AI Trajectory

null

{
  "EnableConfigs": [
    "EXFAT_FS"
  ],
  "FocusSymbols": [
    "fs_bdev_freeze",
    "__exfat_fs_error"
  ],
  "Reasoning": "The patch modifies VFS block device freezing logic (`fs_bdev_freeze`) to properly thaw the superblock if `sync_blockdev` fails, preventing a frozen state leak. It also modifies exfat error handling (`__exfat_fs_error`) to set a shutdown flag instead of directly modifying `sb-\u003es_flags` with `SB_RDONLY` without holding the `s_umount` semaphore, which previously caused deadlocks with `freeze_super()`. Both are functional changes in reachable code paths that should be fuzzed.",
  "WorthFuzzing": true
}

null

{
  "PatchDiff": "commit 4a16e13834f3aa39580beea7f28adcfca21e925d\nAuthor: syz-cluster \u003ctriage@syzkaller.com\u003e\nDate:   Tue Jul 21 10:16:52 2026 +0000\n\n    syz-cluster: applied patch under review\n\ndiff --git a/fs/exfat/misc.c b/fs/exfat/misc.c\nindex 6f11a96a4ffa84..dbb3b290704545 100644\n--- a/fs/exfat/misc.c\n+++ b/fs/exfat/misc.c\n@@ -41,7 +41,14 @@ void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)\n \t\tpanic(\"exFAT-fs (%s): fs panic from previous error\\n\",\n \t\t\tsb-\u003es_id);\n \t} else if (opts-\u003eerrors == EXFAT_ERRORS_RO \u0026\u0026 !sb_rdonly(sb)) {\n-\t\tsb-\u003es_flags |= SB_RDONLY;\n+\t\tset_bit(EXFAT_FLAGS_SHUTDOWN, \u0026EXFAT_SB(sb)-\u003es_exfat_flags);\n+\t\t/*\n+\t\t * We have already set EXFAT_FLAGS_SHUTDOWN flag to stop all updates\n+\t\t * to filesystem, so it doesn't need to set SB_RDONLY flag here\n+\t\t * because the flag should be set covered w/ sb-\u003es_umount semaphore\n+\t\t * via remount procedure, otherwise, it will confuse code like\n+\t\t * freeze_super() which will lead to deadlocks and other problems.\n+\t\t */\n \t\texfat_err(sb, \"Filesystem has been set read-only\");\n \t}\n }\ndiff --git a/fs/super.c b/fs/super.c\nindex a8fd61136aafe5..909d8b9abb887a 100644\n--- a/fs/super.c\n+++ b/fs/super.c\n@@ -1481,8 +1481,23 @@ static int fs_bdev_freeze(struct block_device *bdev)\n \telse\n \t\terror = freeze_super(sb,\n \t\t\t\tFREEZE_MAY_NEST | FREEZE_HOLDER_USERSPACE, NULL);\n-\tif (!error)\n+\tif (!error) {\n \t\terror = sync_blockdev(bdev);\n+\t\tif (error) {\n+\t\t\tif (sb-\u003es_op-\u003ethaw_super)\n+\t\t\t\t(void)sb-\u003es_op-\u003ethaw_super(\n+\t\t\t\t\tsb,\n+\t\t\t\t\tFREEZE_MAY_NEST |\n+\t\t\t\t\t\tFREEZE_HOLDER_USERSPACE,\n+\t\t\t\t\tNULL);\n+\t\t\telse\n+\t\t\t\t(void)thaw_super(\n+\t\t\t\t\tsb,\n+\t\t\t\t\tFREEZE_MAY_NEST |\n+\t\t\t\t\t\tFREEZE_HOLDER_USERSPACE,\n+\t\t\t\t\tNULL);\n+\t\t}\n+\t}\n \tdeactivate_super(sb);\n \treturn error;\n }\n"
}

best-expensive

null

{
  "EnableConfigs": [
    "EXFAT_FS"
  ],
  "FocusSymbols": [
    "fs_bdev_freeze",
    "__exfat_fs_error"
  ],
  "Reasoning": "The patch modifies VFS block device freezing logic (`fs_bdev_freeze`) to properly thaw the superblock if `sync_blockdev` fails, preventing a frozen state leak. It also modifies exfat error handling (`__exfat_fs_error`) to set a shutdown flag instead of directly modifying `sb-\u003es_flags` with `SB_RDONLY` without holding the `s_umount` semaphore, which previously caused deadlocks with `freeze_super()`. Both are functional changes in reachable code paths that should be fuzzed.",
  "WorthFuzzing": true
}

You are an expert Linux kernel maintainer.
Your job is to review a provided patch series and determine
if it makes functional changes to the kernel that should be fuzzed.

IMPORTANT: The changes have ALREADY been applied and committed as the HEAD commit in
your workspace. Do NOT rely on your internal knowledge of the kernel. You must actively
use your code access tools to examine the actual source code and confirm any assumptions.

Return WorthFuzzing=false if the patch only contains:
- Modifications to Documentation/, Kconfig files, or code comments.
- Purely decorative changes, such as logging (e.g., pr_err, printk) or tracepoints.
- Changes to numeric constants or macros that do not functionally alter execution flow.
- Code paths that are impossible to reach in virtualized environments like GCE or QEMU,
even when utilizing software-emulated hardware (e.g., usb gadget, mac80211_hwsim).

If it modifies reachable core kernel logic, drivers, or architectures, use your code search
tools to verify the code can be executed, then return WorthFuzzing=true.

When returning WorthFuzzing=true, you MUST ALSO:
1. Extract any specific kernel functions that should be heavily fuzzed into FocusSymbols.
   Avoid listing generic hot-path functions to prevent skewed test distributions.
2. Identify any specific CONFIG_ options required to properly test this new/modified feature.
   Go and look into the Kconfig files and check for ifdefs around the code, do not make assumptions.
   Do not list too generic configs (we already have them enabled). Only list those that
   specifically cover the modified code. List them in the EnableConfigs output array,
   and DO NOT add a 'CONFIG_' prefix (e.g., return "NET_IPV4" instead of "CONFIG_NET_IPV4").
Prefer calling several tools at the same time to save round-trips.


Use set-results tool to provide results of the analysis.
It must be called exactly once before the final reply.
Ignore results of this tool.

For your convenience, here is the diff of the changes:
commit 4a16e13834f3aa39580beea7f28adcfca21e925d
Author: syz-cluster <triage@syzkaller.com>
Date:   Tue Jul 21 10:16:52 2026 +0000

    syz-cluster: applied patch under review

diff --git a/fs/exfat/misc.c b/fs/exfat/misc.c
index 6f11a96a4ffa84..dbb3b290704545 100644
--- a/fs/exfat/misc.c
+++ b/fs/exfat/misc.c
@@ -41,7 +41,14 @@ void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
 		panic("exFAT-fs (%s): fs panic from previous error\n",
 			sb->s_id);
 	} else if (opts->errors == EXFAT_ERRORS_RO && !sb_rdonly(sb)) {
-		sb->s_flags |= SB_RDONLY;
+		set_bit(EXFAT_FLAGS_SHUTDOWN, &EXFAT_SB(sb)->s_exfat_flags);
+		/*
+		 * We have already set EXFAT_FLAGS_SHUTDOWN flag to stop all updates
+		 * to filesystem, so it doesn't need to set SB_RDONLY flag here
+		 * because the flag should be set covered w/ sb->s_umount semaphore
+		 * via remount procedure, otherwise, it will confuse code like
+		 * freeze_super() which will lead to deadlocks and other problems.
+		 */
 		exfat_err(sb, "Filesystem has been set read-only");
 	}
 }
diff --git a/fs/super.c b/fs/super.c
index a8fd61136aafe5..909d8b9abb887a 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1481,8 +1481,23 @@ static int fs_bdev_freeze(struct block_device *bdev)
 	else
 		error = freeze_super(sb,
 				FREEZE_MAY_NEST | FREEZE_HOLDER_USERSPACE, NULL);
-	if (!error)
+	if (!error) {
 		error = sync_blockdev(bdev);
+		if (error) {
+			if (sb->s_op->thaw_super)
+				(void)sb->s_op->thaw_super(
+					sb,
+					FREEZE_MAY_NEST |
+						FREEZE_HOLDER_USERSPACE,
+					NULL);
+			else
+				(void)thaw_super(
+					sb,
+					FREEZE_MAY_NEST |
+						FREEZE_HOLDER_USERSPACE,
+					NULL);
+		}
+	}
 	deactivate_super(sb);
 	return error;
 }

gemini-3.1-pro-preview

null

null

							input: 2354
							output: 20
							thoughts: 210
						

**Analyzing the ExFAT Patch**

Okay, so I've got these two patches, one touching `fs/exfat/misc.c` and the other `fs/super.c`. The first one, in `misc.c`, looks like it's tweaking `__exfat_fs_error`. Instead of directly setting `SB_RDONLY` on the super block's flags (`sb->s_flags`), it's now setting `EXFAT_FLAGS_SHUTDOWN`. Interesting. That’s a change in how we handle errors and potentially shutdown the filesystem gracefully. I want to understand the implications of that shift.

The second patch modifies `fs_bdev_freeze` in `fs/super.c`. That’s a fundamental VFS function, which is worth a closer look, especially with the potential interplay with the first change. The modification involves thawing the superblock if `sync_blockdev(bdev)` fails. That suggests this may change the behavior of the freeze/thaw process. This is obviously related to block device synchronization, so let's keep that in mind.

Before I go too deep, I need to get a handle on the overall context. I need to understand how these pieces fit together. So, my next move is to search the codebase. I'll use `git grep` to find all occurrences of both `fs_bdev_freeze` and `__exfat_fs_error` within the relevant file tree. That should give me a good overview of their uses, potential interactions, and any other relevant code in this area. From there, I can start to form a complete understanding of the patch and how it impacts the filesystem.

{
  "Expression": "fs_bdev_freeze"
}

{
  "Output": "fs/super.c=1437=static struct super_block *get_bdev_super(struct block_device *bdev)\n--\nfs/super.c-1452-/**\nfs/super.c:1453: * fs_bdev_freeze - freeze owning filesystem of block device\nfs/super.c-1454- * @bdev: block device\n--\nfs/super.c-1466- */\nfs/super.c:1467:static int fs_bdev_freeze(struct block_device *bdev)\nfs/super.c-1468-{\n--\nfs/super.c=1552=const struct blk_holder_ops fs_holder_ops = {\n--\nfs/super.c-1554-\t.sync\t\t\t= fs_bdev_sync,\nfs/super.c:1555:\t.freeze\t\t\t= fs_bdev_freeze,\nfs/super.c-1556-\t.thaw\t\t\t= fs_bdev_thaw,\n"
}

gemini-3.1-pro-preview

null

null

							input: 3204
							output: 19
							thoughts: 36
						

Okay, here's my interpretation of that thought process, assuming I'm deep in the weeds of filesystem implementation:

**Tracing the Freeze Operation**

Right, so `fs_bdev_freeze` is clearly the critical function in freezing a block device for a filesystem, and it's being called through the `fs_holder_ops.freeze` mechanism. That's good, that gives me a specific point to start.

Now, I need to understand the *context* of this freeze operation. `fs_holder_ops`...that's an interface, a collection of operations a filesystem implements, right? I need to know *who* or *what* is using this specific `fs_holder_ops` structure that's calling `freeze`. Knowing where `fs_holder_ops` is *used* will give me the bigger picture. Are we talking about a whole volume group, a single filesystem, some kind of layered storage? This will determine the scope and implications of the freeze. Let's trace back the calls... let's figure out the callers of `fs_holder_ops`. Time to fire up the debugger and start digging into the cross-references.

{
  "Expression": "fs_holder_ops"
}

{
  "Output": "fs/btrfs/dev-replace.c=232=static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,\n--\nfs/btrfs/dev-replace.c-250-\tbdev_file = bdev_file_open_by_path(device_path, BLK_OPEN_WRITE,\nfs/btrfs/dev-replace.c:251:\t\t\t\t\t   fs_info-\u003esb, \u0026fs_holder_ops);\nfs/btrfs/dev-replace.c-252-\tif (IS_ERR(bdev_file)) {\n--\nfs/btrfs/volumes.c=476=btrfs_get_bdev_and_sb(const char *device_path, blk_mode_t flags, void *holder,\n--\nfs/btrfs/volumes.c-482-\nfs/btrfs/volumes.c:483:\t*bdev_file = bdev_file_open_by_path(device_path, flags, holder, \u0026fs_holder_ops);\nfs/btrfs/volumes.c-484-\n--\nfs/btrfs/volumes.c=2848=int btrfs_init_new_device(struct btrfs_fs_info *fs_info, const char *device_path)\n--\nfs/btrfs/volumes.c-2866-\tbdev_file = bdev_file_open_by_path(device_path, BLK_OPEN_WRITE,\nfs/btrfs/volumes.c:2867:\t\t\t\t\t   fs_info-\u003esb, \u0026fs_holder_ops);\nfs/btrfs/volumes.c-2868-\tif (IS_ERR(bdev_file))\n--\nfs/ext4/super.c=5971=static struct file *ext4_get_journal_blkdev(struct super_block *sb,\n--\nfs/ext4/super.c-5985-\t\tBLK_OPEN_READ | BLK_OPEN_WRITE | BLK_OPEN_RESTRICT_WRITES,\nfs/ext4/super.c:5986:\t\tsb, \u0026fs_holder_ops);\nfs/ext4/super.c-5987-\tif (IS_ERR(bdev_file)) {\n--\nfs/super.c=1522=static int fs_bdev_thaw(struct block_device *bdev)\n--\nfs/super.c-1551-\nfs/super.c:1552:const struct blk_holder_ops fs_holder_ops = {\nfs/super.c-1553-\t.mark_dead\t\t= fs_bdev_mark_dead,\n--\nfs/super.c-1557-};\nfs/super.c:1558:EXPORT_SYMBOL_GPL(fs_holder_ops);\nfs/super.c-1559-\nfs/super.c=1560=int setup_bdev_super(struct super_block *sb, int sb_flags,\n--\nfs/super.c-1566-\nfs/super.c:1567:\tbdev_file = bdev_file_open_by_dev(sb-\u003es_dev, mode, sb, \u0026fs_holder_ops);\nfs/super.c-1568-\tif (IS_ERR(bdev_file)) {\n--\nfs/xfs/xfs_super.c=394=xfs_blkdev_get(\n--\nfs/xfs/xfs_super.c-403-\t*bdev_filep = bdev_file_open_by_path(name, mode,\nfs/xfs/xfs_super.c:404:\t\t\tmp-\u003em_super, \u0026fs_holder_ops);\nfs/xfs/xfs_super.c-405-\tif (IS_ERR(*bdev_filep)) {\n--\ninclude/linux/blkdev.h=1750=struct blk_holder_ops {\n--\ninclude/linux/blkdev.h-1773-/*\ninclude/linux/blkdev.h:1774: * For filesystems using @fs_holder_ops, the @holder argument passed to\ninclude/linux/blkdev.h-1775- * helpers used to open and claim block devices via\n--\ninclude/linux/blkdev.h-1777- */\ninclude/linux/blkdev.h:1778:extern const struct blk_holder_ops fs_holder_ops;\ninclude/linux/blkdev.h-1779-\n"
}

gemini-3.1-pro-preview

null

null

							input: 4655
							output: 16
							thoughts: 55
						

Okay, let's see what I'm thinking here.

**Deconstructing Block Device Freezing Operations**

Alright, so I'm tracing the usage of `fs_holder_ops` and it's popping up in `setup_bdev_super` and a few other locations, which isn't entirely surprising. That function is pretty fundamental for establishing block device superblocks, so holder operations are likely relevant there. My primary interest is with the `freeze` operation. I need to understand its role in this context, specifically regarding block devices. The key question is, *who* is calling this `freeze` function defined in `blk_holder_ops`? I need to figure out the callers of `freeze` within `blk_holder_ops`. Time to dig deeper and find out.

{
  "Expression": "-\u003efreeze"
}

{
  "Output": "\nFull output is too long, showing 500 out of 731 lines.\nUse more precise expression if possible.\n\nDocumentation/driver-api/libata.rst=268=follows a successful reset.\nDocumentation/driver-api/libata.rst-269-\nDocumentation/driver-api/libata.rst:270:The optional ``-\u003efreeze()`` callback can be used for freezing the port\nDocumentation/driver-api/libata.rst-271-hardware-wise (e.g. mask interrupt and stop DMA engine). If a port\n--\nDocumentation/driver-api/libata.rst=275=The optional ``-\u003ethaw()`` callback is called to perform the opposite of\nDocumentation/driver-api/libata.rst:276:``-\u003efreeze()``: prepare the port for normal operation once again. Unmask\nDocumentation/driver-api/libata.rst-277-interrupts, start DMA engine, etc.\n--\nDocumentation/driver-api/pm/devices.rst=517=the system (\"power off\").  The phases used to accomplish this are: ``prepare``,\n--\nDocumentation/driver-api/pm/devices.rst-524-\nDocumentation/driver-api/pm/devices.rst:525:    2.\tThe ``-\u003efreeze`` methods should quiesce the device so that it doesn't\nDocumentation/driver-api/pm/devices.rst-526-\tgenerate IRQs or DMA, and they may need to save the values of device\n--\nDocumentation/driver-api/pm/devices.rst=764=transition into a sleep state, that can be done by calling\nDocumentation/driver-api/pm/devices.rst:765::c:func:`pm_runtime_resume` from the ``-\u003esuspend`` callback (or the ``-\u003efreeze``\nDocumentation/driver-api/pm/devices.rst-766-or ``-\u003epoweroff`` callback for transitions related to hibernation) of either the\n--\nDocumentation/filesystems/vfs.rst=220=or bottom half).\n--\nDocumentation/filesystems/vfs.rst-283-``freeze_super``\nDocumentation/filesystems/vfs.rst:284:\tCalled instead of -\u003efreeze_fs callback if provided.\nDocumentation/filesystems/vfs.rst:285:\tMain difference is that -\u003efreeze_super is called without taking\nDocumentation/filesystems/vfs.rst-286-\tdown_write(\u0026sb-\u003es_umount). If filesystem implements it and wants\nDocumentation/filesystems/vfs.rst:287:\t-\u003efreeze_fs to be called too, then it has to call -\u003efreeze_fs\nDocumentation/filesystems/vfs.rst-288-\texplicitly from this callback. Optional.\n--\nDocumentation/filesystems/vfs.rst-296-\tcalled when VFS is unlocking a filesystem and making it writable\nDocumentation/filesystems/vfs.rst:297:\tagain after -\u003efreeze_super. Optional.\nDocumentation/filesystems/vfs.rst-298-\n--\nDocumentation/filesystems/vfs.rst-300-\tcalled when VFS is unlocking a filesystem and making it writable\nDocumentation/filesystems/vfs.rst:301:\tagain after -\u003efreeze_fs. Optional.\nDocumentation/filesystems/vfs.rst-302-\n--\nDocumentation/filesystems/xfs/xfs-online-fsck-design.rst=3007=long enough to check and correct the summary counters.\n--\nDocumentation/filesystems/xfs/xfs-online-fsck-design.rst-3021-| - Adding an extra lock to prevent others from thawing the filesystem     |\nDocumentation/filesystems/xfs/xfs-online-fsck-design.rst:3022:|   required the addition of a ``-\u003efreeze_super`` function to wrap         |\nDocumentation/filesystems/xfs/xfs-online-fsck-design.rst-3023-|   ``freeze_fs()``.                                                       |\n--\nDocumentation/power/pci.rst=575=The pci_pm_freeze() routine is quite similar to pci_pm_suspend(), but it runs\nDocumentation/power/pci.rst:576:the device driver's pm-\u003efreeze() callback, if defined, instead of pm-\u003esuspend(),\nDocumentation/power/pci.rst-577-and it doesn't apply the suspend-related hardware quirks.  It is executed\n--\nDocumentation/power/pci.rst=581=The pci_pm_freeze_noirq() routine, in turn, is similar to\nDocumentation/power/pci.rst:582:pci_pm_suspend_noirq(), but it calls the device driver's pm-\u003efreeze_noirq()\nDocumentation/power/pci.rst-583-routine instead of pm-\u003esuspend_noirq().  It also doesn't attempt to prepare the\n--\nDocumentation/power/runtime_pm.rst=729=driver/base/power/generic_ops.c:\n--\nDocumentation/power/runtime_pm.rst-756-  `int pm_generic_freeze(struct device *dev);`\nDocumentation/power/runtime_pm.rst:757:    - if the device has not been suspended at run time, invoke the -\u003efreeze()\nDocumentation/power/runtime_pm.rst-758-      callback provided by its driver and return its result, or return 0 if not\n--\nDocumentation/power/runtime_pm.rst-761-  `int pm_generic_freeze_noirq(struct device *dev);`\nDocumentation/power/runtime_pm.rst:762:    - if pm_runtime_suspended(dev) returns \"false\", invoke the -\u003efreeze_noirq()\nDocumentation/power/runtime_pm.rst-763-      callback provided by the device's driver and return its result, or return\n--\nDocumentation/power/runtime_pm.rst=794=provide its own callbacks for -\u003eruntime_idle(), -\u003eruntime_suspend(),\nDocumentation/power/runtime_pm.rst-795--\u003eruntime_resume(), -\u003esuspend(), -\u003esuspend_noirq(), -\u003eresume(),\nDocumentation/power/runtime_pm.rst:796:-\u003eresume_noirq(), -\u003efreeze(), -\u003efreeze_noirq(), -\u003ethaw(), -\u003ethaw_noirq(),\nDocumentation/power/runtime_pm.rst-797--\u003epoweroff(), -\u003epoweroff_noirq(), -\u003erestore(), -\u003erestore_noirq() in the\n--\narch/powerpc/kernel/eeh_driver.c=630=static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus,\n--\narch/powerpc/kernel/eeh_driver.c-643-\t/* pcibios will clear the counter; save the value */\narch/powerpc/kernel/eeh_driver.c:644:\tcnt = pe-\u003efreeze_count;\narch/powerpc/kernel/eeh_driver.c-645-\ttstamp = pe-\u003etstamp;\n--\narch/powerpc/kernel/eeh_driver.c-711-\tpe-\u003etstamp = tstamp;\narch/powerpc/kernel/eeh_driver.c:712:\tpe-\u003efreeze_count = cnt;\narch/powerpc/kernel/eeh_driver.c-713-\n--\narch/powerpc/kernel/eeh_driver.c=836=void eeh_handle_normal_event(struct eeh_pe *pe)\n--\narch/powerpc/kernel/eeh_driver.c-925-\teeh_pe_update_time_stamp(pe);\narch/powerpc/kernel/eeh_driver.c:926:\tpe-\u003efreeze_count++;\narch/powerpc/kernel/eeh_driver.c:927:\tif (pe-\u003efreeze_count \u003e eeh_max_freezes) {\narch/powerpc/kernel/eeh_driver.c-928-\t\tpr_err(\"EEH: PHB#%x-PE#%x has failed %d times in the last hour and has been permanently disabled.\\n\",\narch/powerpc/kernel/eeh_driver.c-929-\t\t       pe-\u003ephb-\u003eglobal_number, pe-\u003eaddr,\narch/powerpc/kernel/eeh_driver.c:930:\t\t       pe-\u003efreeze_count);\narch/powerpc/kernel/eeh_driver.c-931-\n--\narch/powerpc/kernel/eeh_driver.c-945-\tpr_warn(\"EEH: This PCI device has failed %d times in the last hour and will be permanently disabled after %d failures.\\n\",\narch/powerpc/kernel/eeh_driver.c:946:\t\tpe-\u003efreeze_count, eeh_max_freezes);\narch/powerpc/kernel/eeh_driver.c-947-\tpr_info(\"EEH: Notify device drivers to shutdown\\n\");\n--\narch/powerpc/kernel/eeh_pe.c=490=void eeh_pe_update_time_stamp(struct eeh_pe *pe)\n--\narch/powerpc/kernel/eeh_pe.c-495-\narch/powerpc/kernel/eeh_pe.c:496:\tif (pe-\u003efreeze_count \u003c= 0) {\narch/powerpc/kernel/eeh_pe.c:497:\t\tpe-\u003efreeze_count = 0;\narch/powerpc/kernel/eeh_pe.c-498-\t\tpe-\u003etstamp = ktime_get_seconds();\n--\narch/powerpc/kernel/eeh_pe.c-502-\t\t\tpe-\u003etstamp = tstamp;\narch/powerpc/kernel/eeh_pe.c:503:\t\t\tpe-\u003efreeze_count = 0;\narch/powerpc/kernel/eeh_pe.c-504-\t\t}\n--\narch/powerpc/platforms/85xx/smp.c=47=static void mpc85xx_give_timebase(void)\n--\narch/powerpc/platforms/85xx/smp.c-57-\narch/powerpc/platforms/85xx/smp.c:58:\tqoriq_pm_ops-\u003efreeze_time_base(true);\narch/powerpc/platforms/85xx/smp.c-59-#ifdef CONFIG_PPC64\n--\narch/powerpc/platforms/85xx/smp.c-90-\narch/powerpc/platforms/85xx/smp.c:91:\tqoriq_pm_ops-\u003efreeze_time_base(false);\narch/powerpc/platforms/85xx/smp.c-92-\n--\narch/powerpc/platforms/powernv/eeh-powernv.c=453=static int pnv_eeh_set_option(struct eeh_pe *pe, int option)\n--\narch/powerpc/platforms/powernv/eeh-powernv.c-482-\tif (freeze_pe) {\narch/powerpc/platforms/powernv/eeh-powernv.c:483:\t\tif (phb-\u003efreeze_pe) {\narch/powerpc/platforms/powernv/eeh-powernv.c:484:\t\t\tphb-\u003efreeze_pe(phb, pe-\u003eaddr);\narch/powerpc/platforms/powernv/eeh-powernv.c-485-\t\t\treturn 0;\n--\narch/powerpc/platforms/powernv/eeh-powernv.c=565=static int pnv_eeh_get_pe_state(struct eeh_pe *pe)\n--\narch/powerpc/platforms/powernv/eeh-powernv.c-653-\t    !(pe-\u003estate \u0026 EEH_PE_ISOLATED)) {\narch/powerpc/platforms/powernv/eeh-powernv.c:654:\t\tif (phb-\u003efreeze_pe)\narch/powerpc/platforms/powernv/eeh-powernv.c:655:\t\t\tphb-\u003efreeze_pe(phb, pe-\u003eaddr);\narch/powerpc/platforms/powernv/eeh-powernv.c-656-\n--\narch/powerpc/platforms/powernv/eeh-powernv.c=1339=static int pnv_eeh_get_pe(struct pci_controller *hose,\n--\narch/powerpc/platforms/powernv/eeh-powernv.c-1366-\tif (!(dev_pe-\u003estate \u0026 EEH_PE_ISOLATED))\narch/powerpc/platforms/powernv/eeh-powernv.c:1367:\t\tphb-\u003efreeze_pe(phb, pe_no);\narch/powerpc/platforms/powernv/eeh-powernv.c-1368-\n--\narch/powerpc/platforms/powernv/eeh-powernv.c-1385-\t\tif (!