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path: root/fs/ext4/mmp.c
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2017-09-14Merge branch 'work.mount' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs Pull mount flag updates from Al Viro: "Another chunk of fmount preparations from dhowells; only trivial conflicts for that part. It separates MS_... bits (very grotty mount(2) ABI) from the struct super_block ->s_flags (kernel-internal, only a small subset of MS_... stuff). This does *not* convert the filesystems to new constants; only the infrastructure is done here. The next step in that series is where the conflicts would be; that's the conversion of filesystems. It's purely mechanical and it's better done after the merge, so if you could run something like list=$(for i in MS_RDONLY MS_NOSUID MS_NODEV MS_NOEXEC MS_SYNCHRONOUS MS_MANDLOCK MS_DIRSYNC MS_NOATIME MS_NODIRATIME MS_SILENT MS_POSIXACL MS_KERNMOUNT MS_I_VERSION MS_LAZYTIME; do git grep -l $i fs drivers/staging/lustre drivers/mtd ipc mm include/linux; done|sort|uniq|grep -v '^fs/namespace.c$') sed -i -e 's/\<MS_RDONLY\>/SB_RDONLY/g' \ -e 's/\<MS_NOSUID\>/SB_NOSUID/g' \ -e 's/\<MS_NODEV\>/SB_NODEV/g' \ -e 's/\<MS_NOEXEC\>/SB_NOEXEC/g' \ -e 's/\<MS_SYNCHRONOUS\>/SB_SYNCHRONOUS/g' \ -e 's/\<MS_MANDLOCK\>/SB_MANDLOCK/g' \ -e 's/\<MS_DIRSYNC\>/SB_DIRSYNC/g' \ -e 's/\<MS_NOATIME\>/SB_NOATIME/g' \ -e 's/\<MS_NODIRATIME\>/SB_NODIRATIME/g' \ -e 's/\<MS_SILENT\>/SB_SILENT/g' \ -e 's/\<MS_POSIXACL\>/SB_POSIXACL/g' \ -e 's/\<MS_KERNMOUNT\>/SB_KERNMOUNT/g' \ -e 's/\<MS_I_VERSION\>/SB_I_VERSION/g' \ -e 's/\<MS_LAZYTIME\>/SB_LAZYTIME/g' \ $list and commit it with something along the lines of 'convert filesystems away from use of MS_... constants' as commit message, it would save a quite a bit of headache next cycle" * 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: VFS: Differentiate mount flags (MS_*) from internal superblock flags VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb) vfs: Add sb_rdonly(sb) to query the MS_RDONLY flag on s_flags
2017-08-24ext4: use sizeof(*ptr)Markus Elfring
Replace the specification of data structures by pointer dereferences as the parameter for the operator "sizeof" to make the corresponding size determination a bit safer according to the Linux coding style convention. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Reviewed-by: Eric Sandeen <sandeen@redhat.com>
2017-07-17VFS: Convert sb->s_flags & MS_RDONLY to sb_rdonly(sb)David Howells
Firstly by applying the following with coccinelle's spatch: @@ expression SB; @@ -SB->s_flags & MS_RDONLY +sb_rdonly(SB) to effect the conversion to sb_rdonly(sb), then by applying: @@ expression A, SB; @@ ( -(!sb_rdonly(SB)) && A +!sb_rdonly(SB) && A | -A != (sb_rdonly(SB)) +A != sb_rdonly(SB) | -A == (sb_rdonly(SB)) +A == sb_rdonly(SB) | -!(sb_rdonly(SB)) +!sb_rdonly(SB) | -A && (sb_rdonly(SB)) +A && sb_rdonly(SB) | -A || (sb_rdonly(SB)) +A || sb_rdonly(SB) | -(sb_rdonly(SB)) != A +sb_rdonly(SB) != A | -(sb_rdonly(SB)) == A +sb_rdonly(SB) == A | -(sb_rdonly(SB)) && A +sb_rdonly(SB) && A | -(sb_rdonly(SB)) || A +sb_rdonly(SB) || A ) @@ expression A, B, SB; @@ ( -(sb_rdonly(SB)) ? 1 : 0 +sb_rdonly(SB) | -(sb_rdonly(SB)) ? A : B +sb_rdonly(SB) ? A : B ) to remove left over excess bracketage and finally by applying: @@ expression A, SB; @@ ( -(A & MS_RDONLY) != sb_rdonly(SB) +(bool)(A & MS_RDONLY) != sb_rdonly(SB) | -(A & MS_RDONLY) == sb_rdonly(SB) +(bool)(A & MS_RDONLY) == sb_rdonly(SB) ) to make comparisons against the result of sb_rdonly() (which is a bool) work correctly. Signed-off-by: David Howells <dhowells@redhat.com>
2016-11-01block,fs: use REQ_* flags directlyChristoph Hellwig
Remove the WRITE_* and READ_SYNC wrappers, and just use the flags directly. Where applicable this also drops usage of the bio_set_op_attrs wrapper. Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-06-07fs: have submit_bh users pass in op and flags separatelyMike Christie
This has submit_bh users pass in the operation and flags separately, so submit_bh_wbc can setup the bio op and bi_rw flags on the bio that is submitted. Signed-off-by: Mike Christie <mchristi@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Hannes Reinecke <hare@suse.com> Signed-off-by: Jens Axboe <axboe@fb.com>
