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2011-09-25ext2fs: add multi-mount protection (INCOMPAT_MMP)Andreas Dilger1-17/+42
Multi-mount protection is feature that allows mke2fs, e2fsck, and others to detect if the filesystem is mounted on a remote node (on SAN disks) and avoid corrupting the filesystem. For e2fsprogs this means that it checks the MMP block to see if the filesystem is in use, and marks the filesystem busy while e2fsck is running on the system. This is useful on SAN disks that are shared between high-availability servers, or accessible by multiple nodes that aren't in HA pairs. MMP isn't intended to serve as a primary HA exclusion mechanism, but as a failsafe to protect against user, software, or hardware errors. There is no requirement that e2fsck updates the MMP block at regular intervals, but e2fsck does this occasionally to provide useful information to the sysadmin in case of a detected conflict. For the kernel (since Linux 3.0) MMP adds a "heartbeat" mechanism to periodically write to disk (every few seconds by default) to notify other nodes that the filesystem is still in use and unsafe to modify. Originally-by: Kalpak Shah <kalpak@clusterfs.com> Signed-off-by: Johann Lombardi <johann@whamcloud.com> Signed-off-by: Andreas Dilger <adilger@whamcloud.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2011-09-16libext2s: fix swapfs.c so it builds on big endian systemsTheodore Ts'o1-3/+2
Also cleaned up ext2_fs.h, and improved the byte swapping code so the extra fields in the large inode are properly byte swapped. Addresses-Debian-Bug: #641838 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-09-16debugfs: add 64-bit support to the set_field commandsTheodore Ts'o1-1/+1
The set_fields commands (set_super_value, set_inode_field, set_block_group) now handle fields which store in split fields on ext4's on-disk format. For example, the superblock fields s_blocks_count and s_blocks_count_hi. The user can either set the low or high part of the field via "blocks_count_lo" or "blocks_count_hi", or both parts can be set via "blocks_count". Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-09-16libext2fs: add metadata checksum and snapshot feature flagsTheodore Ts'o1-9/+22
Reserve EXT4_FEATURE_RO_COMPAT_METADATA_CSUM and EXT2_FEATURE_COMPAT_EXCLUDE_BITMAP. Also reserve fields in the superblock and the inode for the checksums. In the block group descriptor, reserve the exclude bitmap field for the snapshot feature, and checksums for the inode and block allocation bitmaps. With this commit, the metadata checksum and exclude bitmap features should have reserved all of the fields they need in ext4's on-disk format. This commit also fixes an a missing byte swap for s_overhead_blocks. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: Darrick J. Wong <djwong@us.ibm.com> Cc: Amir Goldstein <amir73il@gmail.com>
2011-09-16Merge branch 'maint' into nextTheodore Ts'o1-0/+12
2011-09-15libext2fs: fix binary and source compatibility with the dump programTheodore Ts'o1-0/+12
The dump program relies on fs->frag_size and the EXT2_FRAGS_PER_BLOCK() macro. Kind of silly for it to do so, but it's part of the kludgy way the dump program (which was originally written for the BSD FFS was ported over to support ext2/3.) Given how it makes assumptions about the ext2/3/4 file system being similar to the BSD FFS, it's a bit of a miracle it works for ext4 --- or at least appears to work... Addresses-Debian-Bug: #636418 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-09-14resize2fs: add support for new in-kernel online resize ioctlYongqiang Yang1-0/+1
This is needed to support online resizing for > 32-bit file systems Signed-off-by: Yongqiang Yang <xiaoqiangnk@gmail.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-07-07libext2fs: Fix gcc -Wall warningsTheodore Ts'o1-3/+4
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-06-04Merge branch 'maint' into nextTheodore Ts'o1-1/+5
Conflicts: lib/ext2fs/bitmaps.c lib/ext2fs/rw_bitmaps.c misc/dumpe2fs.c
2011-06-04libext2fs: change EXT2_MAX_BLOCKS_PER_GROUP() to be cluster size awareTheodore Ts'o1-1/+5
Change the EXT2_MAX_BLOCKS_PER_GROUP so that it takes the cluster size into account. This way we can open bigalloc file systems without ext2fs_open() thinking that they are corrupt. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-03-18Merge branch 'maint' into nextTheodore Ts'o1-2/+3
