#include <linux/blkdev.h>
#include <linux/security.h>
#include <linux/syscalls.h>
+#include "filemap.h"
/*
- * This is needed for the following functions:
- * - try_to_release_page
- * - block_invalidatepage
- * - generic_osync_inode
- *
* FIXME: remove all knowledge of the buffer layer from the core VM
*/
#include <linux/buffer_head.h> /* for generic_osync_inode */
{
struct address_space *mapping = page->mapping;
- if (unlikely(!PageLocked(page)))
- PAGE_BUG(page);
+ BUG_ON(!PageLocked(page));
write_lock_irq(&mapping->tree_lock);
__remove_from_page_cache(page);
/**
* filemap_fdatawrite_range - start writeback against all of a mapping's
* dirty pages that lie within the byte offsets <start, end>
- * @mapping: address space structure to write
- * @start: offset in bytes where the range starts
- * @end : offset in bytes where the range ends
+ * @mapping: address space structure to write
+ * @start: offset in bytes where the range starts
+ * @end: offset in bytes where the range ends
+ * @sync_mode: enable synchronous operation
*
* If sync_mode is WB_SYNC_ALL then this is a "data integrity" operation, as
* opposed to a regular memory * cleansing writeback. The difference between
/**
* find_lock_page - locate, pin and lock a pagecache page
*
- * @mapping - the address_space to search
- * @offset - the page index
+ * @mapping: the address_space to search
+ * @offset: the page index
*
* Locates the desired pagecache page, locks it, increments its reference
* count and returns its address.
/**
* find_or_create_page - locate or add a pagecache page
*
- * @mapping - the page's address_space
- * @index - the page's index into the mapping
- * @gfp_mask - page allocation mode
+ * @mapping: the page's address_space
+ * @index: the page's index into the mapping
+ * @gfp_mask: page allocation mode
*
* Locates a page in the pagecache. If the page is not present, a new page
* is allocated using @gfp_mask and is added to the pagecache and to the VM's
if (pos < size) {
retval = generic_file_direct_IO(READ, iocb,
iov, pos, nr_segs);
- if (retval >= 0 && !is_sync_kiocb(iocb))
+ if (retval > 0 && !is_sync_kiocb(iocb))
retval = -EIOCBQUEUED;
if (retval > 0)
*ppos = pos + retval;
}
EXPORT_SYMBOL(remove_suid);
-/*
- * Copy as much as we can into the page and return the number of bytes which
- * were sucessfully copied. If a fault is encountered then clear the page
- * out to (offset+bytes) and return the number of bytes which were copied.
- */
-static inline size_t
-filemap_copy_from_user(struct page *page, unsigned long offset,
- const char __user *buf, unsigned bytes)
-{
- char *kaddr;
- int left;
-
- kaddr = kmap_atomic(page, KM_USER0);
- left = __copy_from_user_inatomic(kaddr + offset, buf, bytes);
- kunmap_atomic(kaddr, KM_USER0);
-
- if (left != 0) {
- /* Do it the slow way */
- kaddr = kmap(page);
- left = __copy_from_user(kaddr + offset, buf, bytes);
- kunmap(page);
- }
- return bytes - left;
-}
-
-static size_t
+size_t
__filemap_copy_from_user_iovec(char *vaddr,
const struct iovec *iov, size_t base, size_t bytes)
{
return copied - left;
}
-/*
- * This has the same sideeffects and return value as filemap_copy_from_user().
- * The difference is that on a fault we need to memset the remainder of the
- * page (out to offset+bytes), to emulate filemap_copy_from_user()'s
- * single-segment behaviour.
- */
-static inline size_t
-filemap_copy_from_user_iovec(struct page *page, unsigned long offset,
- const struct iovec *iov, size_t base, size_t bytes)
-{
- char *kaddr;
- size_t copied;
-
- kaddr = kmap_atomic(page, KM_USER0);
- copied = __filemap_copy_from_user_iovec(kaddr + offset, iov,
- base, bytes);
- kunmap_atomic(kaddr, KM_USER0);
- if (copied != bytes) {
- kaddr = kmap(page);
- copied = __filemap_copy_from_user_iovec(kaddr + offset, iov,
- base, bytes);
- kunmap(page);
- }
- return copied;
-}
-
-static inline void
-filemap_set_next_iovec(const struct iovec **iovp, size_t *basep, size_t bytes)
-{
- const struct iovec *iov = *iovp;
- size_t base = *basep;
-
- while (bytes) {
- int copy = min(bytes, iov->iov_len - base);
-
- bytes -= copy;
- base += copy;
- if (iov->iov_len == base) {
- iov++;
- base = 0;
- }
- }
- *iovp = iov;
- *basep = base;
-}
-
/*
* Performs necessary checks before doing a write
*
if (unlikely(*pos < 0))
return -EINVAL;
- if (unlikely(file->f_error)) {
- int err = file->f_error;
- file->f_error = 0;
- return err;
- }
-
if (!isblk) {
/* FIXME: this is for backwards compatibility with 2.4 */
if (file->f_flags & O_APPEND)
* i_sem is held, which protects generic_osync_inode() from
* livelocking.
*/
- if (written >= 0 && file->f_flags & O_SYNC)
- generic_osync_inode(inode, mapping, OSYNC_METADATA);
+ if (written >= 0 && ((file->f_flags & O_SYNC) || IS_SYNC(inode))) {
+ int err = generic_osync_inode(inode, mapping, OSYNC_METADATA);
+ if (err < 0)
+ written = err;
+ }
if (written == count && !is_sync_kiocb(iocb))
written = -EIOCBQUEUED;
return written;
do {
unsigned long index;
unsigned long offset;
+ unsigned long maxlen;
size_t copied;
offset = (pos & (PAGE_CACHE_SIZE -1)); /* Within page */
* same page as we're writing to, without it being marked
* up-to-date.
*/
- fault_in_pages_readable(buf, bytes);
+ maxlen = cur_iov->iov_len - iov_base;
+ if (maxlen > bytes)
+ maxlen = bytes;
+ fault_in_pages_readable(buf, maxlen);
page = __grab_cache_page(mapping,index,&cached_page,&lru_pvec);
if (!page) {
if (unlikely(nr_segs > 1)) {
filemap_set_next_iovec(&cur_iov,
&iov_base, status);
- buf = cur_iov->iov_base + iov_base;
+ if (count)
+ buf = cur_iov->iov_base +
+ iov_base;
+ } else {
+ iov_base += status;
}
}
}
projects / linux-2.6 / blobdiff