nilfs2: simplify handling of active state of segments
will reduce some lines of segment constructor. Previously, the state was
complexly controlled through a list of segments in order to keep
consistency in meta data of usage state of segments. Instead, this
presents ``calculated'' active flags to userland cleaner program and stop
maintaining its real flag on disk.
Only by this fake flag, the cleaner cannot exactly know if each segment is
reclaimable or not. However, the recent extension of nilfs_sustat ioctl
struct (nilfs2-extend-nilfs_sustat-ioctl-struct.patch) can prevent the
cleaner from reclaiming in-use segment wrongly.
So, now I can apply this for simplification.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/nilfs2/recovery.c b/fs/nilfs2/recovery.c
index ef387b1..6ab4c8f 100644
--- a/fs/nilfs2/recovery.c
+++ b/fs/nilfs2/recovery.c
@@ -463,16 +463,6 @@
nilfs_free_segment_entry(ent);
}
- /*
- * The segment having the latest super root is active, and
- * should be deactivated on the next construction for recovery.
- */
- err = -ENOMEM;
- ent = nilfs_alloc_segment_entry(segnum[0]);
- if (unlikely(!ent))
- goto failed;
- list_add_tail(&ent->list, &ri->ri_used_segments);
-
/* Allocate new segments for recovery */
err = nilfs_sufile_alloc(sufile, &segnum[0]);
if (unlikely(err))
@@ -757,7 +747,7 @@
goto failed;
}
- err = nilfs_attach_segment_constructor(sbi, ri);
+ err = nilfs_attach_segment_constructor(sbi);
if (unlikely(err))
goto failed;
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index 3d3ea83..1e68821 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -64,27 +64,17 @@
INIT_LIST_HEAD(&segbuf->sb_list);
INIT_LIST_HEAD(&segbuf->sb_segsum_buffers);
INIT_LIST_HEAD(&segbuf->sb_payload_buffers);
- segbuf->sb_segent = NULL;
return segbuf;
}
void nilfs_segbuf_free(struct nilfs_segment_buffer *segbuf)
{
- struct nilfs_segment_entry *ent = segbuf->sb_segent;
-
- if (ent != NULL && list_empty(&ent->list)) {
- /* free isolated segment list head */
- nilfs_free_segment_entry(segbuf->sb_segent);
- segbuf->sb_segent = NULL;
- }
kmem_cache_free(nilfs_segbuf_cachep, segbuf);
}
-int nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,
+void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,
unsigned long offset, struct the_nilfs *nilfs)
{
- struct nilfs_segment_entry *ent;
-
segbuf->sb_segnum = segnum;
nilfs_get_segment_range(nilfs, segnum, &segbuf->sb_fseg_start,
&segbuf->sb_fseg_end);
@@ -92,18 +82,6 @@
segbuf->sb_pseg_start = segbuf->sb_fseg_start + offset;
segbuf->sb_rest_blocks =
segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
-
- /* Attach a segment list head */
- ent = segbuf->sb_segent;
- if (ent == NULL) {
- segbuf->sb_segent = nilfs_alloc_segment_entry(segnum);
- if (unlikely(!segbuf->sb_segent))
- return -ENOMEM;
- } else {
- BUG_ON(ent->bh_su || !list_empty(&ent->list));
- ent->segnum = segnum;
- }
- return 0;
}
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,
diff --git a/fs/nilfs2/segbuf.h b/fs/nilfs2/segbuf.h
index 25f2a5f..0c3076f 100644
--- a/fs/nilfs2/segbuf.h
+++ b/fs/nilfs2/segbuf.h
@@ -68,7 +68,6 @@
* struct nilfs_segment_buffer - Segment buffer
* @sb_super: back pointer to a superblock struct
* @sb_list: List head to chain this structure
- * @sb_segent: Pointer for attaching a segment entry
* @sb_sum: On-memory segment summary
* @sb_segnum: Index number of the full segment
