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acme: add comment for aligned writes

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TBR=r
https://codereview.appspot.com/89510044
This commit is contained in:
Russ Cox 2014-04-19 13:44:06 -04:00
parent 1d2c3c3945
commit 833216fef8
1 changed files with 5 additions and 0 deletions
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5
src/cmd/acme/exec.c
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@ -662,6 +662,11 @@ putfile(File *f, int q0, int q1, Rune *namer, int nname)
warning(nil, "can't create file %s: %r\n", name); warning(nil, "can't create file %s: %r\n", name);
goto Rescue1; goto Rescue1;
} }
// Use bio in order to force the writes to be large and
// block-aligned (bio's default is 8K). This is not strictly
// necessary; it works around some buggy underlying
// file systems that mishandle unaligned writes.
// https://codereview.appspot.com/89550043/
b = emalloc(sizeof *b); b = emalloc(sizeof *b);
Binit(b, fd, OWRITE); Binit(b, fd, OWRITE);
r = fbufalloc(); r = fbufalloc();