Messages in this thread | | | From | "Hua Zhong" <> | Subject | dirty buffers and umount/remount | Date | Tue, 11 Jun 2002 00:50:46 -0700 |
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Hi all:
I have a question that should be simple to answer.
When building a system I need to make sure that whenever user wants to save configuration to nonvolatile storage (i.e., disk), all dirty buffers are flushed to disk. Basically I do the following:
1) mount filesystem X from read-only to read-write. 2) save all configuration files to a directory A on X. 3) do a sync. 4) write a label file in A saying "this marks a successful save of all the configuration files". 5) remount X as read-only.
The problem is that 3) takes quite long time to finish (even most files in 2) are opened with O_SYNC).
I am wondering if 3) is necessary or not. When the filesystem is remounted from rw to ro, are all dirty buffers related to it flushed to disk? How about umount?
The last related question: is the kdev field in the buffer head the physical block device (i.e., /dev/hda) or the logical block device (i.e., /dev/hda7)?
Thanks a lot.
Hua
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