* @sb_nextnum: Index number of the next full segment
@@ -83,7 +82,6 @@
struct nilfs_segment_buffer {
struct super_block *sb_super;
struct list_head sb_list;
- struct nilfs_segment_entry *sb_segent;
/* Segment information */
struct nilfs_segsum_info sb_sum;
@@ -125,8 +123,8 @@
void nilfs_destroy_segbuf_cache(void);
struct nilfs_segment_buffer *nilfs_segbuf_new(struct super_block *);
void nilfs_segbuf_free(struct nilfs_segment_buffer *);
-int nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
- struct the_nilfs *);
+void nilfs_segbuf_map(struct nilfs_segment_buffer *, __u64, unsigned long,
+ struct the_nilfs *);
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *, __u64,
struct the_nilfs *);
int nilfs_segbuf_reset(struct nilfs_segment_buffer *, unsigned, time_t);
diff --git a/fs/nilfs2/segment.c b/fs/nilfs2/segment.c
index 2879704..e43558d 100644
--- a/fs/nilfs2/segment.c
+++ b/fs/nilfs2/segment.c
@@ -1304,25 +1304,6 @@
return err;
}
-static int nilfs_segctor_terminate_segment(struct nilfs_sc_info *sci,
- struct nilfs_segment_buffer *segbuf,
- struct inode *sufile)
-{
- struct nilfs_segment_entry *ent = segbuf->sb_segent;
- int err;
-
- err = nilfs_open_segment_entry(ent, sufile);
- if (unlikely(err))
- return err;
- nilfs_mdt_mark_buffer_dirty(ent->bh_su);
- nilfs_mdt_mark_dirty(sufile);
- nilfs_close_segment_entry(ent, sufile);
-
- list_add_tail(&ent->list, &sci->sc_active_segments);
- segbuf->sb_segent = NULL;
- return 0;
-}
-
static int nilfs_touch_segusage(struct inode *sufile, __u64 segnum)
{
struct buffer_head *bh_su;
@@ -1342,7 +1323,6 @@
struct the_nilfs *nilfs)
{
struct nilfs_segment_buffer *segbuf, *n;
- struct inode *sufile = nilfs->ns_sufile;
__u64 nextnum;
int err;
@@ -1354,28 +1334,22 @@
} else
segbuf = NILFS_FIRST_SEGBUF(&sci->sc_segbufs);
- err = nilfs_segbuf_map(segbuf, nilfs->ns_segnum,
- nilfs->ns_pseg_offset, nilfs);
- if (unlikely(err))
- return err;
+ nilfs_segbuf_map(segbuf, nilfs->ns_segnum, nilfs->ns_pseg_offset,
+ nilfs);
if (segbuf->sb_rest_blocks < NILFS_PSEG_MIN_BLOCKS) {
- err = nilfs_segctor_terminate_segment(sci, segbuf, sufile);
- if (unlikely(err))
- return err;
-
nilfs_shift_to_next_segment(nilfs);
- err = nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
+ nilfs_segbuf_map(segbuf, nilfs->ns_segnum, 0, nilfs);
}
sci->sc_segbuf_nblocks = segbuf->sb_rest_blocks;
- err = nilfs_touch_segusage(sufile, segbuf->sb_segnum);
+ err = nilfs_touch_segusage(nilfs->ns_sufile, segbuf->sb_segnum);
if (unlikely(err))
return err;
if (nilfs->ns_segnum == nilfs->ns_nextnum) {
/* Start from the head of a new full segment */
- err = nilfs_sufile_alloc(sufile, &nextnum);
+ err = nilfs_sufile_alloc(nilfs->ns_sufile, &nextnum);
if (unlikely(err))
return err;
} else
@@ -1390,7 +1364,7 @@
list_del_init(&segbuf->sb_list);
nilfs_segbuf_free(segbuf);
}
- return err;
+ return 0;
}
static int nilfs_segctor_extend_segments(struct nilfs_sc_info *sci,
@@ -1421,10 +1395,7 @@
goto failed;
/* map this buffer to region of segment on-disk */
- err = nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
- if (unlikely(err))
- goto failed_segbuf;
-
+ nilfs_segbuf_map(segbuf, prev->sb_nextnum, 0, nilfs);
sci->sc_segbuf_nblocks += segbuf->sb_rest_blocks;
/* allocate the next next full segment */
@@ -2178,102 +2149,6 @@
}
/*
- * Nasty routines to manipulate active flags on sufile.
- * These would be removed in a future release.
- */
-static void nilfs_segctor_reactivate_segments(struct nilfs_sc_info *sci,
- struct the_nilfs *nilfs)
-{
- struct nilfs_segment_buffer *segbuf, *last;
- struct nilfs_segment_entry *ent, *n;
- struct inode *sufile = nilfs->ns_sufile;
- struct list_head *head;
-
- last = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
- nilfs_for_each_segbuf_before(segbuf, last, &sci->sc_segbufs) {
- ent = segbuf->sb_segent;
- if (!ent)
- break; /* ignore unmapped segments (should check it?)*/
- nilfs_segment_usage_set_active(ent->raw_su);
- nilfs_close_segment_entry(ent, sufile);
- }
-
- head = &sci->sc_active_segments;
- list_for_each_entry_safe(ent, n, head, list) {
- nilfs_segment_usage_set_active(ent->raw_su);
- nilfs_close_segment_entry(ent, sufile);
- }
-}
-
-static int nilfs_segctor_deactivate_segments(struct nilfs_sc_info *sci,
- struct the_nilfs *nilfs)
-{
- struct nilfs_segment_buffer *segbuf, *last;
- struct nilfs_segment_entry *ent;
- struct inode *sufile = nilfs->ns_sufile;
- int err;
-
- last = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
- nilfs_for_each_segbuf_before(segbuf, last, &sci->sc_segbufs) {
- /*
- * Deactivate ongoing full segments. The last segment is kept
- * active because it is a start point of recovery, and is not
- * relocatable until the super block points to a newer
- * checkpoint.
- */
- ent = segbuf->sb_segent;
- if (!ent)
- break; /* ignore unmapped segments (should check it?)*/
- err = nilfs_open_segment_entry(ent, sufile);
- if (unlikely(err))
- goto failed;
- nilfs_segment_usage_clear_active(ent->raw_su);
- BUG_ON(!buffer_dirty(ent->bh_su));
- }
-
- list_for_each_entry(ent, &sci->sc_active_segments, list) {
- err = nilfs_open_segment_entry(ent, sufile);
- if (unlikely(err))
- goto failed;
- nilfs_segment_usage_clear_active(ent->raw_su);
- WARN_ON(!buffer_dirty(ent->bh_su));
- }
- return 0;
-
- failed:
- nilfs_segctor_reactivate_segments(sci, nilfs);
- return err;
-}
-
-static void nilfs_segctor_bead_completed_segments(struct nilfs_sc_info *sci)
-{
- struct nilfs_segment_buffer *segbuf, *last;
- struct nilfs_segment_entry *ent;
-
- /* move each segbuf->sb_segent to the list of used active segments */
- last = NILFS_LAST_SEGBUF(&sci->sc_segbufs);
- nilfs_for_each_segbuf_before(segbuf, last, &sci->sc_segbufs) {
- ent = segbuf->sb_segent;
- if (!ent)
- break; /* ignore unmapped segments (should check it?)*/
- list_add_tail(&ent->list, &sci->sc_active_segments);
- segbuf->sb_segent = NULL;
- }
-}
-
-static void nilfs_segctor_commit_deactivate_segments(struct nilfs_sc_info *sci,
- struct the_nilfs *nilfs)
-{
