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[PATCH] pktcdvd: Don't waste kernel memory

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Allocate memory for read-gathering at open time, when it is known just how
much memory is needed.  This avoids wasting kernel memory when the real packet
size is smaller than the maximum packet size supported by the driver.  This is
always the case when using DVD discs.

Signed-off-by: Peter Osterlund <petero2@telia.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Peter Osterlund 2006-02-04 23:27:47 -08:00 • committed by Linus Torvalds
parent b566ccefd7
commit e1bc89bc99
3 changed files with 32 additions and 29 deletions
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4
include/linux/pktcdvd.h
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@ -170,7 +170,7 @@ struct packet_iosched
#error "PAGE_SIZE must be a multiple of CD_FRAMESIZE"
#endif
#define PACKET_MAX_SIZE 32
#define PAGES_PER_PACKET (PACKET_MAX_SIZE * CD_FRAMESIZE / PAGE_SIZE)
#define FRAMES_PER_PAGE (PAGE_SIZE / CD_FRAMESIZE)
#define PACKET_MAX_SECTORS (PACKET_MAX_SIZE * CD_FRAMESIZE >> 9)
enum packet_data_state {
@ -219,7 +219,7 @@ struct packet_data
atomic_t io_errors; /* Number of read/write errors during IO */
struct bio *r_bios[PACKET_MAX_SIZE]; /* bios to use during data gathering */
struct page *pages[PAGES_PER_PACKET];
struct page *pages[PACKET_MAX_SIZE / FRAMES_PER_PAGE];
int cache_valid; /* If non-zero, the data for the zone defined */
/* by the sector variable is completely cached */