Since the beginning of the uninit_bg feature, the kernel[1] and
e2fsck[2] have always been careful to detect the presence of the
BLOCK_UNINIT flag, and compute a block bitmap with any group metadata
blocks marked in that bitmap. With that in mind, I think it's safe to
say that this is a design feature of uninit_bg.
Now that we've trained libext2fs to have this same behavior whenever
it's loading a block bitmap, we no longer need to unset BLOCK_UNINIT
for a group that contains only its own group metadata -- kernel,
e2fsck, and e2fsprogs will handle this correctly.
[1] kernel git 717d50e4971b81b96c0199c91cdf0039a8cb181a
"Ext4: Uninitialized Block Groups"
[2] e2fsprogs git f5fa20078b
"Add support for EXT2_FEATURE_COMPAT_LAZY_BG"
Reported-by: Akira Fujita <a-fujita@rs.jp.nec.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Use ext2fs_[un]mark_block_range2() functions to reduce the CPU
overhead of resizing large file systems by 45%, primarily by
reducing the time spent in fix_uninit_block_bitmaps().
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
The DEFS line in MCONFIG had gotten so long that it exceeded 4k, and
this was starting to cause some tools heartburn. It also made "make
V=1" almost useless, since trying to following the individual commands
run by make was lost in the noise of all of the defines.
So fix this by putting the configure-generated defines in lib/config.h
and the directory pathnames to lib/dirpaths.h.
In addition, clean up some vestigal defines in configure.in and in the
Makefiles to further shorten the cc command lines.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Code to count the number of blocks in the last partial
group is cut and pasted around the e2fsprogs codebase
a few times.
Making this a helper function should improve matters.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Filesystems with a blocksize of 1024 have the superblock starting at
block #1. However, the first data block in the superblock is 0 to
simplify the cluster calculations. So we must compensate for this in
a number of places, mostly in the ext2fs library, but also in e2fsck.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
The top-level COPYING file states that the e2p and ext2fs libraries
are available under the LGPLv2. The files were incorrectly labelled.
Alex Thomas/Luster has been consulted wrt to the ext3_extents.h file;
the rest of the files were primarily authored by Theodore Ts'o.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
The ext2fs_bg_flag* functions were confusing.
Currently we have this:
void ext2fs_bg_flags_set(ext2_filsys fs, dgrp_t group, __u16 bg_flags);
void ext2fs_bg_flags_clear(ext2_filsys fs, dgrp_t group,__u16 bg_flags);
(_set (unused) sets exactly bg_flags; _clear clears all and ignores bg_flags)
and these, which can twiddle individual bits in bg_flags:
void ext2fs_bg_flag_set(ext2_filsys fs, dgrp_t group, __u16 bg_flag);
void ext2fs_bg_flag_clear(ext2_filsys fs, dgrp_t group, __u16 bg_flag);
A better interface, after the patch below, is just:
ext2fs_bg_flags_zap(fs, group) /* zeros bg_flags */
ext2fs_bg_flags_set(fs, group, flags) /* adds flags to bg_flags */
ext2fs_bg_flags_clear(fs, group, flags) /* clears flags in bg_flags */
and remove the original ext2fs_bg_flags_set / ext2fs_bg_flags_clear.
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
The new ext2fs_super_and_bgd_loc2() function has some changes aside
from just blk64_t support. Lets make sure that the interfaces are
sane by adding libext2fs support early to get the new API tested here.
Signed-off-by: Jose R. Santos <jrs@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
E2fsck could to do more damage to a filesystem by trying to relocate
inode tables due to corrupted block group descriptors, and the
relocation could seriously damage the filesystem.
This patch enhances ext2fs_check_desk() so it detects more
self-inconsistent block group descriptors, including the cases where
e2sck might be tempted to relocate the inode table, and reports the
block group descriptors as invalid; this will cause e2fsck to attempt
to use the backup superblocks, which hopefully have not been trashed.
Addresses-Sourceforge-Bug: #1840291
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Mke2fs used to have special case, ugly code in
setup_lazy_bg/setup_uninit_bg flag which set the flags based on all
sorts of special cases. Change it so that it is done in libext2fs,
and fix mke2fs to use alloc_stats functions which will take care of
clearing the *_UNINIT flags automatically as needed.
This is preparatory work to make the flex_bg allocation patch much
cleaner.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Add an explanation of exactly what ext2fs_super_and_bgd_loc() and
ext2fs_reserve_super_and_bgd_loc() do, and more importantly, exactly
what they return. Note that most callers should *not* rely on the
return value since it's rarely useful, especially once the flex_bg
feature is enabled and inode table and allocation bitmap blocks may
not be in the block group.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
the superblock and block group descriptors into two functions:
ext2fs_reserve_super_and_bgd, found in lib/ext2fs/alloc_sb.c, and
ext2fs_super_and_bgd_lock, found in lib/ext2fs/close.c.
Change e2fsck/pass1.c (mark_table_blocks), lib/ext2fs/closefs.c
(ext2fs_flush), lib/ext2fs/initialize.c (ext2fs_initialize),
and misc/dumpe2fs.c (list_desc) to use these functions.
e2fsck/ChangeLog
pass1.c (mark_table_blocks): Use the new function
ext2fs_reserve_super_and_bgd to calculate the blocks to be
reserved.
lib/ext2fs/ChangeLog
closefs.c (ext2fs_super_and_bgd_loc): New function which
centralizes the calculation of the superblock and block
group descriptors.
(ext2fs_flush): Use ext2fs_super_and_bgd_lock to figure
out where to write the superblock and block group
descriptors.
alloc_sb.c (ext2fs_reserve_super_and_bgd): New function which
reserves space in the block bitmap using
ext2fs_super_and_bgd_loc.
initialize.c (ext2fs_initialize): Use
ext2fs_reserve_super_and_bgd to initialize the block bitmap.
misc/ChangeLog
dumpe2fs.c (list_desc): Use ext2fs_super_and_bgd_loc to
determine the locations of the superblock and block group
descriptors.
Darrick J. Wong