From 14a981193e409d8ca3f89768cfbd7a9a516d9927 Mon Sep 17 00:00:00 2001

From: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Date: Mon, 4 Oct 2021 18:52:24 +0300

Subject: [Backport 14a981193e40] src: Refactor ntfs_create_inode

Set size for symlink, so we don't need to calculate it on the fly.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

---

 src/inode.c | 11 ++++++++---

 1 file changed, 8 insertions(+), 3 deletions(-)

diff --git a/src/inode.c b/src/inode.c

index d618b0573533c043acd2fadc59a20e9ce0c772cb..bdebbbd53e766f7435640e55c1551be0fadccd19 100644

--- a/src/inode.c

+++ b/src/inode.c

@@ -1488,7 +1488,10 @@ struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,

 		asize = ALIGN(SIZEOF_RESIDENT + nsize, 8);

 		t16 = PtrOffset(rec, attr);

-		/* 0x78 - the size of EA + EAINFO to store WSL */

+		/*

+		 * Below function 'ntfs_save_wsl_perm' requires 0x78 bytes.

+		 * It is good idea to keep extened attributes resident.

+		 */

 		if (asize + t16 + 0x78 + 8 > sbi->record_size) {

 			CLST alen;

 			CLST clst = bytes_to_cluster(sbi, nsize);

@@ -1523,14 +1526,14 @@ struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,

 			}

 			asize = SIZEOF_NONRESIDENT + ALIGN(err, 8);

-			inode->i_size = nsize;

 		} else {

 			attr->res.data_off = SIZEOF_RESIDENT_LE;

 			attr->res.data_size = cpu_to_le32(nsize);

 			memcpy(Add2Ptr(attr, SIZEOF_RESIDENT), rp, nsize);

-			inode->i_size = nsize;

 			nsize = 0;

 		}

+		/* Size of symlink equals the length of input string. */

+		inode->i_size = size;

 		attr->size = cpu_to_le32(asize);

@@ -1567,6 +1570,8 @@ struct inode *ntfs_create_inode(struct user_namespace *mnt_userns,

 		inode->i_op = &ntfs_link_inode_operations;

 		inode->i_fop = NULL;

 		inode->i_mapping->a_ops = &ntfs_aops;

+		inode->i_size = size;

+		inode_nohighmem(inode);

 	} else if (S_ISREG(mode)) {

 		inode->i_op = &ntfs_file_inode_operations;

 		inode->i_fop = &ntfs_file_operations;

-- 

2.31.1