diff options
Diffstat (limited to 'fs/proc/page.c')
| -rw-r--r-- | fs/proc/page.c | 161 |
1 files changed, 54 insertions, 107 deletions
diff --git a/fs/proc/page.c b/fs/proc/page.c index 23fc771100ae..999af26c7298 100644 --- a/fs/proc/page.c +++ b/fs/proc/page.c @@ -22,6 +22,12 @@ #define KPMMASK (KPMSIZE - 1) #define KPMBITS (KPMSIZE * BITS_PER_BYTE) +enum kpage_operation { + KPAGE_FLAGS, + KPAGE_COUNT, + KPAGE_CGROUP, +}; + static inline unsigned long get_max_dump_pfn(void) { #ifdef CONFIG_SPARSEMEM @@ -37,19 +43,17 @@ static inline unsigned long get_max_dump_pfn(void) #endif } -/* /proc/kpagecount - an array exposing page mapcounts - * - * Each entry is a u64 representing the corresponding - * physical page mapcount. - */ -static ssize_t kpagecount_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) +static ssize_t kpage_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos, + enum kpage_operation op) { const unsigned long max_dump_pfn = get_max_dump_pfn(); u64 __user *out = (u64 __user *)buf; + struct page *page; unsigned long src = *ppos; unsigned long pfn; ssize_t ret = 0; + u64 info; pfn = src / KPMSIZE; if (src & KPMMASK || count & KPMMASK) @@ -59,24 +63,34 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf, count = min_t(unsigned long, count, (max_dump_pfn * KPMSIZE) - src); while (count > 0) { - struct page *page; - u64 mapcount = 0; - /* * TODO: ZONE_DEVICE support requires to identify * memmaps that were actually initialized. */ page = pfn_to_online_page(pfn); - if (page) { - struct folio *folio = page_folio(page); - if (IS_ENABLED(CONFIG_PAGE_MAPCOUNT)) - mapcount = folio_precise_page_mapcount(folio, page); - else - mapcount = folio_average_page_mapcount(folio); - } - - if (put_user(mapcount, out)) { + if (page) { + switch (op) { + case KPAGE_FLAGS: + info = stable_page_flags(page); + break; + case KPAGE_COUNT: + if (IS_ENABLED(CONFIG_PAGE_MAPCOUNT)) + info = folio_precise_page_mapcount(page_folio(page), page); + else + info = folio_average_page_mapcount(page_folio(page)); + break; + case KPAGE_CGROUP: + info = page_cgroup_ino(page); + break; + default: + info = 0; + break; + } + } else + info = 0; + + if (put_user(info, out)) { ret = -EFAULT; break; } @@ -94,17 +108,23 @@ static ssize_t kpagecount_read(struct file *file, char __user *buf, return ret; } +/* /proc/kpagecount - an array exposing page mapcounts + * + * Each entry is a u64 representing the corresponding + * physical page mapcount. + */ +static ssize_t kpagecount_read(struct file *file, char __user *buf, + size_t count, loff_t *ppos) +{ + return kpage_read(file, buf, count, ppos, KPAGE_COUNT); +} + static const struct proc_ops kpagecount_proc_ops = { .proc_flags = PROC_ENTRY_PERMANENT, .proc_lseek = mem_lseek, .proc_read = kpagecount_read, }; -/* /proc/kpageflags - an array exposing page flags - * - * Each entry is a u64 representing the corresponding - * physical page flags. - */ static inline u64 kpf_copy_bit(u64 kflags, int ubit, int kbit) { @@ -225,47 +245,17 @@ u64 stable_page_flags(const struct page *page) #endif return u; -}; +} +/* /proc/kpageflags - an array exposing page flags + * + * Each entry is a u64 representing the corresponding + * physical page flags. + */ static ssize_t kpageflags_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) + size_t count, loff_t *ppos) { - const unsigned long max_dump_pfn = get_max_dump_pfn(); - u64 __user *out = (u64 __user *)buf; - unsigned long src = *ppos; - unsigned long pfn; - ssize_t ret = 0; - - pfn = src / KPMSIZE; - if (src & KPMMASK || count & KPMMASK) - return -EINVAL; - if (src >= max_dump_pfn * KPMSIZE) - return 0; - count = min_t(unsigned long, count, (max_dump_pfn * KPMSIZE) - src); - - while (count > 0) { - /* - * TODO: ZONE_DEVICE support requires to identify - * memmaps that were actually initialized. - */ - struct page *page = pfn_to_online_page(pfn); - - if (put_user(stable_page_flags(page), out)) { - ret = -EFAULT; - break; - } - - pfn++; - out++; - count -= KPMSIZE; - - cond_resched(); - } - - *ppos += (char __user *)out - buf; - if (!ret) - ret = (char __user *)out - buf; - return ret; + return kpage_read(file, buf, count, ppos, KPAGE_FLAGS); } static const struct proc_ops kpageflags_proc_ops = { @@ -276,53 +266,10 @@ static const struct proc_ops kpageflags_proc_ops = { #ifdef CONFIG_MEMCG static ssize_t kpagecgroup_read(struct file *file, char __user *buf, - size_t count, loff_t *ppos) + size_t count, loff_t *ppos) { - const unsigned long max_dump_pfn = get_max_dump_pfn(); - u64 __user *out = (u64 __user *)buf; - struct page *ppage; - unsigned long src = *ppos; - unsigned long pfn; - ssize_t ret = 0; - u64 ino; - - pfn = src / KPMSIZE; - if (src & KPMMASK || count & KPMMASK) - return -EINVAL; - if (src >= max_dump_pfn * KPMSIZE) - return 0; - count = min_t(unsigned long, count, (max_dump_pfn * KPMSIZE) - src); - - while (count > 0) { - /* - * TODO: ZONE_DEVICE support requires to identify - * memmaps that were actually initialized. - */ - ppage = pfn_to_online_page(pfn); - - if (ppage) - ino = page_cgroup_ino(ppage); - else - ino = 0; - - if (put_user(ino, out)) { - ret = -EFAULT; - break; - } - - pfn++; - out++; - count -= KPMSIZE; - - cond_resched(); - } - - *ppos += (char __user *)out - buf; - if (!ret) - ret = (char __user *)out - buf; - return ret; + return kpage_read(file, buf, count, ppos, KPAGE_CGROUP); } - static const struct proc_ops kpagecgroup_proc_ops = { .proc_flags = PROC_ENTRY_PERMANENT, .proc_lseek = mem_lseek, |