This patch fixes to handle EIO during recover_orphan_inode() given the below
panic.

F2FS-fs : inject IO error in f2fs_read_end_io+0xe6/0x100 [f2fs]
------------[ cut here ]------------
RIP: 0010:[<ffffffffc0b244e3>]  [<ffffffffc0b244e3>] 
f2fs_evict_inode+0x433/0x470 [f2fs]
RSP: 0018:ffff92f8b7fb7c30  EFLAGS: 00010246
RAX: ffff92fb88a13500 RBX: ffff92f890566ea0 RCX: 00000000fd3c255c
RDX: 0000000000000001 RSI: ffff92fb88a13d90 RDI: ffff92fb8ee127e8
RBP: ffff92f8b7fb7c58 R08: 0000000000000001 R09: ffff92fb88a13d58
R10: 000000005a6a9373 R11: 0000000000000001 R12: 00000000fffffffb
R13: ffff92fb8ee12000 R14: 00000000000034ca R15: ffff92fb8ee12620
FS:  00007f1fefd8e880(0000) GS:ffff92fb95600000(0000) knlGS:0000000000000000
CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 00007fc211d34cdb CR3: 000000012d43a000 CR4: 00000000001406e0
Stack:
 ffff92f890566ea0 ffff92f890567078 ffffffffc0b5a0c0 ffff92f890566f28
 ffff92fb888b2000 ffff92f8b7fb7c80 ffffffffbc27ff55 ffff92f890566ea0
 ffff92fb8bf10000 ffffffffc0b5a0c0 ffff92f8b7fb7cb0 ffffffffbc28090d
Call Trace:
 [<ffffffffbc27ff55>] evict+0xc5/0x1a0
 [<ffffffffbc28090d>] iput+0x1ad/0x2c0
 [<ffffffffc0b3304c>] recover_orphan_inodes+0x10c/0x2e0 [f2fs]
 [<ffffffffc0b2e0f4>] f2fs_fill_super+0x884/0x1150 [f2fs]
 [<ffffffffbc2644ac>] mount_bdev+0x18c/0x1c0
 [<ffffffffc0b2d870>] ? f2fs_commit_super+0x100/0x100 [f2fs]
 [<ffffffffc0b2a755>] f2fs_mount+0x15/0x20 [f2fs]
 [<ffffffffbc264e49>] mount_fs+0x39/0x170
 [<ffffffffbc28555b>] vfs_kern_mount+0x6b/0x160
 [<ffffffffbc2881df>] do_mount+0x1cf/0xd00
 [<ffffffffbc287f2c>] ? copy_mount_options+0xac/0x170
 [<ffffffffbc289003>] SyS_mount+0x83/0xd0
 [<ffffffffbc8ee880>] entry_SYSCALL_64_fastpath+0x23/0xc1

Signed-off-by: Jaegeuk Kim <jaeg...@kernel.org>
---
 fs/f2fs/checkpoint.c | 27 +++++++++++++++++----------
 fs/f2fs/super.c      |  1 +
 2 files changed, 18 insertions(+), 10 deletions(-)

diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index cd9fd7b..d1560bb 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -535,6 +535,17 @@ static int recover_orphan_inode(struct f2fs_sb_info *sbi, 
nid_t ino)
 {
        struct inode *inode;
        struct node_info ni;
+       int err = acquire_orphan_inode(sbi);
+
+       if (err) {
+               set_sbi_flag(sbi, SBI_NEED_FSCK);
+               f2fs_msg(sbi->sb, KERN_WARNING,
+                               "%s: orphan failed (ino=%x), run fsck to fix.",
+                               __func__, ino);
+               return err;
+       }
+
+       __add_ino_entry(sbi, ino, ORPHAN_INO);
 
        inode = f2fs_iget_retry(sbi->sb, ino);
        if (IS_ERR(inode)) {
@@ -555,17 +566,13 @@ static int recover_orphan_inode(struct f2fs_sb_info *sbi, 
nid_t ino)
 
        /* ENOMEM was fully retried in f2fs_evict_inode. */
        if (ni.blk_addr != NULL_ADDR) {
-               int err = acquire_orphan_inode(sbi);
-
-               if (err) {
-                       set_sbi_flag(sbi, SBI_NEED_FSCK);
-                       f2fs_msg(sbi->sb, KERN_WARNING,
-                               "%s: orphan failed (ino=%x), run fsck to fix.",
-                                       __func__, ino);
-                       return err;
-               }
-               __add_ino_entry(sbi, ino, ORPHAN_INO);
+               set_sbi_flag(sbi, SBI_NEED_FSCK);
+               f2fs_msg(sbi->sb, KERN_WARNING,
+                       "%s: orphan failed (ino=%x), run fsck to fix.",
+                               __func__, ino);
+               return -EIO;
        }
+       __remove_ino_entry(sbi, ino, ORPHAN_INO);
        return 0;
 }
 
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 95986a9..e7bb153 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -1893,6 +1893,7 @@ free_root_inode:
        sb->s_root = NULL;
 free_node_inode:
        mutex_lock(&sbi->umount_mutex);
+       release_ino_entry(sbi, true);
        f2fs_leave_shrinker(sbi);
        iput(sbi->node_inode);
        mutex_unlock(&sbi->umount_mutex);
-- 
2.8.3


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