linux-kernel - [PATCH] fs/ntfs3: Fix work with fragmented xattr

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Message-ID: <1645cd93-5dc3-ea35-85ed-eba4e8d2e50e@paragon-software.com>
Date:   Tue, 28 Jun 2022 17:59:41 +0300
From:   Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
To:     <ntfs3@...ts.linux.dev>
CC:     <linux-kernel@...r.kernel.org>, <linux-fsdevel@...r.kernel.org>
Subject: [PATCH] fs/ntfs3: Fix work with fragmented xattr

In some cases xattr is too fragmented,
so we need to load it before writing.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@...agon-software.com>
---
  fs/ntfs3/xattr.c | 7 ++++++-
  1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/fs/ntfs3/xattr.c b/fs/ntfs3/xattr.c
index 1e849428bbc8..e581b2bd2b75 100644
--- a/fs/ntfs3/xattr.c
+++ b/fs/ntfs3/xattr.c
@@ -118,7 +118,7 @@ static int ntfs_read_ea(struct ntfs_inode *ni, struct EA_FULL **ea,
  
  		run_init(&run);
  
-		err = attr_load_runs(attr_ea, ni, &run, NULL);
+		err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &run, 0, size);
  		if (!err)
  			err = ntfs_read_run_nb(sbi, &run, 0, ea_p, size, NULL);
  		run_close(&run);
@@ -444,6 +444,11 @@ static noinline int ntfs_set_ea(struct inode *inode, const char *name,
  		/* Delete xattr, ATTR_EA */
  		ni_remove_attr_le(ni, attr, mi, le);
  	} else if (attr->non_res) {
+		err = attr_load_runs_range(ni, ATTR_EA, NULL, 0, &ea_run, 0,
+					   size);
+		if (err)
+			goto out;
+
  		err = ntfs_sb_write_run(sbi, &ea_run, 0, ea_all, size, 0);
  		if (err)
  			goto out;
-- 
2.36.1