1 files changed, 73 insertions, 176 deletions

diff --git a/fs/buffer.c b/fs/buffer.c
index d54812b198e9..3e7dca279d1c 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -770,11 +770,12 @@ static int fsync_buffers_list(spinlock_t *lock, struct list_head *list)
                                 spin_unlock(lock);
                                 /*
                                  * Ensure any pending I/O completes so that
-                                 * ll_rw_block() actually writes the current
-                                 * contents - it is a noop if I/O is still in
-                                 * flight on potentially older contents.
+                                 * write_dirty_buffer() actually writes the
+                                 * current contents - it is a noop if I/O is
+                                 * still in flight on potentially older
+                                 * contents.
                                  */
-                                ll_rw_block(SWRITE_SYNC_PLUG, 1, &bh);
+                                write_dirty_buffer(bh, WRITE_SYNC_PLUG);
 
                                 /*
                                  * Kick off IO for the previous mapping. Note
@@ -1833,9 +1834,10 @@ void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)
 }
 EXPORT_SYMBOL(page_zero_new_buffers);
 
-static int __block_prepare_write(struct inode *inode, struct page *page,
-                unsigned from, unsigned to, get_block_t *get_block)
+int block_prepare_write(struct page *page, unsigned from, unsigned to,
+                get_block_t *get_block)
 {
+        struct inode *inode = page->mapping->host;
         unsigned block_start, block_end;
         sector_t block;
         int err = 0;
@@ -1908,10 +1910,13 @@ static int __block_prepare_write(struct inode *inode, struct page *page,
                 if (!buffer_uptodate(*wait_bh))
                         err = -EIO;
         }
-        if (unlikely(err))
+        if (unlikely(err)) {
                 page_zero_new_buffers(page, from, to);
+                ClearPageUptodate(page);
+        }
         return err;
 }
+EXPORT_SYMBOL(block_prepare_write);
 
 static int __block_commit_write(struct inode *inode, struct page *page,
                 unsigned from, unsigned to)
@@ -1948,90 +1953,41 @@ static int __block_commit_write(struct inode *inode, struct page *page,
         return 0;
 }
 
-/*
- * Filesystems implementing the new truncate sequence should use the
- * _newtrunc postfix variant which won't incorrectly call vmtruncate.
- * The filesystem needs to handle block truncation upon failure.
- */
-int block_write_begin_newtrunc(struct file *file, struct address_space *mapping,
-                        loff_t pos, unsigned len, unsigned flags,
-                        struct page **pagep, void **fsdata,
-                        get_block_t *get_block)
+int __block_write_begin(struct page *page, loff_t pos, unsigned len,
+                get_block_t *get_block)
 {
-        struct inode *inode = mapping->host;
-        int status = 0;
-        struct page *page;
-        pgoff_t index;
-        unsigned start, end;
-        int ownpage = 0;
+        unsigned start = pos & (PAGE_CACHE_SIZE - 1);
 
-        index = pos >> PAGE_CACHE_SHIFT;
-        start = pos & (PAGE_CACHE_SIZE - 1);
-        end = start + len;
-
-        page = *pagep;
-        if (page == NULL) {
-                ownpage = 1;
-                page = grab_cache_page_write_begin(mapping, index, flags);
-                if (!page) {
-                        status = -ENOMEM;
-                        goto out;
-                }
-                *pagep = page;
-        } else
-                BUG_ON(!PageLocked(page));
-
-        status = __block_prepare_write(inode, page, start, end, get_block);
-        if (unlikely(status)) {
-                ClearPageUptodate(page);
-
-                if (ownpage) {
-                        unlock_page(page);
-                        page_cache_release(page);
-                        *pagep = NULL;
-                }
-        }
-
-out:
-        return status;
+        return block_prepare_write(page, start, start + len, get_block);
 }
-EXPORT_SYMBOL(block_write_begin_newtrunc);
+EXPORT_SYMBOL(__block_write_begin);
 
