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f2fs: introduce prepare_write_begin to clean up 

This patch adds prepare_write_begin to clean f2fs_write_begin.
The major role of this function is to convert any inline_data and allocate
or find block address.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2015-12-23 11:55:18 -08:00
parent fba48a8b14
commit 2aadac085c
1 changed files with 54 additions and 38 deletions
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92
fs/f2fs/data.c
View File

@ -1410,6 +1410,51 @@ static void f2fs_write_failed(struct address_space *mapping, loff_t to)
}
}
static int prepare_write_begin(struct f2fs_sb_info *sbi,
struct page *page, loff_t pos, unsigned len,
block_t *blk_addr, bool *node_changed)
{
struct inode *inode = page->mapping->host;
pgoff_t index = page->index;
struct dnode_of_data dn;
struct page *ipage;
int err = 0;
f2fs_lock_op(sbi);
/* check inline_data */
ipage = get_node_page(sbi, inode->i_ino);
if (IS_ERR(ipage)) {
err = PTR_ERR(ipage);
goto unlock_out;
}
set_new_dnode(&dn, inode, ipage, ipage, 0);
if (f2fs_has_inline_data(inode)) {
if (pos + len <= MAX_INLINE_DATA) {
read_inline_data(page, ipage);
set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
sync_inode_page(&dn);
goto done;
} else {
err = f2fs_convert_inline_page(&dn, page);
if (err)
goto err_out;
}
}
err = f2fs_get_block(&dn, index);
done:
/* convert_inline_page can make node_changed */
*blk_addr = dn.data_blkaddr;
*node_changed = dn.node_changed;
err_out:
f2fs_put_dnode(&dn);
unlock_out:
f2fs_unlock_op(sbi);
return err;
}
static int f2fs_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
@ -1417,9 +1462,9 @@ static int f2fs_write_begin(struct file *file, struct address_space *mapping,
struct inode *inode = mapping->host;
struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
struct page *page = NULL;
struct page *ipage;
pgoff_t index = ((unsigned long long) pos) >> PAGE_CACHE_SHIFT;
struct dnode_of_data dn;
bool need_balance = false;
block_t blkaddr = NULL_ADDR;
int err = 0;
trace_f2fs_write_begin(inode, pos, len, flags);
@ -1443,37 +1488,12 @@ repeat:
*pagep = page;
f2fs_lock_op(sbi);
/* check inline_data */
ipage = get_node_page(sbi, inode->i_ino);
if (IS_ERR(ipage)) {
err = PTR_ERR(ipage);
goto unlock_fail;
}
set_new_dnode(&dn, inode, ipage, ipage, 0);
if (f2fs_has_inline_data(inode)) {
if (pos + len <= MAX_INLINE_DATA) {
read_inline_data(page, ipage);
set_inode_flag(F2FS_I(inode), FI_DATA_EXIST);
sync_inode_page(&dn);
goto put_next;
}
err = f2fs_convert_inline_page(&dn, page);
if (err)
goto put_fail;
}
err = f2fs_get_block(&dn, index);
err = prepare_write_begin(sbi, page, pos, len,
&blkaddr, &need_balance);
if (err)
goto put_fail;
put_next:
f2fs_put_dnode(&dn);
f2fs_unlock_op(sbi);
goto fail;
if (dn.node_changed && has_not_enough_free_secs(sbi, 0)) {
if (need_balance && has_not_enough_free_secs(sbi, 0)) {
unlock_page(page);
f2fs_balance_fs(sbi);
lock_page(page);
@ -1488,7 +1508,7 @@ put_next:
/* wait for GCed encrypted page writeback */
if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode))
f2fs_wait_on_encrypted_page_writeback(sbi, dn.data_blkaddr);
f2fs_wait_on_encrypted_page_writeback(sbi, blkaddr);
if (len == PAGE_CACHE_SIZE)
goto out_update;
@ -1504,14 +1524,14 @@ put_next:
goto out_update;
}
if (dn.data_blkaddr == NEW_ADDR) {
if (blkaddr == NEW_ADDR) {
zero_user_segment(page, 0, PAGE_CACHE_SIZE);
} else {
struct f2fs_io_info fio = {
.sbi = sbi,
.type = DATA,
.rw = READ_SYNC,
.blk_addr = dn.data_blkaddr,
.blk_addr = blkaddr,
.page = page,
.encrypted_page = NULL,
};
@ -1542,10 +1562,6 @@ out_clear:
clear_cold_data(page);
return 0;
put_fail:
f2fs_put_dnode(&dn);
unlock_fail:
f2fs_unlock_op(sbi);
fail:
f2fs_put_page(page, 1);
f2fs_write_failed(mapping, pos + len);