prelloc: warn and continue if fallocate(2) is not supported
This makes gocryptfs work at all on ZFS. See https://github.com/rfjakob/gocryptfs/issues/22 .
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@ -1,6 +1,13 @@
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package fusefrontend
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package fusefrontend
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import "syscall"
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import (
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"sync"
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"syscall"
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)
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import "github.com/rfjakob/gocryptfs/internal/toggledlog"
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var preallocWarn sync.Once
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// prealloc - preallocate space without changing the file size. This prevents
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// prealloc - preallocate space without changing the file size. This prevents
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// us from running out of space in the middle of an operation.
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// us from running out of space in the middle of an operation.
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@ -13,6 +20,16 @@ func prealloc(fd int, off int64, len int64) (err error) {
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// signal and we should try again.
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// signal and we should try again.
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continue
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continue
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}
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}
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if err == syscall.EOPNOTSUPP {
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// ZFS does not support fallocate which caused gocryptfs to abort
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// every write operation: https://github.com/rfjakob/gocryptfs/issues/22
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preallocWarn.Do(func() {
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toggledlog.Warn.Printf("Warning: The underlying filesystem " +
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"does not support fallocate(2). gocryptfs will continue working " +
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"but is no longer resistant against out-of-space errors.\n")
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})
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return nil
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}
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return err
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return err
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}
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}
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}
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}
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