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ext4: remove code duplication in ext4_get_block_write_nolock()

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729f52c6be introduced function ext4_get_block_write_nolock() that
is very similar to _ext4_get_block(). Eliminate code duplication
by passing different flags to _ext4_get_block()

Tested: xfs tests

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Anatol Pomozov <anatol.pomozov@gmail.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Anatol Pomozov 2012-11-08 15:07:16 -05:00 committed by Theodore Ts'o
parent 8d8c182570
commit 8b0f165f79
1 changed files with 24 additions and 39 deletions
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63
fs/ext4/inode.c
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@ -683,7 +683,7 @@ static int _ext4_get_block(struct inode *inode, sector_t iblock,
map.m_lblk = iblock;
map.m_len = bh->b_size >> inode->i_blkbits;
if (flags && !handle) {
if (flags && !(flags & EXT4_GET_BLOCKS_NO_LOCK) && !handle) {
/* Direct IO write... */
if (map.m_len > DIO_MAX_BLOCKS)
map.m_len = DIO_MAX_BLOCKS;
@ -880,6 +880,8 @@ static int do_journal_get_write_access(handle_t *handle,
static int ext4_get_block_write(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int create);
static int ext4_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned flags,
struct page **pagep, void **fsdata)
@ -2850,29 +2852,12 @@ static int ext4_get_block_write(struct inode *inode, sector_t iblock,
}
static int ext4_get_block_write_nolock(struct inode *inode, sector_t iblock,
struct buffer_head *bh_result, int flags)
struct buffer_head *bh_result, int create)
{
handle_t *handle = ext4_journal_current_handle();
struct ext4_map_blocks map;
int ret = 0;
ext4_debug("ext4_get_block_write_nolock: inode %lu, flag %d\n",
inode->i_ino, flags);
flags = EXT4_GET_BLOCKS_NO_LOCK;
map.m_lblk = iblock;
map.m_len = bh_result->b_size >> inode->i_blkbits;
ret = ext4_map_blocks(handle, inode, &map, flags);
if (ret > 0) {
map_bh(bh_result, inode->i_sb, map.m_pblk);
bh_result->b_state = (bh_result->b_state & ~EXT4_MAP_FLAGS) |
map.m_flags;
bh_result->b_size = inode->i_sb->s_blocksize * map.m_len;
ret = 0;
}
return ret;
ext4_debug("ext4_get_block_write_nolock: inode %lu, create flag %d\n",
inode->i_ino, create);
return _ext4_get_block(inode, iblock, bh_result,
EXT4_GET_BLOCKS_NO_LOCK);
}
static void ext4_end_io_dio(struct kiocb *iocb, loff_t offset,
@ -3003,6 +2988,8 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
loff_t final_size = offset + count;
if (rw == WRITE && final_size <= inode->i_size) {
int overwrite = 0;
get_block_t *get_block_func = NULL;
int dio_flags = 0;
BUG_ON(iocb->private == NULL);
@ -3056,22 +3043,20 @@ static ssize_t ext4_ext_direct_IO(int rw, struct kiocb *iocb,
ext4_inode_aio_set(inode, io_end);
}
if (overwrite)
ret = __blockdev_direct_IO(rw, iocb, inode,
inode->i_sb->s_bdev, iov,
offset, nr_segs,
ext4_get_block_write_nolock,
ext4_end_io_dio,
NULL,
0);
else
ret = __blockdev_direct_IO(rw, iocb, inode,
inode->i_sb->s_bdev, iov,
offset, nr_segs,
ext4_get_block_write,
ext4_end_io_dio,
NULL,
DIO_LOCKING);
if (overwrite) {
get_block_func = ext4_get_block_write_nolock;
} else {
get_block_func = ext4_get_block_write;
dio_flags = DIO_LOCKING;
}
ret = __blockdev_direct_IO(rw, iocb, inode,
inode->i_sb->s_bdev, iov,
offset, nr_segs,
get_block_func,
ext4_end_io_dio,
NULL,
dio_flags);
if (iocb->private)
ext4_inode_aio_set(inode, NULL);
/*