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Redundancy file operation library (librefop) Redundancy file operation library is a another implementation for the backup manager of AGL base system. It aim to tiny implementation. Configure option : --enable-address-sanitizer Enable address sanitizer in build time (for debug, default is no) --enable-gcov Enable gcov in build time (for debug, default is no) --enable-test Enable unit test build (requir to gtest and gmock, default is no) File operation algorithm : New data write - case 1.. 1-0. Initial state. -------- | latest | | file | -------- 1-1. Create new file. -------- | New | | file | -------- -------- | latest | | file | -------- 1-2. Rename from latest file to backup file. -------- | New | | file | -------- -------- --> | backup | rename | file | -------- 1-3. Create new data file. | rename from new to latest -------- -------- | latest | | backup | | file | | file | -------- -------- 1-4. Done. New data write - case 2. 2-0. Initial state. -------- -------- | latest | | backup | | file | | file | -------- -------- 2-1. Create new file. -------- | New | | file | -------- -------- -------- | latest | | backup | | file | | file | -------- -------- 2-2. Remove backup file. -------- | New | | file | -------- -------- | latest | remove | file | backup file -------- 2-3. Rename from latest file to backup file. -------- | New | | file | -------- -------- --> | backup | rename | file | -------- 2-4. Create new data file. | rename from new to latest -------- -------- | latest | | backup | | file | | file | -------- -------- 2-5. Done. Recovery from abnormal conditions. Note. 'p1,p2' is a file selection priority. [High pri.] p1 > p2 [Low pri.] ac1. Nodata Return a no data. ac2. Latest file only. -------- | latest | | file | -------- p1 Return data from a latest file. ac3. Backup file only. -------- | backup | | file | -------- p1 Return data from a backup file. ac4. Have a two file (normal condition). -------- -------- | latest | | backup | | file | | file | -------- -------- p1 p2 Return data from a latest file. ac5. Latest file and new file. -------- | New | | file | -------- -------- | latest | | file | -------- p1 Return data from a latest file. Typically new file may not completed write operation. ac6. Backup file and new file. -------- | New | | file | -------- -------- | backup | | file | -------- p1 Return data from a backup file. Typically new file may not completed write operation. ac7. Latest file and backup file and new file. -------- | New | | file | -------- -------- -------- | latest | | backup | | file | | file | -------- -------- p1 p2 Return data from a latest file. Typically new file may not completed write operation. When the data block of high priority file was broken, this library select next priority file.
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Development fork for https://git.automotivelinux.org/src/librefop