- struct nilfs_segment_entry *ent, *n;
-
- list_for_each_entry_safe(ent, n, &sci->sc_active_segments, list) {
- list_del(&ent->list);
- nilfs_close_segment_entry(ent, nilfs->ns_sufile);
- nilfs_free_segment_entry(ent);
- }
-}
-
-/*
* Main procedure of segment constructor
*/
static int nilfs_segctor_do_construct(struct nilfs_sc_info *sci, int mode)
@@ -2322,11 +2197,6 @@
if (unlikely(err))
goto failed;
- if (has_sr) {
- err = nilfs_segctor_deactivate_segments(sci, nilfs);
- if (unlikely(err))
- goto failed;
- }
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
nilfs_segctor_fill_in_file_bmap(sci, sbi->s_ifile);
@@ -2353,12 +2223,10 @@
nilfs_segctor_complete_write(sci);
/* Commit segments */
- nilfs_segctor_bead_completed_segments(sci);
if (has_sr) {
down_write(&nilfs->ns_sem);
nilfs_update_last_segment(sbi, 1);
up_write(&nilfs->ns_sem);
- nilfs_segctor_commit_deactivate_segments(sci, nilfs);
nilfs_segctor_commit_free_segments(sci);
nilfs_segctor_clear_metadata_dirty(sci);
}
@@ -2379,8 +2247,6 @@
failed_to_make_up:
if (sci->sc_stage.flags & NILFS_CF_IFILE_STARTED)
nilfs_redirty_inodes(&sci->sc_dirty_files);
- if (has_sr)
- nilfs_segctor_reactivate_segments(sci, nilfs);
failed:
if (nilfs_doing_gc())
@@ -2942,23 +2808,11 @@
}
}
-static int nilfs_segctor_init(struct nilfs_sc_info *sci,
- struct nilfs_recovery_info *ri)
+static int nilfs_segctor_init(struct nilfs_sc_info *sci)
{
- int err;
-
sci->sc_seq_done = sci->sc_seq_request;
- if (ri)
- list_splice_init(&ri->ri_used_segments,
- sci->sc_active_segments.prev);
- err = nilfs_segctor_start_thread(sci);
- if (err) {
- if (ri)
- list_splice_init(&sci->sc_active_segments,
- ri->ri_used_segments.prev);
- }
- return err;
+ return nilfs_segctor_start_thread(sci);
}
/*
@@ -2982,7 +2836,6 @@
INIT_LIST_HEAD(&sci->sc_dirty_files);
INIT_LIST_HEAD(&sci->sc_segbufs);
INIT_LIST_HEAD(&sci->sc_gc_inodes);
- INIT_LIST_HEAD(&sci->sc_active_segments);
INIT_LIST_HEAD(&sci->sc_cleaning_segments);
INIT_LIST_HEAD(&sci->sc_copied_buffers);
@@ -3048,8 +2901,6 @@
"dirty file(s) after the final construction\n");
nilfs_dispose_list(sbi, &sci->sc_dirty_files, 1);
}
- if (!list_empty(&sci->sc_active_segments))
- nilfs_dispose_segment_list(&sci->sc_active_segments);
if (!list_empty(&sci->sc_cleaning_segments))
nilfs_dispose_segment_list(&sci->sc_cleaning_segments);
@@ -3064,7 +2915,6 @@
/**
* nilfs_attach_segment_constructor - attach a segment constructor
* @sbi: nilfs_sb_info
- * @ri: nilfs_recovery_info
*
* nilfs_attach_segment_constructor() allocates a struct nilfs_sc_info,
* initilizes it, and starts the segment constructor.
@@ -3074,8 +2924,7 @@
*
* %-ENOMEM - Insufficient memory available.
