| 1 |
199 |
simons |
Changes from version 0.5a to version 0.5b
|
| 2 |
|
|
=========================================
|
| 3 |
|
|
- Now that we have sysctl(), the immutable flag cannot be changed when
|
| 4 |
|
|
the system is running at security level > 0.
|
| 5 |
|
|
- Some cleanups in the code.
|
| 6 |
|
|
- More consistency checks on directories.
|
| 7 |
|
|
- The ext2.diff patch from Tom May has been
|
| 8 |
|
|
integrated. This patch replaces expensive "/" and "%" with
|
| 9 |
|
|
cheap ">>" and "&" where possible.
|
| 10 |
|
|
|
| 11 |
|
|
Changes from version 0.5 to version 0.5a
|
| 12 |
|
|
========================================
|
| 13 |
|
|
- Zero the partial block following the end of the file when a file
|
| 14 |
|
|
is truncated.
|
| 15 |
|
|
- Dates updated in the copyright.
|
| 16 |
|
|
- More checks when the filesystem is mounted: the count of blocks,
|
| 17 |
|
|
fragments, and inodes per group is checked against the block size.
|
| 18 |
|
|
- The buffers used by the error routines are now static variables, to
|
| 19 |
|
|
avoid using space on the kernel stack, as requested by Linus.
|
| 20 |
|
|
- Some cleanups in the error messages (some versions of syslog contain
|
| 21 |
|
|
a bug which truncates an error message if it contains '\n').
|
| 22 |
|
|
- Check that no data can be written to a file past the 2GB limit.
|
| 23 |
|
|
- The famous readdir() bug has been fixed by Stephen Tweedie.
|
| 24 |
|
|
- Added a revision level in the superblock.
|
| 25 |
|
|
- Full support for O_SYNC flag of the open system call.
|
| 26 |
|
|
- New mount options: `resuid=#uid' and `resgid=#gid'. `resuid' causes
|
| 27 |
|
|
ext2fs to consider user #uid like root for the reserved blocks.
|
| 28 |
|
|
`resgid' acts the same way with group #gid. New fields in the
|
| 29 |
|
|
superblock contain default values for resuid and resgid and can
|
| 30 |
|
|
be modified by tune2fs.
|
| 31 |
|
|
Idea comes from Rene Cougnenc .
|
| 32 |
|
|
- New mount options: `bsddf' and `minixdf'. `bsddf' causes ext2fs
|
| 33 |
|
|
to remove the blocks used for FS structures from the total block
|
| 34 |
|
|
count in statfs. With `minixdf', ext2fs mimics Minix behavior
|
| 35 |
|
|
in statfs (i.e. it returns the total number of blocks on the
|
| 36 |
|
|
partition). This is intended to make bde happy :-)
|
| 37 |
|
|
- New file attributes:
|
| 38 |
|
|
- Immutable files cannot be modified. Data cannot be written to
|
| 39 |
|
|
these files. They cannot be removed, renamed and new links cannot
|
| 40 |
|
|
be created. Even root cannot modify the files. He has to remove
|
| 41 |
|
|
the immutable attribute first.
|
| 42 |
|
|
- Append-only files: can only be written in append-mode when writing.
|
| 43 |
|
|
They cannot be removed, renamed and new links cannot be created.
|
| 44 |
|
|
Note: files may only be added to an append-only directory.
|
| 45 |
|
|
- No-dump files: the attribute is not used by the kernel. My port
|
| 46 |
|
|
of dump uses it to avoid backing up files which are not important.
|
| 47 |
|
|
- New check in ext2_check_dir_entry: the inode number is checked.
|
| 48 |
|
|
- Support for big file systems: the copy of the FS descriptor is now
|
| 49 |
|
|
dynamically allocated (previous versions used a fixed size array).
|
| 50 |
|
|
This allows to mount 2GB+ FS.
|
| 51 |
|
|
- Reorganization of the ext2_inode structure to allow other operating
|
| 52 |
|
|
systems to create specific fields if they use ext2fs as their native
|
| 53 |
|
|
file system. Currently, ext2fs is only implemented in Linux but
|
| 54 |
|
|
will soon be part of Gnu Hurd and of Masix.
|
| 55 |
|
|
|
| 56 |
|
|
Changes from version 0.4b to version 0.5
|
| 57 |
|
|
========================================
|
| 58 |
|
|
- New superblock fields: s_lastcheck and s_checkinterval added
|
| 59 |
|
|
by Uwe Ohse to implement timedependent checks
|
| 60 |
|
|
of the file system
|
| 61 |
|
|
- Real random numbers for secure rm added by Pierre del Perugia
|
| 62 |
|
|
|
| 63 |
|
|
- The mount warnings related to the state of a fs are not printed
|
| 64 |
|
|
if the fs is mounted read-only, idea by Nick Holloway
|
| 65 |
|
|
|
| 66 |
|
|
|
| 67 |
|
|
Changes from version 0.4a to version 0.4b
|
| 68 |
|
|
=========================================
|
| 69 |
|
|
- Copyrights changed to include the name of my laboratory.
|
| 70 |
|
|
- Clean up of balloc.c and ialloc.c.
|
| 71 |
|
|
- More consistency checks.
|
| 72 |
|
|
- Block preallocation added by Stephen Tweedie.
|
| 73 |
|
|
- Direct reads of directories disallowed.
|
| 74 |
|
|
- Readahead implemented in readdir by Stephen Tweedie.
|
| 75 |
|
|
- Bugs in block and inodes allocation fixed.
|
| 76 |
|
|
- Readahead implemented in ext2_find_entry by Chip Salzenberg.
|
| 77 |
|
|
- New mount options:
|
| 78 |
|
|
`check=none|normal|strict'
|
| 79 |
|
|
`debug'
|
| 80 |
|
|
`errors=continue|remount-ro|panic'
|
| 81 |
|
|
`grpid', `bsdgroups'
|
| 82 |
|
|
`nocheck'
|
| 83 |
|
|
`nogrpid', `sysvgroups'
|
| 84 |
|
|
- truncate() now tries to deallocate contiguous blocks in a single call
|
| 85 |
|
|
to ext2_free_blocks().
|
| 86 |
|
|
- lots of cosmetic changes.
|
| 87 |
|
|
|
| 88 |
|
|
Changes from version 0.4 to version 0.4a
|
| 89 |
|
|
========================================
|
| 90 |
|
|
- the `sync' option support is now complete. Version 0.4 was not
|
| 91 |
|
|
supporting it when truncating a file. I have tested the synchronous
|
| 92 |
|
|
writes and they work but they make the system very slow :-( I have
|
| 93 |
|
|
to work again on this to make it faster.
|
| 94 |
|
|
- when detecting an error on a mounted filesystem, version 0.4 used
|
| 95 |
|
|
to try to write a flag in the super block even if the filesystem had
|
| 96 |
|
|
been mounted read-only. This is fixed.
|
| 97 |
|
|
- the `sb=#' option now causes the kernel code to use the filesystem
|
| 98 |
|
|
descriptors located at block #+1. Version 0.4 used the superblock
|
| 99 |
|
|
backup located at block # but used the main copy of the descriptors.
|
| 100 |
|
|
- a new file attribute `S' is supported. This attribute causes
|
| 101 |
|
|
synchronous writes but is applied to a file not to the entire file
|
| 102 |
|
|
system (thanks to Michael Kraehe for
|
| 103 |
|
|
suggesting it).
|
| 104 |
|
|
- the directory cache is inhibited by default. The cache management
|
| 105 |
|
|
code seems to be buggy and I have to look at it carefully before
|
| 106 |
|
|
using it again.
|
| 107 |
|
|
- deleting a file with the `s' attribute (secure deletion) causes its
|
| 108 |
|
|
blocks to be overwritten with random values not with zeros (thanks to
|
| 109 |
|
|
Michael A. Griffith for suggesting it).
|
| 110 |
|
|
- lots of cosmetic changes have been made.
|
| 111 |
|
|
|
| 112 |
|
|
Changes from version 0.3 to version 0.4
|
| 113 |
|
|
=======================================
|
| 114 |
|
|
- Three new mount options are supported: `check', `sync' and `sb=#'.
|
| 115 |
|
|
`check' tells the kernel code to make more consistency checks
|
| 116 |
|
|
when the file system is mounted. Currently, the kernel code checks
|
| 117 |
|
|
that the blocks and inodes bitmaps are consistent with the free
|
| 118 |
|
|
blocks and inodes counts. More checks will be added in future
|
| 119 |
|
|
releases.
|
| 120 |
|
|
`sync' tells the kernel code to use synchronous writes when updating
|
| 121 |
|
|
an inode, a bitmap, a directory entry or an indirect block. This
|
| 122 |
|
|
can make the file system much slower but can be a big win for files
|
| 123 |
|
|
recovery in case of a crash (and we can now say to the BSD folks
|
| 124 |
|
|
that Linux also supports synchronous updates :-).
|
| 125 |
|
|
`sb=#' tells the kernel code to use an alternate super block instead
|
| 126 |
|
|
of its master copy. `#' is the number of the block (counted in
|
| 127 |
|
|
1024 bytes blocks) which contains the alternate super block.
|
| 128 |
|
|
An ext2 file system typically contains backups of the super block
|
| 129 |
|
|
at blocks 8193, 16385, and so on.
|
| 130 |
|
|
- I have change the meaning of the valid flag used by e2fsck. it
|
| 131 |
|
|
now contains the state of the file system. If the kernel code
|
| 132 |
|
|
detects an inconsistency while the file system is mounted, it flags
|
| 133 |
|
|
it as erroneous and e2fsck will detect that on next run.
|
| 134 |
|
|
- The super block now contains a mount counter. This counter is
|
| 135 |
|
|
incremented each time the file system is mounted read/write. When
|
| 136 |
|
|
this counter becomes bigger than a maximal mount counts (also stored
|
| 137 |
|
|
in the super block), e2fsck checks the file system, even if it had
|
| 138 |
|
|
been unmounted cleanly, and resets this counter to 0.
|
| 139 |
|
|
- File attributes are now supported. One can associate a set of
|
| 140 |
|
|
attributes to a file. Three attributes are defined:
|
| 141 |
|
|
`c': the file is marked for automatic compression,
|
| 142 |
|
|
`s': the file is marked for secure deletion: when the file is
|
| 143 |
|
|
deleted, its blocks are zeroed and written back to the disk,
|
| 144 |
|
|
`u': the file is marked for undeletion: when the file is deleted,
|
| 145 |
|
|
its contents are saved to allow a future undeletion.
|
| 146 |
|
|
Currently, only the `s' attribute is implemented in the kernel
|
| 147 |
|
|
code. Support for the other attributes will be added in a future
|
| 148 |
|
|
release.
|
| 149 |
|
|
- a few bugs related to times updates have been fixed by Bruce
|
| 150 |
|
|
Evans and me.
|
| 151 |
|
|
- a bug related to the links count of deleted inodes has been fixed.
|
| 152 |
|
|
Previous versions used to keep the links count set to 1 when a file
|
| 153 |
|
|
was deleted. The new version now sets links_count to 0 when deleting
|
| 154 |
|
|
the last link.
|
| 155 |
|
|
- a race condition when deallocating an inode has been fixed by
|
| 156 |
|
|
Stephen Tweedie.
|
| 157 |
|
|
|
