return 0;
}
-void fastcall __lock_buffer(struct buffer_head *bh)
+void __lock_buffer(struct buffer_head *bh)
{
wait_on_bit_lock(&bh->b_state, BH_Lock, sync_buffer,
TASK_UNINTERRUPTIBLE);
}
EXPORT_SYMBOL(__lock_buffer);
-void fastcall unlock_buffer(struct buffer_head *bh)
+void unlock_buffer(struct buffer_head *bh)
{
smp_mb__before_clear_bit();
clear_buffer_locked(bh);
*/
static void free_more_memory(void)
{
- struct zone **zones;
- pg_data_t *pgdat;
+ struct zone *zone;
+ int nid;
wakeup_pdflush(1024);
yield();
- for_each_online_pgdat(pgdat) {
- zones = pgdat->node_zonelists[gfp_zone(GFP_NOFS)].zones;
- if (*zones)
- try_to_free_pages(zones, 0, GFP_NOFS);
+ for_each_online_node(nid) {
+ (void)first_zones_zonelist(node_zonelist(nid, GFP_NOFS),
+ gfp_zone(GFP_NOFS), NULL,
+ &zone);
+ if (zone)
+ try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0,
+ GFP_NOFS);
}
}
}
/**
- * sync_mapping_buffers - write out and wait upon a mapping's "associated"
- * buffers
+ * sync_mapping_buffers - write out & wait upon a mapping's "associated" buffers
* @mapping: the mapping which wants those buffers written
*
* Starts I/O against the buffers at mapping->private_list, and waits upon
} else {
BUG_ON(mapping->assoc_mapping != buffer_mapping);
}
- if (list_empty(&bh->b_assoc_buffers)) {
+ if (!bh->b_assoc_map) {
spin_lock(&buffer_mapping->private_lock);
list_move_tail(&bh->b_assoc_buffers,
&mapping->private_list);
{
struct buffer_head *bh;
struct list_head tmp;
+ struct address_space *mapping;
int err = 0, err2;
INIT_LIST_HEAD(&tmp);
spin_lock(lock);
while (!list_empty(list)) {
bh = BH_ENTRY(list->next);
+ mapping = bh->b_assoc_map;
__remove_assoc_queue(bh);
+ /* Avoid race with mark_buffer_dirty_inode() which does
+ * a lockless check and we rely on seeing the dirty bit */
+ smp_mb();
if (buffer_dirty(bh) || buffer_locked(bh)) {
list_add(&bh->b_assoc_buffers, &tmp);
+ bh->b_assoc_map = mapping;
if (buffer_dirty(bh)) {
get_bh(bh);
spin_unlock(lock);
while (!list_empty(&tmp)) {
bh = BH_ENTRY(tmp.prev);
- list_del_init(&bh->b_assoc_buffers);
get_bh(bh);
+ mapping = bh->b_assoc_map;
+ __remove_assoc_queue(bh);
+ /* Avoid race with mark_buffer_dirty_inode() which does
+ * a lockless check and we rely on seeing the dirty bit */
+ smp_mb();
+ if (buffer_dirty(bh)) {
+ list_add(&bh->b_assoc_buffers,
+ &mapping->private_list);
+ bh->b_assoc_map = mapping;
+ }
spin_unlock(lock);
wait_on_buffer(bh);
if (!buffer_uptodate(bh))
* mark_buffer_dirty() is atomic. It takes bh->b_page->mapping->private_lock,
* mapping->tree_lock and the global inode_lock.
*/
-void fastcall mark_buffer_dirty(struct buffer_head *bh)
+void mark_buffer_dirty(struct buffer_head *bh)
{
WARN_ON_ONCE(!buffer_uptodate(bh));
- if (!buffer_dirty(bh) && !test_set_buffer_dirty(bh))
+
+ /*
+ * Very *carefully* optimize the it-is-already-dirty case.
+ *
+ * Don't let the final "is it dirty" escape to before we
+ * perhaps modified the buffer.
+ */
+ if (buffer_dirty(bh)) {
+ smp_mb();
+ if (buffer_dirty(bh))
+ return;
+ }
+
+ if (!test_set_buffer_dirty(bh))
__set_page_dirty(bh->b_page, page_mapping(bh->b_page), 0);
}
void __bforget(struct buffer_head *bh)
{
clear_buffer_dirty(bh);
- if (!list_empty(&bh->b_assoc_buffers)) {
+ if (bh->b_assoc_map) {
struct address_space *buffer_mapping = bh->b_page->mapping;
spin_lock(&buffer_mapping->private_lock);
{
on_each_cpu(invalidate_bh_lru, NULL, 1, 1);
}
+EXPORT_SYMBOL_GPL(invalidate_bh_lrus);
void set_bh_page(struct buffer_head *bh,
struct page *page, unsigned long offset)
* The page and buffer_heads can be released at any time from
* here on.
