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硬盤扇區(qū)的讀寫函數(shù)及其調(diào)用路徑
2007-01-26   中國IT實驗室

幾種情況下的調(diào)用路徑

1)

8044 "pdflush" c68be034 { } | __ide_do_rw_disk | ide_do_rw_disk | start_request | ide_do_request | do_ide_request | __generic_unplug_device | __elv_add_request | __make_request | generic_make_request | submit_bio | mpage_bio_submit | __mpage_writepage | mpage_writepages | ext2_writepages | do_writepages | __sync_single_inode | __writeback_single_inode | generic_sync_sb_inodes | sync_sb_inodes | writeback_inodes | wb_kupdate | __pdflush | pdflush | kthread | kernel_thread_helper

2)

1288 "kjournald" de850034 { } | __ide_do_rw_disk | ide_do_rw_disk | start_request | ide_do_request | do_ide_request | __generic_unplug_device | generic_unplug_device | blk_backing_dev_unplug | sync_buffer | __wait_on_bit | out_of_line_wait_on_bit | __wait_on_buffer | sync_dirty_buffer | journal_write_commit_record | journal_commit_transaction | kjournald | kernel_thread_helper

3)

4409 "syslog-ng" dccf6034 { } | __ide_do_rw_disk | ide_do_rw_disk | start_request | ide_do_request | do_ide_request | __generic_unplug_device | cfq_start_queueing | cfq_crq_enqueued | cfq_enqueue | cfq_insert_request | __elv_add_request | __make_request | generic_make_request | submit_bio | submit_bh | __block_write_full_page | block_write_full_page | ext3_ordered_writepage | mpage_writepages | do_writepages | __filemap_fdatawrite_range | filemap_fdatawrite | do_fsync | sys_fsync | sysenter_past_esp

4)

448 "kblockd/0" dfe20034 { } | __ide_do_rw_disk | ide_do_rw_disk | start_request | ide_do_request | do_ide_request | cfq_kick_queue | worker_thread | kthread | kernel_thread_helper

希望對分析DISK IO的關(guān)系有一點幫助。

CODE://in drivers/ide/ide-disk.c /* * __ide_do_rw_disk() issues READ and WRITE commands to a disk,* using LBA if supported, or CHS otherwise, to address sectors. */

ide_startstop_t __ide_do_rw_disk(ide_drive_t *drive, struct request *rq, sector_t block)

{ ide_hwif_t *hwif = HWIF(drive);unsigned int dma = drive->using_dma;u8 lba48 = (drive->addressing == 1) ? 1 : 0;task_ioreg_t command = WIN_NOP;ata_nsector_t nsectors;

nsectors.all = (u16) rq->nr_sectors;

if (hwif->no_lba48_dma && lba48 && dma) { if (block + rq->nr_sectors > 1ULL << 28)

dma = 0;else lba48 = 0;}……

}

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