Conflicts: lib/e2p/ls.c
2011-03-18add new superblock field: s_overhead_blocksTheodore Ts'o1-2/+3
It turns out that it's very hard to calculate overheads in the face of clustered allocation (bigalloc). This is because multiple metadata blocks from different block groups can end up in the same allocation cluster. Calculating the exact overhead requires O(all block bitmaps) in memory, or O(number of block groups**2) in time. So we will calculate this at mkfs time and stash it in the superblock. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-27Merge branch 'maint' into nextTheodore Ts'o1-17/+17
Conflicts: lib/ext2fs/initialize.c
2011-02-25Add basic BIGALLOC support for cluster-based allocationTheodore Ts'o1-14/+11
This adds the superblock fields needed so that dumpe2fs works and the code points and renames the superblock fields from describing fragments to clusters. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-02-25e2fsprogs: reserving code points for new ext4 quota featureAditya Kali1-3/+6
This patch adds support for detecting the new 'quota' feature in ext4. The patch reserves code points for usr and group quota inodes and also for the feature flag EXT4_FEATURE_RO_COMPAT_QUOTA. Signed-off-by: Aditya Kali <adityakali@google.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2010-09-24Merge branch 'maint' into nextTheodore Ts'o1-2/+7
Conflicts: configure configure.in lib/ext2fs/ext2fs.h misc/mke2fs.c
2010-09-18tune2fs, debugfs, libext2fs: Add support for ext4 default mount optionsTheodore Ts'o1-2/+7
Add support for 2.6.35's new default mount options which can be specified in the superblock. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-07-19Merge branch 'maint' into nextTheodore Ts'o1-1/+22
Conflicts: resize/extent.c
2010-07-05Add superblock fields which track first and most recent fs errorsTheodore Ts'o1-1/+22
Add superblock fields which track where and when the first and most recent file system errors occured. These fields are displayed by dumpe2fs and cleared by e2fsck. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-06-07Merge branch 'maint' into nextTheodore Ts'o1-1/+18
Conflicts: e2fsck/journal.c e2fsck/pass1.c e2fsck/pass2.c misc/mke2fs.c
2010-06-02Reserve feature flags and fields needed for the Next3 snapshot featureTheodore Ts'o1-1/+15
The documentation is not (as of this writing) fully complete, but there is some documentation here: http://sourceforge.net/apps/mediawiki/next3/index.php?title=Code_documentation http://sourceforge.net/apps/mediawiki/next3/index.php?title=On-disk_format http://sourceforge.net/projects/next3/files/Next3_Snapshots.pdf/download ... which will hopefully be updated soon to be fully up to date with these assignments and more details about how things work. For now, the assignments should avoid collisions with other new work that people might want to do on ext3/4. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-06-02Reserve the EXT4_FEATURE_INCOMPAT_DIRDATA feature flagAndreas Dilger1-0/+1
Reserve the EXT4_FEATURE_INCOMPAT_DIRDATA feature flag for adding extra file data in ext2_dir_entry_2 entries. This changes the on-disk layout in the following way. Firstly, the ext2_dir_entry_2 file_type field now has a mask: that limits the "filetype" information to the low 4 bits of this field. Since these values are sequentially assigned, this allows for up to 7 more filetypes to be assigned. When reading the "filetype" field, the high 4 bits should be masked off when converting to DT_* filetypes for userspace. The high 4 bits of "filetype" are used as a bitmask to register up to 4 different "extended" directory entry fields. Extended data fields are packed without alignment into the directory entry after the "name" field in order of increasing bitmask value, for each field where bit is set. In order to avoid the need to "understand" each of the extended fields, the first byte of each extended data field holds the size of that data field (including the size itself), so they can be skipped if not understood. For fields that change the semantics of the filesystem it is expected that a separate ROCOMPAT or INCOMPAT field is registered. There is a single dirent data type defined currently, for Lustre: which holds a 128-bit file identifier. It is expected that if there are 64-bit inode values that this will be assigned the 0x20 value. Should a need ever arise to use all 4 of the extended dirent data fields, it would be possible to keep the last bit (0x80) for use as a multiplexor that stores a 1-byte aggregate data size, then a series of "<u8_size><u8_type><data>" records in the last extended data record. It is not expected that this will actually be needed in the lifetime of ext4. Signed-off-by: Andreas Dilger <adilger@sun.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-06-02Reserve the EXT4_INCOMPAT_EA_INODE feature flagAndreas Dilger1-0/+2
