Amit Kapila 808e13b282 Extend the BufFile interface. ... Allow BufFile to support temporary files that can be used by the single backend when the corresponding files need to be survived across the transaction and need to be opened and closed multiple times. Such files need to be created as a member of a SharedFileSet. Additionally, this commit implements the interface for BufFileTruncate to allow files to be truncated up to a particular offset and extends the BufFileSeek API to support the SEEK_END case. This also adds an option to provide a mode while opening the shared BufFiles instead of always opening in read-only mode. These enhancements in BufFile interface are required for the upcoming patch to allow the replication apply worker, to handle streamed in-progress transactions. Author: Dilip Kumar, Amit Kapila Reviewed-by: Amit Kapila Tested-by: Neha Sharma Discussion: https://postgr.es/m/688b0b7f-2f6c-d827-c27b-216a8e3ea700@2ndquadrant.com		2020-08-26 07:36:43 +05:30
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src	Extend the BufFile interface.	2020-08-26 07:36:43 +05:30
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