Hello!
How CephFS calculates the directory size? As I know there is two implementations:
1. Recursive directory traversal like in EXT4 and NTFS
2. Calculation of the directory size by the file system driver and save it as an attribute. In this case, the driver catches adding, deleting and editing files on the fly and changes the size of the directory. In this case there is no need recursive directory traversal.
The directory which we are requesting a size can potentially contain thousands of files at different levels of nesting.
Our components will call the the directory size using the POSIX API. The number of calls of this attribute is will be high and recursive directory traversal is not suitable for us.
Thanks for the answers!
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