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sysprog21 / simplefs

A simple native file system for Linux kernel
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Implement simplefs_file_open #56

Closed HotMercury closed 2 months ago

HotMercury commented 2 months ago

In the registration of simplefs_file_ops callbacks, there is no open operation, which may lead to creating unexpected space. This commit adds an open operation to handle file truncation when opening files with O_WRONLY, O_RDWR, and O_TRUNC flags. This prevents unintended space allocation by ensuring proper truncation of files.

The implementation checks the flags associated with the file opening mode and performs truncation if the file is being opened for write or read/write and the O_TRUNC flag is set. Truncation is achieved by reading the file's index block from disk, iterating over the data block pointers, releasing the associated data blocks, and updating the inode metadata (size and block count).

Close #55

jserv commented 2 months ago

Thank @HotMercury for contributing!