If we're shrinking a sparse_super2 filesystem to a single block group,
the superblock will be in block 0. This is perfectly valid (for block
group 0 with a blocksize > 1024) so don't exit.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Fix some gcc-4.8 warnings and other problems that broke the build.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Convert all call sites that write zero blocks to disk to use
ext2fs_zero_blocks2() since it can use Linux's zero out feature to do
the writes more quickly. Reclaim the zero buffer at freefs time and
make the write-zeroes fallback use a larger buffer.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
When shrinking a file system, if the number block groups drops below
the point where we started using the meta_bg layout, disable the
meta_bg feature and set s_first_meta_bg to zero. This is necessary to
avoid creating an invalid/corrupted file system after the shrink.
Addresses-Debian-Bug: #756922
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reported-by: Marcin Wolcendorf <antymat+debian@chelmska.waw.pl>
Tested-by: Marcin Wolcendorf <antymat+debian@chelmska.waw.pl>
There are a number of places where we need convert groups to blocks or
clusters by multiply the groups by blocks/clusters per group.
Unfortunately, both quantities are 32-bit, but the result needs to be
64-bit, and very often the cast to 64-bit gets lost.
Fix this by adding new macros, EXT2_GROUPS_TO_BLOCKS() and
EXT2_GROUPS_TO_CLUSTERS().
This should fix a bug where resizing a 64bit file system can result in
calculate_minimum_resize_size() looping forever.
Addresses-Launchpad-Bug: #1321958
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
When resizing an empty 21T file system to 28T, resize2fs was using
this much CPU time and memory:
216.98user 19.77system 4:02.92elapsed 97%CPU (0avgtext+0avgdata 4485664maxresident)k
8inputs+1068680outputs (0major+800745minor)pagefaults 0swaps
After this one-line change:
222.29user 0.49system 3:48.79elapsed 97%CPU (0avgtext+0avgdata 30080maxresident)k
8inputs+1068552outputs (0major+2497minor)pagefaults 0swaps
So this reduces the max memory utilized from 4.2GB to 29MB!
For future work, the primary place where we are spending the most cpu
time (from resize2fs -d 16) are these two places:
blocks_to_move: Memory used: 2508k/25096k (1903k/606k), time: 91.42/91.53/ 0.00
and
calculate_summary_stats: Memory used: 2508k/25612k (1908k/601k), time: 95.33/95.45/ 0.00
The calculate_summary_stats pass can be sped up by using
ext2fs_find_first_{zero,set}_block_bitmap2(), instead of iterating
over the entire block bitmap one bit at a time.
The blocks_to_move pass can be sped up by using a bitmap to store the
location of fs metadata blocks, to avoid an O(N**2) algorithm where N
is the number of groups in the file system.
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Currently there are many uses of ext2fs_close() which might be wrong.
First of all ext2fs_close() does not set the ext2_filsys pointer to NULL
so the caller is responsible for clearing it, however there are some
cases there we do not do it.
Second of all very small number of users of ext2fs_close() actually
check the return value. If there is a problem in ext2fs_close() it will
not even free the ext2_filsys structure, but majority of users expect it
to do so.
To fix both problems this commit introduces a new helper
ext2fs_close_free() which will not only check for the return value and
free the ext2_filsys structure if the call to ext2fs_close2() failed,
but it will also set the ext2_filsys pointer to NULL.
Replace every use of ext2fs_close() in e2fsprogs tools with
ext2fs_close_free() - there is no real reason to keep using
ext2fs_close().
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
My old patch:
resize2fs: don't print minimum size if fs is not clean
almost did this, but it still calculated the size; it just didn't print
it. Which is a bit silly.
Jes had a pretty badly corrupted image which made the minimum size
calculation go off into the weeds. It was corrupted, and also marked
as having an error.
We'll eventually bail out for an unmounted filesystem if it's marked
as being in an error state anyway; just move that test & bail-out
to a much earlier point, and remove the now-duplicate one under the
print_min_size block.
This will catch & block all resize operations on an offline filesystem
with errors, in one central place.
Reported-by: Jes Sorensen <Jes.Sorensen@redhat.com>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
In reserve_sparse_super2_last_group, the old_desc check should only be
performed if ext2fs_super_and_bgd_loc2() gave us a location -- a
return value of 0 means that there is no old-style GDT block.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Fix some minor bugs relating to passing CFLAGS to cppcheck, and
package the cppcheck output into nicer looking reports.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
In the case where the new location of the inode table is before the
old inode table, the optimization which tries to optimize zero block
moves breaks. Fix it.
This fixes a bug that was tickled by the reproduction described in the
previous commit.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
The previous commit exposed bugs in the calculation for flex_bg file
systems. The problem is that since (by default) we keep the metadata
blocks for the flex_bg in the first block group of the flex_bg, and
because we don't want to overwrite metadata blocks used by the
original file system with data blocks make life easier in case the
resize is aborted for some reason, we need to treat all of the
metadata blocks in the existing flex_bg has in use for the purposes of
calculate_minimum_resize_size().
