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74 lines
1.9 KiB
74 lines
1.9 KiB
package mount
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import (
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"context"
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"github.com/hanwen/go-fuse/v2/fuse"
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"net/http"
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"syscall"
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)
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/**
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* Write data
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*
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* Write should return exactly the number of bytes requested
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* except on error. An exception to this is when the file has
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* been opened in 'direct_io' mode, in which case the return value
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* of the write system call will reflect the return value of this
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* operation.
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*
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* Unless FUSE_CAP_HANDLE_KILLPRIV is disabled, this method is
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* expected to reset the setuid and setgid bits.
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*
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* fi->fh will contain the value set by the open method, or will
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* be undefined if the open method didn't set any value.
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*
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* Valid replies:
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* fuse_reply_write
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* fuse_reply_err
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*
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* @param req request handle
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* @param ino the inode number
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* @param buf data to write
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* @param size number of bytes to write
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* @param off offset to write to
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* @param fi file information
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*/
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func (wfs *WFS) Write(cancel <-chan struct{}, in *fuse.WriteIn, data []byte) (written uint32, code fuse.Status) {
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if wfs.IsOverQuota {
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return 0, fuse.Status(syscall.ENOSPC)
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}
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fh := wfs.GetHandle(FileHandleId(in.Fh))
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if fh == nil {
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return 0, fuse.ENOENT
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}
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fh.dirtyPages.writerPattern.MonitorWriteAt(int64(in.Offset), int(in.Size))
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fh.orderedMutex.Acquire(context.Background(), 1)
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defer fh.orderedMutex.Release(1)
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entry := fh.GetEntry()
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if entry == nil {
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return 0, fuse.OK
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}
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entry.Content = nil
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offset := int64(in.Offset)
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entry.Attributes.FileSize = uint64(max(offset+int64(len(data)), int64(entry.Attributes.FileSize)))
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// glog.V(4).Infof("%v write [%d,%d) %d", fh.f.fullpath(), req.Offset, req.Offset+int64(len(req.Data)), len(req.Data))
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fh.dirtyPages.AddPage(offset, data, fh.dirtyPages.writerPattern.IsSequentialMode())
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written = uint32(len(data))
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if offset == 0 {
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// detect mime type
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fh.contentType = http.DetectContentType(data)
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}
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fh.dirtyMetadata = true
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return written, fuse.OK
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}
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