*/
- wbc->pages_skipped++; /* We didn't write this page */
}
return err;
start = max(from, block_start);
size = min(to, block_end) - start;
- zero_user_page(page, start, size, KM_USER0);
+ zero_user(page, start, size);
set_buffer_uptodate(bh);
}
mark_buffer_dirty(bh);
continue;
}
- if (block_end > to || block_start < from) {
- void *kaddr;
-
- kaddr = kmap_atomic(page, KM_USER0);
- if (block_end > to)
- memset(kaddr+to, 0,
- block_end-to);
- if (block_start < from)
- memset(kaddr+block_start,
- 0, from-block_start);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
- }
+ if (block_end > to || block_start < from)
+ zero_user_segments(page,
+ to, block_end,
+ block_start, from);
continue;
}
}
SetPageError(page);
}
if (!buffer_mapped(bh)) {
- zero_user_page(page, i * blocksize, blocksize,
- KM_USER0);
+ zero_user(page, i * blocksize, blocksize);
if (!err)
set_buffer_uptodate(bh);
continue;
return err;
}
-int cont_expand_zero(struct file *file, struct address_space *mapping,
- loff_t pos, loff_t *bytes)
+static int cont_expand_zero(struct file *file, struct address_space *mapping,
+ loff_t pos, loff_t *bytes)
{
struct inode *inode = mapping->host;
unsigned blocksize = 1 << inode->i_blkbits;
&page, &fsdata);
if (err)
goto out;
- zero_user_page(page, zerofrom, len, KM_USER0);
+ zero_user(page, zerofrom, len);
err = pagecache_write_end(file, mapping, curpos, len, len,
page, fsdata);
if (err < 0)
goto out;
BUG_ON(err != len);
err = 0;
+
+ balance_dirty_pages_ratelimited(mapping);
}
/* page covers the boundary, find the boundary offset */
&page, &fsdata);
if (err)
goto out;
- zero_user_page(page, zerofrom, len, KM_USER0);
+ zero_user(page, zerofrom, len);
err = pagecache_write_end(file, mapping, curpos, len, len,
page, fsdata);
if (err < 0)
return 0;
}
-int generic_commit_write(struct file *file, struct page *page,
- unsigned from, unsigned to)
-{
- struct inode *inode = page->mapping->host;
- loff_t pos = ((loff_t)page->index << PAGE_CACHE_SHIFT) + to;
- __block_commit_write(inode,page,from,to);
- /*
- * No need to use i_size_read() here, the i_size
- * cannot change under us because we hold i_mutex.
- */
- if (pos > inode->i_size) {
- i_size_write(inode, pos);
- mark_inode_dirty(inode);
- }
- return 0;
-}
-
/*
* block_page_mkwrite() is not allowed to change the file size as it gets
* called from a page fault handler when a page is first dirtied. Hence we must
unsigned block_in_page;
unsigned block_start, block_end;
sector_t block_in_file;
- char *kaddr;
int nr_reads = 0;
int ret = 0;
int is_mapped_to_disk = 1;
continue;
}
if (buffer_new(bh) || !buffer_mapped(bh)) {
- kaddr = kmap_atomic(page, KM_USER0);
- if (block_start < from)
- memset(kaddr+block_start, 0, from-block_start);
- if (block_end > to)
- memset(kaddr + to, 0, block_end - to);
- flush_dcache_page(page);
- kunmap_atomic(kaddr, KM_USER0);
+ zero_user_segments(page, block_start, from,
+ to, block_end);
continue;
}
if (buffer_uptodate(bh))
struct page *page, void *fsdata)
{
struct inode *inode = page->mapping->host;
- struct buffer_head *head = NULL;
+ struct buffer_head *head = fsdata;
struct buffer_head *bh;
+ BUG_ON(fsdata != NULL && page_has_buffers(page));
- if (!PageMappedToDisk(page)) {
- if (unlikely(copied < len) && !page_has_buffers(page))
- attach_nobh_buffers(page, head);
- if (page_has_buffers(page))
- return generic_write_end(file, mapping, pos, len,
- copied, page, fsdata);
- }
+ if (unlikely(copied < len) && !page_has_buffers(page))
+ attach_nobh_buffers(page, head);
+ if (page_has_buffers(page))
+ return generic_write_end(file, mapping, pos, len,
+ copied, page, fsdata);
SetPageUptodate(page);
set_page_dirty(page);
unlock_page(page);
page_cache_release(page);
- head = fsdata;
while (head) {
bh = head;
head = head->b_this_page;
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- zero_user_page(page, offset, PAGE_CACHE_SIZE - offset, KM_USER0);
+ zero_user_segment(page, offset, PAGE_CACHE_SIZE);
out:
ret = mpage_writepage(page, get_block, wbc);
if (ret == -EAGAIN)
if (page_has_buffers(page))
goto has_buffers;
}
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
set_page_dirty(page);
err = 0;
goto unlock;
}
- zero_user_page(page, offset, length, KM_USER0);
+ zero_user(page, offset, length);
mark_buffer_dirty(bh);
err = 0;
* the page size, the remaining memory is zeroed when mapped, and
* writes to that region are not written out to the file."
