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jcastillo |
Changes from version 0.5a to version 0.5b
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=========================================
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- Now that we have sysctl(), the immutable flag cannot be changed when
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the system is running at security level > 0.
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- Some cleanups in the code.
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- More consistency checks on directories.
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- The ext2.diff patch from Tom May has been
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integrated. This patch replaces expensive "/" and "%" with
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cheap ">>" and "&" where possible.
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Changes from version 0.5 to version 0.5a
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========================================
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- Zero the partial block following the end of the file when a file
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is truncated.
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- Dates updated in the copyright.
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- More checks when the filesystem is mounted: the count of blocks,
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fragments, and inodes per group is checked against the block size.
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- The buffers used by the error routines are now static variables, to
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avoid using space on the kernel stack, as requested by Linus.
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- Some cleanups in the error messages (some versions of syslog contain
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a bug which truncates an error message if it contains '\n').
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- Check that no data can be written to a file past the 2GB limit.
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- The famous readdir() bug has been fixed by Stephen Tweedie.
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- Added a revision level in the superblock.
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- Full support for O_SYNC flag of the open system call.
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- New mount options: `resuid=#uid' and `resgid=#gid'. `resuid' causes
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ext2fs to consider user #uid like root for the reserved blocks.
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`resgid' acts the same way with group #gid. New fields in the
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superblock contain default values for resuid and resgid and can
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be modified by tune2fs.
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Idea comes from Rene Cougnenc .
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- New mount options: `bsddf' and `minixdf'. `bsddf' causes ext2fs
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to remove the blocks used for FS structures from the total block
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count in statfs. With `minixdf', ext2fs mimics Minix behavior
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in statfs (i.e. it returns the total number of blocks on the
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partition). This is intended to make bde happy :-)
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- New file attributes:
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- Immutable files cannot be modified. Data cannot be written to
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these files. They cannot be removed, renamed and new links cannot
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be created. Even root cannot modify the files. He has to remove
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the immutable attribute first.
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- Append-only files: can only be written in append-mode when writing.
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They cannot be removed, renamed and new links cannot be created.
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Note: files may only be added to an append-only directory.
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- No-dump files: the attribute is not used by the kernel. My port
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of dump uses it to avoid backing up files which are not important.
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- New check in ext2_check_dir_entry: the inode number is checked.
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- Support for big file systems: the copy of the FS descriptor is now
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dynamically allocated (previous versions used a fixed size array).
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This allows to mount 2GB+ FS.
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- Reorganization of the ext2_inode structure to allow other operating
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systems to create specific fields if they use ext2fs as their native
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file system. Currently, ext2fs is only implemented in Linux but
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will soon be part of Gnu Hurd and of Masix.
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Changes from version 0.4b to version 0.5
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========================================
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- New superblock fields: s_lastcheck and s_checkinterval added
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by Uwe Ohse to implement timedependent checks
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of the file system
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- Real random numbers for secure rm added by Pierre del Perugia
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- The mount warnings related to the state of a fs are not printed
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if the fs is mounted read-only, idea by Nick Holloway
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Changes from version 0.4a to version 0.4b
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=========================================
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- Copyrights changed to include the name of my laboratory.
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- Clean up of balloc.c and ialloc.c.
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- More consistency checks.
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- Block preallocation added by Stephen Tweedie.
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- Direct reads of directories disallowed.
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- Readahead implemented in readdir by Stephen Tweedie.
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- Bugs in block and inodes allocation fixed.
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- Readahead implemented in ext2_find_entry by Chip Salzenberg.
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- New mount options:
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`check=none|normal|strict'
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`debug'
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`errors=continue|remount-ro|panic'
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`grpid', `bsdgroups'
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`nocheck'
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`nogrpid', `sysvgroups'
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- truncate() now tries to deallocate contiguous blocks in a single call
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to ext2_free_blocks().
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- lots of cosmetic changes.
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Changes from version 0.4 to version 0.4a
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========================================
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- the `sync' option support is now complete. Version 0.4 was not
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supporting it when truncating a file. I have tested the synchronous
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writes and they work but they make the system very slow :-( I have
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to work again on this to make it faster.
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- when detecting an error on a mounted filesystem, version 0.4 used
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to try to write a flag in the super block even if the filesystem had
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been mounted read-only. This is fixed.
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- the `sb=#' option now causes the kernel code to use the filesystem
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descriptors located at block #+1. Version 0.4 used the superblock
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backup located at block # but used the main copy of the descriptors.
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- a new file attribute `S' is supported. This attribute causes
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synchronous writes but is applied to a file not to the entire file
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system (thanks to Michael Kraehe for
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suggesting it).
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- the directory cache is inhibited by default. The cache management
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code seems to be buggy and I have to look at it carefully before
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using it again.
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- deleting a file with the `s' attribute (secure deletion) causes its
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blocks to be overwritten with random values not with zeros (thanks to
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Michael A. Griffith for suggesting it).
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- lots of cosmetic changes have been made.
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Changes from version 0.3 to version 0.4
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=======================================
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- Three new mount options are supported: `check', `sync' and `sb=#'.
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`check' tells the kernel code to make more consistency checks
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when the file system is mounted. Currently, the kernel code checks
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that the blocks and inodes bitmaps are consistent with the free
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blocks and inodes counts. More checks will be added in future
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releases.
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`sync' tells the kernel code to use synchronous writes when updating
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an inode, a bitmap, a directory entry or an indirect block. This
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can make the file system much slower but can be a big win for files
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recovery in case of a crash (and we can now say to the BSD folks
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that Linux also supports synchronous updates :-).
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`sb=#' tells the kernel code to use an alternate super block instead
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of its master copy. `#' is the number of the block (counted in
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1024 bytes blocks) which contains the alternate super block.
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An ext2 file system typically contains backups of the super block
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at blocks 8193, 16385, and so on.
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- I have change the meaning of the valid flag used by e2fsck. it
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now contains the state of the file system. If the kernel code
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detects an inconsistency while the file system is mounted, it flags
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it as erroneous and e2fsck will detect that on next run.
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- The super block now contains a mount counter. This counter is
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incremented each time the file system is mounted read/write. When
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this counter becomes bigger than a maximal mount counts (also stored
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in the super block), e2fsck checks the file system, even if it had
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been unmounted cleanly, and resets this counter to 0.
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- File attributes are now supported. One can associate a set of
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attributes to a file. Three attributes are defined:
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`c': the file is marked for automatic compression,
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`s': the file is marked for secure deletion: when the file is
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deleted, its blocks are zeroed and written back to the disk,
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`u': the file is marked for undeletion: when the file is deleted,
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its contents are saved to allow a future undeletion.
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Currently, only the `s' attribute is implemented in the kernel
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code. Support for the other attributes will be added in a future
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release.
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- a few bugs related to times updates have been fixed by Bruce
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Evans and me.
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- a bug related to the links count of deleted inodes has been fixed.
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Previous versions used to keep the links count set to 1 when a file
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was deleted. The new version now sets links_count to 0 when deleting
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the last link.
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- a race condition when deallocating an inode has been fixed by
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Stephen Tweedie.
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