Add a helper to deal with everything needed to return a f2fs_map_blocks
structure based on a lookup in the extent cache.
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
fs/f2fs/data.c | 62 +++++++++++++++++++++++++++++++-------------------
1 file changed, 38 insertions(+), 24 deletions(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 730b58ba97c0ae..f6124cedd121a2 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -1449,6 +1449,41 @@ int f2fs_get_block_locked(struct dnode_of_data *dn,
pgoff_t index)
return err;
}
+static bool f2fs_map_blocks_cached(struct inode *inode,
+ struct f2fs_map_blocks *map, int flag)
+{
+ struct f2fs_sb_info *sbi = F2FS_I_SB(inode);
+ unsigned int maxblocks = map->m_len;
+ pgoff_t pgoff = (pgoff_t)map->m_lblk;
+ struct extent_info ei = {};
+
+ if (!f2fs_lookup_extent_cache(inode, pgoff, &ei))
+ return false;
+
+ map->m_pblk = ei.blk + pgoff - ei.fofs;
+ map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgoff);
+ map->m_flags = F2FS_MAP_MAPPED;
+ if (map->m_next_extent)
+ *map->m_next_extent = pgoff + map->m_len;
+
+ /* for hardware encryption, but to avoid potential issue in future */
+ if (flag == F2FS_GET_BLOCK_DIO)
+ f2fs_wait_on_block_writeback_range(inode,
+ map->m_pblk, map->m_len);
+
+ if (f2fs_allow_multi_device_dio(sbi, flag)) {
+ int bidx = f2fs_target_device_index(sbi, map->m_pblk);
+ struct f2fs_dev_info *dev = &sbi->devs[bidx];
+
+ map->m_bdev = dev->bdev;
+ map->m_pblk -= dev->start_blk;
+ map->m_len = min(map->m_len, dev->end_blk + 1 - map->m_pblk);
+ } else {
+ map->m_bdev = inode->i_sb->s_bdev;
+ }
+ return true;
+}
+
/*
* f2fs_map_blocks() tries to find or build mapping relationship which
* maps continuous logical blocks to physical blocks, and return such
@@ -1464,7 +1499,6 @@ int f2fs_map_blocks(struct inode *inode, struct
f2fs_map_blocks *map, int flag)
int err = 0, ofs = 1;
unsigned int ofs_in_node, last_ofs_in_node;
blkcnt_t prealloc;
- struct extent_info ei = {0, };
block_t blkaddr;
unsigned int start_pgofs;
int bidx = 0;
@@ -1472,6 +1506,9 @@ int f2fs_map_blocks(struct inode *inode, struct
f2fs_map_blocks *map, int flag)
if (!maxblocks)
return 0;
+ if (!map->m_may_create && f2fs_map_blocks_cached(inode, map, flag))
+ goto out;
+
map->m_bdev = inode->i_sb->s_bdev;
map->m_multidev_dio =
f2fs_allow_multi_device_dio(F2FS_I_SB(inode), flag);
@@ -1483,29 +1520,6 @@ int f2fs_map_blocks(struct inode *inode, struct
f2fs_map_blocks *map, int flag)
pgofs = (pgoff_t)map->m_lblk;
end = pgofs + maxblocks;
- if (!map->m_may_create && f2fs_lookup_extent_cache(inode, pgofs, &ei)) {
- map->m_pblk = ei.blk + pgofs - ei.fofs;
- map->m_len = min((pgoff_t)maxblocks, ei.fofs + ei.len - pgofs);
- map->m_flags = F2FS_MAP_MAPPED;
- if (map->m_next_extent)
- *map->m_next_extent = pgofs + map->m_len;
-
- /* for hardware encryption, but to avoid potential issue in
future */
- if (flag == F2FS_GET_BLOCK_DIO)
- f2fs_wait_on_block_writeback_range(inode,
- map->m_pblk, map->m_len);
-
- if (map->m_multidev_dio) {
- bidx = f2fs_target_device_index(sbi, map->m_pblk);
-
- map->m_bdev = FDEV(bidx).bdev;
- map->m_pblk -= FDEV(bidx).start_blk;
- map->m_len = min(map->m_len,
- FDEV(bidx).end_blk + 1 - map->m_pblk);
- }
- goto out;
- }
-
next_dnode:
if (map->m_may_create)
f2fs_map_lock(sbi, flag);
--
2.30.2
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