4546548789
This is a new generic kernel FIFO implementation. The current kernel fifo API is not very widely used, because it has to many constrains. Only 17 files in the current 2.6.31-rc5 used it. FIFO's are like list's a very basic thing and a kfifo API which handles the most use case would save a lot of development time and memory resources. I think this are the reasons why kfifo is not in use: - The API is to simple, important functions are missing - A fifo can be only allocated dynamically - There is a requirement of a spinlock whether you need it or not - There is no support for data records inside a fifo So I decided to extend the kfifo in a more generic way without blowing up the API to much. The new API has the following benefits: - Generic usage: For kernel internal use and/or device driver. - Provide an API for the most use case. - Slim API: The whole API provides 25 functions. - Linux style habit. - DECLARE_KFIFO, DEFINE_KFIFO and INIT_KFIFO Macros - Direct copy_to_user from the fifo and copy_from_user into the fifo. - The kfifo itself is an in place member of the using data structure, this save an indirection access and does not waste the kernel allocator. - Lockless access: if only one reader and one writer is active on the fifo, which is the common use case, no additional locking is necessary. - Remove spinlock - give the user the freedom of choice what kind of locking to use if one is required. - Ability to handle records. Three type of records are supported: - Variable length records between 0-255 bytes, with a record size field of 1 bytes. - Variable length records between 0-65535 bytes, with a record size field of 2 bytes. - Fixed size records, which no record size field. - Preserve memory resource. - Performance! - Easy to use! This patch: Since most users want to have the kfifo as part of another object, reorganize the code to allow including struct kfifo in another data structure. This requires changing the kfifo_alloc and kfifo_init prototypes so that we pass an existing kfifo pointer into them. This patch changes the implementation and all existing users. [akpm@linux-foundation.org: fix warning] Signed-off-by: Stefani Seibold <stefani@seibold.net> Acked-by: Greg Kroah-Hartman <gregkh@suse.de> Acked-by: Mauro Carvalho Chehab <mchehab@redhat.com> Acked-by: Andi Kleen <ak@linux.intel.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> |
||
---|---|---|
.. | ||
aacraid | ||
aic7xxx | ||
aic7xxx_old | ||
aic94xx | ||
arcmsr | ||
arm | ||
be2iscsi | ||
bfa | ||
bnx2i | ||
cxgb3i | ||
device_handler | ||
dpt | ||
fcoe | ||
fnic | ||
ibmvscsi | ||
libfc | ||
libsas | ||
lpfc | ||
megaraid | ||
mpt2sas | ||
mvsas | ||
osd | ||
pcmcia | ||
pm8001 | ||
qla2xxx | ||
qla4xxx | ||
sym53c8xx_2 | ||
.gitignore | ||
3w-9xxx.c | ||
3w-9xxx.h | ||
3w-sas.c | ||
3w-sas.h | ||
3w-xxxx.c | ||
3w-xxxx.h | ||
53c700_d.h_shipped | ||
53c700.c | ||
53c700.h | ||
53c700.scr | ||
a100u2w.c | ||
a100u2w.h | ||
a2091.c | ||
a2091.h | ||
a3000.c | ||
a3000.h | ||
a4000t.c | ||
advansys.c | ||
aha152x.c | ||
aha152x.h | ||
aha1542.c | ||
aha1542.h | ||
aha1740.c | ||
aha1740.h | ||
aic7xxx_old.c | ||
atari_NCR5380.c | ||
atari_scsi.c | ||
atari_scsi.h | ||
atp870u.c | ||
atp870u.h | ||
BusLogic.c | ||
BusLogic.h | ||
bvme6000_scsi.c | ||
ch.c | ||
constants.c | ||
dc395x.c | ||
dc395x.h | ||
dmx3191d.c | ||
dpt_i2o.c | ||
dpti.h | ||
dtc.c | ||
dtc.h | ||
eata_generic.h | ||
eata_pio.c | ||
eata_pio.h | ||
eata.c | ||
esp_scsi.c | ||
esp_scsi.h | ||
fd_mcs.c | ||
fdomain.c | ||
fdomain.h | ||
FlashPoint.c | ||
g_NCR5380_mmio.c | ||
g_NCR5380.c | ||
g_NCR5380.h | ||
gdth_ioctl.h | ||
gdth_proc.c | ||
gdth_proc.h | ||
gdth.c | ||
gdth.h | ||
gvp11.c | ||
gvp11.h | ||
hosts.c | ||
hpsa_cmd.h | ||
hpsa.c | ||
hpsa.h | ||
hptiop.c | ||
hptiop.h | ||
ibmmca.c | ||
imm.c | ||
imm.h | ||
in2000.c | ||
in2000.h | ||
initio.c | ||
initio.h | ||
ipr.c | ||
ipr.h | ||
ips.c | ||
ips.h | ||
iscsi_tcp.c | ||
iscsi_tcp.h | ||
jazz_esp.c | ||
Kconfig | ||
lasi700.c | ||
libiscsi_tcp.c | ||
libiscsi.c | ||
libsrp.c | ||
mac53c94.c | ||
mac53c94.h | ||
mac_esp.c | ||
mac_scsi.c | ||
mac_scsi.h | ||
Makefile | ||
megaraid.c | ||
megaraid.h | ||
mesh.c | ||
mesh.h | ||
mvme16x_scsi.c | ||
mvme147.c | ||
mvme147.h | ||
ncr53c8xx.c | ||
ncr53c8xx.h | ||
NCR53c406a.c | ||
NCR5380.c | ||
NCR5380.h | ||
NCR_D700.c | ||
NCR_D700.h | ||
NCR_Q720.c | ||
NCR_Q720.h | ||
nsp32_debug.c | ||
nsp32_io.h | ||
nsp32.c | ||
nsp32.h | ||
osst_detect.h | ||
osst_options.h | ||
osst.c | ||
osst.h | ||
pas16.c | ||
pas16.h | ||
pmcraid.c | ||
pmcraid.h | ||
ppa.c | ||
ppa.h | ||
ps3rom.c | ||
qla1280.c | ||
qla1280.h | ||
qlogicfas408.c | ||
qlogicfas408.h | ||
qlogicfas.c | ||
qlogicpti.c | ||
qlogicpti.h | ||
raid_class.c | ||
script_asm.pl | ||
scsi_debug.c | ||
scsi_devinfo.c | ||
scsi_error.c | ||
scsi_ioctl.c | ||
scsi_lib_dma.c | ||
scsi_lib.c | ||
scsi_logging.h | ||
scsi_module.c | ||
scsi_netlink.c | ||
scsi_priv.h | ||
scsi_proc.c | ||
scsi_sas_internal.h | ||
scsi_scan.c | ||
scsi_sysctl.c | ||
scsi_sysfs.c | ||
scsi_tgt_if.c | ||
scsi_tgt_lib.c | ||
scsi_tgt_priv.h | ||
scsi_transport_api.h | ||
scsi_transport_fc_internal.h | ||
scsi_transport_fc.c | ||
scsi_transport_iscsi.c | ||
scsi_transport_sas.c | ||
scsi_transport_spi.c | ||
scsi_transport_srp_internal.h | ||
scsi_transport_srp.c | ||
scsi_typedefs.h | ||
scsi_wait_scan.c | ||
scsi.c | ||
scsi.h | ||
scsicam.c | ||
sd_dif.c | ||
sd.c | ||
sd.h | ||
ses.c | ||
sg.c | ||
sgiwd93.c | ||
sim710.c | ||
sni_53c710.c | ||
sr_ioctl.c | ||
sr_vendor.c | ||
sr.c | ||
sr.h | ||
st_options.h | ||
st.c | ||
st.h | ||
stex.c | ||
sun3_NCR5380.c | ||
sun3_scsi_vme.c | ||
sun3_scsi.c | ||
sun3_scsi.h | ||
sun3x_esp.c | ||
sun_esp.c | ||
sym53c416.c | ||
sym53c416.h | ||
t128.c | ||
t128.h | ||
tmscsim.c | ||
tmscsim.h | ||
u14-34f.c | ||
ultrastor.c | ||
ultrastor.h | ||
vmw_pvscsi.c | ||
vmw_pvscsi.h | ||
wd33c93.c | ||
wd33c93.h | ||
wd7000.c | ||
zalon.c | ||
zorro7xx.c |