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f2fs: introduce universal lookup/update interface for extent cache

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In this patch, we do these jobs:
1. rename {check,update}_extent_cache to {lookup,update}_extent_info;
2. introduce universal lookup/update interface of extent cache:
f2fs_{lookup,update}_extent_cache including above two real functions, then
export them to function callers.

So after above cleanup, we can add new rb-tree based extent cache into exported
interfaces.

v2:
 o remove "f2fs_" for inner function {lookup,update}_extent_info suggested by
   Jaegeuk Kim.

Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Chao Yu
2015-02-05 17:51:34 +08:00
committed by Jaegeuk Kim
parent a2e7d1bfeb
commit 7e4dde79df
5 changed files with 44 additions and 30 deletions
Download Patch File Download Diff File Expand all files Collapse all files

66
fs/f2fs/data.c
View File

@@ -263,20 +263,20 @@ static void f2fs_map_bh(struct super_block *sb, pgoff_t pgofs,
bh_result->b_size = UINT_MAX;
}
static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
struct extent_info *ei)
static bool lookup_extent_info(struct inode *inode, pgoff_t pgofs,
struct extent_info *ei)
{
struct f2fs_inode_info *fi = F2FS_I(inode);
pgoff_t start_fofs, end_fofs;
block_t start_blkaddr;
if (is_inode_flag_set(fi, FI_NO_EXTENT))
return 0;
return false;
read_lock(&fi->ext_lock);
if (fi->ext.len == 0) {
read_unlock(&fi->ext_lock);
return 0;
return false;
}
stat_inc_total_hit(inode->i_sb);
@@ -289,29 +289,22 @@ static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
*ei = fi->ext;
stat_inc_read_hit(inode->i_sb);
read_unlock(&fi->ext_lock);
return 1;
return true;
}
read_unlock(&fi->ext_lock);
return 0;
return false;
}
void update_extent_cache(struct dnode_of_data *dn)
static bool update_extent_info(struct inode *inode, pgoff_t fofs,
block_t blkaddr)
{
struct f2fs_inode_info *fi = F2FS_I(dn->inode);
pgoff_t fofs, start_fofs, end_fofs;
struct f2fs_inode_info *fi = F2FS_I(inode);
pgoff_t start_fofs, end_fofs;
block_t start_blkaddr, end_blkaddr;
int need_update = true;
f2fs_bug_on(F2FS_I_SB(dn->inode), dn->data_blkaddr == NEW_ADDR);
/* Update the page address in the parent node */
__set_data_blkaddr(dn);
if (is_inode_flag_set(fi, FI_NO_EXTENT))
return;
fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
dn->ofs_in_node;
return false;
write_lock(&fi->ext_lock);
@@ -326,16 +319,16 @@ void update_extent_cache(struct dnode_of_data *dn)
/* Initial extent */
if (fi->ext.len == 0) {
if (dn->data_blkaddr != NULL_ADDR) {
if (blkaddr != NULL_ADDR) {
fi->ext.fofs = fofs;
fi->ext.blk = dn->data_blkaddr;
fi->ext.blk = blkaddr;
fi->ext.len = 1;
}
goto end_update;
}
/* Front merge */
if (fofs == start_fofs - 1 && dn->data_blkaddr == start_blkaddr - 1) {
if (fofs == start_fofs - 1 && blkaddr == start_blkaddr - 1) {
fi->ext.fofs--;
fi->ext.blk--;
fi->ext.len++;
@@ -343,7 +336,7 @@ void update_extent_cache(struct dnode_of_data *dn)
}
/* Back merge */
if (fofs == end_fofs + 1 && dn->data_blkaddr == end_blkaddr + 1) {
if (fofs == end_fofs + 1 && blkaddr == end_blkaddr + 1) {
fi->ext.len++;
goto end_update;
}
@@ -370,9 +363,30 @@ void update_extent_cache(struct dnode_of_data *dn)
}
end_update:
write_unlock(&fi->ext_lock);
if (need_update)
return need_update;
}
static bool f2fs_lookup_extent_cache(struct inode *inode, pgoff_t pgofs,
struct extent_info *ei)
{
return lookup_extent_info(inode, pgofs, ei);
}
void f2fs_update_extent_cache(struct dnode_of_data *dn)
{
struct f2fs_inode_info *fi = F2FS_I(dn->inode);
pgoff_t fofs;
f2fs_bug_on(F2FS_I_SB(dn->inode), dn->data_blkaddr == NEW_ADDR);
/* Update the page address in the parent node */
__set_data_blkaddr(dn);
fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
dn->ofs_in_node;
if (update_extent_info(dn->inode, fofs, dn->data_blkaddr))
sync_inode_page(dn);
return;
}
struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
@@ -668,7 +682,7 @@ static int __get_data_block(struct inode *inode, sector_t iblock,
/* Get the page offset from the block offset(iblock) */
pgofs = (pgoff_t)(iblock >> (PAGE_CACHE_SHIFT - blkbits));
if (check_extent_cache(inode, pgofs, &ei)) {
if (f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
f2fs_map_bh(inode->i_sb, pgofs, &ei, bh_result);
goto out;
}
@@ -835,7 +849,7 @@ int do_write_data_page(struct page *page, struct f2fs_io_info *fio)
set_inode_flag(F2FS_I(inode), FI_UPDATE_WRITE);
} else {
write_data_page(page, &dn, fio);
update_extent_cache(&dn);
f2fs_update_extent_cache(&dn);
set_inode_flag(F2FS_I(inode), FI_APPEND_WRITE);
}
out_writepage: