On 10/3/19 5:03 PM, Matthew Bobrowski wrote:
As part of ext4_iomap_begin() cleanups and port across direct I/O path
to make use of iomap infrastructure, we split IOMAP_REPORT operations
into a separate ->iomap_begin() handler.
Signed-off-by: Matthew Bobrowski <mbobrowski@xxxxxxxxxxxxxx>
---
fs/ext4/ext4.h | 1 +
fs/ext4/file.c | 6 ++-
fs/ext4/inode.c | 129 ++++++++++++++++++++++++++++--------------------
3 files changed, 80 insertions(+), 56 deletions(-)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 03db3e71676c..d0d88f411a44 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3379,6 +3379,7 @@ static inline void ext4_clear_io_unwritten_flag(ext4_io_end_t *io_end)
}
extern const struct iomap_ops ext4_iomap_ops;
+extern const struct iomap_ops ext4_iomap_report_ops;
static inline int ext4_buffer_uptodate(struct buffer_head *bh)
{
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index 8d2bbcc2d813..ab75aee3e687 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -494,12 +494,14 @@ loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
maxbytes, i_size_read(inode));
case SEEK_HOLE:
inode_lock_shared(inode);
- offset = iomap_seek_hole(inode, offset, &ext4_iomap_ops);
+ offset = iomap_seek_hole(inode, offset,
+ &ext4_iomap_report_ops);
inode_unlock_shared(inode);
break;
case SEEK_DATA:
inode_lock_shared(inode);
- offset = iomap_seek_data(inode, offset, &ext4_iomap_ops);
+ offset = iomap_seek_data(inode, offset,
+ &ext4_iomap_report_ops);
inode_unlock_shared(inode);
break;
}
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index caeb3dec0dec..1dace576b8bd 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -3439,6 +3439,72 @@ static int ext4_set_iomap(struct inode *inode, struct iomap *iomap, u16 type,
return 0;
}
+static u16 ext4_iomap_check_delalloc(struct inode *inode,
+ struct ext4_map_blocks *map)
+{
+ struct extent_status es;
+ ext4_lblk_t end = map->m_lblk + map->m_len - 1;
+
+ ext4_es_find_extent_range(inode, &ext4_es_is_delayed, map->m_lblk,
+ end, &es);
+
+ /* Entire range is a hole */
+ if (!es.es_len || es.es_lblk > end)
+ return IOMAP_HOLE;
+ if (es.es_lblk <= map->m_lblk) {
+ ext4_lblk_t offset = 0;
+
+ if (es.es_lblk < map->m_lblk)
+ offset = map->m_lblk - es.es_lblk;
+ map->m_lblk = es.es_lblk + offset;
This looks redundant no? map->m_lblk never changes actually.
So this is not needed here.
+ map->m_len = es.es_len - offset;
+ return IOMAP_DELALLOC;
+ }
+
+ /* Range starts with a hole */
+ map->m_len = es.es_lblk - map->m_lblk;
+ return IOMAP_HOLE;
+}
+
+static int ext4_iomap_begin_report(struct inode *inode, loff_t offset,
+ loff_t length, unsigned flags,
+ struct iomap *iomap)
+{
+ int ret;
+ u16 type = 0;
+ struct ext4_map_blocks map;
+ u8 blkbits = inode->i_blkbits;
+ unsigned long first_block, last_block;
+
+ if ((offset >> blkbits) > EXT4_MAX_LOGICAL_BLOCK)
+ return -EINVAL;
+ first_block = offset >> blkbits;
+ last_block = min_t(loff_t, (offset + length - 1) >> blkbits,
+ EXT4_MAX_LOGICAL_BLOCK);
+
+ if (ext4_has_inline_data(inode)) {
+ ret = ext4_inline_data_iomap(inode, iomap);
+ if (ret != -EAGAIN) {
+ if (ret == 0 && offset >= iomap->length)
+ ret = -ENOENT;
+ return ret;
+ }
+ }
+
+ map.m_lblk = first_block;
+ map.m_len = last_block = first_block + 1;
+ ret = ext4_map_blocks(NULL, inode, &map, 0);
+ if (ret < 0)
+ return ret;
+ if (ret == 0)
+ type = ext4_iomap_check_delalloc(inode, &map);
+ return ext4_set_iomap(inode, iomap, type, first_block, &map);
We don't need to send first_block here. Since map->m_lblk
is same as first_block.
Also with Jan comment, we don't even need 'type' parameter.
Then we should be able to rename the function
ext4_set_iomap ==> ext4_map_to_iomap. This better reflects what it is
doing. Thoughts?
+}
+
+const struct iomap_ops ext4_iomap_report_ops = {
+ .iomap_begin = ext4_iomap_begin_report,
+};
+
static int ext4_iomap_alloc(struct inode *inode,
unsigned flags,
unsigned long first_block,
@@ -3498,12 +3564,10 @@ static int ext4_iomap_alloc(struct inode *inode,
static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
unsigned flags, struct iomap *iomap)
{
- u16 type = 0;
- unsigned int blkbits = inode->i_blkbits;
- unsigned long first_block, last_block;
- struct ext4_map_blocks map;
- bool delalloc = false;
int ret;
+ struct ext4_map_blocks map;
+ u8 blkbits = inode->i_blkbits;
+ unsigned long first_block, last_block;
if ((offset >> blkbits) > EXT4_MAX_LOGICAL_BLOCK)
return -EINVAL;
@@ -3511,64 +3575,21 @@ static int ext4_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
last_block = min_t(loff_t, (offset + length - 1) >> blkbits,
EXT4_MAX_LOGICAL_BLOCK);
- if (flags & IOMAP_REPORT) {
- if (ext4_has_inline_data(inode)) {
- ret = ext4_inline_data_iomap(inode, iomap);
- if (ret != -EAGAIN) {
- if (ret == 0 && offset >= iomap->length)
- ret = -ENOENT;
- return ret;
- }
- }
- } else {
- if (WARN_ON_ONCE(ext4_has_inline_data(inode)))
- return -ERANGE;
- }
+ if (WARN_ON_ONCE(ext4_has_inline_data(inode)))
+ return -ERANGE;
map.m_lblk = first_block;
map.m_len = last_block - first_block + 1;
- if (flags & IOMAP_REPORT) {
- ret = ext4_map_blocks(NULL, inode, &map, 0);
- if (ret < 0)
- return ret;
-
- if (ret == 0) {
- ext4_lblk_t end = map.m_lblk + map.m_len - 1;
- struct extent_status es;
-
- ext4_es_find_extent_range(inode, &ext4_es_is_delayed,
- map.m_lblk, end, &es);
-
- if (!es.es_len || es.es_lblk > end) {
- /* entire range is a hole */
- } else if (es.es_lblk > map.m_lblk) {
- /* range starts with a hole */
- map.m_len = es.es_lblk - map.m_lblk;
- } else {
- ext4_lblk_t offs = 0;
-
- if (es.es_lblk < map.m_lblk)
- offs = map.m_lblk - es.es_lblk;
- map.m_lblk = es.es_lblk + offs;
- map.m_len = es.es_len - offs;
- delalloc = true;
- }
- }
- } else if (flags & IOMAP_WRITE) {
+ if (flags & IOMAP_WRITE)
ret = ext4_iomap_alloc(inode, flags, first_block, &map);
- } else {
+ else
ret = ext4_map_blocks(NULL, inode, &map, 0);
- if (ret < 0)
- return ret;
- }
if (ret < 0)
return ret;
-
- if (!ret)
- type = delalloc ? IOMAP_DELALLOC : IOMAP_HOLE;
- return ext4_set_iomap(inode, iomap, type, first_block, &map);
+ return ext4_set_iomap(inode, iomap, ret ? 0 : IOMAP_HOLE, first_block,
+ &map);
}
static int ext4_iomap_end(struct inode *inode, loff_t offset, loff_t length,
