LL_RW_BLOCK - Online Linux Manual PageSection : 9
Updated : June 2018
Source : Kernel Hackers Manual 2​.6​.
Note : The Linux VFS

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NAMEll_rw_block − level access to block devices (DEPRECATED)

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SYNOPSISvoid ll_rw_block(int rw, int nr, struct buffer_head * bhs[]);

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ARGUMENTSrw whether to READ or WRITE or maybe READA (readahead) nr number of struct buffer_heads in the array bhs[] array of pointers to struct buffer_head

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DESCRIPTIONll_rw_block takes an array of pointers to struct buffer_heads, and requests an I/O operation on them, either a READ or a WRITE​. The third READA option is described in the documentation for generic_make_request which ll_rw_block calls​. This function drops any buffer that it cannot get a lock on (with the BH_Lock state bit), any buffer that appears to be clean when doing a write request, and any buffer that appears to be up−to−date when doing read request​. Further it marks as clean buffers that are processed for writing (the buffer cache won´t assume that they are actually clean until the buffer gets unlocked)​. ll_rw_block sets b_end_io to simple completion handler that marks the buffer up−to−date (if approriate), unlocks the buffer and wakes any waiters​. All of the buffers must be for the same device, and must also be a multiple of the current approved size for the device​.

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