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-rw-r--r--fs/f2fs/data.c22
-rw-r--r--fs/f2fs/f2fs.h3
2 files changed, 21 insertions, 4 deletions
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 5920639..2e54522 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -71,6 +71,9 @@ static int check_extent_cache(struct inode *inode, pgoff_t pgofs,
pgoff_t start_fofs, end_fofs;
block_t start_blkaddr;
+ if (is_inode_flag_set(fi, FI_NO_EXTENT))
+ return 0;
+
read_lock(&fi->ext.ext_lock);
if (fi->ext.len == 0) {
read_unlock(&fi->ext.ext_lock);
@@ -109,6 +112,7 @@ void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
struct f2fs_inode_info *fi = F2FS_I(dn->inode);
pgoff_t fofs, start_fofs, end_fofs;
block_t start_blkaddr, end_blkaddr;
+ int need_update = true;
f2fs_bug_on(blk_addr == NEW_ADDR);
fofs = start_bidx_of_node(ofs_of_node(dn->node_page), fi) +
@@ -117,6 +121,9 @@ void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
/* Update the page address in the parent node */
__set_data_blkaddr(dn, blk_addr);
+ if (is_inode_flag_set(fi, FI_NO_EXTENT))
+ return;
+
write_lock(&fi->ext.ext_lock);
start_fofs = fi->ext.fofs;
@@ -163,14 +170,21 @@ void update_extent_cache(block_t blk_addr, struct dnode_of_data *dn)
fofs - start_fofs + 1;
fi->ext.len -= fofs - start_fofs + 1;
}
- goto end_update;
+ } else {
+ need_update = false;
}
- write_unlock(&fi->ext.ext_lock);
- return;
+ /* Finally, if the extent is very fragmented, let's drop the cache. */
+ if (fi->ext.len < F2FS_MIN_EXTENT_LEN) {
+ fi->ext.len = 0;
+ set_inode_flag(fi, FI_NO_EXTENT);
+ need_update = true;
+ }
end_update:
write_unlock(&fi->ext.ext_lock);
- sync_inode_page(dn);
+ if (need_update)
+ sync_inode_page(dn);
+ return;
}
struct page *find_data_page(struct inode *inode, pgoff_t index, bool sync)
diff --git a/fs/f2fs/f2fs.h b/fs/f2fs/f2fs.h
index c2de549..e9038bb 100644
--- a/fs/f2fs/f2fs.h
+++ b/fs/f2fs/f2fs.h
@@ -169,6 +169,8 @@ enum {
#define F2FS_LINK_MAX 32000 /* maximum link count per file */
/* for in-memory extent cache entry */
+#define F2FS_MIN_EXTENT_LEN 16 /* minimum extent length */
+
struct extent_info {
rwlock_t ext_lock; /* rwlock for consistency */
unsigned int fofs; /* start offset in a file */
@@ -889,6 +891,7 @@ enum {
FI_NO_ALLOC, /* should not allocate any blocks */
FI_UPDATE_DIR, /* should update inode block for consistency */
FI_DELAY_IPUT, /* used for the recovery */
+ FI_NO_EXTENT, /* not to use the extent cache */
FI_INLINE_XATTR, /* used for inline xattr */
};
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