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Extend the BufFile interface.

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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
This commit is contained in:
Amit Kapila
2020-08-26 07:36:43 +05:30
parent adc8fc6167
commit 808e13b282
11 changed files with 239 additions and 28 deletions
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2
src/include/storage/fd.h
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@@ -94,7 +94,7 @@ extern mode_t FileGetRawMode(File file);
/* Operations used for sharing named temporary files */
extern File PathNameCreateTemporaryFile(const char *name, bool error_on_failure);
extern File PathNameOpenTemporaryFile(const char *name);
extern File PathNameOpenTemporaryFile(const char *path, int mode);
extern bool PathNameDeleteTemporaryFile(const char *name, bool error_on_failure);
extern void PathNameCreateTemporaryDir(const char *base, const char *name);
extern void PathNameDeleteTemporaryDir(const char *name);