delay in block_read_full_page()
From: Michael Mesnier
Date: Sat Nov 06 2004 - 02:17:14 EST
Hello,
Please cc: me directly in your response.
I'm running into some trouble with an installable file system I'm
writing. In myfs_readpage() I simply return block_read_full_page() which
subsequently calls myfs_get_block(). However, there's a delay before
the I/O actually gets issued to the device. Running sync from the
command line causes the I/O to get issued immediately, so the sync call
(even it there aren't dirty buffers) also manages to schedule any
outstanding read I/Os. How should my fs indicate to the vfs that these
read I/Os need to be issued immediately after my_readpage() is called?
Thanks in advanced,
-Mike
static int myfs_get_block(struct inode *inode, long iblock, struct
buffer_head *bh_result, int create) {
bh_result->b_dev = inode->i_dev;
bh_result->b_blocknr = iblock;
bh_result->b_state |= (1UL << BH_Mapped);
return 0;
}
static int myfs_readpage(struct file *file, struct page *page) {
return block_read_full_page(page,myfs_get_block);
}
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