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git_futils_writebuffer: optionally fsync

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Add a custom `O_FSYNC` bit (if it's not been defined by the operating
system`) so that `git_futils_writebuffer` can optionally do an `fsync`
when it's done writing.

We call `fsync` ourselves, even on systems that define `O_FSYNC` because
its definition is no guarantee of its actual support.  Mac, for
instance, defines it but doesn't support it in an `open(2)` call.
This commit is contained in:
Edward Thomson 2016-12-15 10:51:02 -06:00
parent 1c2c0ae2a4
commit 5312621bd4
2 changed files with 20 additions and 1 deletions
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14
src/fileops.c
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@ -235,10 +235,16 @@ int git_futils_readbuffer(git_buf *buf, const char *path)
int git_futils_writebuffer(
const git_buf *buf, const char *path, int flags, mode_t mode)
{
int fd, error = 0;
int fd, do_fsync = 0, error = 0;
if ((flags & O_FSYNC) != 0)
do_fsync = 1;
flags &= ~O_FSYNC;
if (flags <= 0)
flags = O_CREAT | O_TRUNC | O_WRONLY;
if (!mode)
mode = GIT_FILEMODE_BLOB;
@ -253,6 +259,12 @@ int git_futils_writebuffer(
return error;
}
if (do_fsync && (error = p_fsync(fd)) < 0) {
giterr_set(GITERR_OS, "could not fsync '%s'", path);
p_close(fd);
return error;
}
if ((error = p_close(fd)) < 0)
giterr_set(GITERR_OS, "error while closing '%s'", path);

7
src/fileops.h
View File

@ -25,6 +25,13 @@ extern int git_futils_readbuffer_updated(
git_buf *obj, const char *path, git_oid *checksum, int *updated);
extern int git_futils_readbuffer_fd(git_buf *obj, git_file fd, size_t len);
/* Additional constants for `git_futils_writebuffer`'s `open_flags`. We
* support these internally and they will be removed before the `open` call.
*/
#ifndef O_FSYNC
# define O_FSYNC (1 << 31)
#endif
extern int git_futils_writebuffer(
const git_buf *buf, const char *path, int open_flags, mode_t mode);