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fs/ntfs3: correct attr_collapse_range when file is too fragmented

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Fix incorrect VCN adjustments in attr_collapse_range() that caused
filesystem errors or corruption on very fragmented NTFS files when
performing collapse-range operations.

Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>
This commit is contained in:
Konstantin Komarov
2025-10-30 23:35:24 +03:00
parent aee4d5a521
commit 2109b08024
4 changed files with 53 additions and 48 deletions
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4
fs/ntfs3/ntfs_fs.h
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@@ -777,7 +777,7 @@ bool mi_remove_attr(struct ntfs_inode *ni, struct mft_inode *mi,
struct ATTRIB *attr);
bool mi_resize_attr(struct mft_inode *mi, struct ATTRIB *attr, int bytes);
int mi_pack_runs(struct mft_inode *mi, struct ATTRIB *attr,
struct runs_tree *run, CLST len);
const struct runs_tree *run, CLST len);
static inline bool mi_is_ref(const struct mft_inode *mi,
const struct MFT_REF *ref)
{
@@ -812,7 +812,7 @@ void run_truncate_head(struct runs_tree *run, CLST vcn);
void run_truncate_around(struct runs_tree *run, CLST vcn);
bool run_add_entry(struct runs_tree *run, CLST vcn, CLST lcn, CLST len,
bool is_mft);
bool run_collapse_range(struct runs_tree *run, CLST vcn, CLST len);
bool run_collapse_range(struct runs_tree *run, CLST vcn, CLST len, CLST sub);
bool run_insert_range(struct runs_tree *run, CLST vcn, CLST len);
bool run_get_entry(const struct runs_tree *run, size_t index, CLST *vcn,
CLST *lcn, CLST *len);