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Date: Wed, 18 Mar 2015 11:18:20 -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 1/2] 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@...nel.org>
---
fs/f2fs/data.c | 2 ++
fs/f2fs/f2fs.h | 6 ++++++
fs/f2fs/file.c | 6 ++++++
fs/f2fs/inode.c | 10 ++++++++++
4 files changed, 24 insertions(+)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index f0a18a0..486113d 100644
--- 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 f2909c6..fec8acc 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -1223,6 +1223,7 @@ 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 */
};
@@ -1331,6 +1332,11 @@ 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 d927f8e..d17ac60 100644
--- 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
--- 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);
--
2.1.1
--
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