/* * The ARC has requested that the filesystem drop entries from the dentry * and inode caches. This can occur when the ARC needs to free meta data * blocks but can't because they are all pinned by entries in these caches. */ int zfs_sb_prune(struct super_block *sb, unsigned long nr_to_scan, int *objects) { zfs_sb_t *zsb = sb->s_fs_info; int error = 0; #if defined(HAVE_SHRINK) || defined(HAVE_SPLIT_SHRINKER_CALLBACK) struct shrinker *shrinker = &sb->s_shrink; struct shrink_control sc = { .nr_to_scan = nr_to_scan, .gfp_mask = GFP_KERNEL, }; #endif ZFS_ENTER(zsb); #if defined(HAVE_SPLIT_SHRINKER_CALLBACK) && \ defined(SHRINK_CONTROL_HAS_NID) && \ defined(SHRINKER_NUMA_AWARE) if (sb->s_shrink.flags & SHRINKER_NUMA_AWARE) { *objects = 0; for_each_online_node(sc.nid) *objects += (*shrinker->scan_objects)(shrinker, &sc); } else { *objects = (*shrinker->scan_objects)(shrinker, &sc); } #elif defined(HAVE_SPLIT_SHRINKER_CALLBACK) *objects = (*shrinker->scan_objects)(shrinker, &sc); #elif defined(HAVE_SHRINK) *objects = (*shrinker->shrink)(shrinker, &sc); #elif defined(HAVE_D_PRUNE_ALIASES) #define D_PRUNE_ALIASES_IS_DEFAULT *objects = zfs_sb_prune_aliases(zsb, nr_to_scan); #else #error "No available dentry and inode cache pruning mechanism." #endif #if defined(HAVE_D_PRUNE_ALIASES) && !defined(D_PRUNE_ALIASES_IS_DEFAULT) #undef D_PRUNE_ALIASES_IS_DEFAULT /* * Fall back to zfs_sb_prune_aliases if the kernel's per-superblock * shrinker couldn't free anything, possibly due to the inodes being * allocated in a different memcg. */ if (*objects == 0) *objects = zfs_sb_prune_aliases(zsb, nr_to_scan); #endif ZFS_EXIT(zsb); dprintf_ds(zsb->z_os->os_dsl_dataset, "pruning, nr_to_scan=%lu objects=%d error=%d\n", nr_to_scan, *objects, error); return (error); }
/* * The ARC has requested that the filesystem drop entries from the dentry * and inode caches. This can occur when the ARC needs to free meta data * blocks but can't because they are all pinned by entries in these caches. */ int zfs_sb_prune(struct super_block *sb, unsigned long nr_to_scan, int *objects) { zfs_sb_t *zsb = sb->s_fs_info; int error = 0; #if defined(HAVE_SHRINK) || defined(HAVE_SPLIT_SHRINKER_CALLBACK) struct shrinker *shrinker = &sb->s_shrink; struct shrink_control sc = { .nr_to_scan = nr_to_scan, .gfp_mask = GFP_KERNEL, }; #endif ZFS_ENTER(zsb); #if defined(HAVE_SPLIT_SHRINKER_CALLBACK) && \ defined(SHRINK_CONTROL_HAS_NID) && \ defined(SHRINKER_NUMA_AWARE) if (sb->s_shrink.flags & SHRINKER_NUMA_AWARE) { *objects = 0; for_each_online_node(sc.nid) *objects += (*shrinker->scan_objects)(shrinker, &sc); } else { *objects = (*shrinker->scan_objects)(shrinker, &sc); } #elif defined(HAVE_SPLIT_SHRINKER_CALLBACK) *objects = (*shrinker->scan_objects)(shrinker, &sc); #elif defined(HAVE_SHRINK) *objects = (*shrinker->shrink)(shrinker, &sc); #elif defined(HAVE_D_PRUNE_ALIASES) *objects = zfs_sb_prune_aliases(zsb, nr_to_scan); #else #error "No available dentry and inode cache pruning mechanism." #endif ZFS_EXIT(zsb); dprintf_ds(zsb->z_os->os_dsl_dataset, "pruning, nr_to_scan=%lu objects=%d error=%d\n", nr_to_scan, *objects, error); return (error); }