platform_external_e2fsprogs/tests/f_end-bitmap, branch master Unnamed repository; edit this file 'description' to name the repository. e2fsck: check and fix tails of all bitmap blocks 2019-05-06T14:15:29+00:00 Theodore Ts'o tytso@mit.edu 2019-05-05T20:43:33+00:00 d0efd17a436aacda85aae86bb6dfed4226a9e0a9 Currently, e2fsck effectively checks only tail of the last inode and block bitmap in the filesystem. Thus if some previous bitmap has unset bits it goes unnoticed. Mostly these tail bits in the bitmap are ignored; however, if blocks_per_group are smaller than 8*blocksize, the multi-block allocator in the kernel can get confused when the tail bits are unset and return bogus free extent. Add support to libext2fs to check these bitmap tails when loading bitmaps (as that's about the only place which has access to the bitmap tail bits) and make e2fsck use this functionality to detect buggy bitmap tails and fix them (by rewriting the bitmaps). Reported-by: Jan Kara <jack@suse.cz> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Jan Kara <jack@suse.cz> 
Currently, e2fsck effectively checks only tail of the last inode and
block bitmap in the filesystem. Thus if some previous bitmap has unset
bits it goes unnoticed.  Mostly these tail bits in the bitmap are
ignored; however, if blocks_per_group are smaller than 8*blocksize,
the multi-block allocator in the kernel can get confused when the tail
bits are unset and return bogus free extent.

Add support to libext2fs to check these bitmap tails when loading
bitmaps (as that's about the only place which has access to the bitmap
tail bits) and make e2fsck use this functionality to detect buggy bitmap
tails and fix them (by rewriting the bitmaps).

Reported-by: Jan Kara <jack@suse.cz>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Jan Kara <jack@suse.cz>
e2fsck: fix mysterious "FILE SYSTEM WAS MODIFIED" with no changes 2011-06-16T05:22:02+00:00 Theodore Ts'o tytso@mit.edu 2011-06-16T05:13:42+00:00 a3efe4842054175d01b465fbe0b29b9be8b800a1 Commit 2a77a784a3 (firest released in e2fsprogs 1.33) compared superblock summary free blocks and inode counts with the allocation bitmap counts before starting the file system check proper, and if they differed, set the superblock and marked it as dirty. If no other file systme changes were required, this would cause a "*** FILE SYSTEM WAS MODIFIED ***" message without any explanation of what e2fsck had changed. We fix this by only setting the superblock summary free block/inodes counts if we are skipping a full check, and in non-preen mode, e2fsck will now print an explicit message stating how the superblock had been updated. In a full check, any updates to the superblock free blocks/inodes fields will be noted in pass5. This change requires changing a few test results (essentially reversing the changes made in commit 2a77a784a3). Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> 
Commit 2a77a784a3 (firest released in e2fsprogs 1.33) compared
superblock summary free blocks and inode counts with the allocation
bitmap counts before starting the file system check proper, and if
they differed, set the superblock and marked it as dirty.  If no other
file systme changes were required, this would cause a "*** FILE SYSTEM
WAS MODIFIED ***" message without any explanation of what e2fsck had
changed.

We fix this by only setting the superblock summary free block/inodes
counts if we are skipping a full check, and in non-preen mode, e2fsck
will now print an explicit message stating how the superblock had been
updated.

In a full check, any updates to the superblock free blocks/inodes
fields will be noted in pass5.

This change requires changing a few test results (essentially
reversing the changes made in commit 2a77a784a3).

