diff options
Diffstat (limited to 'mm/swapfile.c')
| -rw-r--r-- | mm/swapfile.c | 45 |
1 files changed, 26 insertions, 19 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c index 1781308..4f6cba1 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -335,7 +335,7 @@ static void cluster_list_add_tail(struct swap_cluster_list *list, ci_tail = ci + tail; spin_lock_nested(&ci_tail->lock, SINGLE_DEPTH_NESTING); cluster_set_next(ci_tail, idx); - unlock_cluster(ci_tail); + spin_unlock(&ci_tail->lock); cluster_set_next_flag(&list->tail, idx, 0); } } @@ -672,6 +672,9 @@ checks: else goto done; } + si->swap_map[offset] = usage; + inc_cluster_info_page(si, si->cluster_info, offset); + unlock_cluster(ci); if (offset == si->lowest_bit) si->lowest_bit++; @@ -685,9 +688,6 @@ checks: plist_del(&si->avail_list, &swap_avail_head); spin_unlock(&swap_avail_lock); } - si->swap_map[offset] = usage; - inc_cluster_info_page(si, si->cluster_info, offset); - unlock_cluster(ci); si->cluster_next = offset + 1; slots[n_ret++] = swp_entry(si->type, offset); @@ -1079,8 +1079,6 @@ void swapcache_free_entries(swp_entry_t *entries, int n) p = swap_info_get_cont(entries[i], prev); if (p) swap_entry_free(p, entries[i]); - else - break; prev = p; } if (p) @@ -1111,6 +1109,18 @@ int page_swapcount(struct page *page) return count; } +static int swap_swapcount(struct swap_info_struct *si, swp_entry_t entry) +{ + int count = 0; + pgoff_t offset = swp_offset(entry); + struct swap_cluster_info *ci; + + ci = lock_cluster_or_swap_info(si, offset); + count = swap_count(si->swap_map[offset]); + unlock_cluster_or_swap_info(si, ci); + return count; +} + /* * How many references to @entry are currently swapped out? * This does not give an exact answer when swap count is continued, @@ -1119,17 +1129,11 @@ int page_swapcount(struct page *page) int __swp_swapcount(swp_entry_t entry) { int count = 0; - pgoff_t offset; struct swap_info_struct *si; - struct swap_cluster_info *ci; si = __swap_info_get(entry); - if (si) { - offset = swp_offset(entry); - ci = lock_cluster_or_swap_info(si, offset); - count = swap_count(si->swap_map[offset]); - unlock_cluster_or_swap_info(si, ci); - } + if (si) + count = swap_swapcount(si, entry); return count; } @@ -1291,7 +1295,8 @@ int free_swap_and_cache(swp_entry_t entry) * Also recheck PageSwapCache now page is locked (above). */ if (PageSwapCache(page) && !PageWriteback(page) && - (!page_mapped(page) || mem_cgroup_swap_full(page))) { + (!page_mapped(page) || mem_cgroup_swap_full(page)) && + !swap_swapcount(p, entry)) { delete_from_swap_cache(page); SetPageDirty(page); } @@ -2265,8 +2270,8 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile) free_percpu(p->percpu_cluster); p->percpu_cluster = NULL; vfree(swap_map); - vfree(cluster_info); - vfree(frontswap_map); + kvfree(cluster_info); + kvfree(frontswap_map); /* Destroy swap account information */ swap_cgroup_swapoff(p->type); exit_swap_address_space(p->type); @@ -2789,7 +2794,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) p->cluster_next = 1 + (prandom_u32() % p->highest_bit); nr_cluster = DIV_ROUND_UP(maxpages, SWAPFILE_CLUSTER); - cluster_info = vzalloc(nr_cluster * sizeof(*cluster_info)); + cluster_info = kvzalloc(nr_cluster * sizeof(*cluster_info), + GFP_KERNEL); if (!cluster_info) { error = -ENOMEM; goto bad_swap; @@ -2822,7 +2828,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags) } /* frontswap enabled? set up bit-per-page map for frontswap */ if (IS_ENABLED(CONFIG_FRONTSWAP)) - frontswap_map = vzalloc(BITS_TO_LONGS(maxpages) * sizeof(long)); + frontswap_map = kvzalloc(BITS_TO_LONGS(maxpages) * sizeof(long), + GFP_KERNEL); if (p->bdev &&(swap_flags & SWAP_FLAG_DISCARD) && swap_discardable(p)) { /* |
