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2023-06-27ext4: update doc about journal superblock descriptionZhang Yi1-1/+6
Update the description in doc about the s_head parameter in the journal superblock. Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Link: https://lore.kernel.org/r/20230322013353.1843306-4-yi.zhang@huaweicloud.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2022-06-16ext4, doc: remove unnecessary escapingWang Jianjian1-107/+107
Signed-off-by: Wang Jianjian <wangjianjian3@huawei.com> Link: https://lore.kernel.org/r/20220520022255.2120576-2-wangjianjian3@huawei.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2021-06-23ext4: update journal documentationLeah Rumancik1-8/+31
Add a section about journal checkpointing, including information about the ioctl EXT4_IOC_CHECKPOINT which can be used to trigger a journal checkpoint from userspace. Also, update the journal allocation information to reflect that up to 10240000 blocks are used for the journal and that the journal is not necessarily contiguous. Signed-off-by: Leah Rumancik <leah.rumancik@gmail.com> Changes in v5: - clarify behavior of DRY_RUN flag Link: https://lore.kernel.org/r/20210518151327.130198-3-leah.rumancik@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-12-17ext4: add docs about fast commit idempotenceHarshad Shirwadkar1-0/+50
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: describe fast_commit feature flagsHarshad Shirwadkar1-0/+6
Fast commit feature has flags in the file system as well in JBD2. The meaning of fast commit feature flags can get confusing. Update docs and code to add more documentation about it. 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/20201106035911.1942128-2-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2020-10-22doc: update ext4 and journalling docs to include fast commit featureHarshad Shirwadkar1-0/+66
This patch adds necessary documentation for fast commits. Signed-off-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com> Link: https://lore.kernel.org/r/20201015203802.3597742-2-harshadshirwadkar@gmail.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
2018-10-06docs: promote the ext4 data structures book to top levelDarrick J. Wong1-0/+611
Move the ext4 data structures book to Documentation/filesystems/ext4/ since the administrative information moved elsewhere. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>
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