ad3bdefe87
Fix kpf_copy_bit(src,dst) to be kpf_copy_bit(dst,src) to match the actual call patterns, e.g. kpf_copy_bit(kflags, KPF_LOCKED, PG_locked). This misplacement of src/dst only affected reporting of PG_writeback, PG_reclaim and PG_buddy. For others kflags==uflags so not affected. Signed-off-by: Wu Fengguang <fengguang.wu@intel.com> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: stable@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
147 lines
3.4 KiB
C
147 lines
3.4 KiB
C
#include <linux/bootmem.h>
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#include <linux/compiler.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/mm.h>
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#include <linux/mmzone.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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#include <asm/uaccess.h>
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#include "internal.h"
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#define KPMSIZE sizeof(u64)
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#define KPMMASK (KPMSIZE - 1)
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/* /proc/kpagecount - an array exposing page counts
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*
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* Each entry is a u64 representing the corresponding
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* physical page count.
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*/
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static ssize_t kpagecount_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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u64 __user *out = (u64 __user *)buf;
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struct page *ppage;
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unsigned long src = *ppos;
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unsigned long pfn;
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ssize_t ret = 0;
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u64 pcount;
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pfn = src / KPMSIZE;
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count = min_t(size_t, count, (max_pfn * KPMSIZE) - src);
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if (src & KPMMASK || count & KPMMASK)
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return -EINVAL;
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while (count > 0) {
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ppage = NULL;
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if (pfn_valid(pfn))
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ppage = pfn_to_page(pfn);
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pfn++;
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if (!ppage)
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pcount = 0;
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else
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pcount = page_mapcount(ppage);
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if (put_user(pcount, out++)) {
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ret = -EFAULT;
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break;
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}
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count -= KPMSIZE;
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}
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*ppos += (char __user *)out - buf;
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if (!ret)
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ret = (char __user *)out - buf;
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return ret;
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}
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static const struct file_operations proc_kpagecount_operations = {
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.llseek = mem_lseek,
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.read = kpagecount_read,
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};
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/* /proc/kpageflags - an array exposing page flags
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*
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* Each entry is a u64 representing the corresponding
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* physical page flags.
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*/
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/* These macros are used to decouple internal flags from exported ones */
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#define KPF_LOCKED 0
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#define KPF_ERROR 1
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#define KPF_REFERENCED 2
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#define KPF_UPTODATE 3
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#define KPF_DIRTY 4
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#define KPF_LRU 5
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#define KPF_ACTIVE 6
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#define KPF_SLAB 7
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#define KPF_WRITEBACK 8
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#define KPF_RECLAIM 9
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#define KPF_BUDDY 10
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#define kpf_copy_bit(flags, dstpos, srcpos) (((flags >> srcpos) & 1) << dstpos)
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static ssize_t kpageflags_read(struct file *file, char __user *buf,
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size_t count, loff_t *ppos)
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{
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u64 __user *out = (u64 __user *)buf;
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struct page *ppage;
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unsigned long src = *ppos;
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unsigned long pfn;
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ssize_t ret = 0;
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u64 kflags, uflags;
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pfn = src / KPMSIZE;
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count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src);
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if (src & KPMMASK || count & KPMMASK)
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return -EINVAL;
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while (count > 0) {
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ppage = NULL;
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if (pfn_valid(pfn))
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ppage = pfn_to_page(pfn);
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pfn++;
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if (!ppage)
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kflags = 0;
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else
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kflags = ppage->flags;
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uflags = kpf_copy_bit(kflags, KPF_LOCKED, PG_locked) |
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kpf_copy_bit(kflags, KPF_ERROR, PG_error) |
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kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) |
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kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) |
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kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) |
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kpf_copy_bit(kflags, KPF_LRU, PG_lru) |
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kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) |
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kpf_copy_bit(kflags, KPF_SLAB, PG_slab) |
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kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) |
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kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) |
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kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy);
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if (put_user(uflags, out++)) {
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ret = -EFAULT;
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break;
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}
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count -= KPMSIZE;
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}
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*ppos += (char __user *)out - buf;
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if (!ret)
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ret = (char __user *)out - buf;
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return ret;
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}
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static const struct file_operations proc_kpageflags_operations = {
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.llseek = mem_lseek,
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.read = kpageflags_read,
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};
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static int __init proc_page_init(void)
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{
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proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations);
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proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations);
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return 0;
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}
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module_init(proc_page_init);
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