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authorJeff Layton <jlayton@redhat.com>2017-07-06 14:02:22 +0300
committerJeff Layton <jlayton@redhat.com>2017-07-06 14:02:22 +0300
commit76341cabbdad65c10a4162e9dfa82a6342afc02f (patch)
tree92413633a5fc6554fecd37842a4bcfd06fde0adb
parent87354e5de04fe727227ff619af164202adcfa4d4 (diff)
downloadlinux-76341cabbdad65c10a4162e9dfa82a6342afc02f.tar.xz
jbd2: don't clear and reset errors after waiting on writeback
Resetting this flag is almost certainly racy, and will be problematic with some coming changes. Make filemap_fdatawait_keep_errors return int, but not clear the flag(s). Have jbd2 call it instead of filemap_fdatawait and don't attempt to re-set the error flag if it fails. Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Carlos Maiolino <cmaiolino@redhat.com> Signed-off-by: Jeff Layton <jlayton@redhat.com>
-rw-r--r--fs/jbd2/commit.c16
-rw-r--r--include/linux/fs.h2
-rw-r--r--mm/filemap.c16
3 files changed, 19 insertions, 15 deletions
diff --git a/fs/jbd2/commit.c b/fs/jbd2/commit.c
index b6b194ec1b4f..3c1c31321d9b 100644
--- a/fs/jbd2/commit.c
+++ b/fs/jbd2/commit.c
@@ -263,18 +263,10 @@ static int journal_finish_inode_data_buffers(journal_t *journal,
continue;
jinode->i_flags |= JI_COMMIT_RUNNING;
spin_unlock(&journal->j_list_lock);
- err = filemap_fdatawait(jinode->i_vfs_inode->i_mapping);
- if (err) {
- /*
- * Because AS_EIO is cleared by
- * filemap_fdatawait_range(), set it again so
- * that user process can get -EIO from fsync().
- */
- mapping_set_error(jinode->i_vfs_inode->i_mapping, -EIO);
-
- if (!ret)
- ret = err;
- }
+ err = filemap_fdatawait_keep_errors(
+ jinode->i_vfs_inode->i_mapping);
+ if (!ret)
+ ret = err;
spin_lock(&journal->j_list_lock);
jinode->i_flags &= ~JI_COMMIT_RUNNING;
smp_mb();
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 803e5a9b2654..8ac8df1b3550 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -2514,7 +2514,7 @@ 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 void filemap_fdatawait_keep_errors(struct address_space *);
+extern int filemap_fdatawait_keep_errors(struct address_space *mapping);
extern int filemap_fdatawait_range(struct address_space *, loff_t lstart,
loff_t lend);
extern int filemap_write_and_wait(struct address_space *mapping);
diff --git a/mm/filemap.c b/mm/filemap.c
index 6f1be573a5e6..e5711b2728f4 100644
--- a/mm/filemap.c
+++ b/mm/filemap.c
@@ -309,6 +309,16 @@ int filemap_check_errors(struct address_space *mapping)
}
EXPORT_SYMBOL(filemap_check_errors);
+static int filemap_check_and_keep_errors(struct address_space *mapping)
+{
+ /* Check for outstanding write errors */
+ if (test_bit(AS_EIO, &mapping->flags))
+ return -EIO;
+ if (test_bit(AS_ENOSPC, &mapping->flags))
+ return -ENOSPC;
+ return 0;
+}
+
/**
* __filemap_fdatawrite_range - start writeback on mapping dirty pages in range
* @mapping: address space structure to write
@@ -453,15 +463,17 @@ EXPORT_SYMBOL(filemap_fdatawait_range);
* call sites are system-wide / filesystem-wide data flushers: e.g. sync(2),
* fsfreeze(8)
*/
-void filemap_fdatawait_keep_errors(struct address_space *mapping)
+int filemap_fdatawait_keep_errors(struct address_space *mapping)
{
loff_t i_size = i_size_read(mapping->host);
if (i_size == 0)
- return;
+ return 0;
__filemap_fdatawait_range(mapping, 0, i_size - 1);
+ return filemap_check_and_keep_errors(mapping);
}
+EXPORT_SYMBOL(filemap_fdatawait_keep_errors);
/**
* filemap_fdatawait - wait for all under-writeback pages to complete