NFS: Remove BKL requirement from attribute updates

[safe/jmp/linux-2.6] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index b7b1be6..1e6a7d3 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -28,7 +28,6 @@
 #include <linux/backing-dev.h>
 #include <linux/pagevec.h>
 #include <linux/blkdev.h>
-#include <linux/backing-dev.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>
 #include <linux/cpuset.h>
@@ -344,7 +343,7 @@ int sync_page_range(struct inode *inode, struct address_space *mapping,
 EXPORT_SYMBOL(sync_page_range);
 
 /**
- * sync_page_range_nolock
+ * sync_page_range_nolock - write & wait on all pages in the passed range without locking
  * @inode:     target inode
  * @mapping:   target address_space
  * @pos:       beginning offset in pages to write
@@ -577,10 +576,12 @@ EXPORT_SYMBOL(unlock_page);
  */
 void end_page_writeback(struct page *page)
 {
-       if (!TestClearPageReclaim(page) || rotate_reclaimable_page(page)) {
-               if (!test_clear_page_writeback(page))
-                       BUG();
-       }
+       if (TestClearPageReclaim(page))
+               rotate_reclaimable_page(page);
+
+       if (!test_clear_page_writeback(page))
+               BUG();
+
        smp_mb__after_clear_bit();
        wake_up_page(page, PG_writeback);
 }
@@ -604,7 +605,7 @@ void __lock_page(struct page *page)
 }
 EXPORT_SYMBOL(__lock_page);
 
-int fastcall __lock_page_killable(struct page *page)
+int __lock_page_killable(struct page *page)
 {
        DEFINE_WAIT_BIT(wait, &page->flags, PG_locked);
 
@@ -612,7 +613,10 @@ int fastcall __lock_page_killable(struct page *page)
                                        sync_page_killable, TASK_KILLABLE);
 }
 
-/*
+/**
+ * __lock_page_nosync - get a lock on the page, without calling sync_page()
+ * @page: the page to lock
+ *
  * Variant of lock_page that does not require the caller to hold a reference
  * on the page's mapping.
  */
@@ -1457,6 +1461,11 @@ page_not_uptodate:
         */
        ClearPageError(page);
        error = mapping->a_ops->readpage(file, page);
+       if (!error) {
+               wait_on_page_locked(page);
+               if (!PageUptodate(page))
+                       error = -EIO;
+       }
        page_cache_release(page);
 
        if (!error || error == AOP_TRUNCATED_PAGE)
@@ -1539,9 +1548,20 @@ repeat:
        return page;
 }
 
-/*
+/**
+ * read_cache_page_async - read into page cache, fill it if needed
+ * @mapping:   the page's address_space
+ * @index:     the page index
+ * @filler:    function to perform the read
+ * @data:      destination for read data
+ *
  * Same as read_cache_page, but don't wait for page to become unlocked
  * after submitting it to the filler.
+ *
+ * Read into the page cache. If a page already exists, and PageUptodate() is
+ * not set, try to fill the page but don't wait for it to become unlocked.
+ *
+ * If the page does not get brought uptodate, return -EIO.
  */
 struct page *read_cache_page_async(struct address_space *mapping,
                                pgoff_t index,
@@ -1640,7 +1660,7 @@ int should_remove_suid(struct dentry *dentry)
 }
 EXPORT_SYMBOL(should_remove_suid);
 
-int __remove_suid(struct dentry *dentry, int kill)
+static int __remove_suid(struct dentry *dentry, int kill)
 {
        struct iattr newattrs;
 
@@ -1743,21 +1763,27 @@ size_t iov_iter_copy_from_user(struct page *page,
 }
 EXPORT_SYMBOL(iov_iter_copy_from_user);
 
-static void __iov_iter_advance_iov(struct iov_iter *i, size_t bytes)
+void iov_iter_advance(struct iov_iter *i, size_t bytes)
 {
+       BUG_ON(i->count < bytes);
+
        if (likely(i->nr_segs == 1)) {
                i->iov_offset += bytes;
+               i->count -= bytes;
        } else {
                const struct iovec *iov = i->iov;
                size_t base = i->iov_offset;
 
                /*
                 * The !iov->iov_len check ensures we skip over unlikely
-                * zero-length segments.
+                * zero-length segments (without overruning the iovec).
                 */
-               while (bytes || !iov->iov_len) {
-                       int copy = min(bytes, iov->iov_len - base);
+               while (bytes || unlikely(!iov->iov_len && i->count)) {
+                       int copy;
 
+                       copy = min(bytes, iov->iov_len - base);
+                       BUG_ON(!i->count || i->count < copy);
+                       i->count -= copy;
                        bytes -= copy;
                        base += copy;
                        if (iov->iov_len == base) {
@@ -1769,14 +1795,6 @@ static void __iov_iter_advance_iov(struct iov_iter *i, size_t bytes)
                i->iov_offset = base;
        }
 }
-
-void iov_iter_advance(struct iov_iter *i, size_t bytes)
-{
-       BUG_ON(i->count < bytes);
-
-       __iov_iter_advance_iov(i, bytes);
-       i->count -= bytes;
-}
 EXPORT_SYMBOL(iov_iter_advance);
 
 /*