 /*
  * block_write_begin takes care of the basic task of block allocation and
  * bringing partial write blocks uptodate first.
  *
- * If *pagep is not NULL, then block_write_begin uses the locked page
- * at *pagep rather than allocating its own. In this case, the page will
- * not be unlocked or deallocated on failure.
+ * The filesystem needs to handle block truncation upon failure.
  */
-int block_write_begin(struct file *file, struct address_space *mapping,
-                        loff_t pos, unsigned len, unsigned flags,
-                        struct page **pagep, void **fsdata,
-                        get_block_t *get_block)
+int block_write_begin(struct address_space *mapping, loff_t pos, unsigned len,
+                unsigned flags, struct page **pagep, get_block_t *get_block)
 {
-        int ret;
+        pgoff_t index = pos >> PAGE_CACHE_SHIFT;
+        struct page *page;
+        int status;
 
-        ret = block_write_begin_newtrunc(file, mapping, pos, len, flags,
-                                        pagep, fsdata, get_block);
+        page = grab_cache_page_write_begin(mapping, index, flags);
+        if (!page)
+                return -ENOMEM;
 
-        /*
-         * prepare_write() may have instantiated a few blocks
-         * outside i_size.  Trim these off again. Don't need
-         * i_size_read because we hold i_mutex.
-         *
-         * Filesystems which pass down their own page also cannot
-         * call into vmtruncate here because it would lead to lock
-         * inversion problems (*pagep is locked). This is a further
-         * example of where the old truncate sequence is inadequate.
-         */
-        if (unlikely(ret) && *pagep == NULL) {
-                loff_t isize = mapping->host->i_size;
-                if (pos + len > isize)
-                        vmtruncate(mapping->host, isize);
+        status = __block_write_begin(page, pos, len, get_block);
+        if (unlikely(status)) {
+                unlock_page(page);
+                page_cache_release(page);
+                page = NULL;
         }
 
-        return ret;
+        *pagep = page;
+        return status;
 }
 EXPORT_SYMBOL(block_write_begin);
 
@@ -2351,7 +2307,7 @@ out:
  * For moronic filesystems that do not allow holes in file.
  * We may have to extend the file.
  */
-int cont_write_begin_newtrunc(struct file *file, struct address_space *mapping,
+int cont_write_begin(struct file *file, struct address_space *mapping,
                         loff_t pos, unsigned len, unsigned flags,
                         struct page **pagep, void **fsdata,
                         get_block_t *get_block, loff_t *bytes)
@@ -2363,7 +2319,7 @@ int cont_write_begin_newtrunc(struct file *file, struct address_space *mapping,
 
         err = cont_expand_zero(file, mapping, pos, bytes);
         if (err)
-                goto out;
+                return err;
 
         zerofrom = *bytes & ~PAGE_CACHE_MASK;
         if (pos+len > *bytes && zerofrom & (blocksize-1)) {
@@ -2371,44 +2327,10 @@ int cont_write_begin_newtrunc(struct file *file, struct address_space *mapping,
                 (*bytes)++;
         }
 
-        *pagep = NULL;
-        err = block_write_begin_newtrunc(file, mapping, pos, len,
-                                flags, pagep, fsdata, get_block);
-out:
-        return err;
-}
-EXPORT_SYMBOL(cont_write_begin_newtrunc);
-
-int cont_write_begin(struct file *file, struct address_space *mapping,
-                        loff_t pos, unsigned len, unsigned flags,
-                        struct page **pagep, void **fsdata,
-                        get_block_t *get_block, loff_t *bytes)
-{
-        int ret;
-
-        ret = cont_write_begin_newtrunc(file, mapping, pos, len, flags,
-                                        pagep, fsdata, get_block, bytes);
-        if (unlikely(ret)) {
-                loff_t isize = mapping->host->i_size;
-                if (pos + len > isize)
-                        vmtruncate(mapping->host, isize);
-        }
-
-        return ret;
+        return block_write_begin(mapping, pos, len, flags, pagep, get_block);
 }
 EXPORT_SYMBOL(cont_write_begin);
 
