The patch titled Subject: aoe: retain static block device numbers for backwards compatibility has been removed from the -mm tree. Its filename was aoe-retain-static-block-device-numbers-for-backwards-compatibility.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Ed Cashin <ecashin@xxxxxxxxxx> Subject: aoe: retain static block device numbers for backwards compatibility The old mapping between AoE target shelf and slot addresses and the block device minor number is retained as a backwards-compatible feature, with a new "aoe_dyndevs" module parameter available for enabling dynamic block device minor numbers. Signed-off-by: Ed Cashin <ecashin@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/block/aoe/aoedev.c | 54 +++++++++++++++++++++++++++++++++-- 1 file changed, 51 insertions(+), 3 deletions(-) diff -puN drivers/block/aoe/aoedev.c~aoe-retain-static-block-device-numbers-for-backwards-compatibility drivers/block/aoe/aoedev.c --- a/drivers/block/aoe/aoedev.c~aoe-retain-static-block-device-numbers-for-backwards-compatibility +++ a/drivers/block/aoe/aoedev.c @@ -11,6 +11,7 @@ #include <linux/slab.h> #include <linux/bitmap.h> #include <linux/kdev_t.h> +#include <linux/moduleparam.h> #include "aoe.h" static void dummy_timer(ulong); @@ -18,6 +19,10 @@ static void aoedev_freedev(struct aoedev static void freetgt(struct aoedev *d, struct aoetgt *t); static void skbpoolfree(struct aoedev *d); +static int aoe_dyndevs; +module_param(aoe_dyndevs, int, 0644); +MODULE_PARM_DESC(aoe_dyndevs, "Use dynamic minor numbers for devices."); + static struct aoedev *devlist; static DEFINE_SPINLOCK(devlist_lock); @@ -34,7 +39,7 @@ static DEFINE_SPINLOCK(used_minors_lock) static DECLARE_BITMAP(used_minors, N_DEVS); static int -minor_get(ulong *minor) +minor_get_dyn(ulong *sysminor) { ulong flags; ulong n; @@ -48,10 +53,53 @@ minor_get(ulong *minor) error = -1; spin_unlock_irqrestore(&used_minors_lock, flags); - *minor = n * AOE_PARTITIONS; + *sysminor = n * AOE_PARTITIONS; return error; } +static int +minor_get_static(ulong *sysminor, ulong aoemaj, int aoemin) +{ + ulong flags; + ulong n; + int error = 0; + enum { + /* for backwards compatibility when !aoe_dyndevs, + * a static number of supported slots per shelf */ + NPERSHELF = 16, + }; + + n = aoemaj * NPERSHELF + aoemin; + if (aoemin >= NPERSHELF || n >= N_DEVS) { + pr_err("aoe: %s with e%ld.%d\n", + "cannot use static minor device numbers", + aoemaj, aoemin); + error = -1; + } else { + spin_lock_irqsave(&used_minors_lock, flags); + if (test_bit(n, used_minors)) { + pr_err("aoe: %s %lu\n", + "existing device already has static minor number", + n); + error = -1; + } else + set_bit(n, used_minors); + spin_unlock_irqrestore(&used_minors_lock, flags); + } + + *sysminor = n; + return error; +} + +static int +minor_get(ulong *sysminor, ulong aoemaj, int aoemin) +{ + if (aoe_dyndevs) + return minor_get_dyn(sysminor); + else + return minor_get_static(sysminor, aoemaj, aoemin); +} + static void minor_free(ulong minor) { @@ -293,7 +341,7 @@ aoedev_by_aoeaddr(ulong maj, int min, in d->ref++; break; } - if (d || !do_alloc || minor_get(&sysminor) < 0) + if (d || !do_alloc || minor_get(&sysminor, maj, min) < 0) goto out; d = kcalloc(1, sizeof *d, GFP_ATOMIC); if (!d) _ Patches currently in -mm which might be from ecashin@xxxxxxxxxx are origin.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html