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vfs: make sure write only handles never truncate files they shouldn't

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Nick Craig-Wood 2017-11-20 18:01:42 +00:00
parent 76b151984c
commit 3fb4fe31d2
5 changed files with 94 additions and 20 deletions
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vfs/help.go
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@ -52,7 +52,8 @@ This will mean some operations are not possible
* Files can't be opened for both read AND write
* Files opened for write can't be seeked
* Files open for read/write with O_TRUNC will be opened write only
* Existing files opened for write must have O_TRUNC set
* Files open for read with O_TRUNC will be opened write only
* Files open for write only will behave as if O_TRUNC was supplied
* Open modes O_APPEND, O_TRUNC are ignored
* If an upload fails it can't be retried
@ -66,7 +67,7 @@ write will be a lot more compatible, but uses the minimal disk space.
These operations are not possible
* Files opened for write only can't be seeked
* Files open for write only will behave as if O_TRUNC was supplied
* Existing files opened for write must have O_TRUNC set
* Files opened for write only will ignore O_APPEND, O_TRUNC
* If an upload fails it can't be retried