knfsd: exportfs: add exportfs.h header

[linux-2.6-omap-h63xx.git] / mm / filemap.c

diff --git a/mm/filemap.c b/mm/filemap.c
index 7b48b2ad00e773853780c1dbc314b850307199cb..5d5449f3d41c83810e002d7fc41cf0cb55b88536 100644 (file)
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -120,6 +120,7 @@ void __remove_from_page_cache(struct page *page)
        page->mapping = NULL;
        mapping->nrpages--;
        __dec_zone_page_state(page, NR_FILE_PAGES);
+       BUG_ON(page_mapped(page));
 }
 
 void remove_from_page_cache(struct page *page)
@@ -670,7 +671,8 @@ repeat:
        page = find_lock_page(mapping, index);
        if (!page) {
                if (!cached_page) {
-                       cached_page = alloc_page(gfp_mask);
+                       cached_page =
+                               __page_cache_alloc(gfp_mask);
                        if (!cached_page)
                                return NULL;
                }
@@ -865,13 +867,11 @@ void do_generic_mapping_read(struct address_space *mapping,
 {
        struct inode *inode = mapping->host;
        unsigned long index;
-       unsigned long end_index;
        unsigned long offset;
        unsigned long last_index;
        unsigned long next_index;
        unsigned long prev_index;
        unsigned int prev_offset;
-       loff_t isize;
        struct page *cached_page;
        int error;
        struct file_ra_state ra = *_ra;
@@ -884,27 +884,12 @@ void do_generic_mapping_read(struct address_space *mapping,
        last_index = (*ppos + desc->count + PAGE_CACHE_SIZE-1) >> PAGE_CACHE_SHIFT;
        offset = *ppos & ~PAGE_CACHE_MASK;
 
-       isize = i_size_read(inode);
-       if (!isize)
-               goto out;
-
-       end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
        for (;;) {
                struct page *page;
+               unsigned long end_index;
+               loff_t isize;
                unsigned long nr, ret;
 
-               /* nr is the maximum number of bytes to copy from this page */
-               nr = PAGE_CACHE_SIZE;
-               if (index >= end_index) {
-                       if (index > end_index)
-                               goto out;
-                       nr = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
-                       if (nr <= offset) {
-                               goto out;
-                       }
-               }
-               nr = nr - offset;
-
                cond_resched();
                if (index == next_index)
                        next_index = page_cache_readahead(mapping, &ra, filp,
@@ -919,6 +904,32 @@ find_page:
                if (!PageUptodate(page))
                        goto page_not_up_to_date;
 page_ok:
+               /*
+                * i_size must be checked after we know the page is Uptodate.
+                *
+                * Checking i_size after the check allows us to calculate
+                * the correct value for "nr", which means the zero-filled
+                * part of the page is not copied back to userspace (unless
+                * another truncate extends the file - this is desired though).
+                */
+
+               isize = i_size_read(inode);
+               end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
+               if (unlikely(!isize || index > end_index)) {
+                       page_cache_release(page);
+                       goto out;
+               }
+
+               /* nr is the maximum number of bytes to copy from this page */
+               nr = PAGE_CACHE_SIZE;
+               if (index == end_index) {
+                       nr = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
+                       if (nr <= offset) {
+                               page_cache_release(page);
+                               goto out;
+                       }
+               }
+               nr = nr - offset;
 
                /* If users can be writing to this page using arbitrary
                 * virtual addresses, take care about potential aliasing
@@ -1005,31 +1016,6 @@ readpage:
                        unlock_page(page);
                }
 
-               /*
-                * i_size must be checked after we have done ->readpage.
-                *
-                * Checking i_size after the readpage allows us to calculate
-                * the correct value for "nr", which means the zero-filled
-                * part of the page is not copied back to userspace (unless
-                * another truncate extends the file - this is desired though).
-                */
-               isize = i_size_read(inode);
-               end_index = (isize - 1) >> PAGE_CACHE_SHIFT;
-               if (unlikely(!isize || index > end_index)) {
-                       page_cache_release(page);
-                       goto out;
-               }
-
-               /* nr is the maximum number of bytes to copy from this page */
-               nr = PAGE_CACHE_SIZE;
-               if (index == end_index) {
-                       nr = ((isize - 1) & ~PAGE_CACHE_MASK) + 1;
-                       if (nr <= offset) {
-                               page_cache_release(page);
-                               goto out;
-                       }
-               }
-               nr = nr - offset;
                goto page_ok;
 
 readpage_error:
@@ -1217,6 +1203,8 @@ generic_file_aio_read(struct kiocb *iocb, const struct iovec *iov,
                                retval = retval ?: desc.error;
                                break;
                        }
+                       if (desc.count > 0)
+                               break;
                }
        }
 out:
@@ -1244,26 +1232,6 @@ int file_send_actor(read_descriptor_t * desc, struct page *page, unsigned long o
        return written;
 }
 
-ssize_t generic_file_sendfile(struct file *in_file, loff_t *ppos,
-                        size_t count, read_actor_t actor, void *target)
-{
-       read_descriptor_t desc;
-
-       if (!count)
-               return 0;
-
-       desc.written = 0;
-       desc.count = count;
-       desc.arg.data = target;
-       desc.error = 0;
-
-       do_generic_file_read(in_file, ppos, &desc, actor);
-       if (desc.written)
-               return desc.written;
-       return desc.error;
-}
-EXPORT_SYMBOL(generic_file_sendfile);
-
 static ssize_t
 do_readahead(struct address_space *mapping, struct file *filp,
             unsigned long index, unsigned long nr)
@@ -1785,7 +1753,6 @@ retry:
        page = __read_cache_page(mapping, index, filler, data);
        if (IS_ERR(page))
                return page;
-       mark_page_accessed(page);
        if (PageUptodate(page))
                goto out;
 
@@ -1984,7 +1951,6 @@ inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count, i
        if (unlikely(*pos + *count > MAX_NON_LFS &&
                                !(file->f_flags & O_LARGEFILE))) {
                if (*pos >= MAX_NON_LFS) {
-                       send_sig(SIGXFSZ, current, 0);
                        return -EFBIG;
                }
                if (*count > MAX_NON_LFS - (unsigned long)*pos) {
@@ -2002,7 +1968,6 @@ inline int generic_write_checks(struct file *file, loff_t *pos, size_t *count, i
        if (likely(!isblk)) {
                if (unlikely(*pos >= inode->i_sb->s_maxbytes)) {
                        if (*count || *pos > inode->i_sb->s_maxbytes) {
-                               send_sig(SIGXFSZ, current, 0);
                                return -EFBIG;
                        }
                        /* zero-length writes at ->s_maxbytes are OK */