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authorChangman Lee <cm224.lee@samsung.com>2013-01-29 18:30:07 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-02-12 07:15:00 +0900
commitd6212a5f18c8f9f9cc884070a96e11907711217f (patch)
treed1c579ecdeb7c2ffc94bffbe0b51af4d2e3c49f3 /fs/f2fs
parenta2617dc6863b21a8109c199ab533b3dbfe178f27 (diff)
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f2fs: add un/freeze_fs into super_operations
This patch supports ioctl FIFREEZE and FITHAW to snapshot filesystem. Before calling f2fs_freeze, all writers would be suspended and sync_fs would be completed. So no f2fs has to do something. Just background gc operation should be skipped due to generate dirty nodes and data until unfreeze. Signed-off-by: Changman Lee <cm224.lee@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs')
-rw-r--r--fs/f2fs/gc.c5
-rw-r--r--fs/f2fs/inode.c2
-rw-r--r--fs/f2fs/super.c18
3 files changed, 25 insertions, 0 deletions
diff --git a/fs/f2fs/gc.c b/fs/f2fs/gc.c
index c386910dacc5..9b5d0aad5daf 100644
--- a/fs/f2fs/gc.c
+++ b/fs/f2fs/gc.c
@@ -44,6 +44,11 @@ static int gc_thread_func(void *data)
if (kthread_should_stop())
break;
+ if (sbi->sb->s_writers.frozen >= SB_FREEZE_WRITE) {
+ wait_ms = GC_THREAD_MAX_SLEEP_TIME;
+ continue;
+ }
+
f2fs_balance_fs(sbi);
if (!test_opt(sbi, BG_GC))
diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 340a21be5a76..62433c63e2db 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -278,6 +278,7 @@ void f2fs_evict_inode(struct inode *inode)
if (inode->i_nlink || is_bad_inode(inode))
goto no_delete;
+ sb_start_intwrite(inode->i_sb);
set_inode_flag(F2FS_I(inode), FI_NO_ALLOC);
i_size_write(inode, 0);
@@ -285,6 +286,7 @@ void f2fs_evict_inode(struct inode *inode)
f2fs_truncate(inode);
remove_inode_page(inode);
+ sb_end_intwrite(inode->i_sb);
no_delete:
clear_inode(inode);
}
diff --git a/fs/f2fs/super.c b/fs/f2fs/super.c
index 25656b6869a4..0b18aee2ed25 100644
--- a/fs/f2fs/super.c
+++ b/fs/f2fs/super.c
@@ -143,6 +143,22 @@ int f2fs_sync_fs(struct super_block *sb, int sync)
return 0;
}
+static int f2fs_freeze(struct super_block *sb)
+{
+ int err;
+
+ if (sb->s_flags & MS_RDONLY)
+ return 0;
+
+ err = f2fs_sync_fs(sb, 1);
+ return err;
+}
+
+static int f2fs_unfreeze(struct super_block *sb)
+{
+ return 0;
+}
+
static int f2fs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
struct super_block *sb = dentry->d_sb;
@@ -213,6 +229,8 @@ static struct super_operations f2fs_sops = {
.evict_inode = f2fs_evict_inode,
.put_super = f2fs_put_super,
.sync_fs = f2fs_sync_fs,
+ .freeze_fs = f2fs_freeze,
+ .unfreeze_fs = f2fs_unfreeze,
.statfs = f2fs_statfs,
};