f2fs: rework fault injection handling to avoid a warning

When CONFIG_F2FS_FAULT_INJECTION is disabled, we get a warning about an
unused label:

fs/f2fs/segment.c: In function '__submit_discard_cmd':
fs/f2fs/segment.c:1059:1: error: label 'submit' defined but not used [-Werror=unused-label]

This could be fixed by adding another #ifdef around it, but the more
reliable way of doing this seems to be to remove the other #ifdefs
where that is easily possible.

By defining time_to_inject() as a trivial stub, most of the checks for
CONFIG_F2FS_FAULT_INJECTION can go away. This also leads to nicer
formatting of the code.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Reviewed-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

10 files changed, 32 insertions, 46 deletions

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index 3ab7a00c0641..e8b6b89bddb8 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -555,13 +555,12 @@ int f2fs_acquire_orphan_inode(struct f2fs_sb_info *sbi)
 
         spin_lock(&im->ino_lock);
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_ORPHAN)) {
                 spin_unlock(&im->ino_lock);
                 f2fs_show_injection_info(FAULT_ORPHAN);
                 return -ENOSPC;
         }
-#endif
+
         if (unlikely(im->ino_num >= sbi->max_orphans))
                 err = -ENOSPC;
         else
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 45f043ee48bd..43d3723dc886 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -126,12 +126,10 @@ static bool f2fs_bio_post_read_required(struct bio *bio)
 
 static void f2fs_read_end_io(struct bio *bio)
 {
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(F2FS_P_SB(bio_first_page_all(bio)), FAULT_IO)) {
                 f2fs_show_injection_info(FAULT_IO);
                 bio->bi_status = BLK_STS_IOERR;
         }
-#endif
 
         if (f2fs_bio_post_read_required(bio)) {
                 struct bio_post_read_ctx *ctx = bio->bi_private;
diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 7f955c4e86a4..ecc3a4e2be96 100644
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -517,12 +517,11 @@ int f2fs_add_regular_entry(struct inode *dir, const struct qstr *new_name,
         }
 
 start:
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(F2FS_I_SB(dir), FAULT_DIR_DEPTH)) {
                 f2fs_show_injection_info(FAULT_DIR_DEPTH);
                 return -ENOSPC;
         }
-#endif
+
         if (unlikely(current_depth == MAX_DIR_HASH_DEPTH))
                 return -ENOSPC;
 
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 375aa9f30cfa..9a6ba4a8d338 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -41,7 +41,6 @@
         } while (0)
 #endif
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
 enum {
         FAULT_KMALLOC,
         FAULT_KVMALLOC,
@@ -60,6 +59,7 @@ enum {
         FAULT_MAX,
 };
 
+#ifdef CONFIG_F2FS_FAULT_INJECTION
 #define F2FS_ALL_FAULT_TYPE             ((1 << FAULT_MAX) - 1)
 
 struct f2fs_fault_info {
@@ -1324,6 +1324,12 @@ static inline bool time_to_inject(struct f2fs_sb_info *sbi, int type)
         }
         return false;
 }
+#else
+#define f2fs_show_injection_info(type) do { } while (0)
+static inline bool time_to_inject(struct f2fs_sb_info *sbi, int type)
+{
+        return false;
+}
 #endif
 
 /* For write statistics. Suppose sector size is 512 bytes,
@@ -1676,13 +1682,12 @@ static inline int inc_valid_block_count(struct f2fs_sb_info *sbi,
         if (ret)
                 return ret;
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_BLOCK)) {
                 f2fs_show_injection_info(FAULT_BLOCK);
                 release = *count;
                 goto enospc;
         }
-#endif
+
         /*
          * let's increase this in prior to actual block count change in order
          * for f2fs_sync_file to avoid data races when deciding checkpoint.
@@ -1891,12 +1896,10 @@ static inline int inc_valid_node_count(struct f2fs_sb_info *sbi,
                         return ret;
         }
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_BLOCK)) {
                 f2fs_show_injection_info(FAULT_BLOCK);
                 goto enospc;
         }
-#endif
 
         spin_lock(&sbi->stat_lock);
 
@@ -1981,22 +1984,23 @@ static inline s64 valid_inode_count(struct f2fs_sb_info *sbi)
 static inline struct page *f2fs_grab_cache_page(struct address_space *mapping,
                                                 pgoff_t index, bool for_write)
 {
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         struct page *page;
 
-        if (!for_write)
-                page = find_get_page_flags(mapping, index,
-                                                FGP_LOCK | FGP_ACCESSED);
-        else
-                page = find_lock_page(mapping, index);
-        if (page)
-                return page;
+        if (IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION)) {
+                if (!for_write)
+                        page = find_get_page_flags(mapping, index,
+                                                        FGP_LOCK | FGP_ACCESSED);
+                else
+                        page = find_lock_page(mapping, index);
+                if (page)
+                        return page;
 
-        if (time_to_inject(F2FS_M_SB(mapping), FAULT_PAGE_ALLOC)) {
-                f2fs_show_injection_info(FAULT_PAGE_ALLOC);
-                return NULL;
+                if (time_to_inject(F2FS_M_SB(mapping), FAULT_PAGE_ALLOC)) {
+                        f2fs_show_injection_info(FAULT_PAGE_ALLOC);
+                        return NULL;
+                }
         }
-#endif
+
         if (!for_write)
                 return grab_cache_page(mapping, index);
         return grab_cache_page_write_begin(mapping, index, AOP_FLAG_NOFS);
@@ -2006,12 +2010,11 @@ static inline struct page *f2fs_pagecache_get_page(
                                 struct address_space *mapping, pgoff_t index,
                                 int fgp_flags, gfp_t gfp_mask)
 {
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(F2FS_M_SB(mapping), FAULT_PAGE_GET)) {
                 f2fs_show_injection_info(FAULT_PAGE_GET);
                 return NULL;
         }
-#endif
+
         return pagecache_get_page(mapping, index, fgp_flags, gfp_mask);
 }
 
