Re: [PATCH v5 4/4] btrfs: sysfs: export supported checksums

[kbuild test robot <lkp@intel.com>]

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Hi Johannes,

I love your patch! Yet something to improve:

[auto build test ERROR on linus/master]
[cannot apply to v5.3-rc6 next-20190830]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Johannes-Thumshirn/btrfs-turn-checksum-type-define-into-a-enum/20190831-103832
config: i386-randconfig-a003-201934 (attached as .config)
compiler: gcc-6 (Debian 6.3.0-18+deb9u1) 6.3.0 20170516
reproduce:
        # save the attached .config to linux build tree
        make ARCH=i386 

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

   In file included from arch/x86/include/asm/percpu.h:45:0,
                    from arch/x86/include/asm/current.h:6,
                    from include/linux/sched.h:12,
                    from fs/btrfs/sysfs.c:6:
   fs/btrfs/sysfs.c: In function 'btrfs_supported_checksums_show':
>> fs/btrfs/sysfs.c:192:29: error: 'btrfs_csums' undeclared (first use in this function)
     for (i = 0; i < ARRAY_SIZE(btrfs_csums); i++) {
                                ^
   include/linux/kernel.h:47:33: note: in definition of macro 'ARRAY_SIZE'
    #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
                                    ^~~
   fs/btrfs/sysfs.c:192:29: note: each undeclared identifier is reported only once for each function it appears in
     for (i = 0; i < ARRAY_SIZE(btrfs_csums); i++) {
                                ^
   include/linux/kernel.h:47:33: note: in definition of macro 'ARRAY_SIZE'
    #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
                                    ^~~
   In file included from include/linux/kernel.h:16:0,
                    from arch/x86/include/asm/percpu.h:45,
                    from arch/x86/include/asm/current.h:6,
                    from include/linux/sched.h:12,
                    from fs/btrfs/sysfs.c:6:
   include/linux/build_bug.h:16:45: error: bit-field '<anonymous>' width not an integer constant
    #define BUILD_BUG_ON_ZERO(e) (sizeof(struct { int:(-!!(e)); }))
                                                ^
   include/linux/compiler.h:357:28: note: in expansion of macro 'BUILD_BUG_ON_ZERO'
    #define __must_be_array(a) BUILD_BUG_ON_ZERO(__same_type((a), &(a)[0]))
                               ^~~~~~~~~~~~~~~~~
   include/linux/kernel.h:47:59: note: in expansion of macro '__must_be_array'
    #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))
                                                              ^~~~~~~~~~~~~~~
   fs/btrfs/sysfs.c:192:18: note: in expansion of macro 'ARRAY_SIZE'
     for (i = 0; i < ARRAY_SIZE(btrfs_csums); i++) {
                     ^~~~~~~~~~

