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It disables the mechanism that detects whether or not a file is compressible and compresses it regardless. (For directories you need the -r flag, else it'll defragment the metadata of the subvolume the directory belongs to). # btrfs filesystem defragment -r -v -czstd / Which command do I want to convert the entire existing file to (default LZO) compression, and to continue compressing any more data that is written to it in the future, without changing the compression of other files on the volume? This seems like it's for forcing compression of files that would not normally be compressed because they contain data that isn't very compressible? Setting the compression property on a file using btrfs property set compression willįorce compression to be used on that file using the specified It's not clear if that will re-compress existing files, though. Will cause new files to be automatically compressed as they come. consider remounting with -o compress, and either rewrite particular files in-place, or run btrfs fi defragment to recompress everything. Otherwise, only new data will be compressed. Using the compress mount option to do so applyĬhattr +c to the file. You will have to run btrfs fi defragment to force recompression of existing data. Tip: Compression can also be enabled per-file without This re-compresses existing files, but seems to be for folders of files, not individual files? Run the following command: # btrfs filesystem defragment -r -v -czstd / To apply compression to existing files, use the btrfs filesystem defragment -c alg command, where algįor example, in order to re-compress the whole file system with zstd, The output file is on a btrfs filesystem, which supports per-file compression, but by which method?
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The Manage Presets dialog box will open, as detailed below. Click Manage to manage saved custom settings.Click Delete to delete selected profiles.
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Saved profiles are detailed in the Settings dropdown menu. Click Save Current Settings to save custom settings for subsequent use.Select a present mode from the list as desired.Note that increasing quality will increase the file size and vice versa.Ĭlick the Settings dropdown menu to toggle between preset modes or save/manage custom settings:įigure 3. Use the Settings dropdown menu to determine the quality of the recompression.Select the Replace when size of new image is smaller than size of original image box to replace recompressed images when they are smaller than the source image used to create them.Select the Replace all instances box to replace all instances of the graphic that is being recompressed in cases where the graphic appears multiple times in the same document.Note that you can click Edit or Reset to edit/reset recompression settings. Select a recompression option in the pane to determine the type of image recompression for the operation.Alternatively, select the Selected Graphic button to recompress only the graphic currently selected in the document. Use the Page Range options to determine the page range of images to be recompressed.Clear this box to disable the Recompress Images dialog box from opening each time the action is used, which is useful when the same settings are used consistently. Select the Show setup dialog while running box to launch the Recompress Images dialog box and customize settings each time this action is used.The Recompress Images dialog box will open, as detailed below. Click All Options to view/edit all options.It contains the following customizable parameters:įigure 1. The Recompress Images action recompresses document images.