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Date: Wed, 28 Mar 2018 15:06:23 +0200
From: Michal Hocko <mhocko@...nel.org>
To: Joe Perches <joe@...ches.com>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
Hugh Dickins <hughd@...gle.com>,
Christoph Lameter <cl@...ux.com>,
Pekka Enberg <penberg@...nel.org>,
David Rientjes <rientjes@...gle.com>,
Joonsoo Kim <iamjoonsoo.kim@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Minchan Kim <minchan@...nel.org>,
Nitin Gupta <ngupta@...are.org>,
Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
Seth Jennings <sjenning@...hat.com>,
Dan Streetman <ddstreet@...e.org>,
linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH] mm: Use octal not symbolic permissions
On Mon 26-03-18 15:22:32, Joe Perches wrote:
> mm/*.c files use symbolic and octal styles for permissions.
>
> Using octal and not symbolic permissions is preferred by many as more
> readable.
>
> https://lkml.org/lkml/2016/8/2/1945
>
> Prefer the direct use of octal for permissions.
>
> Done using
> $ scripts/checkpatch.pl -f --types=SYMBOLIC_PERMS --fix-inplace mm/*.c
> and some typing.
>
> Before: $ git grep -P -w "0[0-7]{3,3}" mm | wc -l
> 44
> After: $ git grep -P -w "0[0-7]{3,3}" mm | wc -l
> 86
Ohh, I absolutely detest those symbolic names. I always have to check
what they actually mean to be sure. Octal representation is quite
natural to read. So for once I am really happy about such a clean up
change.
Btw. something like this should be quite easy to automate via
coccinelle AFAIU.
> Miscellanea:
>
> o Whitespace neatening around these conversions.
>
> Signed-off-by: Joe Perches <joe@...ches.com>
I hope I haven't overlooked any potential mismatch...
Acked-by: Michal Hocko <mhocko@...e.com>
> ---
> mm/cleancache.c | 10 ++++------
> mm/cma_debug.c | 25 ++++++++++---------------
> mm/compaction.c | 2 +-
> mm/dmapool.c | 2 +-
> mm/failslab.c | 2 +-
> mm/frontswap.c | 11 +++++------
> mm/memblock.c | 9 ++++++---
> mm/page_alloc.c | 2 +-
> mm/page_idle.c | 2 +-
> mm/page_owner.c | 4 ++--
> mm/shmem.c | 9 +++++----
> mm/slab_common.c | 4 ++--
> mm/vmalloc.c | 2 +-
> mm/zsmalloc.c | 5 +++--
> mm/zswap.c | 38 +++++++++++++++++++-------------------
> 15 files changed, 62 insertions(+), 65 deletions(-)
>
> diff --git a/mm/cleancache.c b/mm/cleancache.c
> index f7b9fdc79d97..60d65448f4d0 100644
> --- a/mm/cleancache.c
> +++ b/mm/cleancache.c
> @@ -307,12 +307,10 @@ static int __init init_cleancache(void)
> struct dentry *root = debugfs_create_dir("cleancache", NULL);
> if (root == NULL)
> return -ENXIO;
> - debugfs_create_u64("succ_gets", S_IRUGO, root, &cleancache_succ_gets);
> - debugfs_create_u64("failed_gets", S_IRUGO,
> - root, &cleancache_failed_gets);
> - debugfs_create_u64("puts", S_IRUGO, root, &cleancache_puts);
> - debugfs_create_u64("invalidates", S_IRUGO,
> - root, &cleancache_invalidates);
