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Summary of Changes
Hello @anglov, I'm Gemini Code Assist1! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!
This pull request implements a change in the meterfs file system to ensure that all file IDs are 1-based instead of 0-based. The primary motivation is to mitigate hard-to-identify errors that can arise when using static file descriptor tables initialized to zero, by making the first valid file ID non-zero. This change affects how file IDs are generated and validated within the system.
Highlights
- File ID Shifting: Modified the
meterfs_rbTreeFillandmeterfs_allocateFilefunctions inmeterfs.cto ensure that all file IDs are assigned starting from 1 instead of 0. This is achieved by adding+ 1to the calculated file ID during both initial tree population and new file allocation. - Zero ID Assertion: Added an
assert(id != 0);check at the beginning of thenode_addfunction inmeterfs/node.c. This explicitly prevents the use of file ID 0, reinforcing the new 1-based indexing scheme and helping to catch potential programming errors early.
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Code Review
This pull request modifies the file ID allocation to start from 1 instead of 0. This is a good defensive measure to prevent bugs arising from uninitialized file descriptors, which might default to 0. The implementation correctly adjusts ID generation and adds an assertion to enforce that file ID 0 is invalid. My review includes a suggestion to improve a comment's clarity and ensure consistent casting style, enhancing code maintainability.
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Common usage of meterfs involves using static fd table in zeroed bss. This causes that programmer error (eg. invalid initialisation) can lead to weird and hard to identify errors, that someone writes to firstly created file, instead of proper one. Starting id from 1 can help to avoid that kind of issues.
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Common usage of meterfs involves using static fd table in zeroed bss. This causes that programmer error (eg. invalid initialisation) can lead to weird and hard to identify errors, that someone writes to firstly created file, instead of proper one.
Starting id from 1 can help to avoid that kind of issues.
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