From: Konstantin Komarov almaz.alexandrovich@paragon-software.com
stable inclusion from stable-v6.6.33 commit e4fd2dce71fbdf58ca3c77f3cb2badec89aa9cc4 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IAD6H2
Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...
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commit 110b24eb1a749bea3440f3ca2ff890a26179050a upstream.
When counting and checking hard links in an ntfs file record,
struct MFT_REC { struct NTFS_RECORD_HEADER rhdr; // 'FILE' __le16 seq; // 0x10: Sequence number for this record.
__le16 hard_links; // 0x12: The number of hard links to record.
__le16 attr_off; // 0x14: Offset to attributes. ...
the ntfs3 driver ignored short names (DOS names), causing the link count to be reduced by 1 and messages to be output to dmesg.
For Windows, such a situation is a minor error, meaning chkdsk does not report errors on such a volume, and in the case of using the /f switch, it silently corrects them, reporting that no errors were found. This does not affect the consistency of the file system.
Nevertheless, the behavior in the ntfs3 driver is incorrect and changes the content of the file system. This patch should fix that.
PS: most likely, there has been a confusion of concepts MFT_REC::hard_links and inode::__i_nlink.
Fixes: 82cae269cfa95 ("fs/ntfs3: Add initialization of super block") Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org Signed-off-by: Wang Hai wanghai38@huawei.com --- fs/ntfs3/inode.c | 7 ++++--- fs/ntfs3/record.c | 11 ++--------- 2 files changed, 6 insertions(+), 12 deletions(-)
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c index e9314778a9d0..6af705ccba65 100644 --- a/fs/ntfs3/inode.c +++ b/fs/ntfs3/inode.c @@ -37,7 +37,7 @@ static struct inode *ntfs_read_mft(struct inode *inode, bool is_dir; unsigned long ino = inode->i_ino; u32 rp_fa = 0, asize, t32; - u16 roff, rsize, names = 0; + u16 roff, rsize, names = 0, links = 0; const struct ATTR_FILE_NAME *fname = NULL; const struct INDEX_ROOT *root; struct REPARSE_DATA_BUFFER rp; // 0x18 bytes @@ -198,11 +198,12 @@ static struct inode *ntfs_read_mft(struct inode *inode, rsize < SIZEOF_ATTRIBUTE_FILENAME) goto out;
+ names += 1; fname = Add2Ptr(attr, roff); if (fname->type == FILE_NAME_DOS) goto next_attr;
- names += 1; + links += 1; if (name && name->len == fname->name_len && !ntfs_cmp_names_cpu(name, (struct le_str *)&fname->name_len, NULL, false)) @@ -429,7 +430,7 @@ static struct inode *ntfs_read_mft(struct inode *inode, ni->mi.dirty = true; }
- set_nlink(inode, names); + set_nlink(inode, links);
if (S_ISDIR(mode)) { ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY; diff --git a/fs/ntfs3/record.c b/fs/ntfs3/record.c index 6aa3a9d44df1..6c76503edc20 100644 --- a/fs/ntfs3/record.c +++ b/fs/ntfs3/record.c @@ -534,16 +534,9 @@ bool mi_remove_attr(struct ntfs_inode *ni, struct mft_inode *mi, if (aoff + asize > used) return false;
- if (ni && is_attr_indexed(attr)) { + if (ni && is_attr_indexed(attr) && attr->type == ATTR_NAME) { u16 links = le16_to_cpu(ni->mi.mrec->hard_links); - struct ATTR_FILE_NAME *fname = - attr->type != ATTR_NAME ? - NULL : - resident_data_ex(attr, - SIZEOF_ATTRIBUTE_FILENAME); - if (fname && fname->type == FILE_NAME_DOS) { - /* Do not decrease links count deleting DOS name. */ - } else if (!links) { + if (!links) { /* minor error. Not critical. */ } else { ni->mi.mrec->hard_links = cpu_to_le16(links - 1);