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authorAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
committerAndré Fabian Silva Delgado <emulatorman@parabola.nu>2016-01-20 14:01:31 -0300
commitb4b7ff4b08e691656c9d77c758fc355833128ac0 (patch)
tree82fcb00e6b918026dc9f2d1f05ed8eee83874cc0 /mm/filemap.c
parent35acfa0fc609f2a2cd95cef4a6a9c3a5c38f1778 (diff)
Linux-libre 4.4-gnupck-4.4-gnu
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c83
1 files changed, 61 insertions, 22 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 7bbc37290..8eaece8ae 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -331,23 +331,14 @@ int filemap_flush(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_flush);
-/**
- * filemap_fdatawait_range - wait for writeback to complete
- * @mapping: address space structure to wait for
- * @start_byte: offset in bytes where the range starts
- * @end_byte: offset in bytes where the range ends (inclusive)
- *
- * Walk the list of under-writeback pages of the given address space
- * in the given range and wait for all of them.
- */
-int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
- loff_t end_byte)
+static int __filemap_fdatawait_range(struct address_space *mapping,
+ loff_t start_byte, loff_t end_byte)
{
pgoff_t index = start_byte >> PAGE_CACHE_SHIFT;
pgoff_t end = end_byte >> PAGE_CACHE_SHIFT;
struct pagevec pvec;
int nr_pages;
- int ret2, ret = 0;
+ int ret = 0;
if (end_byte < start_byte)
goto out;
@@ -374,6 +365,29 @@ int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
cond_resched();
}
out:
+ return ret;
+}
+
+/**
+ * filemap_fdatawait_range - wait for writeback to complete
+ * @mapping: address space structure to wait for
+ * @start_byte: offset in bytes where the range starts
+ * @end_byte: offset in bytes where the range ends (inclusive)
+ *
+ * Walk the list of under-writeback pages of the given address space
+ * in the given range and wait for all of them. Check error status of
+ * the address space and return it.
+ *
+ * Since the error status of the address space is cleared by this function,
+ * callers are responsible for checking the return value and handling and/or
+ * reporting the error.
+ */
+int filemap_fdatawait_range(struct address_space *mapping, loff_t start_byte,
+ loff_t end_byte)
+{
+ int ret, ret2;
+
+ ret = __filemap_fdatawait_range(mapping, start_byte, end_byte);
ret2 = filemap_check_errors(mapping);
if (!ret)
ret = ret2;
@@ -383,11 +397,38 @@ out:
EXPORT_SYMBOL(filemap_fdatawait_range);
/**
+ * filemap_fdatawait_keep_errors - wait for writeback without clearing errors
+ * @mapping: address space structure to wait for
+ *
+ * Walk the list of under-writeback pages of the given address space
+ * and wait for all of them. Unlike filemap_fdatawait(), this function
+ * does not clear error status of the address space.
+ *
+ * Use this function if callers don't handle errors themselves. Expected
+ * call sites are system-wide / filesystem-wide data flushers: e.g. sync(2),
+ * fsfreeze(8)
+ */
+void filemap_fdatawait_keep_errors(struct address_space *mapping)
+{
+ loff_t i_size = i_size_read(mapping->host);
+
+ if (i_size == 0)
+ return;
+
+ __filemap_fdatawait_range(mapping, 0, i_size - 1);
+}
+
+/**
* filemap_fdatawait - wait for all under-writeback pages to complete
* @mapping: address space structure to wait for
*
* Walk the list of under-writeback pages of the given address space
- * and wait for all of them.
+ * and wait for all of them. Check error status of the address space
+ * and return it.
+ *
+ * Since the error status of the address space is cleared by this function,
+ * callers are responsible for checking the return value and handling and/or
+ * reporting the error.
*/
int filemap_fdatawait(struct address_space *mapping)
{
@@ -510,7 +551,7 @@ int replace_page_cache_page(struct page *old, struct page *new, gfp_t gfp_mask)
__inc_zone_page_state(new, NR_SHMEM);
spin_unlock_irqrestore(&mapping->tree_lock, flags);
mem_cgroup_end_page_stat(memcg);
- mem_cgroup_migrate(old, new, true);
+ mem_cgroup_replace_page(old, new);
radix_tree_preload_end();
if (freepage)
freepage(old);
@@ -1681,7 +1722,7 @@ no_cached_page:
goto out;
}
error = add_to_page_cache_lru(page, mapping, index,
- GFP_KERNEL & mapping_gfp_mask(mapping));
+ mapping_gfp_constraint(mapping, GFP_KERNEL));
if (error) {
page_cache_release(page);
if (error == -EEXIST) {
@@ -1783,7 +1824,7 @@ static int page_cache_read(struct file *file, pgoff_t offset)
return -ENOMEM;
ret = add_to_page_cache_lru(page, mapping, offset,
- GFP_KERNEL & mapping_gfp_mask(mapping));
+ mapping_gfp_constraint(mapping, GFP_KERNEL));
if (ret == 0)
ret = mapping->a_ops->readpage(file, page);
else if (ret == -EEXIST)
@@ -1807,7 +1848,6 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
struct file *file,
pgoff_t offset)
{
- unsigned long ra_pages;
struct address_space *mapping = file->f_mapping;
/* If we don't want any read-ahead, don't bother */
@@ -1836,10 +1876,9 @@ static void do_sync_mmap_readahead(struct vm_area_struct *vma,
/*
* mmap read-around
*/
- ra_pages = max_sane_readahead(ra->ra_pages);
- ra->start = max_t(long, 0, offset - ra_pages / 2);
- ra->size = ra_pages;
- ra->async_size = ra_pages / 4;
+ ra->start = max_t(long, 0, offset - ra->ra_pages / 2);
+ ra->size = ra->ra_pages;
+ ra->async_size = ra->ra_pages / 4;
ra_submit(ra, mapping, file);
}
@@ -2674,7 +2713,7 @@ EXPORT_SYMBOL(generic_file_write_iter);
* page is known to the local caching routines.
*
* The @gfp_mask argument specifies whether I/O may be performed to release
- * this page (__GFP_IO), and whether the call may block (__GFP_WAIT & __GFP_FS).
+ * this page (__GFP_IO), and whether the call may block (__GFP_RECLAIM & __GFP_FS).
*
*/
int try_to_release_page(struct page *page, gfp_t gfp_mask)