Merge ../torvalds-2.6/

[pandora-kernel.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index c11418d..b534657 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -37,6 +37,10 @@
 #include <asm/uaccess.h>
 #include <asm/mman.h>
 
+static ssize_t
+generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
+       loff_t offset, unsigned long nr_segs);
+
 /*
  * Shared mappings implemented 30.11.1994. It's not fully working yet,
  * though.
@@ -54,9 +58,8 @@
  *
  *  ->i_mmap_lock              (vmtruncate)
  *    ->private_lock           (__free_pte->__set_page_dirty_buffers)
- *      ->swap_list_lock
- *        ->swap_device_lock   (exclusive_swap_page, others)
- *          ->mapping->tree_lock
+ *      ->swap_lock            (exclusive_swap_page, others)
+ *        ->mapping->tree_lock
  *
  *  ->i_sem
  *    ->i_mmap_lock            (truncate->unmap_mapping_range)
@@ -86,7 +89,7 @@
  *    ->page_table_lock                (anon_vma_prepare and various)
  *
  *  ->page_table_lock
- *    ->swap_device_lock       (try_to_unmap_one)
+ *    ->swap_lock              (try_to_unmap_one)
  *    ->private_lock           (try_to_unmap_one)
  *    ->tree_lock              (try_to_unmap_one)
  *    ->zone.lru_lock          (follow_page->mark_page_accessed)
@@ -302,8 +305,9 @@ EXPORT_SYMBOL(sync_page_range);
  * as it forces O_SYNC writers to different parts of the same file
  * to be serialised right until io completion.
  */
-int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
-                       loff_t pos, size_t count)
+static int sync_page_range_nolock(struct inode *inode,
+                                 struct address_space *mapping,
+                                 loff_t pos, size_t count)
 {
        pgoff_t start = pos >> PAGE_CACHE_SHIFT;
        pgoff_t end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
@@ -318,7 +322,6 @@ int sync_page_range_nolock(struct inode *inode, struct address_space *mapping,
                ret = wait_on_page_writeback_range(mapping, start, end);
        return ret;
 }
-EXPORT_SYMBOL(sync_page_range_nolock);
 
 /**
  * filemap_fdatawait - walk the list of under-writeback pages of the given
@@ -1505,8 +1508,12 @@ repeat:
                return -EINVAL;
 
        page = filemap_getpage(file, pgoff, nonblock);
+
+       /* XXX: This is wrong, a filesystem I/O error may have happened. Fix that as
+        * done in shmem_populate calling shmem_getpage */
        if (!page && !nonblock)
                return -ENOMEM;
+
        if (page) {
                err = install_page(mm, vma, addr, page, prot);
                if (err) {
@@ -1514,6 +1521,9 @@ repeat:
                        return err;
                }
        } else {
+               /* No page was found just because we can't read it in now (being
+                * here implies nonblock != 0), but the page may exist, so set
+                * the PTE to fault it in later. */
                err = install_file_pte(mm, vma, addr, pgoff, prot);
                if (err)
                        return err;
@@ -2002,7 +2012,7 @@ generic_file_buffered_write(struct kiocb *iocb, const struct iovec *iov,
 }
 EXPORT_SYMBOL(generic_file_buffered_write);
 
-ssize_t
+static ssize_t
 __generic_file_aio_write_nolock(struct kiocb *iocb, const struct iovec *iov,
                                unsigned long nr_segs, loff_t *ppos)
 {
@@ -2102,7 +2112,7 @@ generic_file_aio_write_nolock(struct kiocb *iocb, const struct iovec *iov,
        return ret;
 }
 
-ssize_t
+static ssize_t
 __generic_file_write_nolock(struct file *file, const struct iovec *iov,
                                unsigned long nr_segs, loff_t *ppos)
 {
@@ -2223,7 +2233,7 @@ EXPORT_SYMBOL(generic_file_writev);
  * Called under i_sem for writes to S_ISREG files.   Returns -EIO if something
  * went wrong during pagecache shootdown.
  */
-ssize_t
+static ssize_t
 generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
        loff_t offset, unsigned long nr_segs)
 {
@@ -2258,4 +2268,3 @@ generic_file_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov,
        }
        return retval;
 }
-EXPORT_SYMBOL_GPL(generic_file_direct_IO);