vim +/btrfs_csums +192 fs/btrfs/sysfs.c

   > 6	#include <linux/sched.h>
     7	#include <linux/slab.h>
     8	#include <linux/spinlock.h>
     9	#include <linux/completion.h>
    10	#include <linux/kobject.h>
    11	#include <linux/bug.h>
    12	#include <linux/debugfs.h>
    13	
    14	#include "ctree.h"
    15	#include "disk-io.h"
    16	#include "transaction.h"
    17	#include "sysfs.h"
    18	#include "volumes.h"
    19	#include "space-info.h"
    20	
    21	static inline struct btrfs_fs_info *to_fs_info(struct kobject *kobj);
    22	static inline struct btrfs_fs_devices *to_fs_devs(struct kobject *kobj);
    23	
    24	static u64 get_features(struct btrfs_fs_info *fs_info,
    25				enum btrfs_feature_set set)
    26	{
    27		struct btrfs_super_block *disk_super = fs_info->super_copy;
    28		if (set == FEAT_COMPAT)
    29			return btrfs_super_compat_flags(disk_super);
    30		else if (set == FEAT_COMPAT_RO)
    31			return btrfs_super_compat_ro_flags(disk_super);
    32		else
    33			return btrfs_super_incompat_flags(disk_super);
    34	}
    35	
    36	static void set_features(struct btrfs_fs_info *fs_info,
    37				 enum btrfs_feature_set set, u64 features)
    38	{
    39		struct btrfs_super_block *disk_super = fs_info->super_copy;
    40		if (set == FEAT_COMPAT)
    41			btrfs_set_super_compat_flags(disk_super, features);
    42		else if (set == FEAT_COMPAT_RO)
    43			btrfs_set_super_compat_ro_flags(disk_super, features);
    44		else
    45			btrfs_set_super_incompat_flags(disk_super, features);
    46	}
    47	
    48	static int can_modify_feature(struct btrfs_feature_attr *fa)
    49	{
    50		int val = 0;
    51		u64 set, clear;
    52		switch (fa->feature_set) {
    53		case FEAT_COMPAT:
    54			set = BTRFS_FEATURE_COMPAT_SAFE_SET;
    55			clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
    56			break;
    57		case FEAT_COMPAT_RO:
    58			set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
    59			clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
    60			break;
    61		case FEAT_INCOMPAT:
    62			set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
    63			clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
    64			break;
    65		default:
    66			pr_warn("btrfs: sysfs: unknown feature set %d\n",
    67					fa->feature_set);
    68			return 0;
    69		}
    70	
    71		if (set & fa->feature_bit)
    72			val |= 1;
    73		if (clear & fa->feature_bit)
    74			val |= 2;
    75	
    76		return val;
    77	}
    78	
    79	static ssize_t btrfs_feature_attr_show(struct kobject *kobj,
    80					       struct kobj_attribute *a, char *buf)
    81	{
    82		int val = 0;
    83		struct btrfs_fs_info *fs_info = to_fs_info(kobj);
    84		struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
    85		if (fs_info) {
    86			u64 features = get_features(fs_info, fa->feature_set);
    87			if (features & fa->feature_bit)
    88				val = 1;
    89		} else
    90			val = can_modify_feature(fa);
    91	
    92		return snprintf(buf, PAGE_SIZE, "%d\n", val);
    93	}
    94	
    95	static ssize_t btrfs_feature_attr_store(struct kobject *kobj,
    96						struct kobj_attribute *a,
    97						const char *buf, size_t count)
    98	{
    99		struct btrfs_fs_info *fs_info;
   100		struct btrfs_feature_attr *fa = to_btrfs_feature_attr(a);
   101		u64 features, set, clear;
   102		unsigned long val;
   103		int ret;
   104	
   105		fs_info = to_fs_info(kobj);
   106		if (!fs_info)
   107			return -EPERM;
   108	
   109		if (sb_rdonly(fs_info->sb))
   110			return -EROFS;
   111	
   112		ret = kstrtoul(skip_spaces(buf), 0, &val);
   113		if (ret)
   114			return ret;
   115	
   116		if (fa->feature_set == FEAT_COMPAT) {
   117			set = BTRFS_FEATURE_COMPAT_SAFE_SET;
   118			clear = BTRFS_FEATURE_COMPAT_SAFE_CLEAR;
   119		} else if (fa->feature_set == FEAT_COMPAT_RO) {
   120			set = BTRFS_FEATURE_COMPAT_RO_SAFE_SET;
   121			clear = BTRFS_FEATURE_COMPAT_RO_SAFE_CLEAR;
   122		} else {
   123			set = BTRFS_FEATURE_INCOMPAT_SAFE_SET;
   124			clear = BTRFS_FEATURE_INCOMPAT_SAFE_CLEAR;
   125		}
   126	
   127		features = get_features(fs_info, fa->feature_set);
   128	
   129		/* Nothing to do */
   130		if ((val && (features & fa->feature_bit)) ||
   131		    (!val && !(features & fa->feature_bit)))
   132			return count;
   133	
   134		if ((val && !(set & fa->feature_bit)) ||
   135		    (!val && !(clear & fa->feature_bit))) {
   136			btrfs_info(fs_info,
   137				"%sabling feature %s on mounted fs is not supported.",
   138				val ? "En" : "Dis", fa->kobj_attr.attr.name);
   139			return -EPERM;
   140		}
   141	
   142		btrfs_info(fs_info, "%s %s feature flag",
   143			   val ? "Setting" : "Clearing", fa->kobj_attr.attr.name);
   144	
   145		spin_lock(&fs_info->super_lock);
   146		features = get_features(fs_info, fa->feature_set);
   147		if (val)
   148			features |= fa->feature_bit;
   149		else
   150			features &= ~fa->feature_bit;
   151		set_features(fs_info, fa->feature_set, features);
   152		spin_unlock(&fs_info->super_lock);
   153	
   154		/*
   155		 * We don't want to do full transaction commit from inside sysfs
   156		 */
   157		btrfs_set_pending(fs_info, COMMIT);
   158		wake_up_process(fs_info->transaction_kthread);
   159	
   160		return count;
   161	}
   162	
   163	static umode_t btrfs_feature_visible(struct kobject *kobj,
   164					     struct attribute *attr, int unused)
   165	{
   166		struct btrfs_fs_info *fs_info = to_fs_info(kobj);
   167		umode_t mode = attr->mode;
   168	
   169		if (fs_info) {
   170			struct btrfs_feature_attr *fa;
   171			u64 features;
   172	
   173			fa = attr_to_btrfs_feature_attr(attr);
   174			features = get_features(fs_info, fa->feature_set);
   175	
   176			if (can_modify_feature(fa))
   177				mode |= S_IWUSR;
   178			else if (!(features & fa->feature_bit))
   179				mode = 0;
   180		}
   181	
   182		return mode;
   183	}
   184	
   185	static ssize_t btrfs_supported_checksums_show(struct kobject *kobj,
   186						      struct kobj_attribute *a,
   187						      char *buf)
   188	{
   189		ssize_t ret = 0;
   190		int i;
   191	
 > 192		for (i = 0; i < ARRAY_SIZE(btrfs_csums); i++) {
   193			ret += snprintf(buf + ret, PAGE_SIZE - ret, "%s%s",
   194					(i == 0 ? "" : ", "),
   195					btrfs_csums[i].name);
   196	
   197		}
   198	
   199		ret += snprintf(buf + ret, PAGE_SIZE - ret, "\n");
   200		return ret;
   201	}
   202	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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