
Unionfs. As of January 2008, it works, but results in a read-only mount-point.
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32:
579:
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2070:
1884:
1614:
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464:
384:
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1999:
1588:
1256:
1197:
1113:
2104:
1966:
1929:
1842:
1568:
1558:
1543:
1484:
1314:
977:
970:
957:
910:
787:
701:"Comex Working on Faster Jailbreaking Process for JailbreakMe 3.0; iPad 2 Jailbreak Coming Soon!"
633:
27:
1919:
1859:
1695:
1381:
1351:
1343:
1212:
1108:
1083:
905:
491:
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194:
95:
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1961:
1469:
863:
794:
1949:
1934:
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923:
158:. This may be desirable when the media is physically read-only, such as in the case of
2129:
1979:
1924:
1598:
1538:
1397:
354:
155:
2043:
1751:
1339:
1306:
1244:
1224:
764:
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136:
1741:
840:
312:
262:
132:
688:. Vol. 1. Interleaf Technical Publishing. 1988. pp. 15‑1–18, 16‑1–19.
2019:
1817:
776:
804:
370:
1974:
1715:
1593:
1324:
1192:
1187:
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756:
328:
266:
240:
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1021:
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280:
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1547:
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1041:
997:
660:
443:
178:
159:
124:
104:
1756:
1665:
1660:
1464:
1165:
760:
737:"Versatility and Unix Semantics in a Fan-Out Unification File System"
584:
182:
128:
108:
770:
557:
2014:
1812:
1797:
1774:
1769:
1764:
1675:
1670:
1608:
1489:
1442:
1437:
1430:
1425:
1420:
1415:
1371:
1361:
1266:
1234:
1128:
1123:
1118:
1014:
942:
890:
306:
120:
100:
59:
727:
1685:
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1635:
1573:
1509:
1479:
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1410:
1405:
1376:
1285:
1276:
1229:
1170:
1140:
1031:
1002:
992:
987:
952:
934:
777:
The new unionfs implementation for FreeBSD and status of merging
417:
392:
333:
234:
214:
193:(knoppix-data.img for Knoppix 7) on a writable drive (such as a
813:
809:
536:"overlayfs merge + leak fix for d_splice_alias() failure exits"
165:
Unionfs was originally developed by Erez Zadok and his team at
1291:
1271:
1160:
1062:
512:
186:
426:
Lab
Coordinator and Principal Investigator: Prof. Erez Zadok
606:
Pendry, Jan-Simon; McKusick, Marshall Kirk (January 1995).
355:"Kernel Korner: Unionfs: Bringing Filesystems Together"
189:
and a file system contained in an image file called
2097:
2069:
2034:
1990:
1908:
1830:
1783:
1729:
1624:
1529:
1455:
1395:
1338:
1305:
872:
580:"unionfs-fuse – A userspace unionfs implementation"
92:
87:
75:
65:
51:
46:
38:
26:
83:No (but can be provided at the block device level)
805:DENX U-Boot and Linux Guide: Overlay File Systems
353:Wright, Charles P.; Zadok, Erez (December 2004).
213:uses file systems inspired by Unionfs, such as
773:– Another FUSE-based implementation of Unionfs
825:
418:"File systems and Storage Lab: CS Department"
405:Project: unionfs-3.9.y.git; Owner: Erez Zadok
8:
767:-based alternative implementation of Unionfs
612:USENIX 1995 Technical Conference Proceedings
385:"Git server of File systems and Storage Lab"
250:is an independent project, implemented as a
21:
2141:File systems supported by the Linux kernel
1912:
1628:
1392:
878:
832:
818:
810:
20:
272:Union mounts have also been available in
181:, a union between the file system on the
490:Georgopoulos, Alkis (24 December 2010).
345:
783:On Incremental File System Development
438:Schulz, Werner P. (15 December 2016).
237:is an alternative version of unionfs.
632:Schwinge, Thomas (26 February 2014).
465:"Docker overview: Union file systems"
145:The different branches may be either
7:
578:Podgorny, Radek (21 November 2016).
534:Torvalds, Linus (26 October 2014).
440:"Hard drive Installation: UNIONFS"
14:
2136:Free special-purpose file systems
556:Corbet, Jonathan (15 June 2011).
16:A filesystem service for Linux
1:
699:Imran, Awais (19 June 2011).
608:"Union Mounts in 4.4BSD-Lite"
788:LUFS-based unionfs for Linux
265:extensively to build custom
119:is a filesystem service for
2005:Filesystem-level encryption
744:Technical Report FSL-04-01b
492:"UbuntuLTSP/LTSPWithoutNFS"
2162:
852:Comparison of file systems
1915:
1631:
881:
847:
1955:Extended file attributes
1656:Compact Disc File System
303:Translucent File Service
2054:Installable File System
269:per user or processes.
42:Unification File System
1102:TiVo Media File System
966:Encrypting File System
793:28 August 2006 at the
748:Stony Brook University
422:Stony Brook University
389:Stony Brook University
261:operating system uses
167:Stony Brook University
1097:Macintosh File System
276:since at least 1995.
259:Plan 9 from Bell Labs
252:user space filesystem
227:Other implementations
33:Open source community
2110:GUID Partition Table
1457:Distributed parallel
1205:Shared File System (
558:"Debating overlayfs"
2115:Apple Partition Map
2061:Virtual file system
2000:Access-control list
1114:NetWare File System
661:"trapexit/mergerfs"
131:which implements a
23:
2146:Union file systems
2105:Master Boot Record
1930:Data deduplication
1569:Google File System
1485:Google File System
971:Extent File System
933:Byte File System (
2123:
2122:
2030:
2029:
1920:Case preservation
1826:
1825:
1525:
1524:
1451:
1450:
1213:Smart File System
114:
113:
96:operating systems
2153:
1940:Execute in place
1913:
1646:Boot File System
1629:
1393:
929:Boot File System
879:
834:
827:
820:
811:
751:
741:
731:
730:
728:Official website
713:
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476:
461:
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429:
428:
414:
408:
407:
402:
400:
391:. Archived from
381:
375:
374:
350:
315:3.0, a tool for
299:Sun Microsystems
195:USB memory stick
24:
2161:
2160:
2156:
2155:
2154:
2152:
2151:
2150:
2126:
2125:
2124:
2119:
2093:
2065:
2049:File system API
2026:
1986:
1962:File change log
1904:
1880:Record-oriented
1853:Self-certifying
1822:
1779:
1725:
1620:
1521:
1447:
1391:
1334:
1301:
874:
868:
864:Unix filesystem
843:
838:
795:Wayback Machine
739:
734:
726:
725:
722:
717:
716:
706:
704:
698:
697:
693:
686:Sun/Release 3.0
684:
683:
679:
669:
667:
659:
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576:
572:
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560:
555:
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538:
533:
532:
528:
518:
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513:"aufs Homepage"
511:
510:
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488:
484:
474:
472:
463:
462:
458:
448:
446:
437:
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415:
411:
398:
396:
395:on 17 June 2016
383:
382:
378:
352:
351:
347:
342:
325:
309:3, circa 1986.
229:
175:
94:
78:
67:
54:
17:
12:
11:
5:
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2092:
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2089:Log-structured
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2067:
2066:
2064:
2063:
2058:
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2056:
2046:
2040:
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2032:
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2028:
2027:
2025:
2024:
2023:
2022:
2017:
2007:
2002:
1996:
1994:
1992:Access control
1988:
1987:
1985:
1984:
1983:
1982:
1977:
1969:
1964:
1959:
1958:
1957:
1950:File attribute
1947:
1942:
1937:
1935:Data scrubbing
1932:
1927:
1922:
1916:
1910:
1906:
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1897:
1892:
1890:Steganographic
1887:
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1872:
1870:Log-structured
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1195:
1193:Reliance Nitro
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1053:Classic Mac OS
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924:Be File System
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721:
720:External links
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2079:Cryptographic
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1399:
1398:wear leveling
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1307:Optical disc
1245:soft updates
1225:Soup (Apple)
875:non-rotating
841:File systems
779:(2007-10-23)
757:unionfs-fuse
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705:. Retrieved
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471:13 July 2017
469:Docker, Inc.
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397:. Retrieved
393:the original
379:
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317:jailbreaking
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263:union mounts
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137:file systems
116:
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28:Developer(s)
18:
2010:Permissions
1625:Specialized
857:distributed
313:JailbreakMe
191:knoppix.img
133:union mount
77:Transparent
68:compression
66:Transparent
55:permissions
53:File system
2130:Categories
2036:Interfaces
2020:Sticky bit
1900:Versioning
1865:Journaling
1808:Rubberhose
1604:SMB (CIFS)
1396:host-side
797:(based on
670:21 October
365:(128): 8.