2016-04-27ext4: remove trailing \n from ext4_warning/ext4_error callsJakub Wilk
Messages passed to ext4_warning() or ext4_error() don't need trailing newlines, because these function add the newlines themselves. Signed-off-by: Jakub Wilk <jwilk@jwilk.net>
2016-03-13ext4: clean up error handling in the MMP supportvikram.jadhav07
There is memory leak as both caller function kmmpd() and callee read_mmp_block() not releasing bh_check (i.e buffer_head). Given patch fixes this problem. [ Additional changes suggested by Andreas Dilger -- TYT ] Signed-off-by: Jadhav Vikram <vikramjadhavpucsd2007@gmail.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-10-17ext4: call out CRC and corruption errors with specific error codesDarrick J. Wong
Instead of overloading EIO for CRC errors and corrupt structures, return the same error codes that XFS returns for the same issues. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-08-15ext4: silence a format string false positiveDan Carpenter
Static checkers complain that the format string should be "%s". It does not make a difference for the current code. Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2015-08-15ext4: simplify some code in read_mmp_block()Dan Carpenter
My static check complains because we have: if (!*bh) return -ENOMEM; if (*bh) { The second check is unnecessary. I've simplified this code by moving the "if (!*bh)" checks around. Also Andreas Dilger says we should probably print a warning if sb_getblk() fails. [ Restructured the code so that we print a warning message as well if the mmp block doesn't check out, and to print the error code to disambiguate between the error cases. - TYT ] Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2014-10-13ext4: Replace open coded mdata csum feature to helper functionDmitry Monakhov
Besides the fact that this replacement improves code readability it also protects from errors caused direct EXT4_S(sb)->s_es manipulation which may result attempt to use uninitialized csum machinery. #Testcase_BEGIN IMG=/dev/ram0 MNT=/mnt mkfs.ext4 $IMG mount $IMG $MNT #Enable feature directly on disk, on mounted fs tune2fs -O metadata_csum $IMG # Provoke metadata update, likey result in OOPS touch $MNT/test umount $MNT #Testcase_END # Replacement script @@ expression E; @@ - EXT4_HAS_RO_COMPAT_FEATURE(E, EXT4_FEATURE_RO_COMPAT_METADATA_CSUM) + ext4_has_metadata_csum(E) https://bugzilla.kernel.org/show_bug.cgi?id=82201 Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@vger.kernel.org
2014-05-12ext4: make local functions staticStephen Hemminger
I have been running make namespacecheck to look for unneeded globals, and found these in ext4. Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-11-08ext4: use prandom_u32() instead of get_random_bytes()Theodore Ts'o
Many of the uses of get_random_bytes() do not actually need cryptographically secure random numbers. Replace those uses with a call to prandom_u32(), which is faster and which doesn't consume entropy from the /dev/random driver. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-04-20ext4: mark all metadata I/O with REQ_METATheodore Ts'o
As Dave Chinner pointed out at the 2013 LSF/MM workshop, it's important that metadata I/O requests are marked as such to avoid priority inversions caused by I/O bandwidth throttling. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-04-09ext4: fix big-endian bug in metadata checksum calculationsDmitry Monakhov
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
2013-01-12ext4: use unlikely to improve the efficiency of the kernelWang Shilong
Because the function 'sb_getblk' seldomly fails to return NULL value,it will be better to use 'unlikely' to optimize it. Signed-off-by: Wang Shilong <wangsl-fnst@cn.fujitsu.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2013-01-12ext4: return ENOMEM if sb_getblk() failsTheodore Ts'o
The only reason for sb_getblk() failing is if it can't allocate the buffer_head. So ENOMEM is more appropriate than EIO. In addition, make sure that the file system is marked as being inconsistent if sb_getblk() fails. Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Cc: stable@vger.kernel.org
