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proc: move pagecount stuff to fs/proc/page.c
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
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Alexey Dobriyan
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Oct 23, 2008
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| #include <linux/bootmem.h> | ||
| #include <linux/compiler.h> | ||
| #include <linux/fs.h> | ||
| #include <linux/init.h> | ||
| #include <linux/mm.h> | ||
| #include <linux/mmzone.h> | ||
| #include <linux/proc_fs.h> | ||
| #include <linux/seq_file.h> | ||
| #include <asm/uaccess.h> | ||
| #include "internal.h" | ||
|
|
||
| #define KPMSIZE sizeof(u64) | ||
| #define KPMMASK (KPMSIZE - 1) | ||
| /* /proc/kpagecount - an array exposing page counts | ||
| * | ||
| * Each entry is a u64 representing the corresponding | ||
| * physical page count. | ||
| */ | ||
| static ssize_t kpagecount_read(struct file *file, char __user *buf, | ||
| size_t count, loff_t *ppos) | ||
| { | ||
| u64 __user *out = (u64 __user *)buf; | ||
| struct page *ppage; | ||
| unsigned long src = *ppos; | ||
| unsigned long pfn; | ||
| ssize_t ret = 0; | ||
| u64 pcount; | ||
|
|
||
| pfn = src / KPMSIZE; | ||
| count = min_t(size_t, count, (max_pfn * KPMSIZE) - src); | ||
| if (src & KPMMASK || count & KPMMASK) | ||
| return -EINVAL; | ||
|
|
||
| while (count > 0) { | ||
| ppage = NULL; | ||
| if (pfn_valid(pfn)) | ||
| ppage = pfn_to_page(pfn); | ||
| pfn++; | ||
| if (!ppage) | ||
| pcount = 0; | ||
| else | ||
| pcount = page_mapcount(ppage); | ||
|
|
||
| if (put_user(pcount, out++)) { | ||
| ret = -EFAULT; | ||
| break; | ||
| } | ||
|
|
||
| count -= KPMSIZE; | ||
| } | ||
|
|
||
| *ppos += (char __user *)out - buf; | ||
| if (!ret) | ||
| ret = (char __user *)out - buf; | ||
| return ret; | ||
| } | ||
|
|
||
| static const struct file_operations proc_kpagecount_operations = { | ||
| .llseek = mem_lseek, | ||
| .read = kpagecount_read, | ||
| }; | ||
|
|
||
| /* /proc/kpageflags - an array exposing page flags | ||
| * | ||
| * Each entry is a u64 representing the corresponding | ||
| * physical page flags. | ||
| */ | ||
|
|
||
| /* These macros are used to decouple internal flags from exported ones */ | ||
|
|
||
| #define KPF_LOCKED 0 | ||
| #define KPF_ERROR 1 | ||
| #define KPF_REFERENCED 2 | ||
| #define KPF_UPTODATE 3 | ||
| #define KPF_DIRTY 4 | ||
| #define KPF_LRU 5 | ||
| #define KPF_ACTIVE 6 | ||
| #define KPF_SLAB 7 | ||
| #define KPF_WRITEBACK 8 | ||
| #define KPF_RECLAIM 9 | ||
| #define KPF_BUDDY 10 | ||
|
|
||
| #define kpf_copy_bit(flags, srcpos, dstpos) (((flags >> srcpos) & 1) << dstpos) | ||
|
|
||
| static ssize_t kpageflags_read(struct file *file, char __user *buf, | ||
| size_t count, loff_t *ppos) | ||
| { | ||
| u64 __user *out = (u64 __user *)buf; | ||
| struct page *ppage; | ||
| unsigned long src = *ppos; | ||
| unsigned long pfn; | ||
| ssize_t ret = 0; | ||
| u64 kflags, uflags; | ||
|
|
||
| pfn = src / KPMSIZE; | ||
| count = min_t(unsigned long, count, (max_pfn * KPMSIZE) - src); | ||
| if (src & KPMMASK || count & KPMMASK) | ||
| return -EINVAL; | ||
|
|
||
| while (count > 0) { | ||
| ppage = NULL; | ||
| if (pfn_valid(pfn)) | ||
| ppage = pfn_to_page(pfn); | ||
| pfn++; | ||
| if (!ppage) | ||
| kflags = 0; | ||
| else | ||
| kflags = ppage->flags; | ||
|
|
||
| uflags = kpf_copy_bit(KPF_LOCKED, PG_locked, kflags) | | ||
| kpf_copy_bit(kflags, KPF_ERROR, PG_error) | | ||
| kpf_copy_bit(kflags, KPF_REFERENCED, PG_referenced) | | ||
| kpf_copy_bit(kflags, KPF_UPTODATE, PG_uptodate) | | ||
| kpf_copy_bit(kflags, KPF_DIRTY, PG_dirty) | | ||
| kpf_copy_bit(kflags, KPF_LRU, PG_lru) | | ||
| kpf_copy_bit(kflags, KPF_ACTIVE, PG_active) | | ||
| kpf_copy_bit(kflags, KPF_SLAB, PG_slab) | | ||
| kpf_copy_bit(kflags, KPF_WRITEBACK, PG_writeback) | | ||
| kpf_copy_bit(kflags, KPF_RECLAIM, PG_reclaim) | | ||
| kpf_copy_bit(kflags, KPF_BUDDY, PG_buddy); | ||
|
|
||
| if (put_user(uflags, out++)) { | ||
| ret = -EFAULT; | ||
| break; | ||
| } | ||
|
|
||
| count -= KPMSIZE; | ||
| } | ||
|
|
||
| *ppos += (char __user *)out - buf; | ||
| if (!ret) | ||
| ret = (char __user *)out - buf; | ||
| return ret; | ||
| } | ||
|
|
||
| static const struct file_operations proc_kpageflags_operations = { | ||
| .llseek = mem_lseek, | ||
| .read = kpageflags_read, | ||
| }; | ||
|
|
||
| static int __init proc_page_init(void) | ||
| { | ||
| proc_create("kpagecount", S_IRUSR, NULL, &proc_kpagecount_operations); | ||
| proc_create("kpageflags", S_IRUSR, NULL, &proc_kpageflags_operations); | ||
| return 0; | ||
| } | ||
| module_init(proc_page_init); |
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