(dev_pe-\u003estate \u0026 EEH_PE_ISOLATED))\narch/powerpc/platforms/powernv/eeh-powernv.c:1386:\t\t\tphb-\u003efreeze_pe(phb, dev_pe-\u003eaddr);\narch/powerpc/platforms/powernv/eeh-powernv.c-1387-\n--\narch/powerpc/platforms/powernv/pci-ioda.c=2485=static void __init pnv_pci_init_ioda_phb(struct device_node *np,\n--\narch/powerpc/platforms/powernv/pci-ioda.c-2665-\tphb-\u003eget_pe_state = pnv_ioda_get_pe_state;\narch/powerpc/platforms/powernv/pci-ioda.c:2666:\tphb-\u003efreeze_pe = pnv_ioda_freeze_pe;\narch/powerpc/platforms/powernv/pci-ioda.c-2667-\tphb-\u003eunfreeze_pe = pnv_ioda_unfreeze_pe;\n--\narch/powerpc/platforms/powernv/pci.c=527=static void pnv_pci_config_check_eeh(struct pci_dn *pdn)\n--\narch/powerpc/platforms/powernv/pci.c-574-\t\t */\narch/powerpc/platforms/powernv/pci.c:575:\t\tif (phb-\u003efreeze_pe)\narch/powerpc/platforms/powernv/pci.c:576:\t\t\tphb-\u003efreeze_pe(phb, pe_no);\narch/powerpc/platforms/powernv/pci.c-577-\n--\nblock/bdev.c=301=int bdev_freeze(struct block_device *bdev)\n--\nblock/bdev.c-312-\tmutex_lock(\u0026bdev-\u003ebd_holder_lock);\nblock/bdev.c:313:\tif (bdev-\u003ebd_holder_ops \u0026\u0026 bdev-\u003ebd_holder_ops-\u003efreeze) {\nblock/bdev.c:314:\t\terror = bdev-\u003ebd_holder_ops-\u003efreeze(bdev);\nblock/bdev.c-315-\t\tlockdep_assert_not_held(\u0026bdev-\u003ebd_holder_lock);\n--\ndrivers/android/binder.c=1182=static void binder_cleanup_ref_olocked(struct binder_ref *ref)\n--\ndrivers/android/binder.c-1224-\ndrivers/android/binder.c:1225:\tif (ref-\u003efreeze) {\ndrivers/android/binder.c:1226:\t\tbinder_dequeue_work(ref-\u003eproc, \u0026ref-\u003efreeze-\u003ework);\ndrivers/android/binder.c-1227-\t\tbinder_stats_deleted(BINDER_STAT_FREEZE);\n--\ndrivers/android/binder.c=1352=static void binder_free_ref(struct binder_ref *ref)\n--\ndrivers/android/binder.c-1356-\tkfree(ref-\u003edeath);\ndrivers/android/binder.c:1357:\tkfree(ref-\u003efreeze);\ndrivers/android/binder.c-1358-\tkfree(ref);\n--\ndrivers/android/binder.c=1659=static void binder_free_transaction(struct binder_transaction *t)\n--\ndrivers/android/binder.c-1682-\t\tif (!target_proc-\u003eoutstanding_txns \u0026\u0026 target_proc-\u003eis_frozen)\ndrivers/android/binder.c:1683:\t\t\twake_up_interruptible_all(\u0026target_proc-\u003efreeze_wait);\ndrivers/android/binder.c-1684-\t\tif (t-\u003ebuffer)\n--\ndrivers/android/binder.c=3937=binder_request_freeze_notification(struct binder_proc *proc,\n--\ndrivers/android/binder.c-3957-\tbinder_node_lock(ref-\u003enode);\ndrivers/android/binder.c:3958:\tif (ref-\u003efreeze) {\ndrivers/android/binder.c-3959-\t\tbinder_user_error(\"%d:%d BC_REQUEST_FREEZE_NOTIFICATION already set\\n\",\n--\ndrivers/android/binder.c-3970-\tfreeze-\u003ework.type = BINDER_WORK_FROZEN_BINDER;\ndrivers/android/binder.c:3971:\tref-\u003efreeze = freeze;\ndrivers/android/binder.c-3972-\n--\ndrivers/android/binder.c=3990=binder_clear_freeze_notification(struct binder_proc *proc,\n--\ndrivers/android/binder.c-4007-\ndrivers/android/binder.c:4008:\tif (!ref-\u003efreeze) {\ndrivers/android/binder.c-4009-\t\tbinder_user_error(\"%d:%d BC_CLEAR_FREEZE_NOTIFICATION freeze notification not active\\n\",\n--\ndrivers/android/binder.c-4014-\t}\ndrivers/android/binder.c:4015:\tfreeze = ref-\u003efreeze;\ndrivers/android/binder.c-4016-\tbinder_inner_proc_lock(proc);\n--\ndrivers/android/binder.c-4025-\t}\ndrivers/android/binder.c:4026:\tref-\u003efreeze = NULL;\ndrivers/android/binder.c-4027-\t/*\n--\ndrivers/android/binder.c=5640=static void binder_add_freeze_work(struct binder_proc *proc, bool is_frozen)\n--\ndrivers/android/binder.c-5663-\t\t\tbinder_inner_proc_lock(ref-\u003eproc);\ndrivers/android/binder.c:5664:\t\t\tif (!ref-\u003efreeze) {\ndrivers/android/binder.c-5665-\t\t\t\tbinder_inner_proc_unlock(ref-\u003eproc);\n--\ndrivers/android/binder.c-5667-\t\t\t}\ndrivers/android/binder.c:5668:\t\t\tref-\u003efreeze-\u003ework.type = BINDER_WORK_FROZEN_BINDER;\ndrivers/android/binder.c:5669:\t\t\tif (list_empty(\u0026ref-\u003efreeze-\u003ework.entry)) {\ndrivers/android/binder.c:5670:\t\t\t\tref-\u003efreeze-\u003eis_frozen = is_frozen;\ndrivers/android/binder.c:5671:\t\t\t\tbinder_enqueue_work_ilocked(\u0026ref-\u003efreeze-\u003ework, \u0026ref-\u003eproc-\u003etodo);\ndrivers/android/binder.c-5672-\t\t\t\tbinder_wakeup_proc_ilocked(ref-\u003eproc);\ndrivers/android/binder.c-5673-\t\t\t} else {\ndrivers/android/binder.c:5674:\t\t\t\tif (ref-\u003efreeze-\u003esent \u0026\u0026 ref-\u003efreeze-\u003eis_frozen != is_frozen)\ndrivers/android/binder.c:5675:\t\t\t\t\tref-\u003efreeze-\u003eresend = true;\ndrivers/android/binder.c:5676:\t\t\t\tref-\u003efreeze-\u003eis_frozen = is_frozen;\ndrivers/android/binder.c-5677-\t\t\t}\n--\ndrivers/android/binder.c=5691=static int binder_ioctl_freeze(struct binder_freeze_info *info,\n--\ndrivers/android/binder.c-5718-\t\tret = wait_event_interruptible_timeout(\ndrivers/android/binder.c:5719:\t\t\ttarget_proc-\u003efreeze_wait,\ndrivers/android/binder.c-5720-\t\t\t(!target_proc-\u003eoutstanding_txns),\n--\ndrivers/android/binder.c=6067=static int binder_open(struct inode *nodp, struct file *filp)\n--\ndrivers/android/binder.c-6088-\tINIT_LIST_HEAD(\u0026proc-\u003etodo);\ndrivers/android/binder.c:6089:\tinit_waitqueue_head(\u0026proc-\u003efreeze_wait);\ndrivers/android/binder.c-6090-\tproc-\u003edefault_priority = task_nice(current);\n--\ndrivers/ata/libahci_platform.c=798=void ahci_platform_shutdown(struct platform_device *pdev)\n--\ndrivers/ata/libahci_platform.c-808-\t\t/* Disable port interrupts */\ndrivers/ata/libahci_platform.c:809:\t\tif (ap-\u003eops-\u003efreeze)\ndrivers/ata/libahci_platform.c:810:\t\t\tap-\u003eops-\u003efreeze(ap);\ndrivers/ata/libahci_platform.c-811-\n--\ndrivers/ata/libata-core.c=6395=void ata_pci_shutdown_one(struct pci_dev *pdev)\n--\ndrivers/ata/libata-core.c-6405-\t\t/* Disable port interrupts */\ndrivers/ata/libata-core.c:6406:\t\tif (ap-\u003eops-\u003efreeze)\ndrivers/ata/libata-core.c:6407:\t\t\tap-\u003eops-\u003efreeze(ap);\ndrivers/ata/libata-core.c-6408-\n--\ndrivers/ata/libata-eh.c=1110=EXPORT_SYMBOL_GPL(ata_port_abort);\n--\ndrivers/ata/libata-eh.c-1120- *\ndrivers/ata/libata-eh.c:1121: *\tap-\u003eops-\u003efreeze() callback can be used for freezing the port\ndrivers/ata/libata-eh.c-1122- *\thardware-wise (e.g. mask interrupt and stop DMA engine).  If a\n--\ndrivers/ata/libata-eh.c=1130=static void __ata_port_freeze(struct ata_port *ap)\ndrivers/ata/libata-eh.c-1131-{\ndrivers/ata/libata-eh.c:1132:\tif (ap-\u003eops-\u003efreeze)\ndrivers/ata/libata-eh.c:1133:\t\tap-\u003eops-\u003efreeze(ap);\ndrivers/ata/libata-eh.c-1134-\n--\ndrivers/ata/sata_promise.c=183=static struct ata_port_operations pdc_sata_ops = {\n--\ndrivers/ata/sata_promise.c-194-/* First-generation chips need a more restrictive -\u003echeck_atapi_dma op,\ndrivers/ata/sata_promise.c:195:   and -\u003efreeze/thaw that ignore the hotplug controls. */\ndrivers/ata/sata_promise.c-196-static struct ata_port_operations pdc_old_sata_ops = {\n--\ndrivers/ata/sata_promise.c=706=static void pdc_sata_freeze(struct ata_port *ap)\n--\ndrivers/ata/sata_promise.c-718-\t * 2) ap-\u003elock == \u0026ap-\u003ehost-\u003elock\ndrivers/ata/sata_promise.c:719:\t * 3) -\u003efreeze() and -\u003ethaw() are called with ap-\u003elock held\ndrivers/ata/sata_promise.c-720-\t */\n--\ndrivers/base/platform.c=1227=int platform_pm_freeze(struct device *dev)\n--\ndrivers/base/platform.c-1235-\tif (drv-\u003epm) {\ndrivers/base/platform.c:1236:\t\tif (drv-\u003epm-\u003efreeze)\ndrivers/base/platform.c:1237:\t\t\tret = drv-\u003epm-\u003efreeze(dev);\ndrivers/base/platform.c-1238-\t} else {\n--\ndrivers/base/power/main.c=366=static pm_callback_t pm_op(const struct dev_pm_ops *ops, pm_message_t state)\n--\ndrivers/base/power/main.c-377-\tcase PM_EVENT_QUIESCE:\ndrivers/base/power/main.c:378:\t\treturn ops-\u003efreeze;\ndrivers/base/power/main.c-379-\tcase PM_EVENT_POWEROFF:\n--\ndrivers/base/power/main.c=400=static pm_callback_t pm_late_early_op(const struct dev_pm_ops *ops,\n--\ndrivers/base/power/main.c-412-\tcase PM_EVENT_QUIESCE:\ndrivers/base/power/main.c:413:\t\treturn ops-\u003efreeze_late;\ndrivers/base/power/main.c-414-\tcase PM_EVENT_POWEROFF:\n--\ndrivers/base/power/main.c=436=static pm_callback_t pm_noirq_op(const struct dev_pm_ops *ops, pm_message_t state)\n--\ndrivers/base/power/main.c-447-\tcase PM_EVENT_QUIESCE:\ndrivers/base/power/main.c:448:\t\treturn ops-\u003efreeze_noirq;\ndrivers/base/power/main.c-449-\tcase PM_EVENT_POWEROFF:\n--\ndrivers/gpu/host1x/dev.h=307=static inline void host1x_hw_cdma_freeze(struct host1x *host,\n--\ndrivers/gpu/host1x/dev.h-309-{\ndrivers/gpu/host1x/dev.h:310:\thost-\u003ecdma_op-\u003efreeze(cdma);\ndrivers/gpu/host1x/dev.h-311-}\n--\ndrivers/infiniband/hw/hfi1/chip.c=6730=void start_freeze_handling(struct hfi1_pportdata *ppd, int flags)\n--\ndrivers/infiniband/hw/hfi1/chip.c-6763-\t/* queue non-interrupt handler */\ndrivers/infiniband/hw/hfi1/chip.c:6764:\tqueue_work(ppd-\u003ehfi1_wq, \u0026ppd-\u003efreeze_work);\ndrivers/infiniband/hw/hfi1/chip.c-6765-}\n--\ndrivers/infiniband/hw/hfi1/chip.c=9871=void hfi1_quiet_serdes(struct hfi1_pportdata *ppd)\n--\ndrivers/infiniband/hw/hfi1/chip.c-9896-\tclear_rcvctrl(dd, RCV_CTRL_RCV_PORT_ENABLE_SMASK);\ndrivers/infiniband/hw/hfi1/chip.c:9897:\tcancel_work_sync(\u0026ppd-\u003efreeze_work);\ndrivers/infiniband/hw/hfi1/chip.c-9898-}\n--\ndrivers/infiniband/hw/hfi1/init.c=588=void hfi1_init_pportdata(struct pci_dev *pdev, struct hfi1_pportdata *ppd,\n--\ndrivers/infiniband/hw/hfi1/init.c-616-\tINIT_WORK(\u0026ppd-\u003elink_down_work, handle_link_down);\ndrivers/infiniband/hw/hfi1/init.c:617:\tINIT_WORK(\u0026ppd-\u003efreeze_work, handle_freeze);\ndrivers/infiniband/hw/hfi1/init.c-618-\tINIT_WORK(\u0026ppd-\u003elink_downgrade_work, handle_link_downgrade);\n--\ndrivers/infiniband/hw/irdma/ctrl.c=2753=static int irdma_sc_qp_upload_context(struct irdma_sc_dev *dev,\n--\ndrivers/infiniband/hw/irdma/ctrl.c-2771-\t      FIELD_PREP(IRDMA_CQPSQ_UCTX_RAWFORMAT, info-\u003eraw_format) |\ndrivers/infiniband/hw/irdma/ctrl.c:2772:\t      FIELD_PREP(IRDMA_CQPSQ_UCTX_FREEZEQP, info-\u003efreeze_qp) |\ndrivers/infiniband/hw/irdma/ctrl.c-2773-\t      FIELD_PREP(IRDMA_CQPSQ_WQEVALID, cqp-\u003epolarity);\n--\ndrivers/net/dsa/microchip/ksz9477.c=385=void ksz9477_r_mib_cnt(struct ksz_device *dev, int port, u16 addr, u64 *cnt)\n--\ndrivers/net/dsa/microchip/ksz9477.c-392-\t/* retain the flush/freeze bit */\ndrivers/net/dsa/microchip/ksz9477.c:393:\tdata = p-\u003efreeze ? MIB_COUNTER_FLUSH_FREEZE : 0;\ndrivers/net/dsa/microchip/ksz9477.c-394-\tdata |= MIB_COUNTER_READ;\n--\ndrivers/net/dsa/microchip/ksz9477.c=419=void ksz9477_freeze_mib(struct ksz_device *dev, int port, bool freeze)\n--\ndrivers/net/dsa/microchip/ksz9477.c-428-\t/* used by MIB counter reading code to know freeze is enabled */\ndrivers/net/dsa/microchip/ksz9477.c:429:\tp-\u003efreeze = freeze;\ndrivers/net/dsa/microchip/ksz9477.c-430-\tmutex_unlock(\u0026p-\u003emib.cnt_mutex);\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c=1371=int mlxsw_sp_sb_pool_set(struct mlxsw_core *mlxsw_core,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1389-\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c:1390:\tif (pr-\u003efreeze_mode \u0026\u0026 pr-\u003emode != mode) {\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1391-\t\tNL_SET_ERR_MSG_MOD(extack, \"Changing this pool's threshold type is forbidden\");\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1394-\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c:1395:\tif (pr-\u003efreeze_size \u0026\u0026 pr-\u003esize != size) {\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1396-\t\tNL_SET_ERR_MSG_MOD(extack, \"Changing this pool's size is forbidden\");\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c=1499=int mlxsw_sp_sb_tc_pool_bind_set(struct mlxsw_core_port *mlxsw_core_port,\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1529-\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c:1530:\tif (cm-\u003efreeze_pool \u0026\u0026 cm-\u003epool_index != pool_index) {\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1531-\t\tNL_SET_ERR_MSG_MOD(extack, \"Binding this TC to a different pool is forbidden\");\n--\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1534-\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c:1535:\tif (cm-\u003efreeze_thresh \u0026\u0026 cm-\u003emax_buff != threshold) {\ndrivers/net/ethernet/mellanox/mlxsw/spectrum_buffers.c-1536-\t\tNL_SET_ERR_MSG_MOD(extack, \"Changing this TC's threshold is forbidden\");\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=792=static int brcmf_sdiod_freezer_attach(struct brcmf_sdio_dev *sdiodev)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-796-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:797:\tsdiodev-\u003efreezer = kzalloc_obj(*sdiodev-\u003efreezer);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:798:\tif (!sdiodev-\u003efreezer)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-799-\t\treturn -ENOMEM;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:800:\tatomic_set(\u0026sdiodev-\u003efreezer-\u003ethread_count, 0);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:801:\tatomic_set(\u0026sdiodev-\u003efreezer-\u003efreezing, 0);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:802:\tinit_waitqueue_head(\u0026sdiodev-\u003efreezer-\u003ethread_freeze);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:803:\tinit_completion(\u0026sdiodev-\u003efreezer-\u003eresumed);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-804-\treturn 0;\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=807=static void brcmf_sdiod_freezer_detach(struct brcmf_sdio_dev *sdiodev)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-808-{\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:809:\tif (sdiodev-\u003efreezer) {\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:810:\t\tWARN_ON(atomic_read(\u0026sdiodev-\u003efreezer-\u003efreezing));\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:811:\t\tkfree(sdiodev-\u003efreezer);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:812:\t\tsdiodev-\u003efreezer = NULL;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-813-\t}\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=816=static int brcmf_sdiod_freezer_on(struct brcmf_sdio_dev *sdiodev)\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-817-{\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:818:\tatomic_t *expect = \u0026sdiodev-\u003efreezer-\u003ethread_count;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-819-\tint res = 0;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-820-\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:821:\tsdiodev-\u003efreezer-\u003efrozen_count = 0;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:822:\treinit_completion(\u0026sdiodev-\u003efreezer-\u003eresumed);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:823:\tatomic_set(\u0026sdiodev-\u003efreezer-\u003efreezing, 1);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-824-\tbrcmf_sdio_trigger_dpc(sdiodev-\u003ebus);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:825:\twait_event(sdiodev-\u003efreezer-\u003ethread_freeze,\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:826:\t\t   atomic_read(expect) == sdiodev-\u003efreezer-\u003efrozen_count);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-827-\tsdio_claim_host(sdiodev-\u003efunc1);\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=833=static void brcmf_sdiod_freezer_off(struct brcmf_sdio_dev *sdiodev)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-837-\tsdio_release_host(sdiodev-\u003efunc1);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:838:\tatomic_set(\u0026sdiodev-\u003efreezer-\u003efreezing, 0);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:839:\tcomplete_all(\u0026sdiodev-\u003efreezer-\u003eresumed);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-840-}\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=842=bool brcmf_sdiod_freezing(struct brcmf_sdio_dev *sdiodev)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-844-\treturn IS_ENABLED(CONFIG_PM_SLEEP) \u0026\u0026\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:845:\t\tatomic_read(\u0026sdiodev-\u003efreezer-\u003efreezing);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-846-}\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=848=void brcmf_sdiod_try_freeze(struct brcmf_sdio_dev *sdiodev)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-851-\t\treturn;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:852:\tsdiodev-\u003efreezer-\u003efrozen_count++;\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:853:\twake_up(\u0026sdiodev-\u003efreezer-\u003ethread_freeze);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:854:\twait_for_completion(\u0026sdiodev-\u003efreezer-\u003eresumed);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-855-}\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=857=void brcmf_sdiod_freezer_count(struct brcmf_sdio_dev *sdiodev)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-859-\tif (IS_ENABLED(CONFIG_PM_SLEEP))\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:860:\t\tatomic_inc(\u0026sdiodev-\u003efreezer-\u003ethread_count);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-861-}\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c=863=void brcmf_sdiod_freezer_uncount(struct brcmf_sdio_dev *sdiodev)\n--\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-865-\tif (IS_ENABLED(CONFIG_PM_SLEEP))\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c:866:\t\tatomic_dec(\u0026sdiodev-\u003efreezer-\u003ethread_count);\ndrivers/net/wireless/broadcom/brcm80211/brcmfmac/bcmsdh.c-867-}\n--\ndrivers/net/wireless/realtek/rtw88/coex.c=2548=static void rtw_coex_run_coex(struct rtw_dev *rtwdev, u8 reason)\n--\ndrivers/net/wireless/realtek/rtw88/coex.c-2588-\ndrivers/net/wireless/realtek/rtw88/coex.c:2589:\tif (coex-\u003efreeze \u0026\u0026 coex_dm-\u003ereason == COEX_RSN_BTINFO \u0026\u0026\ndrivers/net/wireless/realtek/rtw88/coex.c-2590-\t    !coex_stat-\u003ebt_setup_link) {\n--\ndrivers/net/wireless/realtek/rtw88/coex.c=2708=static void __rtw_coex_init_hw_config(struct rtw_dev *rtwdev, bool wifi_only)\n--\ndrivers/net/wireless/realtek/rtw88/coex.c-2753-\t\tcoex-\u003estop_dm = false;\ndrivers/net/wireless/realtek/rtw88/coex.c:2754:\t\tcoex-\u003efreeze = true;\ndrivers/net/wireless/realtek/rtw88/coex.c-2755-\t}\n--\ndrivers/net/wireless/realtek/rtw88/coex.c=2869=void rtw_coex_scan_notify(struct rtw_dev *rtwdev, u8 type)\n--\ndrivers/net/wireless/realtek/rtw88/coex.c-2876-\ndrivers/net/wireless/realtek/rtw88/coex.c:2877:\tcoex-\u003efreeze = false;\ndrivers/net/wireless/realtek/rtw88/coex.c-2878-\trtw_coex_write_scbd(rtwdev, COEX_SCBD_ACTIVE | COEX_SCBD_ONOFF, true);\n--\ndrivers/net/wireless/realtek/rtw88/coex.c=2933=void rtw_coex_connect_notify(struct rtw_dev *rtwdev, u8 type)\n--\ndrivers/net/wireless/realtek/rtw88/coex.c-2972-\t\t */\ndrivers/net/wireless/realtek/rtw88/coex.c:2973:\t\tcoex-\u003efreeze = true;\ndrivers/net/wireless/realtek/rtw88/coex.c-2974-\t\tieee80211_queue_delayed_work(rtwdev-\u003ehw, \u0026coex-\u003edefreeze_work,\n--\ndrivers/net/wireless/realtek/rtw88/coex.c-2977-\t\tcoex_stat-\u003ewl_hi_pri_task1 = false;\ndrivers/net/wireless/realtek/rtw88/coex.c:2978:\t\tcoex-\u003efreeze = false;\ndrivers/net/wireless/realtek/rtw88/coex.c-2979-\t\tcoex_stat-\u003ewl_connecting = false;\n--\ndrivers/net/wireless/realtek/rtw88/coex.c=3491=void rtw_coex_defreeze_work(struct work_struct *work)\n--\ndrivers/net/wireless/realtek/rtw88/coex.c-3498-\tmutex_lock(\u0026rtwdev-\u003emutex);\ndrivers/net/wireless/realtek/rtw88/coex.c:3499:\tcoex-\u003efreeze = false;\ndrivers/net/wireless/realtek/rtw88/coex.c-3500-\tcoex_stat-\u003ewl_hi_pri_task1 = false;\n--\ndrivers/net/wireless/realtek/rtw88/coex.c=3936=void rtw_coex_display_coex_info(struct rtw_dev *rtwdev, struct seq_file *m)\n--\ndrivers/net/wireless/realtek/rtw88/coex.c-3995-\ndrivers/net/wireless/realtek/rtw88/coex.c:3996:\t} else if (coex-\u003efreeze) {\ndrivers/net/wireless/realtek/rtw88/coex.c-3997-\t\tseq_puts(m, \"============[coex_freeze]============\\n\");\n--\ndrivers/nvdimm/dimm_devs.c=410=static umode_t nvdimm_visible(struct kobject *kobj, struct attribute *a, int n)\n--\ndrivers/nvdimm/dimm_devs.c-421-\t\t/* Are there any state mutation ops (make writable)? */\ndrivers/nvdimm/dimm_devs.c:422:\t\tif (nvdimm-\u003esec.ops-\u003efreeze || nvdimm-\u003esec.ops-\u003edisable\ndrivers/nvdimm/dimm_devs.c-423-\t\t\t\t|| nvdimm-\u003esec.ops-\u003echange_key\n--\ndrivers/nvdimm/dimm_devs.c-429-\ndrivers/nvdimm/dimm_devs.c:430:\tif (nvdimm-\u003esec.ops-\u003efreeze)\ndrivers/nvdimm/dimm_devs.c-431-\t\treturn a-\u003emode;\n--\ndrivers/nvdimm/dimm_devs.c=670=int nvdimm_security_freeze(struct nvdimm *nvdimm)\n--\ndrivers/nvdimm/dimm_devs.c-675-\ndrivers/nvdimm/dimm_devs.c:676:\tif (!nvdimm-\u003esec.ops || !nvdimm-\u003esec.ops-\u003efreeze)\ndrivers/nvdimm/dimm_devs.c-677-\t\treturn -EOPNOTSUPP;\n--\ndrivers/nvdimm/dimm_devs.c-686-\ndrivers/nvdimm/dimm_devs.c:687:\trc = nvdimm-\u003esec.ops-\u003efreeze(nvdimm);\ndrivers/nvdimm/dimm_devs.c-688-\tnvdimm-\u003esec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);\n--\ndrivers/pci/pci-driver.c=1063=static int pci_pm_freeze(struct device *dev)\n--\ndrivers/pci/pci-driver.c-1088-\ndrivers/pci/pci-driver.c:1089:\tif (pm-\u003efreeze) {\ndrivers/pci/pci-driver.c-1090-\t\tint error;\ndrivers/pci/pci-driver.c-1091-\ndrivers/pci/pci-driver.c:1092:\t\terror = pm-\u003efreeze(dev);\ndrivers/pci/pci-driver.c:1093:\t\tsuspend_report_result(dev, pm-\u003efreeze, error);\ndrivers/pci/pci-driver.c-1094-\t\tif (error)\n--\ndrivers/pci/pci-driver.c=1101=static int pci_pm_freeze_noirq(struct device *dev)\n--\ndrivers/pci/pci-driver.c-1108-\ndrivers/pci/pci-driver.c:1109:\tif (pm \u0026\u0026 pm-\u003efreeze_noirq) {\ndrivers/pci/pci-driver.c-1110-\t\tint error;\ndrivers/pci/pci-driver.c-1111-\ndrivers/pci/pci-driver.c:1112:\t\terror = pm-\u003efreeze_noirq(dev);\ndrivers/pci/pci-driver.c:1113:\t\tsuspend_report_result(dev, pm-\u003efreeze_noirq, error);\ndrivers/pci/pci-driver.c-1114-\t\tif (error)\n--\ndrivers/scsi/scsi_pm.c=27=static int do_scsi_freeze(struct device *dev, const struct dev_pm_ops *pm)\ndrivers/scsi/scsi_pm.c-28-{\n\n"
}

gemini-3.1-pro-preview

null

null

							input: 17494
							output: 18
							thoughts: 60
						

**Tracing the Freezing Logic**

Okay, so I'm looking into this patch in `fs/super.c`. It seems to be related to `fs_bdev_freeze`, which is interesting. Wait a minute, where is *that* called from? Right, `fs_bdev_freeze` is invoked by `bdev_freeze`. That's in `block/bdev.c`. Alright, so let's shift gears and dive into `bdev_freeze`. I need to understand the control flow here to see the broader implications of the change. Time to dig in and see what's actually going on in that function.

{
  "Expression": "bdev_freeze"
}

{
  "Output": "block/bdev.c=285=EXPORT_SYMBOL(sync_blockdev_range);\n--\nblock/bdev.c-287-/**\nblock/bdev.c:288: * bdev_freeze - lock a filesystem and force it into a consistent state\nblock/bdev.c-289- * @bdev:\tblockdevice to lock\n--\nblock/bdev.c-294- * unfreeze process can unfreeze the frozen filesystem actually when multiple\nblock/bdev.c:295: * freeze requests arrive simultaneously. It counts up in bdev_freeze() and\nblock/bdev.c-296- * count down in bdev_thaw(). When it becomes 0, thaw_bdev() will unfreeze\n--\nblock/bdev.c-300- */\nblock/bdev.c:301:int bdev_freeze(struct block_device *bdev)\nblock/bdev.c-302-{\n--\nblock/bdev.c-326-}\nblock/bdev.c:327:EXPORT_SYMBOL(bdev_freeze);\nblock/bdev.c-328-\n--\nblock/bdev.c-332- *\nblock/bdev.c:333: * Unlocks the filesystem and marks it writeable again after bdev_freeze().\nblock/bdev.c-334- *\n--\ndrivers/md/dm.c=2932=static int lock_fs(struct mapped_device *md)\n--\ndrivers/md/dm.c-2937-\ndrivers/md/dm.c:2938:\tr = bdev_freeze(md-\u003edisk-\u003epart0);\ndrivers/md/dm.c-2939-\tif (!r)\n--\nfs/exfat/super.c=155=int exfat_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/exfat/super.c-166-\tcase EXFAT_GOING_DOWN_FULLSYNC:\nfs/exfat/super.c:167:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/exfat/super.c-168-\t\tif (ret)\n--\nfs/ext4/ioctl.c=810=int ext4_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/ext4/ioctl.c-825-\tcase EXT4_GOING_FLAGS_DEFAULT:\nfs/ext4/ioctl.c:826:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/ext4/ioctl.c-827-\t\tif (ret)\n--\nfs/f2fs/file.c=2453=int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,\n--\nfs/f2fs/file.c-2460-\tcase F2FS_GOING_DOWN_FULLSYNC:\nfs/f2fs/file.c:2461:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/f2fs/file.c-2462-\t\tif (ret)\n--\nfs/ntfs/super.c=1820=int ntfs_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/ntfs/super.c-1830-\tcase FS_SHUTDOWN_FLAGS_LOGFLUSH:\nfs/ntfs/super.c:1831:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/ntfs/super.c-1832-\t\tif (ret)\n--\nfs/ntfs3/file.c=197=static int ntfs_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/ntfs3/file.c-205-\t/* No additional options yet (flags). */\nfs/ntfs3/file.c:206:\terr = bdev_freeze(sb-\u003es_bdev);\nfs/ntfs3/file.c-207-\tif (err)\n--\nfs/super.c=1437=static struct super_block *get_bdev_super(struct block_device *bdev)\n--\nfs/super.c-1452-/**\nfs/super.c:1453: * fs_bdev_freeze - freeze owning filesystem of block device\nfs/super.c-1454- * @bdev: block device\n--\nfs/super.c-1466- */\nfs/super.c:1467:static int fs_bdev_freeze(struct block_device *bdev)\nfs/super.c-1468-{\n--\nfs/super.c=1552=const struct blk_holder_ops fs_holder_ops = {\n--\nfs/super.c-1554-\t.sync\t\t\t= fs_bdev_sync,\nfs/super.c:1555:\t.freeze\t\t\t= fs_bdev_freeze,\nfs/super.c-1556-\t.thaw\t\t\t= fs_bdev_thaw,\n--\nfs/xfs/xfs_fsops.c=451=xfs_fs_goingdown(\n--\nfs/xfs/xfs_fsops.c-456-\tcase XFS_FSOP_GOING_FLAGS_DEFAULT: {\nfs/xfs/xfs_fsops.c:457:\t\tif (!bdev_freeze(mp-\u003em_super-\u003es_bdev)) {\nfs/xfs/xfs_fsops.c-458-\t\t\txfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);\n--\ninclude/linux/blkdev.h=1832=static inline int early_lookup_bdev(const char *pathname, dev_t *dev)\n--\ninclude/linux/blkdev.h-1837-\ninclude/linux/blkdev.h:1838:int bdev_freeze(struct block_device *bdev);\ninclude/linux/blkdev.h-1839-int bdev_thaw(struct block_device *bdev);\n"
}

gemini-3.1-pro-preview

null

null

							input: 19241
							output: 20
							thoughts: 830
						

**Analyzing Potential Fuzzing Targets in the Filesystem Code**

Okay, so I've been looking at some recent changes in the filesystem code, trying to identify promising areas for fuzzing. First, I noticed that `bdev_freeze` is a function called by several filesystem-specific shutdown routines: `exfat_force_shutdown`, `ext4_force_shutdown`, `f2fs_do_shutdown`, `ntfs_force_shutdown`, `xfs_fs_goingdown`, and even indirectly through `lock_fs` in `dm.c`. That's a good starting point.

But the key change is in `fs/super.c`, specifically in `fs_bdev_freeze`. This patch adds error handling after the `sync_blockdev` call. If `sync_blockdev` fails, the superblock is now thawed. This is definitely interesting from a fuzzing perspective because it introduces a new failure path and rollback scenario. This area needs more scrutiny. A synchronization error during freeze/thaw could lead to data corruption or inconsistencies, and it's definitely something that can be targeted by fuzzing.

Next, I looked at a related change in `fs/exfat/misc.c`. This patch modifies how exFAT handles errors when the `errors=remount-ro` option is set. Instead of setting the `SB_RDONLY` flag directly, it now sets `EXFAT_FLAGS_SHUTDOWN`. This change seems subtle but could also introduce new states or code paths that are worth exploring through fuzzing. The comment indicates this change helps avoid potential deadlocks with `freeze_super()`.

So, the focus of my fuzzing efforts should be on `fs_bdev_freeze` and the error handling within it, especially the new rollback path after `sync_blockdev` failure. We want to check `fs_bdev_freeze` because it can be triggered by `FIFREEZE` ioctl, as well as via dm, and the different filesystem shutdown paths. And secondarily, on the error handling in `__exfat_fs_error` to see if there are any race conditions between those functions.

{
  "Expression": "fs_bdev_freeze"
}

{
  "Output": "fs/super.c=1437=static struct super_block *get_bdev_super(struct block_device *bdev)\n--\nfs/super.c-1452-/**\nfs/super.c:1453: * fs_bdev_freeze - freeze owning filesystem of block device\nfs/super.c-1454- * @bdev: block device\n--\nfs/super.c-1466- */\nfs/super.c:1467:static int fs_bdev_freeze(struct block_device *bdev)\nfs/super.c-1468-{\n--\nfs/super.c=1552=const struct blk_holder_ops fs_holder_ops = {\n--\nfs/super.c-1554-\t.sync\t\t\t= fs_bdev_sync,\nfs/super.c:1555:\t.freeze\t\t\t= fs_bdev_freeze,\nfs/super.c-1556-\t.thaw\t\t\t= fs_bdev_thaw,\n"
}

gemini-3.1-pro-preview

null

null

							input: 20813
							output: 18
							thoughts: 98
						

**My Analysis of Filesystem Freezing Behavior**

Okay, so I'm tracing this `fs_bdev_freeze` function. It seems to be triggered through `fs_holder_ops.freeze`. That makes sense, as `fs_holder_ops` are, as I recall, involved when a filesystem interacts with a block device, opening it, likely for I/O. So, the sequence is: we call `bdev_freeze` on the block device itself, which in turn hands control to `fs_bdev_freeze`. The question now is: what actually *calls* `bdev_freeze` in the first place? My gut feeling says it's related to the `FIFREEZE` ioctl. Let me just confirm that hunch; I'll pop over to `block/ioctl.c` to verify that assumption.

{
  "Expression": "bdev_freeze"
}

{
  "Output": "block/bdev.c=285=EXPORT_SYMBOL(sync_blockdev_range);\n--\nblock/bdev.c-287-/**\nblock/bdev.c:288: * bdev_freeze - lock a filesystem and force it into a consistent state\nblock/bdev.c-289- * @bdev:\tblockdevice to lock\n--\nblock/bdev.c-294- * unfreeze process can unfreeze the frozen filesystem actually when multiple\nblock/bdev.c:295: * freeze requests arrive simultaneously. It counts up in bdev_freeze() and\nblock/bdev.c-296- * count down in bdev_thaw(). When it becomes 0, thaw_bdev() will unfreeze\n--\nblock/bdev.c-300- */\nblock/bdev.c:301:int bdev_freeze(struct block_device *bdev)\nblock/bdev.c-302-{\n--\nblock/bdev.c-326-}\nblock/bdev.c:327:EXPORT_SYMBOL(bdev_freeze);\nblock/bdev.c-328-\n--\nblock/bdev.c-332- *\nblock/bdev.c:333: * Unlocks the filesystem and marks it writeable again after bdev_freeze().\nblock/bdev.c-334- *\n--\ndrivers/md/dm.c=2932=static int lock_fs(struct mapped_device *md)\n--\ndrivers/md/dm.c-2937-\ndrivers/md/dm.c:2938:\tr = bdev_freeze(md-\u003edisk-\u003epart0);\ndrivers/md/dm.c-2939-\tif (!r)\n--\nfs/exfat/super.c=155=int exfat_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/exfat/super.c-166-\tcase EXFAT_GOING_DOWN_FULLSYNC:\nfs/exfat/super.c:167:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/exfat/super.c-168-\t\tif (ret)\n--\nfs/ext4/ioctl.c=810=int ext4_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/ext4/ioctl.c-825-\tcase EXT4_GOING_FLAGS_DEFAULT:\nfs/ext4/ioctl.c:826:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/ext4/ioctl.c-827-\t\tif (ret)\n--\nfs/f2fs/file.c=2453=int f2fs_do_shutdown(struct f2fs_sb_info *sbi, unsigned int flag,\n--\nfs/f2fs/file.c-2460-\tcase F2FS_GOING_DOWN_FULLSYNC:\nfs/f2fs/file.c:2461:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/f2fs/file.c-2462-\t\tif (ret)\n--\nfs/ntfs/super.c=1820=int ntfs_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/ntfs/super.c-1830-\tcase FS_SHUTDOWN_FLAGS_LOGFLUSH:\nfs/ntfs/super.c:1831:\t\tret = bdev_freeze(sb-\u003es_bdev);\nfs/ntfs/super.c-1832-\t\tif (ret)\n--\nfs/ntfs3/file.c=197=static int ntfs_force_shutdown(struct super_block *sb, u32 flags)\n--\nfs/ntfs3/file.c-205-\t/* No additional options yet (flags). */\nfs/ntfs3/file.c:206:\terr = bdev_freeze(sb-\u003es_bdev);\nfs/ntfs3/file.c-207-\tif (err)\n--\nfs/super.c=1437=static struct super_block *get_bdev_super(struct block_device *bdev)\n--\nfs/super.c-1452-/**\nfs/super.c:1453: * fs_bdev_freeze - freeze owning filesystem of block device\nfs/super.c-1454- * @bdev: block device\n--\nfs/super.c-1466- */\nfs/super.c:1467:static int fs_bdev_freeze(struct block_device *bdev)\nfs/super.c-1468-{\n--\nfs/super.c=1552=const struct blk_holder_ops fs_holder_ops = {\n--\nfs/super.c-1554-\t.sync\t\t\t= fs_bdev_sync,\nfs/super.c:1555:\t.freeze\t\t\t= fs_bdev_freeze,\nfs/super.c-1556-\t.thaw\t\t\t= fs_bdev_thaw,\n--\nfs/xfs/xfs_fsops.c=451=xfs_fs_goingdown(\n--\nfs/xfs/xfs_fsops.c-456-\tcase XFS_FSOP_GOING_FLAGS_DEFAULT: {\nfs/xfs/xfs_fsops.c:457:\t\tif (!bdev_freeze(mp-\u003em_super-\u003es_bdev)) {\nfs/xfs/xfs_fsops.c-458-\t\t\txfs_force_shutdown(mp, SHUTDOWN_FORCE_UMOUNT);\n--\ninclude/linux/blkdev.h=1832=static inline int early_lookup_bdev(const char *pathname, dev_t *dev)\n--\ninclude/linux/blkdev.h-1837-\ninclude/linux/blkdev.h:1838:int bdev_freeze(struct block_device *bdev);\ninclude/linux/blkdev.h-1839-int bdev_thaw(struct block_device *bdev);\n"
}

gemini-3.1-pro-preview

null

null

							input: 22640
							output: 17
							thoughts: 77
						

Okay, let me break this down.

**Diving into the Freeze Mechanism**

Right, so I'm digging into how freezing works, and it looks like the `FIFREEZE` ioctl in `fs/ioctl.c` *specifically* calls `freeze_super`. That makes sense, targeting the superblock level. But hold on, I recall `bdev_freeze` being in the mix too. Ah yes, I remember now, `bdev_freeze` is definitely used by the device mapper (`dm`) and in filesystem shutdown ioctls - that's a key distinction. Now, the context has shifted a little, I'm thinking about `FIFREEZE` operating directly on a block device - that raises a flag. I need to be sure. So, to get a clear picture I'll need to check the code in `block/ioctl.c`. Let's get the full story.

{
  "Expression": "FIFREEZE"
}

{
  "Output": "Documentation/admin-guide/sysrq.rst=97=Command\t    Function\n--\nDocumentation/admin-guide/sysrq.rst-118-\nDocumentation/admin-guide/sysrq.rst:119:``j``\t    Forcibly \"Just thaw it\" - filesystems frozen by the FIFREEZE ioctl.\nDocumentation/admin-guide/sysrq.rst-120-\n--\nDocumentation/admin-guide/sysrq.rst=211=processes.\n--\nDocumentation/admin-guide/sysrq.rst-213-\"just thaw ``it(j)``\" is useful if your system becomes unresponsive due to a\nDocumentation/admin-guide/sysrq.rst:214:frozen (probably root) filesystem via the FIFREEZE ioctl.\nDocumentation/admin-guide/sysrq.rst-215-\n--\nDocumentation/filesystems/vfs.rst=220=or bottom half).\n--\nDocumentation/filesystems/vfs.rst-292-\tconsistent state.  This method is currently used by the Logical\nDocumentation/filesystems/vfs.rst:293:\tVolume Manager (LVM) and ioctl(FIFREEZE). Optional.\nDocumentation/filesystems/vfs.rst-294-\n--\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst=53=CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE 必须是以 16 进制数写入。\n--\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst-115-\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst:116:``j``\t    强制性的 “解冻它” - 用于被 FIFREEZE ioctl 操作冻住的文件系统。\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst-117-\n--\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst=194=syslogd/klogd 进程是运行的，它们仍将被记录。）\n--\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst-198-\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst:199:\"just thaw ``it(j)`` \" 用于当你的系统由于一个 FIFREEZE ioctl 调用而产生的文件\nDocumentation/translations/zh_CN/admin-guide/sysrq.rst-200-系统冻结，而导致的不响应时。\n--\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst=53=CONFIG_MAGIC_SYSRQ_DEFAULT_ENABLE 必須是以 16 進制數寫入。\n--\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst-115-\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst:116:``j``\t    強制性的 “解凍它” - 用於被 FIFREEZE ioctl 操作凍住的文件系統。\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst-117-\n--\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst=194=syslogd/klogd 進程是運行的，它們仍將被記錄。）\n--\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst-198-\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst:199:\"just thaw ``it(j)`` \" 用於當你的系統由於一個 FIFREEZE ioctl 調用而產生的文件\nDocumentation/translations/zh_TW/admin-guide/sysrq.rst-200-系統凍結，而導致的不響應時。\n--\nfs/ioctl.c=492=static int do_vfs_ioctl(struct file *filp, unsigned int fd,\n--\nfs/ioctl.c-523-\nfs/ioctl.c:524:\tcase FIFREEZE:\nfs/ioctl.c-525-\t\treturn ioctl_fsfreeze(filp);\n--\nfs/xfs/libxfs/xfs_fs.h=1167=struct xfs_verify_media {\n--\nfs/xfs/libxfs/xfs_fs.h-1260-\nfs/xfs/libxfs/xfs_fs.h:1261:#define XFS_IOC_FREEZE\t\t     _IOWR('X', 119, int)\t/* aka FIFREEZE */\nfs/xfs/libxfs/xfs_fs.h-1262-#define XFS_IOC_THAW\t\t     _IOWR('X', 120, int)\t/* aka FITHAW */\n--\ninclude/uapi/linux/fs.h=226=struct file_attr {\n--\ninclude/uapi/linux/fs.h-315-#define FIGETBSZ   _IO(0x00,2)\t/* get the block size used for bmap */\ninclude/uapi/linux/fs.h:316:#define FIFREEZE\t_IOWR('X', 119, int)\t/* Freeze */\ninclude/uapi/linux/fs.h-317-#define FITHAW\t\t_IOWR('X', 120, int)\t/* Thaw */\n--\ninclude/uapi/linux/landlock.h=248=struct landlock_net_port_attr {\n--\ninclude/uapi/linux/landlock.h-304- *   * IOCTL commands targeting file descriptions (``FIONBIO``, ``FIOASYNC``),\ninclude/uapi/linux/landlock.h:305: *   * IOCTL commands targeting file systems (``FIFREEZE``, ``FITHAW``,\ninclude/uapi/linux/landlock.h-306- *     ``FIGETBSZ``, ``FS_IOC_GETFSUUID``, ``FS_IOC_GETFSSYSFSPATH``)\n--\nsecurity/landlock/fs.c=127=static __attribute_const__ bool is_masked_device_ioctl(const unsigned int cmd)\n--\nsecurity/landlock/fs.c-147-\t/*\nsecurity/landlock/fs.c:148:\t * FIFREEZE and FITHAW freeze and thaw the file system which the\nsecurity/landlock/fs.c-149-\t * given file belongs to.  Requires CAP_SYS_ADMIN.\n--\nsecurity/landlock/fs.c-155-\t */\nsecurity/landlock/fs.c:156:\tcase FIFREEZE:\nsecurity/landlock/fs.c-157-\tcase FITHAW:\n--\ntools/hv/hv_vss_daemon.c=34=static int vss_do_freeze(char *dir, unsigned int cmd)\n--\ntools/hv/hv_vss_daemon.c-52-\tif (ret) {\ntools/hv/hv_vss_daemon.c:53:\t\tif ((cmd == FIFREEZE \u0026\u0026 errno == EBUSY) ||\ntools/hv/hv_vss_daemon.c-54-\t\t    (cmd == FITHAW \u0026\u0026 errno == EINVAL)) {\n--\ntools/hv/hv_vss_daemon.c=113=static int vss_operate(int operation)\n--\ntools/hv/hv_vss_daemon.c-125-\tcase VSS_OP_FREEZE:\ntools/hv/hv_vss_daemon.c:126:\t\tcmd = FIFREEZE;\ntools/hv/hv_vss_daemon.c-127-\t\tbreak;\n--\ntools/include/uapi/linux/fs.h=142=struct fsxattr {\n--\ntools/include/uapi/linux/fs.h-222-#define FIGETBSZ   _IO(0x00,2)\t/* get the block size used for bmap */\ntools/include/uapi/linux/fs.h:223:#define FIFREEZE\t_IOWR('X', 119, int)\t/* Freeze */\ntools/include/uapi/linux/fs.h-224-#define FITHAW\t\t_IOWR('X', 120, int)\t/* Thaw */\n--\ntools/perf/trace/beauty/include/uapi/linux/fs.h=226=struct file_attr {\n--\ntools/perf/trace/beauty/include/uapi/linux/fs.h-315-#define FIGETBSZ   _IO(0x00,2)\t/* get the block size used for bmap */\ntools/perf/trace/beauty/include/uapi/linux/fs.h:316:#define FIFREEZE\t_IOWR('X', 119, int)\t/* Freeze */\ntools/perf/trace/beauty/include/uapi/linux/fs.h-317-#define FITHAW\t\t_IOWR('X', 120, int)\t/* Thaw */\n--\ntools/testing/selftests/landlock/fs_test.c=4020=TEST_F_FORK(layout1, blanket_permitted_ioctls)\n--\ntools/testing/selftests/landlock/fs_test.c-4038-\tEXPECT_NE(EACCES, ioctl_error(_metadata, fd, FIOQSIZE));\ntools/testing/selftests/landlock/fs_test.c:4039:\tEXPECT_NE(EACCES, ioctl_error(_metadata, fd, FIFREEZE));\ntools/testing/selftests/landlock/fs_test.c-4040-\tEXPECT_NE(EACCES, ioctl_error(_metadata, fd, FITHAW));\n"
}

gemini-3.1-pro-preview

null

null

							input: 25280
							output: 18
							thoughts: 24
						

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Investigating the FIFREEZE Mechanism**

Right, so `FIFREEZE` is the syscall we're dealing with here, and the kernel uses `ioctl_fsfreeze` to handle it. That immediately clicks for me; `ioctl_fsfreeze` is the obvious place to look for the meat of the functionality. Let's dig into that function. Time to see precisely how the kernel orchestrates this file system freezing. What are the key locking mechanisms being employed? How does it interact with the underlying block device layers? I want to understand the complete sequence of operations to ensure this freezing and thawing process is robust and doesn't introduce any unforeseen issues in my system design.

{
  "Expression": "ioctl_fsfreeze"
}

{
  "Output": "fs/ioctl.c=363=static int ioctl_fioasync(unsigned int fd, struct file *filp,\n--\nfs/ioctl.c-384-\nfs/ioctl.c:385:static int ioctl_fsfreeze(struct file *filp)\nfs/ioctl.c-386-{\n--\nfs/ioctl.c=492=static int do_vfs_ioctl(struct file *filp, unsigned int fd,\n--\nfs/ioctl.c-524-\tcase FIFREEZE:\nfs/ioctl.c:525:\t\treturn ioctl_fsfreeze(filp);\nfs/ioctl.c-526-\n"
}

gemini-3.1-pro-preview

null

null

							input: 25659
							output: 33
							thoughts: 13
						

Okay, let's dive into this `ioctl_fsfreeze` function. I need to understand exactly what it's achieving. I'm already familiar with the general landscape of filesystem operations and ioctl calls, but the specifics of `fsfreeze` are what I'm focusing on now. I'm thinking about the implications for consistency and data integrity. What are the key underlying mechanisms? What does this mean for a live system? It's clearly related to freezing a filesystem, but I need to grasp the nuances – does this involve a simple pause in operations, or more elaborate coordination with the block layer? Are there different levels of freezing supported? I need to consider any potential race conditions and locking strategies that are implemented to ensure the freeze is atomic and safe. My understanding is that freeze/thaw is important in areas like backups and snapshots. It will be interesting to understand how it's designed.