2012-07-31ext4: Convert to new freezing mechanismJan Kara
We remove most of frozen checks since upper layer takes care of blocking all writes. We have to handle protection in ext4_page_mkwrite() in a special way because we cannot use generic block_page_mkwrite(). Also we add a freeze protection to ext4_evict_inode() so that iput() of unlinked inode cannot modify a frozen filesystem (we cannot easily instrument ext4_journal_start() / ext4_journal_stop() with freeze protection because we are missing the superblock pointer in ext4_journal_stop() in nojournal mode). CC: linux-ext4@vger.kernel.org CC: "Theodore Ts'o" <tytso@mit.edu> BugLink: https://bugs.launchpad.net/bugs/897421 Tested-by: Kamal Mostafa <kamal@canonical.com> Tested-by: Peter M. Petrakis <peter.petrakis@canonical.com> Tested-by: Dann Frazier <dann.frazier@canonical.com> Tested-by: Massimo Morana <massimo.morana@canonical.com> Acked-by: "Theodore Ts'o" <tytso@mit.edu> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2012-04-29ext4: add checksums to the MMP blockDarrick J. Wong
Compute and verify a checksum for the MMP block. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2012-02-27ext4: Fix endianness bug when reading the MMP blockSantosh Nayak
Sparse complained about this endian bug in fs/ext4/mmp.c. Signed-off-by: Santosh Nayak <santoshprasadnayak@gmail.com> Reviewed-by: Johann Lombardi <johann@whamcloud.com> Reviewed-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-10-18ext4: Fix comparison endianness problem in MMP initializationDarrick J. Wong
As part of startup, the MMP initialization code does this: mmp->mmp_seq = seq = cpu_to_le32(mmp_new_seq()); Next, mmp->mmp_seq is written out to disk, a delay happens, and then the MMP block is read back in and the sequence value is tested: if (seq != le32_to_cpu(mmp->mmp_seq)) { /* fail the mount */ On a LE system such as x86, the *le32* functions do nothing and this works. Unfortunately, on a BE system such as ppc64, this comparison becomes: if (cpu_to_le32(new_seq) != le32_to_cpu(cpu_to_le32(new_seq)) { /* fail the mount */ Except for a few palindromic sequence numbers, this test always causes the mount to fail, which makes MMP filesystems generally unmountable on ppc64. The attached patch fixes this situation. Signed-off-by: Darrick J. Wong <djwong@us.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-10-18ext4: MMP: fix error message rate-limiting logic in kmmpdNikitas Angelinas
Current logic would print an error message only once, and then 'failed_writes' would stay at 1. Rework the loop to increment 'failed_writes' and print the error message every s_mmp_update_interval * 60 seconds, as intended according to the comment. Signed-off-by: Nikitas Angelinas <nikitas_angelinas@xyratex.com> Signed-off-by: Andrew Perepechko <andrew_perepechko@xyratex.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> Acked-by: Andreas Dilger <adilger@dilger.ca>
2011-10-18ext4: MMP: kmmpd should use nodename from init_uts_ns.name, not sysnameNikitas Angelinas
sysname holds "Linux" by default, i.e. what appears when doing a "uname -s"; nodename should be used to print the machine's hostname, i.e. what is returned when doing a "uname -n" or "hostname", and what gethostname(2)/sethostname(2) manipulate, in order to notify the administrator of the node which is contending to mount the filesystem. Acked-by: Andreas Dilger <adilger@dilger.ca> Signed-off-by: Nikitas Angelinas <nikitas_angelinas@xyratex.com> Signed-off-by: Andrew Perepechko <andrew_perepechko@xyratex.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
2011-05-24ext4: add support for multiple mount protectionJohann Lombardi
Prevent an ext4 filesystem from being mounted multiple times. A sequence number is stored on disk and is periodically updated (every 5 seconds by default) by a mounted filesystem. At mount time, we now wait for s_mmp_update_interval seconds to make sure that the MMP sequence does not change. In case of failure, the nodename, bdevname and the time at which the MMP block was last updated is displayed. Signed-off-by: Andreas Dilger <adilger@whamcloud.com> Signed-off-by: Johann Lombardi <johann@whamcloud.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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