Reserve the EXT4_INCOMPAT_EA_INODE feature flag for use with large extended attributes that are stored in a separate inode. This changes the on-disk format in several ways: First, replace the e_value_block field with e_value_inum, so that an xattr entry can reference an external inode. This field is currently unused, as all of the entries live in the same block. struct ext2_ext_attr_entry { __u8 e_name_len; /* length of name */ __u8 e_name_index; /* attribute name index */ __le16 e_value_offs; /* offset in disk block of value */ > __le32 e_value_inum; /* inode in which the value is stored */ __le32 e_value_size; /* size of attribute value */ __le32 e_hash; /* hash value of name and value */ char e_name[0]; /* attribute name */ } Second, add a flag to the inode that indicates it is using a large (external) extended attribute. This is needed so that when unlinking an inode the xattrs will be scanned to unlink the xattr inodes referenced by the main inode. Third, for inodes that have a number of xattrs that are larger than a single block, but not large enough to justify an external inode (less than 64kB total xattr size, due to e_value_offs limitation) the ext2_ext_attr_header->h_blocks field can grow beyond a single block to represent a contiguous allocation of blocks for the xattr. Signed-off-by: Andreas Dilger <adilger@sun.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2010-03-15Merge branch 'maint' into nextTheodore Ts'o1-2/+3
2010-02-24e2fsck: don't complain about i_size for known blocks past EOFEric Sandeen1-2/+3
This is the userspace side of Jiaying's EOFBLOCKS patch. With Aneesh's patches for .33, Jiaying's patch, and this one, xfstests 013/fsstress (even with direct IO enabled) has held up through many runs. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2009-09-07Use ext2fs_file_acl_block() instead of using .i_file_acl directlyValerie Aurora Henson1-3/+3
This provides support for 48-bit file acl blocks. Signed-off-by: Valerie Aurora Henson <vaurora@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2009-06-06libext2fs: Define bg_itable_unused_hi in the ext4_group_desc structureValerie Aurora Henson1-4/+7
Signed-off-by: Valerie Aurora Henson <vaurora@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2009-03-06Add support for a new superblock field: s_kbytes_writtenTheodore Ts'o1-1/+2
This field tracks the lifetime amount of writes to the filesystem. It will be updated by the kernel as well as by e2fsprogs programs which write to the filesystem. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-08-27Remove trailing whitespace for the entire source treeTheodore Ts'o1-1/+1
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-06-07resize2fs: Add support to use the ext4 online resize ioctl'sTheodore Ts'o1-0/+11
First try the ext3 ioctl, but if we get an error, try using the ext4 ioctl. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-05-15ext2fs.h: Add l_i_file_acl_high and l_version_hi to on-disk inode structureTheodore Ts'o1-2/+3
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-04-22Basic flexible block group supportTheodore Ts'o1-1/+4
Add superblock definition, and dumpe2fs and debugfs support. Signed-off-by: Jose R. Santos <jrs@us.ibm.com> Signed-off-by: Valerie Clement <valerie.clement@bull.net> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2008-04-17Add support for the HUGE_FILE featureTheodore Ts'o1-0/+1
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-03-20Add initial checksum support for the gdt_checksum/uninit_group featureJose R. Santos1-0/+1
- Add support for computing CRC-16 value. - Add call to check/verify/set csum on block_groups. - Add a test program to verify csum operations. Signed-off-by: Jose R. Santos <jrs@us.ibm.com> Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-03-15Add support for the DIR_NLINK feature.Andreas Dilger1-0/+1
