Difference between revisions of "Translations:Btrfs/122/en"

Latest revision as of 08:10, 2 June 2023

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Message definition (Btrfs)

=== Copy on Write! (Btrfs)===
Copy on Write is a "new" concept. It means the file system will try to '''never''' write over existing data. '''How is this even possible?'''
* Files are appended at the end of a "data page"
* Metadata is appended at a "metadata page"
* Inside a page '''nothing is ever overwritten'''
* When a page is full the file system will use the next free page
* Deleting a file does not write/clean its data, but writes metadata, that marks this file as deleted
* Overwriting a file does first append the new file to the actual "data page", then appends the metadata for this file to the "metadata page".
* Changing small parts of a file will write only the new parts, then ''link'' the rest to the old file
* there are checksums for data and metadata

=== Copy on Write! (Btrfs)===
Copy on Write is a "new" concept. It means the file system will try to '''never''' write over existing data. '''How is this even possible?'''
* Files are appended at the end of a "data page"
* Metadata is appended at a "metadata page"
* Inside a page '''nothing is ever overwritten'''
* When a page is full the file system will use the next free page
* Deleting a file does not write/clean its data, but writes metadata, that marks this file as deleted
* Overwriting a file does first append the new file to the actual "data page", then appends the metadata for this file to the "metadata page".
* Changing small parts of a file will write only the new parts, then ''link'' the rest to the old file
* there are checksums for data and metadata

Copy on Write! (Btrfs)

Copy on Write is a "new" concept. It means the file system will try to never write over existing data. How is this even possible?

Files are appended at the end of a "data page"
Metadata is appended at a "metadata page"
Inside a page nothing is ever overwritten
When a page is full the file system will use the next free page
Deleting a file does not write/clean its data, but writes metadata, that marks this file as deleted
Overwriting a file does first append the new file to the actual "data page", then appends the metadata for this file to the "metadata page".
Changing small parts of a file will write only the new parts, then link the rest to the old file
there are checksums for data and metadata