summaryrefslogtreecommitdiff
path: root/mm/filemap.c
diff options
context:
space:
mode:
Diffstat (limited to 'mm/filemap.c')
-rw-r--r--mm/filemap.c60
1 files changed, 57 insertions, 3 deletions
diff --git a/mm/filemap.c b/mm/filemap.c
index 30de18c4fd28..1d6b3a369077 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -1540,7 +1540,7 @@ EXPORT_SYMBOL(folio_end_private_2);
* folio_wait_private_2 - Wait for PG_private_2 to be cleared on a folio.
* @folio: The folio to wait on.
*
- * Wait for PG_private_2 (aka PG_fscache) to be cleared on a folio.
+ * Wait for PG_private_2 to be cleared on a folio.
*/
void folio_wait_private_2(struct folio *folio)
{
@@ -1553,8 +1553,8 @@ EXPORT_SYMBOL(folio_wait_private_2);
* folio_wait_private_2_killable - Wait for PG_private_2 to be cleared on a folio.
* @folio: The folio to wait on.
*
- * Wait for PG_private_2 (aka PG_fscache) to be cleared on a folio or until a
- * fatal signal is received by the calling task.
+ * Wait for PG_private_2 to be cleared on a folio or until a fatal signal is
+ * received by the calling task.
*
* Return:
* - 0 if successful.
@@ -4134,6 +4134,60 @@ bool filemap_release_folio(struct folio *folio, gfp_t gfp)
}
EXPORT_SYMBOL(filemap_release_folio);
+/**
+ * filemap_invalidate_inode - Invalidate/forcibly write back a range of an inode's pagecache
+ * @inode: The inode to flush
+ * @flush: Set to write back rather than simply invalidate.
+ * @start: First byte to in range.
+ * @end: Last byte in range (inclusive), or LLONG_MAX for everything from start
+ * onwards.
+ *
+ * Invalidate all the folios on an inode that contribute to the specified
+ * range, possibly writing them back first. Whilst the operation is
+ * undertaken, the invalidate lock is held to prevent new folios from being
+ * installed.
+ */
+int filemap_invalidate_inode(struct inode *inode, bool flush,
+ loff_t start, loff_t end)
+{
+ struct address_space *mapping = inode->i_mapping;
+ pgoff_t first = start >> PAGE_SHIFT;
+ pgoff_t last = end >> PAGE_SHIFT;
+ pgoff_t nr = end == LLONG_MAX ? ULONG_MAX : last - first + 1;
+
+ if (!mapping || !mapping->nrpages || end < start)
+ goto out;
+
+ /* Prevent new folios from being added to the inode. */
+ filemap_invalidate_lock(mapping);
+
+ if (!mapping->nrpages)
+ goto unlock;
+
+ unmap_mapping_pages(mapping, first, nr, false);
+
+ /* Write back the data if we're asked to. */
+ if (flush) {
+ struct writeback_control wbc = {
+ .sync_mode = WB_SYNC_ALL,
+ .nr_to_write = LONG_MAX,
+ .range_start = start,
+ .range_end = end,
+ };
+
+ filemap_fdatawrite_wbc(mapping, &wbc);
+ }
+
+ /* Wait for writeback to complete on all folios and discard. */
+ truncate_inode_pages_range(mapping, start, end);
+
+unlock:
+ filemap_invalidate_unlock(mapping);
+out:
+ return filemap_check_errors(mapping);
+}
+EXPORT_SYMBOL_GPL(filemap_invalidate_inode);
+
#ifdef CONFIG_CACHESTAT_SYSCALL
/**
* filemap_cachestat() - compute the page cache statistics of a mapping