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path: root/fs/ext4/fast_commit.c
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2021-01-15ext4: remove expensive flush on fast commitDaejun Park
In the fast commit, it adds REQ_FUA and REQ_PREFLUSH on each fast commit block when barrier is enabled. However, in recovery phase, ext4 compares CRC value in the tail. So it is sufficient to add REQ_FUA and REQ_PREFLUSH on the block that has tail. Signed-off-by: Daejun Park <daejun7.park@samsung.com> Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20210106013242epcms2p5b6b4ed8ca86f29456fdf56aa580e74b4@epcms2p5 Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2021-01-15ext4: fix wrong list_splice in ext4_fc_cleanupDaejun Park
After full/fast commit, entries in staging queue are promoted to main queue. In ext4_fs_cleanup function, it splice to staging queue to staging queue. Fixes: aa75f4d3daaeb ("ext4: main fast-commit commit path") Signed-off-by: Daejun Park <daejun7.park@samsung.com> Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201230094851epcms2p6eeead8cc984379b37b2efd21af90fd1a@epcms2p6 Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
2021-01-15ext4: use IS_ERR instead of IS_ERR_OR_NULL and set inode null when IS_ERRYi Li
1: ext4_iget/ext4_find_extent never returns NULL, use IS_ERR instead of IS_ERR_OR_NULL to fix this. 2: ext4_fc_replay_inode should set the inode to NULL when IS_ERR. and go to call iput properly. Fixes: 8016e29f4362 ("ext4: fast commit recovery path") Signed-off-by: Yi Li <yili@winhong.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20201230033827.3996064-1-yili@winhong.com Signed-off-by: Theodore Ts'o <tytso@mit.edu> Cc: stable@kernel.org
2020-12-17ext4: make fast_commit.h byte identical with e2fsprogs/fast_commit.hHarshad Shirwadkar
This patch makes fast_commit.h byte by byte identical with e2fsprogs/fast_commit.h. This will help us ensure that there are no on-disk format inconsistencies between e2fsck and kernel ext4. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201120202232.2240293-1-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-12-17ext4: add docs about fast commit idempotenceHarshad Shirwadkar
Fast commit on-disk format is designed such that the replay of these tags can be idempotent. This patch adds documentation in the code in form of comments and in form kernel docs that describes these characteristics. This patch also adds a TODO item needed to ensure kernel fast commit replay idempotence. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201119232822.1860882-1-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-07ext4: fix sparse warnings in fast_commit codeTheodore Ts'o
Add missing __acquire() and __releases() annotations, and make fc_ineligible_reasons[] static, as it is not used outside of fs/ext4/fast_commit.c. Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: make s_mount_flags modifications atomicHarshad Shirwadkar
Fast commit file system states are recorded in sbi->s_mount_flags. Fast commit expects these bit manipulations to be atomic. This patch adds helpers to make those modifications atomic. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-21-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: issue fsdev cache flush before starting fast commitHarshad Shirwadkar
If the journal dev is different from fsdev, issue a cache flush before committing fast commit blocks to disk. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20201106035911.1942128-20-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: disable fast commit with data journallingHarshad Shirwadkar
Fast commits don't work with data journalling. This patch disables the fast commit support when data journalling is turned on. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20201106035911.1942128-19-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: fix inode dirty check in case of fast commitsHarshad Shirwadkar
In case of fast commits, determine if the inode is dirty by checking if the inode is on fast commit list. This also helps us get rid of ext4_inode_info.i_fc_committed_subtid field. Reported-by: Andrea Righi <andrea.righi@canonical.com> Tested-by: Andrea Righi <andrea.righi@canonical.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-18-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: mark buf dirty before submitting fast commit bufferHarshad Shirwadkar
Mark the fast commit buffer as dirty before submission. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-16-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: fix code documentatioonHarshad Shirwadkar
Add a TODO to remember fixing REQ_FUA | REQ_PREFLUSH for fast commit buffers. Also, fix a typo in top level comment in fast_commit.c Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-15-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: dedpulicate the code to wait on inode that's being committedHarshad Shirwadkar
This patch removes the deduplicates the code that implements waiting on inode that's being committed. That code is moved into a new function. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-14-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06jbd2: don't pass tid to jbd2_fc_end_commit_fallback()Harshad Shirwadkar
In jbd2_fc_end_commit_fallback(), we know which tid to commit. There's no need for caller to pass it. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-10-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: clean up the JBD2 API that initializes fast commitsHarshad Shirwadkar
This patch removes jbd2_fc_init() API and its related functions to simplify enabling fast commits. With this change, the number of fast commit blocks to use is solely determined by the JBD2 layer. So, we move the default value for minimum number of fast commit blocks from ext4/fast_commit.h to include/linux/jbd2.h. However, whether or not to use fast commits is determined by the file system. The file system just sets the fast commit feature using jbd2_journal_set_features(). JBD2 layer then determines how many blocks to use for fast commits (based on the value found in the JBD2 superblock). Note that the JBD2 feature flag of fast commits is just an indication that there are fast commit blocks present on disk. It doesn't tell JBD2 layer about the intent of the file system of whether to it wants to use fast commit or not. That's why, we blindly clear the fast commit flag in journal_reset() after the recovery is done. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-7-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: fixup ext4_fc_track_* functions' signatureHarshad Shirwadkar
Firstly, pass handle to all ext4_fc_track_* functions and use transaction id found in handle->h_transaction->h_tid for tracking fast commit updates. Secondly, don't pass inode to ext4_fc_track_link/create/unlink functions. inode can be found inside these functions as d_inode(dentry). However, rename path is an exeception. That's because in that case, we need inode that's not same as d_inode(dentry). To handle that, add a couple of low-level wrapper functions that take inode and dentry as arguments. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-5-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-11-06ext4: mark fc ineligible if inode gets evictied due to mem pressureHarshad Shirwadkar
If inode gets evicted due to memory pressure, we have to remove it from the fast commit list. However, that inode may have uncommitted changes that fast commits will lose. So, just fall back to full commits in this case. Also, rename the fast commit ineligiblity reason from "EXT4_FC_REASON_MEM" to "EXT4_FC_REASON_MEM_NOMEM" for better expression. Suggested-by: Jan Kara <jack@suse.cz> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201106035911.1942128-3-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-28ext4: use IS_ERR() for error checking of pathHarshad Shirwadkar
With this fix, fast commit recovery code uses IS_ERR() for path returned by ext4_find_extent. Fixes: 8016e29f4362 ("ext4: fast commit recovery path") Reported-by: Dan Carpenter <dan.carpenter@oracle.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201027204342.2794949-1-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-28ext4: use s_mount_flags instead of s_mount_state for fast commit stateHarshad Shirwadkar
Ext4's fast commit related transient states should use sb->s_mount_flags instead of persistent sb->s_mount_state. Fixes: 8016e29f4362 ("ext4: fast commit recovery path") Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201027044915.2553163-3-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-28ext4: make num of fast commit blocks configurableHarshad Shirwadkar
This patch reserves a field in the jbd2 superblock for number of fast commit blocks. When this value is non-zero, Ext4 uses this field to set the number of fast commit blocks. Fixes: 6866d7b3f2bb ("ext4/jbd2: add fast commit initialization") Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201027044915.2553163-2-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-28ext4: fix double locking in ext4_fc_commit_dentry_updates()Harshad Shirwadkar
Fixed double locking of sbi->s_fc_lock in the above function as reported by kernel-test-robot. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201023161339.1449437-1-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4: add fast commit stats in procfsHarshad Shirwadkar
This commit adds a file in procfs that tracks fast commit related statistics. root@kvm-xfstests:/mnt# cat /proc/fs/ext4/vdc/fc_info fc stats: 7772 commits 15 ineligible 4083 numblks 2242us avg_commit_time Ineligible reasons: "Extended attributes changed": 0 "Cross rename": 0 "Journal flag changed": 0 "Insufficient memory": 0 "Swap boot": 0 "Resize": 0 "Dir renamed": 0 "Falloc range op": 0 "FC Commit Failed": 15 Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-10-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4: fast commit recovery pathHarshad Shirwadkar
This patch adds fast commit recovery path support for Ext4 file system. We add several helper functions that are similar in spirit to e2fsprogs journal recovery path handlers. Example of such functions include - a simple block allocator, idempotent block bitmap update function etc. Using these routines and the fast commit log in the fast commit area, the recovery path (ext4_fc_replay()) performs fast commit log recovery. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-8-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21jbd2: fast commit recovery pathHarshad Shirwadkar
This patch adds fast commit recovery support in JBD2. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-7-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4: main fast-commit commit pathHarshad Shirwadkar
This patch adds main fast commit commit path handlers. The overall patch can be divided into two inter-related parts: (A) Metadata updates tracking This part consists of helper functions to track changes that need to be committed during a commit operation. These updates are maintained by Ext4 in different in-memory queues. Following are the APIs and their short description that are implemented in this patch: - ext4_fc_track_link/unlink/creat() - Track unlink. link and creat operations - ext4_fc_track_range() - Track changed logical block offsets inodes - ext4_fc_track_inode() - Track inodes - ext4_fc_mark_ineligible() - Mark file system fast commit ineligible() - ext4_fc_start_update() / ext4_fc_stop_update() / ext4_fc_start_ineligible() / ext4_fc_stop_ineligible() These functions are useful for co-ordinating inode updates with commits. (B) Main commit Path This part consists of functions to convert updates tracked in in-memory data structures into on-disk commits. Function ext4_fc_commit() is the main entry point to commit path. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-6-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21jbd2: add fast commit machineryHarshad Shirwadkar
This functions adds necessary APIs needed in JBD2 layer for fast commits. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-5-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-21ext4 / jbd2: add fast commit initializationHarshad Shirwadkar
This patch adds fast commit area trackers in the journal_t structure. These are initialized via the jbd2_fc_init() routine that this patch adds. This patch also adds ext4/fast_commit.c and ext4/fast_commit.h files for fast commit code that will be added in subsequent patches in this series. Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-4-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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