> + debugfs_create_u64("succ_gets", 0444, root, &cleancache_succ_gets);
> + debugfs_create_u64("failed_gets", 0444, root, &cleancache_failed_gets);
> + debugfs_create_u64("puts", 0444, root, &cleancache_puts);
> + debugfs_create_u64("invalidates", 0444, root, &cleancache_invalidates);
> #endif
> return 0;
> }
> diff --git a/mm/cma_debug.c b/mm/cma_debug.c
> index 275df8b5b22e..f23467291cfb 100644
> --- a/mm/cma_debug.c
> +++ b/mm/cma_debug.c
> @@ -172,23 +172,18 @@ static void cma_debugfs_add_one(struct cma *cma, int idx)
>
> tmp = debugfs_create_dir(name, cma_debugfs_root);
>
> - debugfs_create_file("alloc", S_IWUSR, tmp, cma,
> - &cma_alloc_fops);
> -
> - debugfs_create_file("free", S_IWUSR, tmp, cma,
> - &cma_free_fops);
> -
> - debugfs_create_file("base_pfn", S_IRUGO, tmp,
> - &cma->base_pfn, &cma_debugfs_fops);
> - debugfs_create_file("count", S_IRUGO, tmp,
> - &cma->count, &cma_debugfs_fops);
> - debugfs_create_file("order_per_bit", S_IRUGO, tmp,
> - &cma->order_per_bit, &cma_debugfs_fops);
> - debugfs_create_file("used", S_IRUGO, tmp, cma, &cma_used_fops);
> - debugfs_create_file("maxchunk", S_IRUGO, tmp, cma, &cma_maxchunk_fops);
> + debugfs_create_file("alloc", 0200, tmp, cma, &cma_alloc_fops);
> + debugfs_create_file("free", 0200, tmp, cma, &cma_free_fops);
> + debugfs_create_file("base_pfn", 0444, tmp,
> + &cma->base_pfn, &cma_debugfs_fops);
> + debugfs_create_file("count", 0444, tmp, &cma->count, &cma_debugfs_fops);
> + debugfs_create_file("order_per_bit", 0444, tmp,
> + &cma->order_per_bit, &cma_debugfs_fops);
> + debugfs_create_file("used", 0444, tmp, cma, &cma_used_fops);
> + debugfs_create_file("maxchunk", 0444, tmp, cma, &cma_maxchunk_fops);
>
> u32s = DIV_ROUND_UP(cma_bitmap_maxno(cma), BITS_PER_BYTE * sizeof(u32));
> - debugfs_create_u32_array("bitmap", S_IRUGO, tmp, (u32*)cma->bitmap, u32s);
> + debugfs_create_u32_array("bitmap", 0444, tmp, (u32 *)cma->bitmap, u32s);
> }
>
> static int __init cma_debugfs_init(void)
> diff --git a/mm/compaction.c b/mm/compaction.c
> index 028b7210a669..1dd3e6b2d19e 100644
> --- a/mm/compaction.c
> +++ b/mm/compaction.c
> @@ -1897,7 +1897,7 @@ static ssize_t sysfs_compact_node(struct device *dev,
>
> return count;
> }
> -static DEVICE_ATTR(compact, S_IWUSR, NULL, sysfs_compact_node);
> +static DEVICE_ATTR(compact, 0200, NULL, sysfs_compact_node);
>
> int compaction_register_node(struct node *node)
> {
> diff --git a/mm/dmapool.c b/mm/dmapool.c
> index 4d90a64b2fdc..6d4b97e7e9e9 100644
> --- a/mm/dmapool.c
> +++ b/mm/dmapool.c
> @@ -105,7 +105,7 @@ show_pools(struct device *dev, struct device_attribute *attr, char *buf)
> return PAGE_SIZE - size;
> }
>
> -static DEVICE_ATTR(pools, S_IRUGO, show_pools, NULL);
> +static DEVICE_ATTR(pools, 0444, show_pools, NULL);
>
> /**
> * dma_pool_create - Creates a pool of consistent memory blocks, for dma.