*/
- zero_user_page(page, offset, PAGE_CACHE_SIZE - offset, KM_USER0);
+ zero_user_segment(page, offset, PAGE_CACHE_SIZE);
return __block_write_full_page(inode, page, get_block, wbc);
}
do {
struct buffer_head *next = bh->b_this_page;
- if (!list_empty(&bh->b_assoc_buffers))
+ if (bh->b_assoc_map)
__remove_assoc_queue(bh);
bh = next;
} while (bh != head);
struct buffer_head *alloc_buffer_head(gfp_t gfp_flags)
{
- struct buffer_head *ret = kmem_cache_zalloc(bh_cachep,
- set_migrateflags(gfp_flags, __GFP_RECLAIMABLE));
+ struct buffer_head *ret = kmem_cache_alloc(bh_cachep, gfp_flags);
if (ret) {
INIT_LIST_HEAD(&ret->b_assoc_buffers);
get_cpu_var(bh_accounting).nr++;
return NOTIFY_OK;
}
+/**
+ * bh_uptodate_or_lock - Test whether the buffer is uptodate
+ * @bh: struct buffer_head
+ *
+ * Return true if the buffer is up-to-date and false,
+ * with the buffer locked, if not.
+ */
+int bh_uptodate_or_lock(struct buffer_head *bh)
+{
+ if (!buffer_uptodate(bh)) {
+ lock_buffer(bh);
+ if (!buffer_uptodate(bh))
+ return 0;
+ unlock_buffer(bh);
+ }
+ return 1;
+}
+EXPORT_SYMBOL(bh_uptodate_or_lock);
+
+/**
+ * bh_submit_read - Submit a locked buffer for reading
+ * @bh: struct buffer_head
+ *
+ * Returns zero on success and -EIO on error.
+ */
+int bh_submit_read(struct buffer_head *bh)
+{
+ BUG_ON(!buffer_locked(bh));
+
+ if (buffer_uptodate(bh)) {
+ unlock_buffer(bh);
+ return 0;
+ }
+
+ get_bh(bh);
+ bh->b_end_io = end_buffer_read_sync;
+ submit_bh(READ, bh);
+ wait_on_buffer(bh);
+ if (buffer_uptodate(bh))
+ return 0;
+ return -EIO;
+}
+EXPORT_SYMBOL(bh_submit_read);
+
+static void
+init_buffer_head(struct kmem_cache *cachep, void *data)
+{
+ struct buffer_head *bh = data;
+
+ memset(bh, 0, sizeof(*bh));
+ INIT_LIST_HEAD(&bh->b_assoc_buffers);
+}
+
void __init buffer_init(void)
{
int nrpages;
- bh_cachep = KMEM_CACHE(buffer_head,
- SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|SLAB_MEM_SPREAD);
+ bh_cachep = kmem_cache_create("buffer_head",
+ sizeof(struct buffer_head), 0,
+ (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC|
+ SLAB_MEM_SPREAD),
+ init_buffer_head);
/*
* Limit the bh occupancy to 10% of ZONE_NORMAL
EXPORT_SYMBOL(file_fsync);
EXPORT_SYMBOL(fsync_bdev);
EXPORT_SYMBOL(generic_block_bmap);
-EXPORT_SYMBOL(generic_commit_write);
EXPORT_SYMBOL(generic_cont_expand_simple);
EXPORT_SYMBOL(init_buffer);
EXPORT_SYMBOL(invalidate_bdev);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff