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-rw-r--r--fs/logfs/logfs.h28
1 files changed, 21 insertions, 7 deletions
diff --git a/fs/logfs/logfs.h b/fs/logfs/logfs.h
index b84b0ee..93b55f3 100644
--- a/fs/logfs/logfs.h
+++ b/fs/logfs/logfs.h
@@ -144,6 +144,7 @@ struct logfs_area_ops {
* @erase: erase one segment
* @read: read from the device
* @erase: erase part of the device
+ * @can_write_buf: decide whether wbuf can be written to ofs
*/
struct logfs_device_ops {
struct page *(*find_first_sb)(struct super_block *sb, u64 *ofs);
@@ -153,6 +154,7 @@ struct logfs_device_ops {
void (*writeseg)(struct super_block *sb, u64 ofs, size_t len);
int (*erase)(struct super_block *sb, loff_t ofs, size_t len,
int ensure_write);
+ int (*can_write_buf)(struct super_block *sb, u64 ofs);
void (*sync)(struct super_block *sb);
void (*put_device)(struct super_block *sb);
};
@@ -257,10 +259,14 @@ struct logfs_shadow {
* struct shadow_tree
* @new: shadows where old_ofs==0, indexed by new_ofs
* @old: shadows where old_ofs!=0, indexed by old_ofs
+ * @segment_map: bitfield of segments containing shadows
+ * @no_shadowed_segment: number of segments containing shadows
*/
struct shadow_tree {
struct btree_head64 new;
struct btree_head64 old;
+ struct btree_head32 segment_map;
+ int no_shadowed_segments;
};
struct object_alias_item {
@@ -305,13 +311,14 @@ typedef int write_alias_t(struct super_block *sb, u64 ino, u64 bix,
level_t level, int child_no, __be64 val);
struct logfs_block_ops {
void (*write_block)(struct logfs_block *block);
- gc_level_t (*block_level)(struct logfs_block *block);
void (*free_block)(struct super_block *sb, struct logfs_block*block);
int (*write_alias)(struct super_block *sb,
struct logfs_block *block,
write_alias_t *write_one_alias);
};
+#define MAX_JOURNAL_ENTRIES 256
+
struct logfs_super {
struct mtd_info *s_mtd; /* underlying device */
struct block_device *s_bdev; /* underlying device */
@@ -378,7 +385,7 @@ struct logfs_super {
u32 s_journal_ec[LOGFS_JOURNAL_SEGS]; /* journal erasecounts */
u64 s_last_version;
struct logfs_area *s_journal_area; /* open journal segment */
- __be64 s_je_array[64];
+ __be64 s_je_array[MAX_JOURNAL_ENTRIES];
int s_no_je;
int s_sum_index; /* for the 12 summaries */
@@ -389,6 +396,7 @@ struct logfs_super {
int s_lock_count;
mempool_t *s_block_pool; /* struct logfs_block pool */
mempool_t *s_shadow_pool; /* struct logfs_shadow pool */
+ struct list_head s_writeback_list; /* writeback pages */
/*
* Space accounting:
* - s_used_bytes specifies space used to store valid data objects.
@@ -593,19 +601,19 @@ void freeseg(struct super_block *sb, u32 segno);
int logfs_init_areas(struct super_block *sb);
void logfs_cleanup_areas(struct super_block *sb);
int logfs_open_area(struct logfs_area *area, size_t bytes);
-void __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
+int __logfs_buf_write(struct logfs_area *area, u64 ofs, void *buf, size_t len,
int use_filler);
-static inline void logfs_buf_write(struct logfs_area *area, u64 ofs,
+static inline int logfs_buf_write(struct logfs_area *area, u64 ofs,
void *buf, size_t len)
{
- __logfs_buf_write(area, ofs, buf, len, 0);
+ return __logfs_buf_write(area, ofs, buf, len, 0);
}
-static inline void logfs_buf_recover(struct logfs_area *area, u64 ofs,
+static inline int logfs_buf_recover(struct logfs_area *area, u64 ofs,
void *buf, size_t len)
{
- __logfs_buf_write(area, ofs, buf, len, 1);
+ return __logfs_buf_write(area, ofs, buf, len, 1);
}
/* super.c */
@@ -722,4 +730,10 @@ static inline struct logfs_area *get_area(struct super_block *sb,
return logfs_super(sb)->s_area[(__force u8)gc_level];
}
+static inline void logfs_mempool_destroy(mempool_t *pool)
+{
+ if (pool)
+ mempool_destroy(pool);
+}
+
#endif
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