> diff --git a/mm/failslab.c b/mm/failslab.c
> index 1f2f248e3601..b135ebb88b6f 100644
> --- a/mm/failslab.c
> +++ b/mm/failslab.c
> @@ -42,7 +42,7 @@ __setup("failslab=", setup_failslab);
> static int __init failslab_debugfs_init(void)
> {
> struct dentry *dir;
> - umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
> + umode_t mode = S_IFREG | 0600;
>
> dir = fault_create_debugfs_attr("failslab", NULL, &failslab.attr);
> if (IS_ERR(dir))
> diff --git a/mm/frontswap.c b/mm/frontswap.c
> index fec8b5044040..89942a323767 100644
> --- a/mm/frontswap.c
> +++ b/mm/frontswap.c
> @@ -486,12 +486,11 @@ static int __init init_frontswap(void)
> struct dentry *root = debugfs_create_dir("frontswap", NULL);
> if (root == NULL)
> return -ENXIO;
> - debugfs_create_u64("loads", S_IRUGO, root, &frontswap_loads);
> - debugfs_create_u64("succ_stores", S_IRUGO, root, &frontswap_succ_stores);
> - debugfs_create_u64("failed_stores", S_IRUGO, root,
> - &frontswap_failed_stores);
> - debugfs_create_u64("invalidates", S_IRUGO,
> - root, &frontswap_invalidates);
> + debugfs_create_u64("loads", 0444, root, &frontswap_loads);
> + debugfs_create_u64("succ_stores", 0444, root, &frontswap_succ_stores);
> + debugfs_create_u64("failed_stores", 0444, root,
> + &frontswap_failed_stores);
> + debugfs_create_u64("invalidates", 0444, root, &frontswap_invalidates);
> #endif
> return 0;
> }
> diff --git a/mm/memblock.c b/mm/memblock.c
> index 9b04568ad42a..8078eb8b5088 100644
> --- a/mm/memblock.c
> +++ b/mm/memblock.c
> @@ -1803,10 +1803,13 @@ static int __init memblock_init_debugfs(void)
> struct dentry *root = debugfs_create_dir("memblock", NULL);
> if (!root)
> return -ENXIO;
> - debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
> - debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
> + debugfs_create_file("memory", 0444, root,
> + &memblock.memory, &memblock_debug_fops);
> + debugfs_create_file("reserved", 0444, root,
> + &memblock.reserved, &memblock_debug_fops);
> #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
> - debugfs_create_file("physmem", S_IRUGO, root, &memblock.physmem, &memblock_debug_fops);
> + debugfs_create_file("physmem", 0444, root,
> + &memblock.physmem, &memblock_debug_fops);
> #endif
>
> return 0;
> diff --git a/mm/page_alloc.c b/mm/page_alloc.c
> index 905db9d7962f..fe827b099fb3 100644
> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -3086,7 +3086,7 @@ static bool should_fail_alloc_page(gfp_t gfp_mask, unsigned int order)
>
> static int __init fail_page_alloc_debugfs(void)
> {
> - umode_t mode = S_IFREG | S_IRUSR | S_IWUSR;
> + umode_t mode = S_IFREG | 0600;
> struct dentry *dir;
>
> dir = fault_create_debugfs_attr("fail_page_alloc", NULL,
> diff --git a/mm/page_idle.c b/mm/page_idle.c
> index e412a63b2b74..6302bc62c27d 100644
> --- a/mm/page_idle.c
> +++ b/mm/page_idle.c
> @@ -201,7 +201,7 @@ static ssize_t page_idle_bitmap_write(struct file *file, struct kobject *kobj,
> }
>
> static struct bin_attribute page_idle_bitmap_attr =
> - __BIN_ATTR(bitmap, S_IRUSR | S_IWUSR,
