fscrypto: don't let data integrity writebacks fail with ENOMEM

[cascardo/linux.git] / fs / f2fs / data.c

diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 53fec08..5dafb9c 100644 (file)
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -992,7 +992,7 @@ submit_and_realloc:
                        if (f2fs_encrypted_inode(inode) &&
                                        S_ISREG(inode->i_mode)) {
 
-                               ctx = fscrypt_get_ctx(inode);
+                               ctx = fscrypt_get_ctx(inode, GFP_NOFS);
                                if (IS_ERR(ctx))
                                        goto set_error_page;
 
@@ -1092,14 +1092,24 @@ int do_write_data_page(struct f2fs_io_info *fio)
        }
 
        if (f2fs_encrypted_inode(inode) && S_ISREG(inode->i_mode)) {
+               gfp_t gfp_flags = GFP_NOFS;
 
                /* wait for GCed encrypted page writeback */
                f2fs_wait_on_encrypted_page_writeback(F2FS_I_SB(inode),
                                                        fio->old_blkaddr);
-
-               fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page);
+retry_encrypt:
+               fio->encrypted_page = fscrypt_encrypt_page(inode, fio->page,
+                                                               gfp_flags);
                if (IS_ERR(fio->encrypted_page)) {
                        err = PTR_ERR(fio->encrypted_page);
+                       if (err == -ENOMEM) {
+                               /* flush pending ios and wait for a while */
+                               f2fs_flush_merged_bios(F2FS_I_SB(inode));
+                               congestion_wait(BLK_RW_ASYNC, HZ/50);
+                               gfp_flags |= __GFP_NOFAIL;
+                               err = 0;
+                               goto retry_encrypt;
+                       }
                        goto out_writepage;
                }
        }