[PATCH 1/2] f2fs crypto: clean up error handling in f2fs_fname_setup_filename

[PATCH 1/2] f2fs crypto: clean up error handling in f2fs_fname_setup_filename

[Jaegeuk Kim]

Sync with:
  ext4 crypto: clean up error handling in ext4_fname_setup_filename

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/crypto_fname.c | 24 ++++++++++--------------
 1 file changed, 10 insertions(+), 14 deletions(-)

diff --git a/fs/f2fs/crypto_fname.c b/fs/f2fs/crypto_fname.c
index 81852cc..ab377d4 100644
--- a/fs/f2fs/crypto_fname.c
+++ b/fs/f2fs/crypto_fname.c
@@ -392,15 +392,13 @@ int f2fs_fname_setup_filename(struct inode *dir, const struct qstr *iname,
 			return ret;
 		ret = f2fs_fname_encrypt(dir, iname, &fname->crypto_buf);
 		if (ret < 0)
-			goto out;
+			goto errout;
 		fname->disk_name.name = fname->crypto_buf.name;
 		fname->disk_name.len = fname->crypto_buf.len;
 		return 0;
 	}
-	if (!lookup) {
-		ret = -EACCES;
-		goto out;
-	}
+	if (!lookup)
+		return -EACCES;
 
 	/* We don't have the key and we are doing a lookup; decode the
 	 * user-supplied name
@@ -408,19 +406,17 @@ int f2fs_fname_setup_filename(struct inode *dir, const struct qstr *iname,
 	if (iname->name[0] == '_')
 		bigname = 1;
 	if ((bigname && (iname->len != 33)) ||
-	    (!bigname && (iname->len > 43))) {
-		ret = -ENOENT;
-	}
+	    (!bigname && (iname->len > 43)))
+		return -ENOENT;
+
 	fname->crypto_buf.name = kmalloc(32, GFP_KERNEL);
-	if (fname->crypto_buf.name == NULL) {
-		ret = -ENOMEM;
-		goto out;
-	}
+	if (fname->crypto_buf.name == NULL)
+		return -ENOMEM;
 	ret = digest_decode(iname->name + bigname, iname->len - bigname,
 				fname->crypto_buf.name);
 	if (ret < 0) {
 		ret = -ENOENT;
-		goto out;
+		goto errout;
 	}
 	fname->crypto_buf.len = ret;
 	if (bigname) {
@@ -430,7 +426,7 @@ int f2fs_fname_setup_filename(struct inode *dir, const struct qstr *iname,
 		fname->disk_name.len = fname->crypto_buf.len;
 	}
 	return 0;
-out:
+errout:
 	f2fs_fname_crypto_free_buffer(&fname->crypto_buf);
 	return ret;
 }
-- 
2.1.1

[PATCH 2/2] f2fs: fix a deadlock for summary page lock vs. sentry_lock

[Jaegeuk Kim]

In f2fs_gc:                      In f2fs_replace_block:
 - lock_page(sum_page)
  - check_valid_map()            - mutex_lock(sentry_lock)
   - mutex_lock(sentry_lock)     - change_curseg()
                                  - lock_page(sum_page)

This patch fixes the deadlock condition.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
---
 fs/f2fs/gc.c | 11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)

diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index 43354cb..e1e7361 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -750,6 +750,15 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
 
 	sum = page_address(sum_page);
 
+	/*
+	 * this is to avoid deadlock:
+	 * - lock_page(sum_page)         - f2fs_replace_block
+	 *  - check_valid_map()            - mutex_lock(sentry_lock)
+	 *   - mutex_lock(sentry_lock)     - change_curseg()
+	 *                                  - lock_page(sum_page)
+	 */
+	unlock_page(sum_page);
+
 	switch (GET_SUM_TYPE((&sum->footer))) {
 	case SUM_TYPE_NODE:
 		gc_node_segment(sbi, sum->entries, segno, gc_type);
@@ -763,7 +772,7 @@ static void do_garbage_collect(struct f2fs_sb_info *sbi, unsigned int segno,
 	stat_inc_seg_count(sbi, GET_SUM_TYPE((&sum->footer)), gc_type);
 	stat_inc_call_count(sbi->stat_info);
 
-	f2fs_put_page(sum_page, 1);
+	f2fs_put_page(sum_page, 0);
 }
 
 int f2fs_gc(struct f2fs_sb_info *sbi)
-- 
2.1.1