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
E2fsck now updates the global free block and 2003-04-06T03:50:44+00:00 Theodore Ts'o tytso@mit.edu 2003-04-06T03:50:44+00:00 2a77a784a327835dbf0c8aa92978f201e44fbc26 inode counters from the block group specific counters quietly. This is needed for an experimental patch which eliminates locking the entire filesystem when allocating blocks or inodes; if the filesystem is not unmounted cleanly, the global counts may not be accurate. 
inode counters from the block group specific counters
quietly.  This is needed for an experimental patch which
eliminates locking the entire filesystem when allocating
blocks or inodes; if the filesystem is not unmounted
cleanly, the global counts may not be accurate.
Many files: 1997-10-03T17:48:10+00:00 Theodore Ts'o tytso@mit.edu 1997-10-03T17:48:10+00:00 1b6bf1759af884957234b7dce768b785f792abd0 pass*.c, super.c: Massive changes to avoid using printf and com_err routines. All diagnostic messages are now routed through the fix_problem interface. pass2.c (check_dir_block): Check for duplicate '.' and '..' entries. problem.c, problem.h: Add new problem codes PR_2_DUP_DOT and PR_2_DUP_DOT_DOT. problem.c: Added new problem codes for some of the superblock corruption checks, and for the pass header messages. ("Pass 1: xxxxx") util.c (print_resource_track): Now takes a description argument. super.c, unix.c, e2fsck.c: New files to separate out the operating-specific operations out from e2fsck.c. e2fsck.c now contains the global e2fsck context management routines, and super.c contains the "pass 0" initial validation of the superblock and global block group descriptors. pass1.c, pass2.c, pass3.c, pass4.c, pass5.c, util.c: Eliminate (nearly) all global variables and moved them to the e2fsck context structure. problem.c, problem.h: Added new problem codes PR_0_SB_CORRUPT, PR_0_FS_SIZE_WRONG, PR_0_NO_FRAGMENTS, PR_0_BLOCKS_PER_GROUP, PR_0_FIRST_DATA_BLOCK expect.1, expect.2: Updated tests to align with e2fsck problem.c changes. 
  pass*.c, super.c: Massive changes to avoid using printf and com_err
  	routines.  All diagnostic messages are now routed through the
  	fix_problem interface.
  pass2.c (check_dir_block): Check for duplicate '.' and '..' entries.
  problem.c, problem.h: Add new problem codes PR_2_DUP_DOT and
  	PR_2_DUP_DOT_DOT.
  problem.c: Added new problem codes for some of the superblock
  	corruption checks, and for the pass header messages.  ("Pass
  	1: xxxxx")
  util.c (print_resource_track): Now takes a description argument.
  super.c, unix.c, e2fsck.c: New files to separate out the
  	operating-specific operations out from e2fsck.c.  e2fsck.c now
  	contains the global e2fsck context management routines, and
  	super.c contains the "pass 0" initial validation of the
  	superblock and global block group descriptors.
  pass1.c, pass2.c, pass3.c, pass4.c, pass5.c, util.c: Eliminate
  	(nearly) all global variables and moved them to the e2fsck
  	context structure.
  problem.c, problem.h: Added new problem codes PR_0_SB_CORRUPT,
  	PR_0_FS_SIZE_WRONG, PR_0_NO_FRAGMENTS, PR_0_BLOCKS_PER_GROUP,
  	PR_0_FIRST_DATA_BLOCK
expect.1, expect.2:
  Updated tests to align with e2fsck problem.c changes.
Many files: 1997-04-29T16:17:09+00:00 Theodore Ts'o tytso@mit.edu 1997-04-29T16:17:09+00:00 19c78dc07fce2d6f39b5e541562afc3ca1ea38ff Checked in e2fsprogs-1.07 
  Checked in e2fsprogs-1.07
Many files: 1997-04-29T14:53:37+00:00 Theodore Ts'o tytso@mit.edu 1997-04-29T14:53:37+00:00 1e3472c5f37ca3686dd69b079d4d02a302f5798d Checked in e2fsprogs 1.05 
  Checked in e2fsprogs 1.05
Many files: 1997-04-26T14:37:06+00:00 Theodore Ts'o tytso@mit.edu 1997-04-26T14:37:06+00:00 74becf3c0a065f8d64e07ce4d31f9fe53be91d62 Checkin of e2fsprogs 1.02. 
  Checkin of e2fsprogs 1.02.
Many files: 1997-04-26T14:00:26+00:00 Theodore Ts'o tytso@mit.edu 1997-04-26T14:00:26+00:00 a418d3ad819323f871005d253f7f9ac378e78ba5 Checked in e2fsprogs 0.5c 
  Checked in e2fsprogs 0.5c