> + __BIN_ATTR(bitmap, 0600,
> page_idle_bitmap_read, page_idle_bitmap_write, 0);
>
> static struct bin_attribute *page_idle_bin_attrs[] = {
> diff --git a/mm/page_owner.c b/mm/page_owner.c
> index 77d9e791ae8a..c2494f034d02 100644
> --- a/mm/page_owner.c
> +++ b/mm/page_owner.c
> @@ -631,8 +631,8 @@ static int __init pageowner_init(void)
> return 0;
> }
>
> - dentry = debugfs_create_file("page_owner", S_IRUSR, NULL,
> - NULL, &proc_page_owner_operations);
> + dentry = debugfs_create_file("page_owner", 0400, NULL,
> + NULL, &proc_page_owner_operations);
>
> return PTR_ERR_OR_ZERO(dentry);
> }
> diff --git a/mm/shmem.c b/mm/shmem.c
> index a9b6d536b6f1..1d9b4c998738 100644
> --- a/mm/shmem.c
> +++ b/mm/shmem.c
> @@ -2998,7 +2998,8 @@ static int shmem_symlink(struct inode *dir, struct dentry *dentry, const char *s
> if (len > PAGE_SIZE)
> return -ENAMETOOLONG;
>
> - inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK|S_IRWXUGO, 0, VM_NORESERVE);
> + inode = shmem_get_inode(dir->i_sb, dir, S_IFLNK | 0777, 0,
> + VM_NORESERVE);
> if (!inode)
> return -ENOSPC;
>
> @@ -3421,7 +3422,7 @@ static int shmem_show_options(struct seq_file *seq, struct dentry *root)
> sbinfo->max_blocks << (PAGE_SHIFT - 10));
> if (sbinfo->max_inodes != shmem_default_max_inodes())
> seq_printf(seq, ",nr_inodes=%lu", sbinfo->max_inodes);
> - if (sbinfo->mode != (S_IRWXUGO | S_ISVTX))
> + if (sbinfo->mode != (0777 | S_ISVTX))
> seq_printf(seq, ",mode=%03ho", sbinfo->mode);
> if (!uid_eq(sbinfo->uid, GLOBAL_ROOT_UID))
> seq_printf(seq, ",uid=%u",
> @@ -3461,7 +3462,7 @@ int shmem_fill_super(struct super_block *sb, void *data, int silent)
> if (!sbinfo)
> return -ENOMEM;
>
> - sbinfo->mode = S_IRWXUGO | S_ISVTX;
> + sbinfo->mode = 0777 | S_ISVTX;
> sbinfo->uid = current_fsuid();
> sbinfo->gid = current_fsgid();
> sb->s_fs_info = sbinfo;
> @@ -3904,7 +3905,7 @@ static struct file *__shmem_file_setup(struct vfsmount *mnt, const char *name, l
> d_set_d_op(path.dentry, &anon_ops);
>
> res = ERR_PTR(-ENOSPC);
> - inode = shmem_get_inode(sb, NULL, S_IFREG | S_IRWXUGO, 0, flags);
> + inode = shmem_get_inode(sb, NULL, S_IFREG | 0777, 0, flags);
> if (!inode)
> goto put_memory;
>
> diff --git a/mm/slab_common.c b/mm/slab_common.c
> index 61ab2ca8bea7..d315e6cb4b61 100644
> --- a/mm/slab_common.c
> +++ b/mm/slab_common.c
> @@ -1231,9 +1231,9 @@ void cache_random_seq_destroy(struct kmem_cache *cachep)
>
> #if defined(CONFIG_SLAB) || defined(CONFIG_SLUB_DEBUG)
> #ifdef CONFIG_SLAB
> -#define SLABINFO_RIGHTS (S_IWUSR | S_IRUSR)
> +#define SLABINFO_RIGHTS (0600)
> #else
> -#define SLABINFO_RIGHTS S_IRUSR
> +#define SLABINFO_RIGHTS (0400)
> #endif
>
> static void print_slabinfo_header(struct seq_file *m)
> diff --git a/mm/vmalloc.c b/mm/vmalloc.c
> index ebff729cc956..7d11db35e350 100644
> --- a/mm/vmalloc.c
> +++ b/mm/vmalloc.c
> @@ -2769,7 +2769,7 @@ static const struct file_operations proc_vmalloc_operations = {
>
> static int __init proc_vmalloc_init(void)
> {
> - proc_create("vmallocinfo", S_IRUSR, NULL, &proc_vmalloc_operations);