@@ -2076,12 +2079,11 @@ static inline struct bio *f2fs_bio_alloc(struct f2fs_sb_info *sbi,
                         bio = bio_alloc(GFP_NOIO | __GFP_NOFAIL, npages);
                 return bio;
         }
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_ALLOC_BIO)) {
                 f2fs_show_injection_info(FAULT_ALLOC_BIO);
                 return NULL;
         }
-#endif
+
         return bio_alloc(GFP_KERNEL, npages);
 }
 
@@ -2616,12 +2618,11 @@ static inline bool f2fs_may_extent_tree(struct inode *inode)
 static inline void *f2fs_kmalloc(struct f2fs_sb_info *sbi,
                                         size_t size, gfp_t flags)
 {
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_KMALLOC)) {
                 f2fs_show_injection_info(FAULT_KMALLOC);
                 return NULL;
         }
-#endif
+
         return kmalloc(size, flags);
 }
 
@@ -2634,12 +2635,11 @@ static inline void *f2fs_kzalloc(struct f2fs_sb_info *sbi,
 static inline void *f2fs_kvmalloc(struct f2fs_sb_info *sbi,
                                         size_t size, gfp_t flags)
 {
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_KVMALLOC)) {
                 f2fs_show_injection_info(FAULT_KVMALLOC);
                 return NULL;
         }
-#endif
+
         return kvmalloc(size, flags);
 }
 
diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 8c4694b9af27..1f76cc3fc46b 100644
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -668,12 +668,11 @@ int f2fs_truncate(struct inode *inode)
 
         trace_f2fs_truncate(inode);
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(F2FS_I_SB(inode), FAULT_TRUNCATE)) {
                 f2fs_show_injection_info(FAULT_TRUNCATE);
                 return -EIO;
         }
-#endif
+
         /* we should check inline_data size */
         if (!f2fs_may_inline_data(inode)) {
                 err = f2fs_convert_inline_inode(inode);
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index e352fbd33848..76a22b3773bc 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -53,12 +53,10 @@ static int gc_thread_func(void *data)
                         continue;
                 }
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
                 if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
                         f2fs_show_injection_info(FAULT_CHECKPOINT);
                         f2fs_stop_checkpoint(sbi, false);
                 }
-#endif
 
                 if (!sb_start_write_trylock(sbi->sb))
                         continue;
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index fc2c98b9e255..6908896a1950 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -659,12 +659,11 @@ retry:
         if (F2FS_HAS_BLOCKS(inode))
                 err = f2fs_truncate(inode);
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_EVICT_INODE)) {
                 f2fs_show_injection_info(FAULT_EVICT_INODE);
                 err = -EIO;
         }
-#endif
+
         if (!err) {
                 f2fs_lock_op(sbi);
                 err = f2fs_remove_inode_page(inode);
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 472dd643b074..dd2e45a661aa 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2323,12 +2323,11 @@ bool f2fs_alloc_nid(struct f2fs_sb_info *sbi, nid_t *nid)
         struct f2fs_nm_info *nm_i = NM_I(sbi);
         struct free_nid *i = NULL;
 retry:
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_ALLOC_NID)) {
                 f2fs_show_injection_info(FAULT_ALLOC_NID);
                 return false;
         }
-#endif
+
         spin_lock(&nm_i->nid_list_lock);
 
         if (unlikely(nm_i->available_nids == 0)) {
diff --git a/fs/f2fs/recovery.c b/fs/f2fs/recovery.c
index 64e5a59a270a..95511ed11a22 100644
--- a/fs/f2fs/recovery.c
+++ b/fs/f2fs/recovery.c
@@ -518,10 +518,9 @@ retry_dn:
 
                         if (src == NULL_ADDR) {
                                 err = f2fs_reserve_new_block(&dn);
-#ifdef CONFIG_F2FS_FAULT_INJECTION
-                                while (err)
+                                while (err &&
+                                       IS_ENABLED(CONFIG_F2FS_FAULT_INJECTION))
                                         err = f2fs_reserve_new_block(&dn);
-#endif
                                 /* We should not get -ENOSPC */
                                 f2fs_bug_on(sbi, err);
                                 if (err)
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index 63fc647f9ac2..b136e39e1e9e 100644
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -470,12 +470,10 @@ int f2fs_commit_inmem_pages(struct inode *inode)
  */
 void f2fs_balance_fs(struct f2fs_sb_info *sbi, bool need)
 {
-#ifdef CONFIG_F2FS_FAULT_INJECTION
         if (time_to_inject(sbi, FAULT_CHECKPOINT)) {
                 f2fs_show_injection_info(FAULT_CHECKPOINT);
                 f2fs_stop_checkpoint(sbi, false);
         }
-#endif
 
         /* balance_fs_bg is able to be pending */
         if (need && excess_cached_nats(sbi))
@@ -1041,13 +1039,11 @@ static int __submit_discard_cmd(struct f2fs_sb_info *sbi,
 
                 dc->len += len;
 
-#ifdef CONFIG_F2FS_FAULT_INJECTION
                 if (time_to_inject(sbi, FAULT_DISCARD)) {
                         f2fs_show_injection_info(FAULT_DISCARD);
                         err = -EIO;
                         goto submit;
                 }
-#endif
                 err = __blkdev_issue_discard(bdev,
                                         SECTOR_FROM_BLOCK(start),
                                         SECTOR_FROM_BLOCK(len),