5.15-stable review patch. If anyone has any objections, please let me know.
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From: Rong Zhang ulin0208@gmail.com
[ Upstream commit b1e9d89408f402858c00103f9831b25ffa0994d3 ]
After applying this patch, could correctly create symlink:
ln -s "relative/path/to/file" symlink
Signed-off-by: Rong Zhang ulin0208@gmail.com [almaz.alexandrovich@paragon-software.com: added cpu_to_le32 macro to rs->Flags assignment] Signed-off-by: Konstantin Komarov almaz.alexandrovich@paragon-software.com Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ntfs3/inode.c | 31 ++++++++++++++++++------------- 1 file changed, 18 insertions(+), 13 deletions(-)
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c index 7adfa19a2f06..edd7c89ba1a1 100644 --- a/fs/ntfs3/inode.c +++ b/fs/ntfs3/inode.c @@ -1118,10 +1118,10 @@ int inode_write_data(struct inode *inode, const void *data, size_t bytes) * Number of bytes for REPARSE_DATA_BUFFER(IO_REPARSE_TAG_SYMLINK) * for unicode string of @uni_len length. */ -static inline u32 ntfs_reparse_bytes(u32 uni_len) +static inline u32 ntfs_reparse_bytes(u32 uni_len, bool is_absolute) { /* Header + unicode string + decorated unicode string. */ - return sizeof(short) * (2 * uni_len + 4) + + return sizeof(short) * (2 * uni_len + (is_absolute ? 4 : 0)) + offsetof(struct REPARSE_DATA_BUFFER, SymbolicLinkReparseBuffer.PathBuffer); } @@ -1134,8 +1134,11 @@ ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, struct REPARSE_DATA_BUFFER *rp; __le16 *rp_name; typeof(rp->SymbolicLinkReparseBuffer) *rs; + bool is_absolute;
- rp = kzalloc(ntfs_reparse_bytes(2 * size + 2), GFP_NOFS); + is_absolute = (strlen(symname) > 1 && symname[1] == ':'); + + rp = kzalloc(ntfs_reparse_bytes(2 * size + 2, is_absolute), GFP_NOFS); if (!rp) return ERR_PTR(-ENOMEM);
@@ -1150,7 +1153,7 @@ ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, goto out;
/* err = the length of unicode name of symlink. */ - *nsize = ntfs_reparse_bytes(err); + *nsize = ntfs_reparse_bytes(err, is_absolute);
if (*nsize > sbi->reparse.max_size) { err = -EFBIG; @@ -1170,7 +1173,7 @@ ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname,
/* PrintName + SubstituteName. */ rs->SubstituteNameOffset = cpu_to_le16(sizeof(short) * err); - rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + 8); + rs->SubstituteNameLength = cpu_to_le16(sizeof(short) * err + (is_absolute ? 8 : 0)); rs->PrintNameLength = rs->SubstituteNameOffset;
/* @@ -1178,16 +1181,18 @@ ntfs_create_reparse_buffer(struct ntfs_sb_info *sbi, const char *symname, * parse this path. * 0-absolute path 1- relative path (SYMLINK_FLAG_RELATIVE). */ - rs->Flags = 0; + rs->Flags = cpu_to_le32(is_absolute ? 0 : SYMLINK_FLAG_RELATIVE);
- memmove(rp_name + err + 4, rp_name, sizeof(short) * err); + memmove(rp_name + err + (is_absolute ? 4 : 0), rp_name, sizeof(short) * err);
- /* Decorate SubstituteName. */ - rp_name += err; - rp_name[0] = cpu_to_le16('\'); - rp_name[1] = cpu_to_le16('?'); - rp_name[2] = cpu_to_le16('?'); - rp_name[3] = cpu_to_le16('\'); + if (is_absolute) { + /* Decorate SubstituteName. */ + rp_name += err; + rp_name[0] = cpu_to_le16('\'); + rp_name[1] = cpu_to_le16('?'); + rp_name[2] = cpu_to_le16('?'); + rp_name[3] = cpu_to_le16('\'); + }
return rp; out: