diff --git a/Documentation/filesystems/hpfs.txt b/Documentation/filesystems/hpfs.rst similarity index 66% rename from Documentation/filesystems/hpfs.txt rename to Documentation/filesystems/hpfs.rst index 74630bd504fb..0db152278572 100644 --- a/Documentation/filesystems/hpfs.txt +++ b/Documentation/filesystems/hpfs.rst @@ -1,13 +1,21 @@ +.. SPDX-License-Identifier: GPL-2.0 + +==================== Read/Write HPFS 2.09 +==================== + 1998-2004, Mikulas Patocka -email: mikulas@artax.karlin.mff.cuni.cz -homepage: http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi +:email: mikulas@artax.karlin.mff.cuni.cz +:homepage: http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi -CREDITS: +Credits +======= Chris Smith, 1993, original read-only HPFS, some code and hpfs structures file is taken from it + Jacques Gelinas, MSDos mmap, Inspired by fs/nfs/mmap.c (Jon Tombs 15 Aug 1993) + Werner Almesberger, 1992, 1993, MSDos option parser & CR/LF conversion Mount options @@ -50,6 +58,7 @@ timeshift=(-)nnn (default 0) File names +========== As in OS/2, filenames are case insensitive. However, shell thinks that names are case sensitive, so for example when you create a file FOO, you can use @@ -64,6 +73,7 @@ access it under names 'a.', 'a..', 'a . . . ' etc. Extended attributes +=================== On HPFS partitions, OS/2 can associate to each file a special information called extended attributes. Extended attributes are pairs of (key,value) where key is @@ -88,6 +98,7 @@ values doesn't work. Symlinks +======== You can do symlinks on HPFS partition, symlinks are achieved by setting extended attribute named "SYMLINK" with symlink value. Like on ext2, you can chown and @@ -101,6 +112,7 @@ to analyze or change OS2SYS.INI. Codepages +========= HPFS can contain several uppercasing tables for several codepages and each file has a pointer to codepage its name is in. However OS/2 was created in @@ -128,6 +140,7 @@ this codepage - if you don't try to do what I described above :-) Known bugs +========== HPFS386 on OS/2 server is not supported. HPFS386 installed on normal OS/2 client should work. If you have OS/2 server, use only read-only mode. I don't know how @@ -152,7 +165,8 @@ would result in directory tree splitting, that takes disk space. Workaround is to delete other files that are leaf (probability that the file is non-leaf is about 1/50) or to truncate file first to make some space. You encounter this problem only if you have many directories so that -preallocated directory band is full i.e. +preallocated directory band is full i.e.:: + number_of_directories / size_of_filesystem_in_mb > 4. You can't delete open directories. @@ -174,6 +188,7 @@ anybody know what does it mean? What does "unbalanced tree" message mean? +========================================= Old versions of this driver created sometimes unbalanced dnode trees. OS/2 chkdsk doesn't scream if the tree is unbalanced (and sometimes creates @@ -187,6 +202,7 @@ whole created by this driver, it is BUG - let me know about it. Bugs in OS/2 +============ When you have two (or more) lost directories pointing each to other, chkdsk locks up when repairing filesystem. @@ -199,98 +215,139 @@ File names like "a .b" are marked as 'long' by OS/2 but chkdsk "corrects" it and marks them as short (and writes "minor fs error corrected"). This bug is not in HPFS386. -Codepage bugs described above. +Codepage bugs described above +============================= If you don't install fixpacks, there are many, many more... History +======= -0.90 First public release -0.91 Fixed bug that caused shooting to memory when write_inode was called on - open inode (rarely happened) -0.92 Fixed a little memory leak in freeing directory inodes -0.93 Fixed bug that locked up the machine when there were too many filenames - with first 15 characters same - Fixed write_file to zero file when writing behind file end -0.94 Fixed a little memory leak when trying to delete busy file or directory -0.95 Fixed a bug that i_hpfs_parent_dir was not updated when moving files -1.90 First version for 2.1.1xx kernels -1.91 Fixed a bug that chk_sectors failed when sectors were at the end of disk - Fixed a race-condition when write_inode is called while deleting file - Fixed a bug that could possibly happen (with very low probability) when - using 0xff in filenames - Rewritten locking to avoid race-conditions - Mount option 'eas' now works - Fsync no longer returns error - Files beginning with '.' are marked hidden - Remount support added - Alloc is not so slow when filesystem becomes full - Atimes are no more updated because it slows down operation - Code cleanup (removed all commented debug prints) -1.92 Corrected a bug when sync was called just before closing file -1.93 Modified, so that it works with kernels >= 2.1.131, I don't know if it - works with previous versions - Fixed a possible problem with disks > 64G (but I don't have one, so I can't - test it) - Fixed a file overflow at 2G - Added new option 'timeshift' - Changed behaviour on HPFS386: It is now possible to operate on HPFS386 in - read-only mode - Fixed a bug that slowed down alloc and prevented allocating 100% space - (this bug was not destructive) -1.94 Added workaround for one bug in Linux - Fixed one buffer leak - Fixed some incompatibilities with large extended attributes (but it's still - not 100% ok, I have no info on it and OS/2 doesn't want to create them) - Rewritten allocation - Fixed a bug with i_blocks (du sometimes didn't display correct values) - Directories have no longer archive attribute set (some programs don't like - it) - Fixed a bug that it set badly one flag in large anode tree (it was not - destructive) -1.95 Fixed one buffer leak, that could happen on corrupted filesystem - Fixed one bug in allocation in 1.94 -1.96 Added workaround for one bug in OS/2 (HPFS locked up, HPFS386 reported - error sometimes when opening directories in PMSHELL) - Fixed a possible bitmap race - Fixed possible problem on large disks - You can now delete open files - Fixed a nondestructive race in rename -1.97 Support for HPFS v3 (on large partitions) - Fixed a bug that it didn't allow creation of files > 128M (it should be 2G) +====== ========================================================================= +0.90 First public release +0.91 Fixed bug that caused shooting to memory when write_inode was called on + open inode (rarely happened) +0.92 Fixed a little memory leak in freeing directory inodes +0.93 Fixed bug that locked up the machine when there were too many filenames + with first 15 characters same + Fixed write_file to zero file when writing behind file end +0.94 Fixed a little memory leak when trying to delete busy file or directory +0.95 Fixed a bug that i_hpfs_parent_dir was not updated when moving files +1.90 First version for 2.1.1xx kernels +1.91 Fixed a bug that chk_sectors failed when sectors were at the end of disk + Fixed a race-condition when write_inode is called while deleting file + Fixed a bug that could possibly happen (with very low probability) when + using 0xff in filenames. + + Rewritten locking to avoid race-conditions + + Mount option 'eas' now works + + Fsync no longer returns error + + Files beginning with '.' are marked hidden + + Remount support added + + Alloc is not so slow when filesystem becomes full + + Atimes are no more updated because it slows down operation + + Code cleanup (removed all commented debug prints) +1.92 Corrected a bug when sync was called just before closing file +1.93 Modified, so that it works with kernels >= 2.1.131, I don't know if it + works with previous versions + + Fixed a possible problem with disks > 64G (but I don't have one, so I can't + test it) + + Fixed a file overflow at 2G + + Added new option 'timeshift' + + Changed behaviour on HPFS386: It is now possible to operate on HPFS386 in + read-only mode + + Fixed a bug that slowed down alloc and prevented allocating 100% space + (this bug was not destructive) +1.94 Added workaround for one bug in Linux + + Fixed one buffer leak + + Fixed some incompatibilities with large extended attributes (but it's still + not 100% ok, I have no info on it and OS/2 doesn't want to create them) + + Rewritten allocation + + Fixed a bug with i_blocks (du sometimes didn't display correct values) + + Directories have no longer archive attribute set (some programs don't like + it) + + Fixed a bug that it set badly one flag in large anode tree (it was not + destructive) +1.95 Fixed one buffer leak, that could happen on corrupted filesystem + + Fixed one bug in allocation in 1.94 +1.96 Added workaround for one bug in OS/2 (HPFS locked up, HPFS386 reported + error sometimes when opening directories in PMSHELL) + + Fixed a possible bitmap race + + Fixed possible problem on large disks + + You can now delete open files + + Fixed a nondestructive race in rename +1.97 Support for HPFS v3 (on large partitions) + + ZFixed a bug that it didn't allow creation of files > 128M + (it should be 2G) 1.97.1 Changed names of global symbols + Fixed a bug when chmoding or chowning root directory -1.98 Fixed a deadlock when using old_readdir - Better directory handling; workaround for "unbalanced tree" bug in OS/2 -1.99 Corrected a possible problem when there's not enough space while deleting - file - Now it tries to truncate the file if there's not enough space when deleting - Removed a lot of redundant code -2.00 Fixed a bug in rename (it was there since 1.96) - Better anti-fragmentation strategy -2.01 Fixed problem with directory listing over NFS - Directory lseek now checks for proper parameters - Fixed race-condition in buffer code - it is in all filesystems in Linux; - when reading device (cat /dev/hda) while creating files on it, files - could be damaged -2.02 Workaround for bug in breada in Linux. breada could cause accesses beyond - end of partition -2.03 Char, block devices and pipes are correctly created - Fixed non-crashing race in unlink (Alexander Viro) - Now it works with Japanese version of OS/2 -2.04 Fixed error when ftruncate used to extend file -2.05 Fixed crash when got mount parameters without = - Fixed crash when allocation of anode failed due to full disk - Fixed some crashes when block io or inode allocation failed -2.06 Fixed some crash on corrupted disk structures - Better allocation strategy - Reschedule points added so that it doesn't lock CPU long time - It should work in read-only mode on Warp Server -2.07 More fixes for Warp Server. Now it really works -2.08 Creating new files is not so slow on large disks - An attempt to sync deleted file does not generate filesystem error -2.09 Fixed error on extremely fragmented files +1.98 Fixed a deadlock when using old_readdir + Better directory handling; workaround for "unbalanced tree" bug in OS/2 +1.99 Corrected a possible problem when there's not enough space while deleting + file + Now it tries to truncate the file if there's not enough space when + deleting - vim: set textwidth=80: + Removed a lot of redundant code +2.00 Fixed a bug in rename (it was there since 1.96) + Better anti-fragmentation strategy +2.01 Fixed problem with directory listing over NFS + + Directory lseek now checks for proper parameters + + Fixed race-condition in buffer code - it is in all filesystems in Linux; + when reading device (cat /dev/hda) while creating files on it, files + could be damaged +2.02 Workaround for bug in breada in Linux. breada could cause accesses beyond + end of partition +2.03 Char, block devices and pipes are correctly created + + Fixed non-crashing race in unlink (Alexander Viro) + + Now it works with Japanese version of OS/2 +2.04 Fixed error when ftruncate used to extend file +2.05 Fixed crash when got mount parameters without = + + Fixed crash when allocation of anode failed due to full disk + + Fixed some crashes when block io or inode allocation failed +2.06 Fixed some crash on corrupted disk structures + + Better allocation strategy + + Reschedule points added so that it doesn't lock CPU long time + + It should work in read-only mode on Warp Server +2.07 More fixes for Warp Server. Now it really works +2.08 Creating new files is not so slow on large disks + + An attempt to sync deleted file does not generate filesystem error +2.09 Fixed error on extremely fragmented files +====== ========================================================================= diff --git a/Documentation/filesystems/index.rst b/Documentation/filesystems/index.rst index f776411340cb..3fbe2fa0b5c5 100644 --- a/Documentation/filesystems/index.rst +++ b/Documentation/filesystems/index.rst @@ -69,6 +69,7 @@ Documentation for filesystem implementations. gfs2-uevents hfs hfsplus + hpfs fuse overlayfs virtiofs