This patch includes the changes required to e2fsck to understand the nlink count changes made in the kernel. In e2fsck pass 4, when we fetch the actual link count, if it is exceeds 65,000 we set the link count to 1. We silently fix the situation where the nlink count of the directory is 1, and there are fewer than 65,000 subdirectories, since since that can happen naturally. Patch originally from CFS, significantly rewritten by Theodore Ts'o. Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Kalpak Shah <kalpak@clusterfs.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-03-15Merge branch 'maint'Theodore Ts'o1-1/+1
2008-03-15ext2_fs.h: Rename EXT4_ORPHAN_FS to be EXT3_ORPHAN_FSTheodore Ts'o1-1/+1
No application will ever use the ORPHAN_FS flag, since it only shows up in kernel memory, but it's been pointed out it was first used in ext3, and so it should be renamed for accuracy. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-01-27Merge branch 'maint' into nextTheodore Ts'o1-0/+4
Conflicts: configure lib/ext2fs/ext2_fs.h misc/e2image.c
2008-01-26Add support for the test_fs flagTheodore Ts'o1-0/+2
The test_fs flag is an "ok to be used with test kernel code" flag. It makes it easier for us to determine whether a filesystem should be mounted using ext4 or not. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-01-21Define helper functions ext2fs_set_i_{u,g}id_high() for MacOS compatibilityTheodore Ts'o1-0/+5
This is needed for all non-Linux/Hurd/Masix systems... Addresses-Sourceforge-Bug: #1863819 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2008-01-01Merge branch 'maint' into nextTheodore Ts'o1-4/+7
Conflicts: configure debian/rules e2fsck/swapfs.c lib/ext2fs/ext2_fs.h
2008-01-01Fix build failure on non-Linux/non-Hurd/non-Masix systemsTheodore Ts'o1-2/+2
The previous fix didn't quite work, but this one should! Addresses-Sourceforge-Bug: #1861633 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2007-12-31Fix build failure on non-Linux/non-Hurd/non-Masix systemsTheodore Ts'o1-6/+8
inode_uid() and inode_gid() weren't getting defined on systems that were not Linux, Hurd, or Masix. Addresses-Sourceforge-Bug: #1859778 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2007-12-17Add #define needed for Hurd ioctl definitionsTheodore Ts'o1-0/+4
Addresses-Debian-Bug: #437720 Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2007-11-03Merge basic FLEX_BG supportTheodore Ts'o1-0/+1
Merge commit 'c2d4300b8a4a13d8a78b86c386f76259f23feec2' into next
2007-11-03Reserve the INCOMPAT feature number for FLEX_BG.Jose R. Santos1-0/+1
Signed-off-by: Jose R. Santos <jrs@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> -- lib/ext2fs/ext2_fs.h | 1 + 1 files changed, 1 insertions(+), 0 deletions(-)
2007-11-01libext2fs: remove masix supportColy Li1-30/+1
This patch remove masix support from lib/ext2fs. Signed-off-by: Coly Li <coyli@suse.de>
2007-10-14libext2fs: Add EXT2_DESC_SIZE and EXT2_DESC_PER_BLOCK macrosValerie Clement1-1/+8
Add macros to support variable-length group descriptors for ext4. Signed-off-by: Valerie Clement <valerie.clement@bull.net> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2007-05-31Reserve superblock field for the raid stripe width.Theodore Ts'o1-1/+2
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2007-05-31Reserve superblock fields for multiple mount protection featureAndreas Dilger1-2/+29
There have been reported instances of a filesystem having been mounted at 2 places at the same time causing a lot of damage to the filesystem. This patch reserves superblock fields and an INCOMPAT flag for adding multiple mount protection(MMP) support within the ext4 filesystem itself. The superblock will have a block number (s_mmp_block) which will hold a MMP structure which has a sequence number which will be periodically updated every 5 seconds by a mounted filesystem. Whenever a filesystem will be mounted it will wait for s_mmp_interval seconds to make sure that the MMP sequence does not change. To further make sure, we write a random sequence number into the MMP block and wait for another s_mmp_interval secs. If the sequence no. doesn't change then the mount will succeed. In case of failure, the nodename, bdevname and the time at which the MMP block was last updated will be displayed. tune2fs can be used to set s_mmp_interval as desired. Signed-off-by: Andreas Dilger <adilger@clusterfs.com> Signed-off-by: Kalpak Shah <kalpak@clusterfs.com>
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