Add new filemap_*wait* variants that take a "since" value and return an
error if one occurred since that sample point.
Signed-off-by: Jeff Layton <jlay...@redhat.com>
---
include/linux/fs.h | 9 ++++++++
mm/filemap.c | 67 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 76 insertions(+)
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 2f3bcf4eb73b..7d1bd3163d99 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2516,12 +2516,21 @@ extern int write_inode_now(struct inode *, int);
extern int filemap_fdatawrite(struct address_space *);
extern int filemap_flush(struct address_space *);
extern int filemap_fdatawait(struct address_space *);
+extern int filemap_fdatawait_since(struct address_space *, errseq_t);
extern void filemap_fdatawait_keep_errors(struct address_space *);
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
loff_t lend);
+extern int filemap_fdatawait_range_since(struct address_space *mapping,
+ loff_t start_byte, loff_t end_byte,
+ errseq_t since);
extern int filemap_write_and_wait(struct address_space *mapping);
+extern int filemap_write_and_wait_since(struct address_space *mapping,
+ errseq_t since);
extern int filemap_write_and_wait_range(struct address_space *mapping,
loff_t lstart, loff_t lend);
+extern int filemap_write_and_wait_range_since(struct address_space *mapping,
+ loff_t start_byte, loff_t end_byte,
+ errseq_t since);
extern int __filemap_fdatawrite_range(struct address_space *mapping,
loff_t start, loff_t end, int sync_mode);
extern int filemap_fdatawrite_range(struct address_space *mapping,
diff --git a/mm/filemap.c b/mm/filemap.c
index 97dc28f853fc..38a14dc825ad 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -431,6 +431,14 @@ int filemap_fdatawait_range(struct address_space *mapping,
loff_t start_byte,
}
EXPORT_SYMBOL(filemap_fdatawait_range);
+int filemap_fdatawait_range_since(struct address_space *mapping, loff_t
start_byte,
+ loff_t end_byte, errseq_t since)
+{
+ __filemap_fdatawait_range(mapping, start_byte, end_byte);
+ return filemap_check_wb_err(mapping, since);
+}
+EXPORT_SYMBOL(filemap_fdatawait_range_since);
+
/**
* filemap_fdatawait_keep_errors - wait for writeback without clearing errors
* @mapping: address space structure to wait for
@@ -476,6 +484,17 @@ int filemap_fdatawait(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_fdatawait);
+int filemap_fdatawait_since(struct address_space *mapping, errseq_t since)
+{
+ loff_t i_size = i_size_read(mapping->host);
+
+ if (i_size == 0)
+ return 0;
+
+ return filemap_fdatawait_range_since(mapping, 0, i_size - 1, since);
+}
+EXPORT_SYMBOL(filemap_fdatawait_since);
+
int filemap_write_and_wait(struct address_space *mapping)
{
int err = 0;
@@ -501,6 +520,31 @@ int filemap_write_and_wait(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_write_and_wait);
+int filemap_write_and_wait_since(struct address_space *mapping, errseq_t since)
+{
+ int err = 0;
+
+ if ((!dax_mapping(mapping) && mapping->nrpages) ||
+ (dax_mapping(mapping) && mapping->nrexceptional)) {
+ err = filemap_fdatawrite(mapping);
+ /*
+ * Even if the above returned error, the pages may be
+ * written partially (e.g. -ENOSPC), so we wait for it.
+ * But the -EIO is special case, it may indicate the worst
+ * thing (e.g. bug) happened, so we avoid waiting for it.
+ */
+ if (err != -EIO) {
+ int err2 = filemap_fdatawait_since(mapping, since);
+ if (!err)
+ err = err2;
+ }
+ } else {
+ err = filemap_check_wb_err(mapping, since);
+ }
+ return err;
+}
+EXPORT_SYMBOL(filemap_write_and_wait_since);
+
/**
* filemap_write_and_wait_range - write out & wait on a file range
* @mapping: the address_space for the pages
@@ -535,6 +579,29 @@ int filemap_write_and_wait_range(struct address_space
*mapping,
}
EXPORT_SYMBOL(filemap_write_and_wait_range);
+int filemap_write_and_wait_range_since(struct address_space *mapping,
+ loff_t lstart, loff_t lend, errseq_t since)
+{
+ int err = 0;
+
+ if ((!dax_mapping(mapping) && mapping->nrpages) ||
+ (dax_mapping(mapping) && mapping->nrexceptional)) {
+ err = __filemap_fdatawrite_range(mapping, lstart, lend,
+ WB_SYNC_ALL);
+ /* See comment of filemap_write_and_wait() */
+ if (err != -EIO) {
+ int err2 = filemap_fdatawait_range_since(mapping,
+ lstart, lend, since);
+ if (!err)
+ err = err2;
+ }
+ } else {
+ err = filemap_check_wb_err(mapping, since);
+ }
+ return err;
+}
+EXPORT_SYMBOL(filemap_write_and_wait_range_since);
+
void __filemap_set_wb_err(struct address_space *mapping, int err)
{
errseq_t eseq = __errseq_set(&mapping->wb_err, err);
--
2.9.4
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