Messages in this thread | | | Date | Sat, 06 Nov 2004 02:15:46 -0500 | From | Michael Mesnier <> | Subject | delay in block_read_full_page() |
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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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