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Date: Tue, 12 Aug 2014 12:49:27 -0700
From: Jaegeuk Kim <jaegeuk@...nel.org>
To: linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
linux-f2fs-devel@...ts.sourceforge.net
Cc: Jaegeuk Kim <jaegeuk@...nel.org>
Subject: [PATCH 13/13] f2fs: handle EIO not to break fs consistency
There are two rules when EIO is occurred.
1. don't write any checkpoint data to preserve the previous checkpoint
2. don't lose the cached data/node/meta pages
So, at first, this patch adds set_page_dirty in f2fs_write_end_io's failure.
Then, writing checkpoint/dentry/node blocks is not allowed.
Signed-off-by: Jaegeuk Kim <jaegeuk@...nel.org>
---
fs/f2fs/checkpoint.c | 47 +++++++++++++++++++++++++++++++++--------------
fs/f2fs/data.c | 10 +++++++++-
fs/f2fs/f2fs.h | 1 +
fs/f2fs/node.c | 2 ++
fs/f2fs/super.c | 3 +++
5 files changed, 48 insertions(+), 15 deletions(-)
diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c
index d074e27..b365c64 100644
--- a/fs/f2fs/checkpoint.c
+++ b/fs/f2fs/checkpoint.c
@@ -160,14 +160,11 @@ static int f2fs_write_meta_page(struct page *page,
goto redirty_out;
if (wbc->for_reclaim)
goto redirty_out;
-
- /* Should not write any meta pages, if any IO error was occurred */
if (unlikely(f2fs_cp_error(sbi)))
- goto no_write;
+ goto redirty_out;
f2fs_wait_on_page_writeback(page, META);
write_meta_page(sbi, page);
-no_write:
dec_page_count(sbi, F2FS_DIRTY_META);
unlock_page(page);
return 0;
@@ -348,7 +345,7 @@ bool exist_written_data(struct f2fs_sb_info *sbi, nid_t ino, int mode)
return e ? true : false;
}
-static void release_dirty_inode(struct f2fs_sb_info *sbi)
+void release_dirty_inode(struct f2fs_sb_info *sbi)
{
struct ino_entry *e, *tmp;
int i;
@@ -737,7 +734,7 @@ retry:
/*
* Freeze all the FS-operations for checkpoint.
*/
-static void block_operations(struct f2fs_sb_info *sbi)
+static int block_operations(struct f2fs_sb_info *sbi)
{
struct writeback_control wbc = {
.sync_mode = WB_SYNC_ALL,
@@ -745,6 +742,7 @@ static void block_operations(struct f2fs_sb_info *sbi)
.for_reclaim = 0,
};
struct blk_plug plug;
+ int err = 0;
blk_start_plug(&plug);
@@ -754,6 +752,10 @@ retry_flush_dents:
if (get_pages(sbi, F2FS_DIRTY_DENTS)) {
f2fs_unlock_all(sbi);
sync_dirty_dir_inodes(sbi);
+ if (unlikely(f2fs_cp_error(sbi))) {
+ err = -EIO;
+ goto out;
+ }
goto retry_flush_dents;
}
@@ -767,9 +769,16 @@ retry_flush_nodes:
if (get_pages(sbi, F2FS_DIRTY_NODES)) {
up_write(&sbi->node_write);
sync_node_pages(sbi, 0, &wbc);
+ if (unlikely(f2fs_cp_error(sbi))) {
+ f2fs_unlock_all(sbi);
+ err = -EIO;
+ goto out;
+ }
goto retry_flush_nodes;
}
+out:
blk_finish_plug(&plug);
+ return err;
}
static void unblock_operations(struct f2fs_sb_info *sbi)
@@ -813,8 +822,11 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
discard_next_dnode(sbi, NEXT_FREE_BLKADDR(sbi, curseg));
/* Flush all the NAT/SIT pages */
- while (get_pages(sbi, F2FS_DIRTY_META))
+ while (get_pages(sbi, F2FS_DIRTY_META)) {
sync_meta_pages(sbi, META, LONG_MAX);
+ if (unlikely(f2fs_cp_error(sbi)))
+ return;
+ }
next_free_nid(sbi, &last_nid);
@@ -931,14 +943,19 @@ static void do_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
sbi->last_valid_block_count = sbi->total_valid_block_count;
sbi->alloc_valid_block_count = 0;
+ if (unlikely(f2fs_cp_error(sbi)))
+ return;
+
/* Here, we only have one bio having CP pack */
sync_meta_pages(sbi, META_FLUSH, LONG_MAX);
- if (!f2fs_cp_error(sbi)) {
- clear_prefree_segments(sbi);
- release_dirty_inode(sbi);
- F2FS_RESET_SB_DIRT(sbi);
- }
+ release_dirty_inode(sbi);
+
+ if (unlikely(f2fs_cp_error(sbi)))
+ return;
+
+ clear_prefree_segments(sbi);
+ F2FS_RESET_SB_DIRT(sbi);
}
/*
@@ -955,8 +972,10 @@ void write_checkpoint(struct f2fs_sb_info *sbi, bool is_umount)
if (!sbi->s_dirty)
goto out;
-
- block_operations(sbi);
+ if (unlikely(f2fs_cp_error(sbi)))
+ goto out;
+ if (block_operations(sbi))
+ goto out;
trace_f2fs_write_checkpoint(sbi->sb, is_umount, "finish block_ops");
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index ac3ccc2..68834e2 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -53,7 +53,7 @@ static void f2fs_write_end_io(struct bio *bio, int err)
struct page *page = bvec->bv_page;
if (unlikely(err)) {
- SetPageError(page);
+ set_page_dirty(page);
set_bit(AS_EIO, &page->mapping->flags);
f2fs_stop_checkpoint(sbi);
}
@@ -836,10 +836,18 @@ write:
/* Dentry blocks are controlled by checkpoint */
if (S_ISDIR(inode->i_mode)) {
+ if (unlikely(f2fs_cp_error(sbi)))
+ goto redirty_out;
err = do_write_data_page(page, &fio);
goto done;
}
+ if (unlikely(f2fs_cp_error(sbi))) {
+ SetPageError(page);
+ unlock_page(page);
+ return 0;
+ }
+
if (!wbc->for_reclaim)
need_balance_fs = true;
else if (has_not_enough_free_secs(sbi, 0))
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index 46ceb88..2d009ae 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1267,6 +1267,7 @@ int ra_meta_pages(struct f2fs_sb_info *, int, int, int);
long sync_meta_pages(struct f2fs_sb_info *, enum page_type, long);
void add_dirty_inode(struct f2fs_sb_info *, nid_t, int type);
void remove_dirty_inode(struct f2fs_sb_info *, nid_t, int type);
+void release_dirty_inode(struct f2fs_sb_info *);
bool exist_written_data(struct f2fs_sb_info *, nid_t, int);
int acquire_orphan_inode(struct f2fs_sb_info *);
void release_orphan_inode(struct f2fs_sb_info *);
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 9f126f8..d2f7842 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1215,6 +1215,8 @@ static int f2fs_write_node_page(struct page *page,
if (unlikely(sbi->por_doing))
goto redirty_out;
+ if (unlikely(f2fs_cp_error(sbi)))
+ goto redirty_out;
f2fs_wait_on_page_writeback(page, NODE);
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index c4f90cd..c999d67 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -435,6 +435,9 @@ static void f2fs_put_super(struct super_block *sb)
if (sbi->s_dirty)
write_checkpoint(sbi, true);
+ /* EIO will skip do checkpoint, so here we need to release this */
+ release_dirty_inode(sbi);
+
iput(sbi->node_inode);
iput(sbi->meta_inode);
--
1.8.5.2 (Apple Git-48)
--
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