-int block_prepare_write(struct page *page, unsigned from, unsigned to,
-                        get_block_t *get_block)
-{
-        struct inode *inode = page->mapping->host;
-        int err = __block_prepare_write(inode, page, from, to, get_block);
-        if (err)
-                ClearPageUptodate(page);
-        return err;
-}
-EXPORT_SYMBOL(block_prepare_write);
-
 int block_commit_write(struct page *page, unsigned from, unsigned to)
 {
         struct inode *inode = page->mapping->host;
@@ -2510,11 +2432,11 @@ static void attach_nobh_buffers(struct page *page, struct buffer_head *head)
 }
 
 /*
- * Filesystems implementing the new truncate sequence should use the
- * _newtrunc postfix variant which won't incorrectly call vmtruncate.
+ * On entry, the page is fully not uptodate.
+ * On exit the page is fully uptodate in the areas outside (from,to)
  * The filesystem needs to handle block truncation upon failure.
  */
-int nobh_write_begin_newtrunc(struct file *file, struct address_space *mapping,
+int nobh_write_begin(struct address_space *mapping,
                         loff_t pos, unsigned len, unsigned flags,
                         struct page **pagep, void **fsdata,
                         get_block_t *get_block)
@@ -2547,8 +2469,8 @@ int nobh_write_begin_newtrunc(struct file *file, struct address_space *mapping,
                 unlock_page(page);
                 page_cache_release(page);
                 *pagep = NULL;
-                return block_write_begin_newtrunc(file, mapping, pos, len,
-                                        flags, pagep, fsdata, get_block);
+                return block_write_begin(mapping, pos, len, flags, pagep,
+                                         get_block);
         }
 
         if (PageMappedToDisk(page))
@@ -2654,35 +2576,6 @@ out_release:
 
         return ret;
 }
-EXPORT_SYMBOL(nobh_write_begin_newtrunc);
-
-/*
- * On entry, the page is fully not uptodate.
- * On exit the page is fully uptodate in the areas outside (from,to)
- */
-int nobh_write_begin(struct file *file, struct address_space *mapping,
-                        loff_t pos, unsigned len, unsigned flags,
-                        struct page **pagep, void **fsdata,
-                        get_block_t *get_block)
-{
-        int ret;
-
-        ret = nobh_write_begin_newtrunc(file, mapping, pos, len, flags,
-                                        pagep, fsdata, get_block);
-
-        /*
-         * prepare_write() may have instantiated a few blocks
-         * outside i_size.  Trim these off again. Don't need
-         * i_size_read because we hold i_mutex.
-         */
-        if (unlikely(ret)) {
-                loff_t isize = mapping->host->i_size;
-                if (pos + len > isize)
-                        vmtruncate(mapping->host, isize);
-        }
-
-        return ret;
-}
 EXPORT_SYMBOL(nobh_write_begin);
 
 int nobh_write_end(struct file *file, struct address_space *mapping,
@@ -3020,13 +2913,6 @@ int submit_bh(int rw, struct buffer_head * bh)
         BUG_ON(buffer_unwritten(bh));
 
         /*
-         * Mask in barrier bit for a write (could be either a WRITE or a
-         * WRITE_SYNC
-         */
-        if (buffer_ordered(bh) && (rw & WRITE))
-                rw |= WRITE_BARRIER;
-
-        /*
          * Only clear out a write error when rewriting
          */
         if (test_set_buffer_req(bh) && (rw & WRITE))
@@ -3064,22 +2950,21 @@ EXPORT_SYMBOL(submit_bh);
 