Even though this means we need to reserve more data blocks to avoid
running out of space, the net result of these two commits is a net
savings in how much we can shrink a file system.
Using the following test sequence:
mke2fs -F -t ext4 /tmp/foo.img 2T
resize2fs -M /tmp/foo.img
resize2fs -M /tmp/foo.img
resize2fs -M /tmp/foo.img
Here is the comparison in the resulting file systems between the old
and new resize2fs (units are in 4k blocks):
resize #1 resize #2 resize #3
old resize2fs 1117186 45679 43536
new resize2fs 48784 37413 37392
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
For extent-mapped file systems, we need to reserve some extra space in
case we need to grow the extent tree. Calculate the safety margin
more intelligently, so we don't overestimate the amount of space
required.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Reported-by: Dmitry Monakhov <dmonakhov@openvz.org>
When we're looking for directory blocks for the inode remapping step,
we need to include inline_data directories in the remap process.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
When we're moving blocks around the filesystem, ensure that freeing
the old blocks only frees the clusters if they're not in use by other
metadata.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
When freeing a block group descriptor block, be careful not to free
metadata clusters belonging to other groups!
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
To check the coverage of e2fsprogs's regression test, do the
following:
configure --enable-gcov
make -j8 ; make -j8 check ; make coverage.txt
The coverage information will be the coverage.txt and *.gcov files in
the build directories.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
ext2fs_free() does not set the ext2_filsys pointer to null so the
caller is responsible to setting it himself if it is needed.
This patch fixes some places where caller did not set ext2_filsys
pointer to NULL after ext2fs_free() which might result in use after
free. Fix it.
Signed-off-by: Lukas Czerner <lczerner@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
In practice, it is **extremely** rare for users to try to use more
than the first backup superblock located at the beginning of block
group #1. (i.e., at block number 32768 for file systems with a 4k
block size). This new compat feature restricts the backup superblock
to block group #1 and the last block group in the file system.
Aside from reducing the overhead of the file system by a small number
of blocks, by eliminating the rest of the backup superblocks, it
allows us to have a much more flexible metadata layout. For example,
we can force all of the allocation bitmaps and inode table blocks to
the beginning of the disk, which allows most of the disk to be
exclusively used for contiguous data blocks.
This simplifies taking advantage of certain HDD specific features,
such as Shingled Magnetic Recording (aka Shingled Drives), and the
TCG's OPAL Storage Specification where having a simple mapping between
LBA block ranges and the data blocks used by the file system can make
life much simpler.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Newer versions of autoconf pull in AC_PROG_GCC as part of
AC_CANONICAL_HOST. So we need check for WITH_DIET_LIBC earlier in
configure.in.
Also, e2fsprogs now needs functions which are found in diet libc's
compat library. So add support for autoconf's LIBS function, and
automatically set libs to include -lcompat.
Finally, disable compiling e4defrag by deault if --with-diet-libc is
specified because the program has too many glibc dependencies.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Mostly by adding static and removing excess extern qualifiers. Also
convert a few remaining non-ANSI function declarations to ANSI.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Compiling with LLVM generates a large number of warnings due
to the use of _() for wrapping strings for i18n:
warning: format string is not a string literal
(potentially insecure) [-Wformat-security]
./nls-enable.h:4:14: note: expanded from macro '_'
#define _(a) (gettext (a))
^~~~~~~~~~~~
These warnings are fixed by using "%s" as the format string,
and then _() is used as the string argument.
Signed-off-by: Andreas Dilger <adilger@dilger.ca>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
With the advent of metadata_csum, we now tie extent and directory
blocks to the associated inode number (and generation). Therefore, we
must be careful when remapping inodes. At that point in the resize
process, all the blocks that are going away have been duplicated
elsewhere in the FS (albeit with checksums based on the old inode
numbers). If we're moving the inode, then do that and remember that
new inode number. Now we can update the block mappings for each inode
with the final inode number, and schedule directory blocks for mass
inode relocation. We also have to recalculate the EA block checksum.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
metadata_csum implies uninit_bg, and in fact forces the bit off for
rocompat with older implementations. Therefore, to detect the
presence of checksums, we should use the predicate function to decide
if group descriptor checksums are turned on, not open-coded flag
tests.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Run sparse against source files when building e2fsprogs with 'make C=1'. If
instead C=2, it configures basic ext2 types for bitwise checking with sparse,
which can help find the (many many) spots where conversion errors are
(possibly) happening.
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
If the file system is being shrunk, and a block group's inode table
falls beyond the end of the inode table, we need to try to relocate
the inode table blocks.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
If the file system's inode table blocks in the last block group are
located in the middle or the end of the block group, it's possible for
resize2fs -M to use a size which will require relocating the inode
table blocks in the last block group. This can lead to all sorts of
problems, so solve it by simply guaranteeing that we will never do
that.
Reported-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Darrick J. Wong