340:References
267:namespaces
221:UbuntuLTSP
151:read/write
135:for other
79:encryption
1895:Synthetic
1838:Clustered
1785:Encrypted
1716:OverlayFS
1325:ISO 13490
901:Amiga OFS
896:Amiga FFS
634:"unionfs"
371:1075-3583
329:OverlayFS
241:overlayfs
147:read-only
93:Supported
39:Full name
1980:Symbolic
1909:Features
1885:Semantic
1793:eCryptfs
1737:configfs
1706:SquashFS
1594:POHMELFS
1495:OrangeFS
1320:ISO 9660
1240:UFS/UFS2
1188:Reliance
1176:ReiserFS
1022:Files-11
916:bcachefs
873:Disk and
791:Archived
771:FunionFS
639:GNU Hurd
323:See also
293:mergerfs
281:GNU Hurd
207:system.
160:Live CDs
47:Features
2098:Layouts
2084:Default
1747:debugfs
1721:UnionFS
1615:more...
1548:OpenAFS
1516:more...
1181:Reiser4
1151:OpenZFS
1042:HAMMER2
998:ext3cow
978:Episode
707:17 July
645:17 July
617:17 July
591:17 July
563:17 July
541:17 July
519:17 July
497:17 July
475:17 July
449:17 July
444:Knoppix
399:17 July
179:Knoppix
125:FreeBSD
117:Unionfs
105:FreeBSD
22:Unionfs
1971:Links
1945:Extent
1875:Object
1843:Global
1761:specfs
1757:procfs
1752:kernfs
1730:Pseudo
1711:UMSDOS
1666:Davfs2
1661:cramfs
1599:Hadoop
1579:Lustre
1465:BeeGFS
1431:NILFS2
1166:QNX4FS
1129:NILFS2
1037:HAMMER
1027:Fossil
761:GitHub
665:GitHub
585:GitHub
369:
287:mhddfs
211:Docker
202:ad hoc
183:CD-ROM
129:NetBSD
109:NetBSD
2071:Lists
2015:Modes
1860:Flash
1831:Types
1813:SSHFS
1798:EncFS
1775:WinFS
1770:tmpfs
1765:sysfs
1742:devfs
1676:FTPFS
1671:EROFS
1609:SSHFS
1490:OCFS2
1443:UBIFS
1438:YAFFS
1426:NILFS
1421:LogFS
1416:JFFS2
1372:EROFS
1362:exFAT
1267:Xiafs
1250:WAPBL
1235:UBIFS
1146:OneFS
1124:NILFS
1119:Next3
1109:MINIX
1015:exFAT
943:Btrfs
911:AthFS
891:AdvFS
740:(PDF)
307:SunOS
121:Linux
101:Linux
88:Other
60:POSIX
1975:Hard
1967:Fork
1848:Grid
1701:MVFS
1696:NOVA
1691:LTFS
1686:Lnfs
1681:FUSE
1651:CDfs
1641:AXFS
1636:Aufs
1574:GPFS
1559:Coda
1510:Xsan
1500:PVFS
1480:GFS2
1475:CXFS
1470:Ceph
1411:JFFS
1406:CHFS
1387:NVFS
1377:F2FS
1367:TFAT
1352:APFS
1342:and
1286:z/OS
1277:Xsan
1262:WAFL
1257:VxFS
1230:Tux3
1220:SNFS
1202:SFS
1171:ReFS
1141:NTFS
1093:MFS
1079:HTFS
1074:HPFS
1069:HFS+
1032:GPFS
1003:ext4
993:ext3
988:ext2
962:EFS
953:CXFS
948:CVFS
935:z/VM
920:BFS
906:APFS
886:ADFS
799:LUFS
765:FUSE
763:– A
709:2017
672:2018
647:2017
619:2017
593:2017
565:2017
543:2017
521:2017
499:2017
477:2017
451:2017
401:2017
367:ISSN
363:2004
334:Aufs
279:The
257:The
235:aufs
215:Aufs
173:Uses
127:and
107:and
1818:ZFS
1803:EFS
1589:NFS
1584:NCP
1564:DFS
1554:AFP
1544:AFS
1531:NAS
1505:QFS
1382:JFS
1357:FAT
1344:SSD
1330:UDF
1315:HSF
1296:Sun
1292:ZFS
1282:zFS
1272:XFS
1198:RFS
1161:QFS
1156:PFS
1136:NSS
1089:LFS
1084:JFS
1063:MVS
1059:HFS
1049:HFS
1010:FAT
983:ext
958:DFS
759:on
305:in
274:BSD
187:DVD
185:or
177:In
149:or
2132::
1539:9P
1207:VM
746:.
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