 /**
  * ll_rw_block: low-level access to block devices (DEPRECATED)
- * @rw: whether to %READ or %WRITE or %SWRITE or maybe %READA (readahead)
+ * @rw: whether to %READ or %WRITE or maybe %READA (readahead)
  * @nr: number of &struct buffer_heads in the array
  * @bhs: array of pointers to &struct buffer_head
  *
  * ll_rw_block() takes an array of pointers to &struct buffer_heads, and
  * requests an I/O operation on them, either a %READ or a %WRITE.  The third
- * %SWRITE is like %WRITE only we make sure that the *current* data in buffers
- * are sent to disk. The fourth %READA option is described in the documentation
- * for generic_make_request() which ll_rw_block() calls.
+ * %READA option is described in the documentation for generic_make_request()
+ * which ll_rw_block() calls.
  *
  * This function drops any buffer that it cannot get a lock on (with the
- * BH_Lock state bit) unless SWRITE is required, any buffer that appears to be
- * clean when doing a write request, and any buffer that appears to be
- * up-to-date when doing read request.  Further it marks as clean buffers that
- * are processed for writing (the buffer cache won't assume that they are
- * actually clean until the buffer gets unlocked).
+ * BH_Lock state bit), any buffer that appears to be clean when doing a write
+ * request, and any buffer that appears to be up-to-date when doing read
+ * request.  Further it marks as clean buffers that are processed for
+ * writing (the buffer cache won't assume that they are actually clean
+ * until the buffer gets unlocked).
  *
  * ll_rw_block sets b_end_io to simple completion handler that marks
  * the buffer up-to-date (if approriate), unlocks the buffer and wakes
@@ -3095,20 +2980,13 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
         for (i = 0; i < nr; i++) {
                 struct buffer_head *bh = bhs[i];
 
-                if (rw == SWRITE || rw == SWRITE_SYNC || rw == SWRITE_SYNC_PLUG)
-                        lock_buffer(bh);
-                else if (!trylock_buffer(bh))
+                if (!trylock_buffer(bh))
                         continue;
-
-                if (rw == WRITE || rw == SWRITE || rw == SWRITE_SYNC ||
-                    rw == SWRITE_SYNC_PLUG) {
+                if (rw == WRITE) {
                         if (test_clear_buffer_dirty(bh)) {
                                 bh->b_end_io = end_buffer_write_sync;
                                 get_bh(bh);
-                                if (rw == SWRITE_SYNC)
-                                        submit_bh(WRITE_SYNC, bh);
-                                else
-                                        submit_bh(WRITE, bh);
+                                submit_bh(WRITE, bh);
                                 continue;
                         }
                 } else {
@@ -3124,12 +3002,25 @@ void ll_rw_block(int rw, int nr, struct buffer_head *bhs[])
 }
 EXPORT_SYMBOL(ll_rw_block);
 
+void write_dirty_buffer(struct buffer_head *bh, int rw)
+{
+        lock_buffer(bh);
+        if (!test_clear_buffer_dirty(bh)) {
+                unlock_buffer(bh);
+                return;
+        }
+        bh->b_end_io = end_buffer_write_sync;
+        get_bh(bh);
+        submit_bh(rw, bh);
+}
+EXPORT_SYMBOL(write_dirty_buffer);
+
 /*
  * For a data-integrity writeout, we need to wait upon any in-progress I/O
  * and then start new I/O and then wait upon it.  The caller must have a ref on
  * the buffer_head.
  */
-int sync_dirty_buffer(struct buffer_head *bh)
+int __sync_dirty_buffer(struct buffer_head *bh, int rw)
 {
         int ret = 0;
 
@@ -3138,7 +3029,7 @@ int sync_dirty_buffer(struct buffer_head *bh)
         if (test_clear_buffer_dirty(bh)) {
                 get_bh(bh);
                 bh->b_end_io = end_buffer_write_sync;
-                ret = submit_bh(WRITE_SYNC, bh);
+                ret = submit_bh(rw, bh);
                 wait_on_buffer(bh);
                 if (buffer_eopnotsupp(bh)) {
                         clear_buffer_eopnotsupp(bh);
@@ -3151,6 +3042,12 @@ int sync_dirty_buffer(struct buffer_head *bh)
         }
         return ret;
 }
+EXPORT_SYMBOL(__sync_dirty_buffer);
+
+int sync_dirty_buffer(struct buffer_head *bh)
+{
+        return __sync_dirty_buffer(bh, WRITE_SYNC);
+}
 EXPORT_SYMBOL(sync_dirty_buffer);
 
 /*