f2fs: introduce FAULT_NO_SEGMENT

Use it to simulate no free segment case during block allocation.

Signed-off-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/Documentation/ABI/testing/sysfs-fs-f2fs b/Documentation/ABI/testing/sysfs-fs-f2fs
index 22d070c..1a4d839 100644 (file)
--- a/Documentation/ABI/testing/sysfs-fs-f2fs
+++ b/Documentation/ABI/testing/sysfs-fs-f2fs
@@ -724,6 +724,7 @@ Description:        Support configuring fault injection type, should be
                FAULT_LOCK_OP                    0x000020000
                FAULT_BLKADDR_VALIDITY           0x000040000
                FAULT_BLKADDR_CONSISTENCE        0x000080000
+               FAULT_NO_SEGMENT                 0x000100000
                ===========================      ===========
 
 What:          /sys/fs/f2fs/<disk>/discard_io_aware_gran

diff --git a/Documentation/filesystems/f2fs.rst b/Documentation/filesystems/f2fs.rst
index 8930d9e..efc3493 100644 (file)
--- a/Documentation/filesystems/f2fs.rst
+++ b/Documentation/filesystems/f2fs.rst
@@ -205,6 +205,7 @@ fault_type=%d                Support configuring fault injection type, should be
                         FAULT_LOCK_OP                    0x000020000
                         FAULT_BLKADDR_VALIDITY           0x000040000
                         FAULT_BLKADDR_CONSISTENCE        0x000080000
+                        FAULT_NO_SEGMENT                 0x000100000
                         ===========================      ===========
 mode=%s                         Control block allocation mode which supports "adaptive"
                         and "lfs". In "lfs" mode, there should be no random

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 4ce48db..f1ec1a5 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -62,6 +62,7 @@ enum {
        FAULT_LOCK_OP,
        FAULT_BLKADDR_VALIDITY,
        FAULT_BLKADDR_CONSISTENCE,
+       FAULT_NO_SEGMENT,
        FAULT_MAX,
 };
 

diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c
index a5339dd..dab9544 100644 (file)
--- a/fs/f2fs/segment.c
+++ b/fs/f2fs/segment.c
@@ -2656,6 +2656,11 @@ static int get_new_segment(struct f2fs_sb_info *sbi,
 
        spin_lock(&free_i->segmap_lock);
 
+       if (time_to_inject(sbi, FAULT_NO_SEGMENT)) {
+               ret = -ENOSPC;
+               goto out_unlock;
+       }
+
        if (!new_sec && ((*newseg + 1) % SEGS_PER_SEC(sbi))) {
                segno = find_next_zero_bit(free_i->free_segmap,
                        GET_SEG_FROM_SEC(sbi, hint + 1), *newseg + 1);

diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 329f317..6190aac 100644 (file)
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -63,6 +63,7 @@ const char *f2fs_fault_name[FAULT_MAX] = {
        [FAULT_LOCK_OP]                 = "lock_op",
        [FAULT_BLKADDR_VALIDITY]        = "invalid blkaddr",
        [FAULT_BLKADDR_CONSISTENCE]     = "inconsistent blkaddr",
+       [FAULT_NO_SEGMENT]              = "no free segment",
 };
 
 void f2fs_build_fault_attr(struct f2fs_sb_info *sbi, unsigned int rate,