Forwarded: [PATCH] ntfs3: add debug warnings for run_lock initialization

syzbot
2025-10-14T11:49:09Z

Subject: [PATCH] ntfs3: add debug warnings for run_lock initialization
Author: kartikey406@gmail.com

#syz test: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

Add debug messages to track when run_lock is initialized for regular
files to help diagnose lockdep warnings.

Signed-off-by: Deepanshu Kartikey <kartikey406@gmail.com>
---
fs/ntfs3/file.c | 1 +
fs/ntfs3/inode.c | 115 +++++++++++++++++++++++++++++++++++------------
2 files changed, 87 insertions(+), 29 deletions(-)

diff --git a/fs/ntfs3/file.c b/fs/ntfs3/file.c
index 4c90ec2fa2ea..0eb218a2b999 100644
--- a/fs/ntfs3/file.c
+++ b/fs/ntfs3/file.c
@@ -773,6 +773,7 @@ static long ntfs_fallocate(struct file *file, int mode, loff_t vbo, loff_t len)
int ntfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
struct iattr *attr)
{
+ printk(KERN_WARNING "ntfs_setattr: testing by deepanshu \n");
struct inode *inode = d_inode(dentry);
struct ntfs_inode *ni = ntfs_i(inode);
u32 ia_valid = attr->ia_valid;
diff --git a/fs/ntfs3/inode.c b/fs/ntfs3/inode.c
index 3959f23c487a..d5fe133f8845 100644
--- a/fs/ntfs3/inode.c
+++ b/fs/ntfs3/inode.c
@@ -1,4 +1,4 @@
-// SPDX-License-Identifier: GPL-2.0
+// Created regular file inode// SPDX-License-Identifier: GPL-2.0
/*
*
* Copyright (C) 2019-2021 Paragon Software GmbH, All rights reserved.
@@ -50,10 +50,17 @@ static struct inode *ntfs_read_mft(struct inode *inode,
/* Setup 'uid' and 'gid' */
inode->i_uid = sbi->options->fs_uid;
inode->i_gid = sbi->options->fs_gid;
-
+
+ if (ino == 25) {
+ printk(KERN_ERR "DEEPANSHU: ntfs_read_mft ENTERED for inode 25\n");
+ }
+
err = mi_init(&ni->mi, sbi, ino);
- if (err)
+ if (err) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 - mi_init FAILED, err=%d\n", err);
goto out;
+ }

if (!sbi->mft.ni && ino == MFT_REC_MFT && !sb->s_root) {
t64 = sbi->mft.lbo >> sbi->cluster_bits;
@@ -407,8 +414,14 @@ static struct inode *ntfs_read_mft(struct inode *inode,

end_enum:

- if (!std5)
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 reached end_enum, mode=0%o\n", mode);
+
+ if (!std5) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 - NO std5, going to out\n");
goto out;
+ }

if (is_bad_inode(inode))
goto out;
@@ -436,6 +449,8 @@ static struct inode *ntfs_read_mft(struct inode *inode,
set_nlink(inode, links);

if (S_ISDIR(mode)) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 is DIR\n");
ni->std_fa |= FILE_ATTRIBUTE_DIRECTORY;

/*
@@ -449,11 +464,15 @@ static struct inode *ntfs_read_mft(struct inode *inode,
&ntfs_dir_operations;
ni->i_valid = 0;
} else if (S_ISLNK(mode)) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 is SYMLINK\n");
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
inode->i_op = &ntfs_link_inode_operations;
inode->i_fop = NULL;
inode_nohighmem(inode);
} else if (S_ISREG(mode)) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 is REGULAR FILE, about to init lock\n");
ni->std_fa &= ~FILE_ATTRIBUTE_DIRECTORY;
inode->i_op = &ntfs_file_inode_operations;
inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
@@ -461,18 +480,27 @@ static struct inode *ntfs_read_mft(struct inode *inode,
&ntfs_file_operations;
inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
&ntfs_aops;
- if (ino != MFT_REC_MFT)
+ if (ino != MFT_REC_MFT) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 - INITIALIZING run_lock NOW\n");
init_rwsem(&ni->file.run_lock);
+ }
} else if (S_ISCHR(mode) || S_ISBLK(mode) || S_ISFIFO(mode) ||
S_ISSOCK(mode)) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 is SPECIAL\n");
inode->i_op = &ntfs_special_inode_operations;
init_special_inode(inode, mode, inode->i_rdev);
} else if (fname && fname->home.low == cpu_to_le32(MFT_REC_EXTEND) &&
fname->home.seq == cpu_to_le16(MFT_REC_EXTEND)) {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 is EXTEND record\n");
/* Records in $Extend are not a files or general directories. */
inode->i_op = &ntfs_file_inode_operations;
mode = S_IFREG;
} else {
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 - INVALID mode, going to out\n");
err = -EINVAL;
goto out;
}
@@ -494,11 +522,16 @@ static struct inode *ntfs_read_mft(struct inode *inode,
if (ino == MFT_REC_MFT && !sb->s_root)
sbi->mft.ni = NULL;

