Separate the iomap field population code that is currently within
ext4_iomap_begin() into a separate helper ext4_set_iomap(). The intent
of this function is self explanatory, however the rationale behind
taking this step is to reeduce the overall clutter that we currently
have within the ext4_iomap_begin() callback.
Signed-off-by: Matthew Bobrowski <mbobrowski@xxxxxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Reviewed-by: Ritesh Harjani <riteshh@xxxxxxxxxxxxx>
---
fs/ext4/inode.c | 92 +++++++++++++++++++++++++++----------------------
1 file changed, 50 insertions(+), 42 deletions(-)
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index da2ca81e3d9c..073b7c873bb2 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3406,10 +3406,56 @@ static bool ext4_inode_datasync_dirty(struct inode *inode)
return inode->i_state & I_DIRTY_DATASYNC;
}
+static void ext4_set_iomap(struct inode *inode, struct iomap *iomap,
+ struct ext4_map_blocks *map, loff_t offset,
+ loff_t length)
+{
+ u8 blkbits = inode->i_blkbits;
+
+ /*
+ * Writes that span EOF might trigger an I/O size update on completion,
+ * so consider them to be dirty for the purpose of O_DSYNC, even if
+ * there is no other metadata changes being made or are pending.
+ */
+ iomap->flags = 0;
+ if (ext4_inode_datasync_dirty(inode) ||
+ offset + length > i_size_read(inode))
+ iomap->flags |= IOMAP_F_DIRTY;
+
+ if (map->m_flags & EXT4_MAP_NEW)
+ iomap->flags |= IOMAP_F_NEW;
+
+ iomap->bdev = inode->i_sb->s_bdev;
+ iomap->dax_dev = EXT4_SB(inode->i_sb)->s_daxdev;
+ iomap->offset = (u64) map->m_lblk << blkbits;
+ iomap->length = (u64) map->m_len << blkbits;
+
+ if (map->m_flags & (EXT4_MAP_MAPPED | EXT4_MAP_UNWRITTEN)) {
+ /*
+ * Flags passed to ext4_map_blocks() for direct I/O writes can
+ * result in m_flags having both EXT4_MAP_MAPPED and
+ * EXT4_MAP_UNWRITTEN bits set. In order for any allocated
+ * unwritten extents to be converted into written extents
+ * correctly within the ->end_io() handler, we need to ensure
+ * that the iomap->type is set appropriately. Hence, the reason
+ * why we need to check whether the EXT4_MAP_UNWRITTEN bit has
+ * been set first.
+ */
+ if (map->m_flags & EXT4_MAP_UNWRITTEN)
+ iomap->type = IOMAP_UNWRITTEN;
+ else if (map->m_flags & EXT4_MAP_MAPPED)
+ iomap->type = IOMAP_MAPPED;
+
+ iomap->addr = (u64) map->m_pblk << blkbits;
+ } else {
+ iomap->type = IOMAP_HOLE;
+ iomap->addr = IOMAP_NULL_ADDR;
+ }
+}
+
static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
unsigned flags, struct iomap *iomap, struct iomap *srcmap)
{
- struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
unsigned int blkbits = inode->i_blkbits;
unsigned long first_block, last_block;
struct ext4_map_blocks map;
@@ -3523,47 +3569,9 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
return ret;
}
- /*
- * Writes that span EOF might trigger an I/O size update on completion,
- * so consider them to be dirty for the purposes of O_DSYNC, even if
- * there is no other metadata changes being made or are pending here.
- */
- iomap->flags = 0;
- if (ext4_inode_datasync_dirty(inode) ||
- offset + length > i_size_read(inode))
- iomap->flags |= IOMAP_F_DIRTY;
- iomap->bdev = inode->i_sb->s_bdev;
- iomap->dax_dev = sbi->s_daxdev;
- iomap->offset = (u64)first_block << blkbits;
- iomap->length = (u64)map.m_len << blkbits;
-
- if (ret == 0) {
- iomap->type = delalloc ? IOMAP_DELALLOC : IOMAP_HOLE;
- iomap->addr = IOMAP_NULL_ADDR;
- } else {
- /*
- * Flags passed into ext4_map_blocks() for direct I/O writes
- * can result in m_flags having both EXT4_MAP_MAPPED and
- * EXT4_MAP_UNWRITTEN bits set. In order for any allocated
- * unwritten extents to be converted into written extents
- * correctly within the ->end_io() handler, we need to ensure
- * that the iomap->type is set appropriately. Hence the reason
- * why we need to check whether EXT4_MAP_UNWRITTEN is set
- * first.
- */
- if (map.m_flags & EXT4_MAP_UNWRITTEN) {
- iomap->type = IOMAP_UNWRITTEN;
- } else if (map.m_flags & EXT4_MAP_MAPPED) {
- iomap->type = IOMAP_MAPPED;
- } else {
- WARN_ON_ONCE(1);
- return -EIO;
- }
- iomap->addr = (u64)map.m_pblk << blkbits;
- }
-
- if (map.m_flags & EXT4_MAP_NEW)
- iomap->flags |= IOMAP_F_NEW;
+ ext4_set_iomap(inode, iomap, &map, offset, length);
+ if (delalloc && iomap->type == IOMAP_HOLE)
+ iomap->type = IOMAP_DELALLOC;
return 0;
}
--
2.20.1
