Messages in this thread Patch in this message | | | Date | Tue, 13 Apr 2004 17:06:42 -0700 | From | Andrew Morton <> | Subject | Re: [PATCH] Increase number of dynamic inodes in procfs (2.6.5) |
| |
Nathan Lynch <nathanl@austin.ibm.com> wrote: > > On some larger ppc64 configurations /proc/device-tree is exhausting > procfs' dynamic (non-pid) inode range (16K). This patch makes the > dynamic inode range 0xf0000000-0xffffffff
OK.
> and changes the inode number > allocator to use a growable linked list of bitmaps.
This open-codes a simple version of lib/idr.c. Please use lib/idr.c instead. There's an example in fs/super.c
This bit:
@@ -535,22 +537,26 @@ void emergency_remount(void) * filesystems which don't use real block-devices. -- jrs */
-enum {Max_anon = 256}; -static unsigned long unnamed_dev_in_use[Max_anon/(8*sizeof(unsigned long))]; +static struct idr unnamed_dev_idr; static spinlock_t unnamed_dev_lock = SPIN_LOCK_UNLOCKED;/* protects the above */ int set_anon_super(struct super_block *s, void *data) { int dev; + spin_lock(&unnamed_dev_lock); - dev = find_first_zero_bit(unnamed_dev_in_use, Max_anon); - if (dev == Max_anon) { + if (idr_pre_get(&unnamed_dev_idr, GFP_ATOMIC) == 0) { spin_unlock(&unnamed_dev_lock); - return -EMFILE; + return -ENOMEM; } - set_bit(dev, unnamed_dev_in_use); + dev = idr_get_new(&unnamed_dev_idr, NULL); spin_unlock(&unnamed_dev_lock); - s->s_dev = MKDEV(0, dev); + + if ((dev & MAX_ID_MASK) == (1 << MINORBITS)) { + idr_remove(&unnamed_dev_idr, dev); + return -EMFILE; + } + s->s_dev = MKDEV(0, dev & MINORMASK); return 0; } @@ -559,14 +565,20 @@ EXPORT_SYMBOL(set_anon_super); void kill_anon_super(struct super_block *sb) { int slot = MINOR(sb->s_dev); + generic_shutdown_super(sb); spin_lock(&unnamed_dev_lock); - clear_bit(slot, unnamed_dev_in_use); + idr_remove(&unnamed_dev_idr, slot); spin_unlock(&unnamed_dev_lock); } EXPORT_SYMBOL(kill_anon_super); +void __init unnamed_dev_init(void) +{ + idr_init(&unnamed_dev_idr); +} + void kill_litter_super(struct super_block *sb) { if (sb->s_root) - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |