f2fs: avoid punch_hole overhead when releasing volatile data

This patch is to avoid some punch_hole overhead when releasing volatile data.
If volatile data was not written yet, we just can make the first page as zero.

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

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index f0a18a0..486113d 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1291,6 +1291,8 @@ int do_write_data_page(struct page *page, struct f2fs_io_info *fio)
                write_data_page(page, &dn, fio);
                f2fs_update_extent_cache(&dn);
                set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
+               if (page->index == 0)
+                       set_inode_flag(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
        }
 out_writepage:
        f2fs_put_dnode(&dn);

diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index dbe1144..9e37817 100644 (file)
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1232,6 +1232,7 @@ enum {
        FI_NEED_IPU,            /* used for ipu per file */
        FI_ATOMIC_FILE,         /* indicate atomic file */
        FI_VOLATILE_FILE,       /* indicate volatile file */
+       FI_FIRST_BLOCK_WRITTEN, /* indicate #0 data block was written */
        FI_DROP_CACHE,          /* drop dirty page cache */
        FI_DATA_EXIST,          /* indicate data exists */
 };
@@ -1340,6 +1341,11 @@ static inline bool f2fs_is_volatile_file(struct inode *inode)
        return is_inode_flag_set(F2FS_I(inode), FI_VOLATILE_FILE);
 }
 
+static inline bool f2fs_is_first_block_written(struct inode *inode)
+{
+       return is_inode_flag_set(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
+}
+
 static inline bool f2fs_is_drop_cache(struct inode *inode)
 {
        return is_inode_flag_set(F2FS_I(inode), FI_DROP_CACHE);

diff --git a/fs/f2fs/file.c b/fs/f2fs/file.c
index 36dc758..39a07a5 100644 (file)
--- a/fs/f2fs/file.c
+++ b/fs/f2fs/file.c
@@ -437,6 +437,9 @@ int truncate_data_blocks_range(struct dnode_of_data *dn, int count)
                dn->data_blkaddr = NULL_ADDR;
                f2fs_update_extent_cache(dn);
                invalidate_blocks(sbi, blkaddr);
+               if (dn->ofs_in_node == 0 && IS_INODE(dn->node_page))
+                       clear_inode_flag(F2FS_I(dn->inode),
+                                               FI_FIRST_BLOCK_WRITTEN);
                nr_free++;
        }
        if (nr_free) {
@@ -1005,6 +1008,9 @@ static int f2fs_ioc_release_volatile_write(struct file *filp)
        if (!f2fs_is_volatile_file(inode))
                return 0;
 
+       if (!f2fs_is_first_block_written(inode))
+               return truncate_partial_data_page(inode, 0, true);
+
        punch_hole(inode, 0, F2FS_BLKSIZE);
        return 0;
 }

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index b508744..bb58009 100644 (file)
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -51,6 +51,13 @@ static void __get_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
        }
 }
 
+static bool __written_first_block(struct f2fs_inode *ri)
+{
+       if (ri->i_addr[0] != NEW_ADDR && ri->i_addr[0] != NULL_ADDR)
+               return true;
+       return false;
+}
+
 static void __set_inode_rdev(struct inode *inode, struct f2fs_inode *ri)
 {
        if (S_ISCHR(inode->i_mode) || S_ISBLK(inode->i_mode)) {
@@ -143,6 +150,9 @@ static int do_read_inode(struct inode *inode)
        /* get rdev by using inline_info */
        __get_inode_rdev(inode, ri);
 
+       if (__written_first_block(ri))
+               set_inode_flag(F2FS_I(inode), FI_FIRST_BLOCK_WRITTEN);
+
        f2fs_put_page(node_page, 1);
 
        stat_inc_inline_inode(inode);