*/
-int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi,
- struct nilfs_recovery_info *ri)
+int nilfs_attach_segment_constructor(struct nilfs_sb_info *sbi)
{
struct the_nilfs *nilfs = sbi->s_nilfs;
int err;
@@ -3087,7 +2936,7 @@
return -ENOMEM;
nilfs_attach_writer(nilfs, sbi);
- err = nilfs_segctor_init(NILFS_SC(sbi), ri);
+ err = nilfs_segctor_init(NILFS_SC(sbi));
if (err) {
nilfs_detach_writer(nilfs, sbi);
kfree(sbi->s_sc_info);
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index bb7d417..4a64eb8 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -90,7 +90,6 @@
* @sc_nblk_inc: Block count of current generation
* @sc_dirty_files: List of files to be written
* @sc_gc_inodes: List of GC inodes having blocks to be written
- * @sc_active_segments: List of active segments that were already written out
* @sc_cleaning_segments: List of segments to be freed through construction
* @sc_copied_buffers: List of copied buffers (buffer heads) to freeze data
* @sc_dsync_inode: inode whose data pages are written for a sync operation
@@ -132,7 +131,6 @@
struct list_head sc_dirty_files;
struct list_head sc_gc_inodes;
- struct list_head sc_active_segments;
struct list_head sc_cleaning_segments;
struct list_head sc_copied_buffers;
@@ -232,8 +230,7 @@
__u64 *, size_t);
extern void nilfs_segctor_clear_segments_to_be_freed(struct nilfs_sc_info *);
-extern int nilfs_attach_segment_constructor(struct nilfs_sb_info *,
- struct nilfs_recovery_info *);
+extern int nilfs_attach_segment_constructor(struct nilfs_sb_info *);
extern void nilfs_detach_segment_constructor(struct nilfs_sb_info *);
/* recovery.c */
diff --git a/fs/nilfs2/sufile.c b/fs/nilfs2/sufile.c
index 4cf47e0..c774cf3 100644
--- a/fs/nilfs2/sufile.c
+++ b/fs/nilfs2/sufile.c
@@ -158,7 +158,6 @@
if (!nilfs_segment_usage_clean(su))
continue;
/* found a clean segment */
- nilfs_segment_usage_set_active(su);
nilfs_segment_usage_set_dirty(su);
kunmap_atomic(kaddr, KM_USER0);
@@ -591,6 +590,7 @@
struct buffer_head *su_bh;
struct nilfs_segment_usage *su;
size_t susz = NILFS_MDT(sufile)->mi_entry_size;
+ struct the_nilfs *nilfs = NILFS_MDT(sufile)->mi_nilfs;
void *kaddr;
unsigned long nsegs, segusages_per_block;
ssize_t n;
@@ -623,7 +623,11 @@
for (j = 0; j < n; j++, su = (void *)su + susz) {
si[i + j].sui_lastmod = le64_to_cpu(su->su_lastmod);
si[i + j].sui_nblocks = le32_to_cpu(su->su_nblocks);
- si[i + j].sui_flags = le32_to_cpu(su->su_flags);
+ si[i + j].sui_flags = le32_to_cpu(su->su_flags) &
+ ~(1UL << NILFS_SEGMENT_USAGE_ACTIVE);
+ if (nilfs_segment_is_active(nilfs, segnum + i + j))
+ si[i + j].sui_flags |=
+ (1UL << NILFS_SEGMENT_USAGE_ACTIVE);
}
kunmap_atomic(kaddr, KM_USER0);
brelse(su_bh);
diff --git a/fs/nilfs2/super.c b/fs/nilfs2/super.c
index b7519c3..ef31e9a 100644
--- a/fs/nilfs2/super.c
+++ b/fs/nilfs2/super.c
@@ -868,7 +868,7 @@
}
if (!(sb->s_flags & MS_RDONLY)) {
- err = nilfs_attach_segment_constructor(sbi, NULL);
+ err = nilfs_attach_segment_constructor(sbi);
if (err)
goto failed_checkpoint;
}
@@ -1001,7 +1001,7 @@
nilfs_clear_opt(sbi, SNAPSHOT);
sbi->s_snapshot_cno = 0;
- err = nilfs_attach_segment_constructor(sbi, NULL);
+ err = nilfs_attach_segment_constructor(sbi);
if (err)
goto rw_remount_failed;
diff --git a/fs/nilfs2/the_nilfs.h b/fs/nilfs2/the_nilfs.h
index af566e7..d750e48 100644
--- a/fs/nilfs2/the_nilfs.h
+++ b/fs/nilfs2/the_nilfs.h
@@ -280,4 +280,9 @@
return cno;
}
+static inline int nilfs_segment_is_active(struct the_nilfs *nilfs, __u64 n)
+{
+ return n == nilfs->ns_segnum || n == nilfs->ns_nextnum;
+}
+
#endif /* _THE_NILFS_H */