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author | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 19:54:53 (GMT) |
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committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2009-09-22 20:01:40 (GMT) |
commit | ae19ffbadc1b2100285a5b5b3d0a4e0a11390904 (patch) | |
tree | 3c2086ab67398a019089a47ca3f362a4bc6db74f /drivers/staging/cowloop/cowloop.h | |
parent | 34e84f39a27d059a3e6ec6e8b94aafa702e6f220 (diff) | |
parent | 9173a8ef24a6b1b8031507b35b8ffe5f85a87692 (diff) | |
download | linux-fsl-qoriq-ae19ffbadc1b2100285a5b5b3d0a4e0a11390904.tar.xz |
Merge branch 'master' into for-linus
Diffstat (limited to 'drivers/staging/cowloop/cowloop.h')
-rw-r--r-- | drivers/staging/cowloop/cowloop.h | 66 |
1 files changed, 66 insertions, 0 deletions
diff --git a/drivers/staging/cowloop/cowloop.h b/drivers/staging/cowloop/cowloop.h new file mode 100644 index 0000000..bbd4a35 --- /dev/null +++ b/drivers/staging/cowloop/cowloop.h @@ -0,0 +1,66 @@ +/* +** DO NOT MODIFY THESE VALUES (would make old cowfiles unusable) +*/ +#define MAPUNIT 1024 /* blocksize for bit in bitmap */ +#define MUSHIFT 10 /* bitshift for bit in bitmap */ +#define MUMASK 0x3ff /* bitmask for bit in bitmap */ + +#define COWMAGIC 0x574f437f /* byte-swapped '7f C O W' */ +#define COWDIRTY 0x01 +#define COWPACKED 0x02 +#define COWVERSION 1 + +struct cowhead +{ + int magic; /* identifies a cowfile */ + short version; /* version of cowhead */ + short flags; /* flags indicating status */ + unsigned long mapunit; /* blocksize per bit in bitmap */ + unsigned long mapsize; /* total size of bitmap (bytes) */ + unsigned long doffset; /* start-offset datablocks in cow */ + unsigned long rdoblocks; /* size of related read-only file */ + unsigned long rdofingerprint; /* fingerprint of read-only file */ + unsigned long cowused; /* number of datablocks used in cow */ +}; + +#define COWDEVDIR "/dev/cow/" +#define COWDEVICE COWDEVDIR "%ld" +#define COWCONTROL COWDEVDIR "ctl" + +#define MAXCOWS 1024 +#define COWCTL (MAXCOWS-1) /* minor number of /dev/cow/ctl */ + +#define COWPROCDIR "/proc/cow/" +#define COWPROCFILE COWPROCDIR "%d" + +/* +** ioctl related stuff +*/ +#define ANYDEV ((unsigned long)-1) + +struct cowpair +{ + unsigned char *rdofile; /* pathname of the rdofile */ + unsigned char *cowfile; /* pathname of the cowfile */ + unsigned short rdoflen; /* length of rdofile pathname */ + unsigned short cowflen; /* length of cowfile pathname */ + unsigned long device; /* requested/returned device number */ +}; + +struct cowwatch +{ + int flags; /* request flags */ + unsigned long device; /* requested device number */ + unsigned long threshold; /* continue if free Kb < threshold */ + unsigned long totalkb; /* ret: total filesystem size (Kb) */ + unsigned long availkb; /* ret: free filesystem size (Kb) */ +}; + +#define WATCHWAIT 0x01 /* block until threshold reached */ + +#define COWSYNC _IO ('C', 1) +#define COWMKPAIR _IOW ('C', 2, struct cowpair) +#define COWRMPAIR _IOW ('C', 3, unsigned long) +#define COWWATCH _IOW ('C', 4, struct cowwatch) +#define COWCLOSE _IOW ('C', 5, unsigned long) +#define COWRDOPEN _IOW ('C', 6, unsigned long) |