[PATCH] writeback: fix range handling

When a writeback_control's `start' and `end' fields are used to
indicate a one-byte-range starting at file offset zero, the required
values of .start=0,.end=0 mean that the ->writepages() implementation
has no way of telling that it is being asked to perform a range
request.  Because we're currently overloading (start == 0 && end == 0)
to mean "this is not a write-a-range request".

To make all this sane, the patch changes range of writeback_control.

So caller does: If it is calling ->writepages() to write pages, it
sets range (range_start/end or range_cyclic) always.

And if range_cyclic is true, ->writepages() thinks the range is
cyclic, otherwise it just uses range_start and range_end.

This patch does,

    - Add LLONG_MAX, LLONG_MIN, ULLONG_MAX to include/linux/kernel.h
      -1 is usually ok for range_end (type is long long). But, if someone did,

		range_end += val;		range_end is "val - 1"
		u64val = range_end >> bits;	u64val is "~(0ULL)"

      or something, they are wrong. So, this adds LLONG_MAX to avoid nasty
      things, and uses LLONG_MAX for range_end.

    - All callers of ->writepages() sets range_start/end or range_cyclic.

    - Fix updates of ->writeback_index. It seems already bit strange.
      If it starts at 0 and ended by check of nr_to_write, this last
      index may reduce chance to scan end of file.  So, this updates
      ->writeback_index only if range_cyclic is true or whole-file is
      scanned.

Signed-off-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Cc: Nathan Scott <nathans@sgi.com>
Cc: Anton Altaparmakov <aia21@cantab.net>
Cc: Steven French <sfrench@us.ibm.com>
Cc: "Vladimir V. Saveliev" <vs@namesys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

4 files changed, 26 insertions, 26 deletions

diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index e2b4ce1dad66..487ea8b3baaa 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -1079,9 +1079,9 @@ static int cifs_writepages(struct address_space *mapping,
         unsigned int bytes_written;
         struct cifs_sb_info *cifs_sb;
         int done = 0;
-        pgoff_t end = -1;
+        pgoff_t end;
         pgoff_t index;
-        int is_range = 0;
+        int range_whole = 0;
         struct kvec iov[32];
         int len;
         int n_iov = 0;
@@ -1122,16 +1122,14 @@ static int cifs_writepages(struct address_space *mapping,
         xid = GetXid();
 
         pagevec_init(&pvec, 0);
-        if (wbc->sync_mode == WB_SYNC_NONE)
+        if (wbc->range_cyclic) {
                 index = mapping->writeback_index; /* Start from prev offset */
-        else {
-                index = 0;
-                scanned = 1;
-        }
-        if (wbc->start || wbc->end) {
-                index = wbc->start >> PAGE_CACHE_SHIFT;
-                end = wbc->end >> PAGE_CACHE_SHIFT;
-                is_range = 1;
+                end = -1;
+        } else {
+                index = wbc->range_start >> PAGE_CACHE_SHIFT;
+                end = wbc->range_end >> PAGE_CACHE_SHIFT;
+                if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
+                        range_whole = 1;
                 scanned = 1;
         }
 retry:
@@ -1167,7 +1165,7 @@ retry:
                                 break;
                         }
 
-                        if (unlikely(is_range) && (page->index > end)) {
+                        if (!wbc->range_cyclic && page->index > end) {
                                 done = 1;
                                 unlock_page(page);
                                 break;
@@ -1271,7 +1269,7 @@ retry:
                 index = 0;
                 goto retry;
         }
-        if (!is_range)
+        if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
                 mapping->writeback_index = index;
 
         FreeXid(xid);
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index f3fbe2d030f4..6db95cf3aaa2 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -461,6 +461,8 @@ void sync_inodes_sb(struct super_block *sb, int wait)
 {
         struct writeback_control wbc = {
                 .sync_mode      = wait ? WB_SYNC_ALL : WB_SYNC_HOLD,
+                .range_start    = 0,
+                .range_end      = LLONG_MAX,
         };
         unsigned long nr_dirty = read_page_state(nr_dirty);
         unsigned long nr_unstable = read_page_state(nr_unstable);
@@ -559,6 +561,8 @@ int write_inode_now(struct inode *inode, int sync)
         struct writeback_control wbc = {
                 .nr_to_write = LONG_MAX,
                 .sync_mode = WB_SYNC_ALL,
+                .range_start = 0,
+                .range_end = LLONG_MAX,
         };
 
         if (!mapping_cap_writeback_dirty(inode->i_mapping))
diff --git a/fs/mpage.c b/fs/mpage.c
index 9bf2eb30e6f4..1e4598247d0b 100644
--- a/fs/mpage.c
+++ b/fs/mpage.c
@@ -707,9 +707,9 @@ mpage_writepages(struct address_space *mapping,
         struct pagevec pvec;
         int nr_pages;
         pgoff_t index;
-        pgoff_t end = -1;               /* Inclusive */
+        pgoff_t end;            /* Inclusive */
         int scanned = 0;
-        int is_range = 0;
+        int range_whole = 0;
 
         if (wbc->nonblocking && bdi_write_congested(bdi)) {
                 wbc->encountered_congestion = 1;
@@ -721,16 +721,14 @@ mpage_writepages(struct address_space *mapping,
                 writepage = mapping->a_ops->writepage;
 
         pagevec_init(&pvec, 0);
-        if (wbc->sync_mode == WB_SYNC_NONE) {
+        if (wbc->range_cyclic) {
                 index = mapping->writeback_index; /* Start from prev offset */
+                end = -1;
         } else {
-                index = 0;                        /* whole-file sweep */
-                scanned = 1;
-        }
-        if (wbc->start || wbc->end) {
-                index = wbc->start >> PAGE_CACHE_SHIFT;
-                end = wbc->end >> PAGE_CACHE_SHIFT;
-                is_range = 1;
+                index = wbc->range_start >> PAGE_CACHE_SHIFT;
+                end = wbc->range_end >> PAGE_CACHE_SHIFT;
+                if (wbc->range_start == 0 && wbc->range_end == LLONG_MAX)
+                        range_whole = 1;
                 scanned = 1;
         }
 retry:
@@ -759,7 +757,7 @@ retry:
                                 continue;
                         }
 
-                        if (unlikely(is_range) && page->index > end) {
+                        if (!wbc->range_cyclic && page->index > end) {
                                 done = 1;
                                 unlock_page(page);
                                 continue;
@@ -810,7 +808,7 @@ retry:
                 index = 0;
                 goto retry;
         }
-        if (!is_range)
+        if (wbc->range_cyclic || (range_whole && wbc->nr_to_write > 0))
                 mapping->writeback_index = index;
         if (bio)
                 mpage_bio_submit(WRITE, bio);
diff --git a/fs/sync.c b/fs/sync.c
index aab5ffe77e9f..955aef04da28 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -100,7 +100,7 @@ asmlinkage long sys_sync_file_range(int fd, loff_t offset, loff_t nbytes,
         }
 
         if (nbytes == 0)
-                endbyte = -1;
+                endbyte = LLONG_MAX;
         else
                 endbyte--;              /* inclusive */