> + proc_create("vmallocinfo", 0400, NULL, &proc_vmalloc_operations);
> return 0;
> }
> module_init(proc_vmalloc_init);
> diff --git a/mm/zsmalloc.c b/mm/zsmalloc.c
> index 61cb05dc950c..8d87e973a4f5 100644
> --- a/mm/zsmalloc.c
> +++ b/mm/zsmalloc.c
> @@ -661,8 +661,9 @@ static void zs_pool_stat_create(struct zs_pool *pool, const char *name)
> }
> pool->stat_dentry = entry;
>
> - entry = debugfs_create_file("classes", S_IFREG | S_IRUGO,
> - pool->stat_dentry, pool, &zs_stats_size_fops);
> + entry = debugfs_create_file("classes", S_IFREG | 0444,
> + pool->stat_dentry, pool,
> + &zs_stats_size_fops);
> if (!entry) {
> pr_warn("%s: debugfs file entry <%s> creation failed\n",
> name, "classes");
> diff --git a/mm/zswap.c b/mm/zswap.c
> index 61a5c41972db..7d34e69507e3 100644
> --- a/mm/zswap.c
> +++ b/mm/zswap.c
> @@ -1256,26 +1256,26 @@ static int __init zswap_debugfs_init(void)
> if (!zswap_debugfs_root)
> return -ENOMEM;
>
> - debugfs_create_u64("pool_limit_hit", S_IRUGO,
> - zswap_debugfs_root, &zswap_pool_limit_hit);
> - debugfs_create_u64("reject_reclaim_fail", S_IRUGO,
> - zswap_debugfs_root, &zswap_reject_reclaim_fail);
> - debugfs_create_u64("reject_alloc_fail", S_IRUGO,
> - zswap_debugfs_root, &zswap_reject_alloc_fail);
> - debugfs_create_u64("reject_kmemcache_fail", S_IRUGO,
> - zswap_debugfs_root, &zswap_reject_kmemcache_fail);
> - debugfs_create_u64("reject_compress_poor", S_IRUGO,
> - zswap_debugfs_root, &zswap_reject_compress_poor);
> - debugfs_create_u64("written_back_pages", S_IRUGO,
> - zswap_debugfs_root, &zswap_written_back_pages);
> - debugfs_create_u64("duplicate_entry", S_IRUGO,
> - zswap_debugfs_root, &zswap_duplicate_entry);
> - debugfs_create_u64("pool_total_size", S_IRUGO,
> - zswap_debugfs_root, &zswap_pool_total_size);
> - debugfs_create_atomic_t("stored_pages", S_IRUGO,
> - zswap_debugfs_root, &zswap_stored_pages);
> + debugfs_create_u64("pool_limit_hit", 0444,
> + zswap_debugfs_root, &zswap_pool_limit_hit);
> + debugfs_create_u64("reject_reclaim_fail", 0444,
> + zswap_debugfs_root, &zswap_reject_reclaim_fail);
> + debugfs_create_u64("reject_alloc_fail", 0444,
> + zswap_debugfs_root, &zswap_reject_alloc_fail);
> + debugfs_create_u64("reject_kmemcache_fail", 0444,
> + zswap_debugfs_root, &zswap_reject_kmemcache_fail);
> + debugfs_create_u64("reject_compress_poor", 0444,
> + zswap_debugfs_root, &zswap_reject_compress_poor);
> + debugfs_create_u64("written_back_pages", 0444,
> + zswap_debugfs_root, &zswap_written_back_pages);
> + debugfs_create_u64("duplicate_entry", 0444,
> + zswap_debugfs_root, &zswap_duplicate_entry);
> + debugfs_create_u64("pool_total_size", 0444,
> + zswap_debugfs_root, &zswap_pool_total_size);
> + debugfs_create_atomic_t("stored_pages", 0444,
> + zswap_debugfs_root, &zswap_stored_pages);
> debugfs_create_atomic_t("same_filled_pages", 0444,
> - zswap_debugfs_root, &zswap_same_filled_pages);
> + zswap_debugfs_root, &zswap_same_filled_pages);
>
> return 0;
> }
> --
> 2.15.0
--
Michal Hocko
SUSE Labs
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