X-Git-Url: https://git.stricted.de/?a=blobdiff_plain;f=fs%2Finode.c;h=b33ba8e021cc286d500d94abd64d8f85115ebcd2;hb=71e996bef90b23919f627a38367b9e8b44b77d37;hp=93a0625b46e490252c03dab43310919763a8eca9;hpb=1025c04cecd19882e28f16c4004034b475c372c5;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git diff --git a/fs/inode.c b/fs/inode.c index 93a0625b46e4..b33ba8e021cc 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -17,6 +17,7 @@ #include #include /* for inode_has_buffers */ #include +#include #include "internal.h" /* @@ -24,7 +25,7 @@ * * inode->i_lock protects: * inode->i_state, inode->i_hash, __iget() - * inode->i_sb->s_inode_lru_lock protects: + * Inode LRU list locks protect: * inode->i_sb->s_inode_lru, inode->i_lru * inode_sb_list_lock protects: * sb->s_inodes, inode->i_sb_list @@ -37,7 +38,7 @@ * * inode_sb_list_lock * inode->i_lock - * inode->i_sb->s_inode_lru_lock + * Inode LRU list locks * * bdi->wb.list_lock * inode->i_lock @@ -70,33 +71,33 @@ EXPORT_SYMBOL(empty_aops); */ struct inodes_stat_t inodes_stat; -static DEFINE_PER_CPU(unsigned int, nr_inodes); -static DEFINE_PER_CPU(unsigned int, nr_unused); +static DEFINE_PER_CPU(unsigned long, nr_inodes); +static DEFINE_PER_CPU(unsigned long, nr_unused); static struct kmem_cache *inode_cachep __read_mostly; -static int get_nr_inodes(void) +static long get_nr_inodes(void) { int i; - int sum = 0; + long sum = 0; for_each_possible_cpu(i) sum += per_cpu(nr_inodes, i); return sum < 0 ? 0 : sum; } -static inline int get_nr_inodes_unused(void) +static inline long get_nr_inodes_unused(void) { int i; - int sum = 0; + long sum = 0; for_each_possible_cpu(i) sum += per_cpu(nr_unused, i); return sum < 0 ? 0 : sum; } -int get_nr_dirty_inodes(void) +long get_nr_dirty_inodes(void) { /* not actually dirty inodes, but a wild approximation */ - int nr_dirty = get_nr_inodes() - get_nr_inodes_unused(); + long nr_dirty = get_nr_inodes() - get_nr_inodes_unused(); return nr_dirty > 0 ? nr_dirty : 0; } @@ -109,7 +110,7 @@ int proc_nr_inodes(ctl_table *table, int write, { inodes_stat.nr_inodes = get_nr_inodes(); inodes_stat.nr_unused = get_nr_inodes_unused(); - return proc_dointvec(table, write, buffer, lenp, ppos); + return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); } #endif @@ -401,13 +402,8 @@ EXPORT_SYMBOL(ihold); static void inode_lru_list_add(struct inode *inode) { - spin_lock(&inode->i_sb->s_inode_lru_lock); - if (list_empty(&inode->i_lru)) { - list_add(&inode->i_lru, &inode->i_sb->s_inode_lru); - inode->i_sb->s_nr_inodes_unused++; + if (list_lru_add(&inode->i_sb->s_inode_lru, &inode->i_lru)) this_cpu_inc(nr_unused); - } - spin_unlock(&inode->i_sb->s_inode_lru_lock); } /* @@ -425,13 +421,9 @@ void inode_add_lru(struct inode *inode) static void inode_lru_list_del(struct inode *inode) { - spin_lock(&inode->i_sb->s_inode_lru_lock); - if (!list_empty(&inode->i_lru)) { - list_del_init(&inode->i_lru); - inode->i_sb->s_nr_inodes_unused--; + + if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru)) this_cpu_dec(nr_unused); - } - spin_unlock(&inode->i_sb->s_inode_lru_lock); } /** @@ -675,24 +667,8 @@ int invalidate_inodes(struct super_block *sb, bool kill_dirty) return busy; } -static int can_unuse(struct inode *inode) -{ - if (inode->i_state & ~I_REFERENCED) - return 0; - if (inode_has_buffers(inode)) - return 0; - if (atomic_read(&inode->i_count)) - return 0; - if (inode->i_data.nrpages) - return 0; - return 1; -} - /* - * Walk the superblock inode LRU for freeable inodes and attempt to free them. - * This is called from the superblock shrinker function with a number of inodes - * to trim from the LRU. Inodes to be freed are moved to a temporary list and - * then are freed outside inode_lock by dispose_list(). + * Isolate the inode from the LRU in preparation for freeing it. * * Any inodes which are pinned purely because of attached pagecache have their * pagecache removed. If the inode has metadata buffers attached to @@ -706,89 +682,82 @@ static int can_unuse(struct inode *inode) * LRU does not have strict ordering. Hence we don't want to reclaim inodes * with this flag set because they are the inodes that are out of order. */ -void prune_icache_sb(struct super_block *sb, int nr_to_scan) +static enum lru_status +inode_lru_isolate(struct list_head *item, spinlock_t *lru_lock, void *arg) { - LIST_HEAD(freeable); - int nr_scanned; - unsigned long reap = 0; + struct list_head *freeable = arg; + struct inode *inode = container_of(item, struct inode, i_lru); - spin_lock(&sb->s_inode_lru_lock); - for (nr_scanned = nr_to_scan; nr_scanned >= 0; nr_scanned--) { - struct inode *inode; + /* + * we are inverting the lru lock/inode->i_lock here, so use a trylock. + * If we fail to get the lock, just skip it. + */ + if (!spin_trylock(&inode->i_lock)) + return LRU_SKIP; - if (list_empty(&sb->s_inode_lru)) - break; + /* + * Referenced or dirty inodes are still in use. Give them another pass + * through the LRU as we canot reclaim them now. + */ + if (atomic_read(&inode->i_count) || + (inode->i_state & ~I_REFERENCED)) { + list_del_init(&inode->i_lru); + spin_unlock(&inode->i_lock); + this_cpu_dec(nr_unused); + return LRU_REMOVED; + } - inode = list_entry(sb->s_inode_lru.prev, struct inode, i_lru); + /* recently referenced inodes get one more pass */ + if (inode->i_state & I_REFERENCED) { + inode->i_state &= ~I_REFERENCED; + spin_unlock(&inode->i_lock); + return LRU_ROTATE; + } - /* - * we are inverting the sb->s_inode_lru_lock/inode->i_lock here, - * so use a trylock. If we fail to get the lock, just move the - * inode to the back of the list so we don't spin on it. - */ - if (!spin_trylock(&inode->i_lock)) { - list_move(&inode->i_lru, &sb->s_inode_lru); - continue; + if (inode_has_buffers(inode) || inode->i_data.nrpages) { + __iget(inode); + spin_unlock(&inode->i_lock); + spin_unlock(lru_lock); + if (remove_inode_buffers(inode)) { + unsigned long reap; + reap = invalidate_mapping_pages(&inode->i_data, 0, -1); + if (current_is_kswapd()) + __count_vm_events(KSWAPD_INODESTEAL, reap); + else + __count_vm_events(PGINODESTEAL, reap); + if (current->reclaim_state) + current->reclaim_state->reclaimed_slab += reap; } + iput(inode); + spin_lock(lru_lock); + return LRU_RETRY; + } - /* - * Referenced or dirty inodes are still in use. Give them - * another pass through the LRU as we canot reclaim them now. - */ - if (atomic_read(&inode->i_count) || - (inode->i_state & ~I_REFERENCED)) { - list_del_init(&inode->i_lru); - spin_unlock(&inode->i_lock); - sb->s_nr_inodes_unused--; - this_cpu_dec(nr_unused); - continue; - } + WARN_ON(inode->i_state & I_NEW); + inode->i_state |= I_FREEING; + list_move(&inode->i_lru, freeable); + spin_unlock(&inode->i_lock); - /* recently referenced inodes get one more pass */ - if (inode->i_state & I_REFERENCED) { - inode->i_state &= ~I_REFERENCED; - list_move(&inode->i_lru, &sb->s_inode_lru); - spin_unlock(&inode->i_lock); - continue; - } - if (inode_has_buffers(inode) || inode->i_data.nrpages) { - __iget(inode); - spin_unlock(&inode->i_lock); - spin_unlock(&sb->s_inode_lru_lock); - if (remove_inode_buffers(inode)) - reap += invalidate_mapping_pages(&inode->i_data, - 0, -1); - iput(inode); - spin_lock(&sb->s_inode_lru_lock); - - if (inode != list_entry(sb->s_inode_lru.next, - struct inode, i_lru)) - continue; /* wrong inode or list_empty */ - /* avoid lock inversions with trylock */ - if (!spin_trylock(&inode->i_lock)) - continue; - if (!can_unuse(inode)) { - spin_unlock(&inode->i_lock); - continue; - } - } - WARN_ON(inode->i_state & I_NEW); - inode->i_state |= I_FREEING; - spin_unlock(&inode->i_lock); + this_cpu_dec(nr_unused); + return LRU_REMOVED; +} - list_move(&inode->i_lru, &freeable); - sb->s_nr_inodes_unused--; - this_cpu_dec(nr_unused); - } - if (current_is_kswapd()) - __count_vm_events(KSWAPD_INODESTEAL, reap); - else - __count_vm_events(PGINODESTEAL, reap); - spin_unlock(&sb->s_inode_lru_lock); - if (current->reclaim_state) - current->reclaim_state->reclaimed_slab += reap; +/* + * Walk the superblock inode LRU for freeable inodes and attempt to free them. + * This is called from the superblock shrinker function with a number of inodes + * to trim from the LRU. Inodes to be freed are moved to a temporary list and + * then are freed outside inode_lock by dispose_list(). + */ +long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan, + int nid) +{ + LIST_HEAD(freeable); + long freed; + freed = list_lru_walk_node(&sb->s_inode_lru, nid, inode_lru_isolate, + &freeable, &nr_to_scan); dispose_list(&freeable); + return freed; } static void __wait_on_freeing_inode(struct inode *inode);