BLK_QUEUE_LOGICAL_BL(9) Block Devices BLK_QUEUE_LOGICAL_BL(9)NAME
blk_queue_logical_block_size - set logical block size for the queue
SYNOPSIS
void blk_queue_logical_block_size(struct request_queue * q, unsigned short size);
ARGUMENTS
q
the request queue for the device
size
the logical block size, in bytes
DESCRIPTION
This should be set to the lowest possible block size that the storage device can address. The default of 512 covers most hardware.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BLK_QUEUE_LOGICAL_BL(9)
Check Out this Related Man Page
TP(5) File Formats Manual TP(5)NAME
tp - DEC/mag tape formats
DESCRIPTION
Tp dumps files to and extracts files from DECtape and magtape. The formats of these tapes are the same except that magtapes have larger
directories.
Block zero contains a copy of a stand-alone bootstrap program. See reboot(8).
Blocks 1 through 24 for DECtape (1 through 62 for magtape) contain a directory of the tape. There are 192 (resp. 496) entries in the
directory; 8 entries per block; 64 bytes per entry. Each entry has the following format:
struct {
char pathname[32];
unsigned short mode;
char uid;
char gid;
char unused1;
char size[3];
long modtime;
unsigned short tapeaddr;
char unused2[16];
unsigned short checksum;
};
The path name entry is the path name of the file when put on the tape. If the pathname starts with a zero word, the entry is empty. It is
at most 32 bytes long and ends in a null byte. Mode, uid, gid, size and time modified are the same as described under i-nodes (see file
system fs(5)). The tape address is the tape block number of the start of the contents of the file. Every file starts on a block boundary.
The file occupies (size+511)/512 blocks of continuous tape. The checksum entry has a value such that the sum of the 32 words of the direc-
tory entry is zero.
Blocks above 25 (resp. 63) are available for file storage.
A fake entry has a size of zero.
SEE ALSO fs(5), tp(1)BUGS
The pathname, uid, gid, and size fields are too small.
7th Edition May 15, 1985 TP(5)
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