+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 - SUCCESS, about to unlock_new_inode\n");
+
unlock_new_inode(inode);

return inode;

out:
+ if (ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 - ERROR PATH, err=%d\n", err);
if (ino == MFT_REC_MFT && !sb->s_root)
sbi->mft.ni = NULL;

@@ -527,33 +560,52 @@ static int ntfs_set_inode(struct inode *inode, void *data)
}

struct inode *ntfs_iget5(struct super_block *sb, const struct MFT_REF *ref,
- const struct cpu_str *name)
+ const struct cpu_str *name)
{
- struct inode *inode;
-
- inode = iget5_locked(sb, ino_get(ref), ntfs_test_inode, ntfs_set_inode,
- (void *)ref);
- if (unlikely(!inode))
- return ERR_PTR(-ENOMEM);
-
- /* If this is a freshly allocated inode, need to read it now. */
- if (inode->i_state & I_NEW)
- inode = ntfs_read_mft(inode, name, ref);
- else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
- /*
- * Sequence number is not expected.
- * Looks like inode was reused but caller uses the old reference
- */
- iput(inode);
- inode = ERR_PTR(-ESTALE);
- }
-
- if (IS_ERR(inode))
- ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
-
- return inode;
+ struct inode *inode;
+ unsigned long ino = ino_get(ref);
+
+ if (ino == 25) {
+ printk(KERN_ERR "DEEPANSHU: ntfs_iget5 START for inode 25\n");
+ //dump_stack();
+ }
+
+ inode = iget5_locked(sb, ino, ntfs_test_inode, ntfs_set_inode,
+ (void *)ref);
+
+ if (unlikely(!inode))
+ return ERR_PTR(-ENOMEM);
+
+ if (inode->i_ino == 25) {
+ printk(KERN_ERR "DEEPANSHU: After iget5_locked for inode 25, I_NEW=%d, i_state=0x%x\n",
+ !!(inode->i_state & I_NEW), inode->i_state);
+ //dump_stack();
+ }
+
+ /* If this is a freshly allocated inode, need to read it now. */
+ if (inode->i_state & I_NEW) {
+ if (inode->i_ino == 25)
+ printk(KERN_ERR "DEEPANSHU: Calling ntfs_read_mft for inode 25\n");
+ inode = ntfs_read_mft(inode, name, ref);
+ if (inode->i_ino == 25 && IS_ERR(inode))
+ printk(KERN_ERR "DEEPANSHU: ntfs_read_mft FAILED for inode 25\n");
+ } else if (ref->seq != ntfs_i(inode)->mi.mrec->seq) {
+ if (inode->i_ino == 25)
+ printk(KERN_ERR "DEEPANSHU: inode 25 seq mismatch\n");
+ iput(inode);
+ inode = ERR_PTR(-ESTALE);
+ } else if (inode->i_ino == 25) {
+ printk(KERN_ERR "DEEPANSHU: inode 25 found in CACHE, skipping ntfs_read_mft!\n");
+ //dump_stack();
+ }
+
+ if (IS_ERR(inode))
+ ntfs_set_state(sb->s_fs_info, NTFS_DIRTY_ERROR);
+
+ return inode;
}

+
enum get_block_ctx {
GET_BLOCK_GENERAL = 0,
GET_BLOCK_WRITE_BEGIN = 1,
@@ -1180,6 +1232,8 @@ int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
umode_t mode, dev_t dev, const char *symname, u32 size,
struct ntfs_fnd *fnd)
{
+ printk(KERN_WARNING "GET THE MESSAGE deepanshu \n");
+ //ntfs_warn(sb, "DEBUG: In inodde function");
int err;
struct super_block *sb = dir->i_sb;
struct ntfs_sb_info *sbi = sb->s_fs_info;
@@ -1597,6 +1651,7 @@ int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
inode->i_size = size;
inode_nohighmem(inode);
} else if (S_ISREG(mode)) {
+ ntfs_warn(dir->i_sb, "DEBUG: Setting up regular file inode %lu", inode->i_ino);
inode->i_op = &ntfs_file_inode_operations;
inode->i_fop = unlikely(is_legacy_ntfs(sb)) ?
&ntfs_legacy_file_operations :
@@ -1604,6 +1659,8 @@ int ntfs_create_inode(struct mnt_idmap *idmap, struct inode *dir,
inode->i_mapping->a_ops = is_compressed(ni) ? &ntfs_aops_cmpr :
&ntfs_aops;
init_rwsem(&ni->file.run_lock);
+ ntfs_warn(sb, "DEBUG: Created regular file inode %lu, run_lock initialized",
+ inode->i_ino);
} else {
inode->i_op = &ntfs_special_inode_operations;
init_special_inode(inode, mode, dev);
--
2.43.0