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Improve sha1 object file writing.

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Make it much safer: we write to a temporary file, and then link that
temporary file to the final destination. This avoids all the nasty
races if several people write the same object at the same time.

It should also result in nicer on-disk layout, since it means that
objects all get created in the same subdirectory. That makes a lot
of block allocation algorithms happier, since the objects will now
be allocated from the same zone.
This commit is contained in:
Linus Torvalds
2005-05-03 11:46:16 -07:00
parent 92d4c85d24
commit aac1794132
2 changed files with 39 additions and 96 deletions
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3
cache.h
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@ -128,9 +128,6 @@ extern int index_fd(unsigned char *sha1, int fd, struct stat *st);
/* Return a statically allocated filename matching the sha1 signature */
extern char *sha1_file_name(const unsigned char *sha1);
/* Write a memory buffer out to the sha file */
extern int write_sha1_buffer(const unsigned char *sha1, void *buf, unsigned int size);
/* Read and unpack a sha1 file into memory, write memory to a sha1 file */
extern void * map_sha1_file(const unsigned char *sha1, unsigned long *size);
extern void * unpack_sha1_file(void *map, unsigned long mapsize, char *type, unsigned long *size);