{
  "File": "fs/ioctl.c",
  "FirstLine": 385,
  "LineCount": 20
}

{
  "Contents": " 385:\tstatic int ioctl_fsfreeze(struct file *filp)\n 386:\t{\n 387:\t\tstruct super_block *sb = file_inode(filp)-\u003ei_sb;\n 388:\t\n 389:\t\tif (!ns_capable(sb-\u003es_user_ns, CAP_SYS_ADMIN))\n 390:\t\t\treturn -EPERM;\n 391:\t\n 392:\t\t/* If filesystem doesn't support freeze feature, return. */\n 393:\t\tif (sb-\u003es_op-\u003efreeze_fs == NULL \u0026\u0026 sb-\u003es_op-\u003efreeze_super == NULL)\n 394:\t\t\treturn -EOPNOTSUPP;\n 395:\t\n 396:\t\t/* Freeze */\n 397:\t\tif (sb-\u003es_op-\u003efreeze_super)\n 398:\t\t\treturn sb-\u003es_op-\u003efreeze_super(sb, FREEZE_HOLDER_USERSPACE, NULL);\n 399:\t\treturn freeze_super(sb, FREEZE_HOLDER_USERSPACE, NULL);\n 400:\t}\n 401:\t\n 402:\tstatic int ioctl_fsthaw(struct file *filp)\n 403:\t{\n 404:\t\tstruct super_block *sb = file_inode(filp)-\u003ei_sb;\n"
}

gemini-3.1-pro-preview

null

null

							input: 26242
							output: 20
							thoughts: 68
						

Okay, let's break this down.

**Freezing the Filesystem: A Closer Look**

Right, so `ioctl_fsfreeze` initiates the filesystem freeze by calling `freeze_super`. That's the expected starting point. But I'm noticing something: it *doesn't* appear to directly call `bdev_freeze` or `fs_bdev_freeze`. That's a bit unusual; I would have assumed those were integral to a complete freeze sequence.

Hold on, though... didn't I see `bdev_freeze` mentioned somewhere else? Ah, yes! `exfat_force_shutdown` utilizes `bdev_freeze` and presumably other modules too. Interesting. It seems like the block device freeze is handled separately, perhaps under specific circumstances. Given that, I should dig into `exfat_force_shutdown` to see when and why `bdev_freeze` is being invoked there. This could be the key to understanding the overall freezing process and identifying any potential gaps or inefficiencies in the current implementation. I need to understand what's special about `exfat` such that it uses `bdev_freeze` explicitly.

{
  "Expression": "exfat_force_shutdown"
}

{
  "Output": "fs/exfat/exfat_fs.h=569=long exfat_compat_ioctl(struct file *filp, unsigned int cmd,\nfs/exfat/exfat_fs.h-570-\t\t\t\tunsigned long arg);\nfs/exfat/exfat_fs.h:571:int exfat_force_shutdown(struct super_block *sb, u32 flags);\nfs/exfat/exfat_fs.h-572-\n--\nfs/exfat/file.c=545=static int exfat_ioctl_shutdown(struct super_block *sb, unsigned long arg)\n--\nfs/exfat/file.c-554-\nfs/exfat/file.c:555:\treturn exfat_force_shutdown(sb, flags);\nfs/exfat/file.c-556-}\n--\nfs/exfat/super.c=116=static int exfat_show_options(struct seq_file *m, struct dentry *root)\n--\nfs/exfat/super.c-154-\nfs/exfat/super.c:155:int exfat_force_shutdown(struct super_block *sb, u32 flags)\nfs/exfat/super.c-156-{\n--\nfs/exfat/super.c=185=static void exfat_shutdown(struct super_block *sb)\nfs/exfat/super.c-186-{\nfs/exfat/super.c:187:\texfat_force_shutdown(sb, EXFAT_GOING_DOWN_NOSYNC);\nfs/exfat/super.c-188-}\n"
}

gemini-3.1-pro-preview

null

null

							input: 26987
							output: 34
							thoughts: 924
						

**My Analysis of the exFAT Shutdown Mechanism**

Okay, so I've traced the execution path and it looks like `exfat_force_shutdown` gets called through `exfat_ioctl_shutdown`. This is interesting because that means the `EXFAT_IOC_SHUTDOWN` ioctl, as well as similar ioctls from other filesystems, can trigger `bdev_freeze`. Ultimately, `bdev_freeze` then calls `fs_bdev_freeze`.

Now, the crucial link is that `fs_bdev_freeze` is invoked when `bdev_freeze` is called on a block device that has `fs_holder_ops`. And, as I recall, when exFAT mounts a block device, it does so using `fs_holder_ops`. So, a `bdev_freeze` call on `sb->s_bdev` will, in fact, invoke `fs_bdev_freeze`. That's the core.

Let me refresh my memory on `fs_bdev_freeze`: it retrieves the superblock, checks for its existence, and then calls the superblock's `freeze_super` function. If that succeeds, it synchronizes the block device and handles any errors by thawing the superblock. This code is definitely reachable and will work. The patch in `fs/exfat/misc.c` confirms this.

```c
static int fs_bdev_freeze(struct block_device *bdev)
{
	struct super_block *sb = get_bdev_super(bdev);
	int error = 0;

	if (!sb)
		return -EINVAL;

	if (sb->s_op->freeze_super)
		error = sb->s_op->freeze_super(sb,
				FREEZE_MAY_NEST | FREEZE_HOLDER_USERSPACE, NULL);
	else
		error = freeze_super(sb,
				FREEZE_MAY_NEST | FREEZE_HOLDER_USERSPACE, NULL);
	if (!error) {
		error = sync_blockdev(bdev);
		if (error) {
			if (sb->s_op->thaw_super)
				(void)sb->s_op->thaw_super(
					sb,
					FREEZE_MAY_NEST |
						FREEZE_HOLDER_USERSPACE,
					NULL);
			else
				(void)thaw_super(
					sb,
					FREEZE_MAY_NEST |
						FREEZE_HOLDER_USERSPACE,
					NULL);
		}
	}
	deactivate_super(sb);
	return error;
}
```

Now, let's look at the exfat error handling. We're interested in the `__exfat_fs_error` function.

```c
void __exfat_fs_error(struct super_block *sb, int report, const char *fmt, ...)
{
...
	} else if (opts->errors == EXFAT_ERRORS_RO && !sb_rdonly(sb)) {
		set_bit(EXFAT_FLAGS_SHUTDOWN, &EXFAT_SB(sb)->s_exfat_flags);
		/*
		 * We have already set EXFAT_FLAGS_SHUTDOWN flag to stop all updates
		 * to filesystem, so it doesn't need to set SB_RDONLY flag here
		 * because the flag should be set covered w/ sb->s_umount semaphore
		 * via remount procedure, otherwise, it will confuse code like
		 * freeze_super() which will lead to deadlocks and other problems.
		 */
		exfat_err(sb, "Filesystem has been set read-only");
	}
}
```

This gets called when an error occurs in exFAT and the `errors=remount-ro` option is set. So, we have two likely entry points: `fs_bdev_freeze` (triggered by the ioctl) and `__exfat_fs_error` (triggered by an error). This means the focus should be on these two areas.

Let me confirm if `fs_bdev_freeze` in `fs/super.c` is exported or if it can be modified easily. Yes, it's a static function so we can modify it. `CONFIG_EXFAT_FS` is, obviously, required, and `CONFIG_BLOCK` is needed for the block devices.
So, `EXFAT_FS` is the main config we need to worry about. I'll take another look at `fs_bdev_freeze` to ensure my understanding is complete.

{
  "File": "fs/super.c",
  "FirstLine": 1460,
  "LineCount": 40
}

{
  "Contents": "1460:\t * block device and won't be unfrozen until all block devices are\n1461:\t * unfrozen. Each block device can only freeze the filesystem once as we\n1462:\t * nest freezes for block devices in the block layer.\n1463:\t *\n1464:\t * Return: If the freeze was successful zero is returned. If the freeze\n1465:\t *         failed a negative error code is returned.\n1466:\t */\n1467:\tstatic int fs_bdev_freeze(struct block_device *bdev)\n1468:\t{\n1469:\t\tstruct super_block *sb;\n1470:\t\tint error = 0;\n1471:\t\n1472:\t\tlockdep_assert_held(\u0026bdev-\u003ebd_fsfreeze_mutex);\n1473:\t\n1474:\t\tsb = get_bdev_super(bdev);\n1475:\t\tif (!sb)\n1476:\t\t\treturn -EINVAL;\n1477:\t\n1478:\t\tif (sb-\u003es_op-\u003efreeze_super)\n1479:\t\t\terror = sb-\u003es_op-\u003efreeze_super(sb,\n1480:\t\t\t\t\tFREEZE_MAY_NEST | FREEZE_HOLDER_USERSPACE, NULL);\n1481:\t\telse\n1482:\t\t\terror = freeze_super(sb,\n1483:\t\t\t\t\tFREEZE_MAY_NEST | FREEZE_HOLDER_USERSPACE, NULL);\n1484:\t\tif (!error) {\n1485:\t\t\terror = sync_blockdev(bdev);\n1486:\t\t\tif (error) {\n1487:\t\t\t\tif (sb-\u003es_op-\u003ethaw_super)\n1488:\t\t\t\t\t(void)sb-\u003es_op-\u003ethaw_super(\n1489:\t\t\t\t\t\tsb,\n1490:\t\t\t\t\t\tFREEZE_MAY_NEST |\n1491:\t\t\t\t\t\t\tFREEZE_HOLDER_USERSPACE,\n1492:\t\t\t\t\t\tNULL);\n1493:\t\t\t\telse\n1494:\t\t\t\t\t(void)thaw_super(\n1495:\t\t\t\t\t\tsb,\n1496:\t\t\t\t\t\tFREEZE_MAY_NEST |\n1497:\t\t\t\t\t\t\tFREEZE_HOLDER_USERSPACE,\n1498:\t\t\t\t\t\tNULL);\n1499:\t\t\t}\n"
}

gemini-3.1-pro-preview

null

null

							input: 29564
							output: 35
							thoughts: 37
						

Okay, here's my take on those thoughts, framed as an expert's internal monologue:

**Quick Scan of the Situation**

Alright, so `fs_bdev_freeze` - it's a *static* function. Got it. That immediately narrows down its scope.  It's not exported globally, so its use is likely contained within a specific module or file, which is useful to remember. Now, where was that other one?  Ah yes, `__exfat_fs_error`. I know that one too. I'm pretty sure it resides in `fs/exfat/misc.c`.  That file is like a catch-all for various utility functions in the exFAT filesystem implementation, I can visualize the structure of that one pretty well, at least in my head. Thinking about those file names and functions immediately starts to paint a picture about the relationship between things in the code-base.

{
  "File": "fs/exfat/misc.c",
  "FirstLine": 30,
  "LineCount": 30
}

{
  "Contents": "  30:\t\tstruct va_format vaf;\n  31:\t\n  32:\t\tif (report) {\n  33:\t\t\tva_start(args, fmt);\n  34:\t\t\tvaf.fmt = fmt;\n  35:\t\t\tvaf.va = \u0026args;\n  36:\t\t\texfat_err(sb, \"error, %pV\", \u0026vaf);\n  37:\t\t\tva_end(args);\n  38:\t\t}\n  39:\t\n  40:\t\tif (opts-\u003eerrors == EXFAT_ERRORS_PANIC) {\n  41:\t\t\tpanic(\"exFAT-fs (%s): fs panic from previous error\\n\",\n  42:\t\t\t\tsb-\u003es_id);\n  43:\t\t} else if (opts-\u003eerrors == EXFAT_ERRORS_RO \u0026\u0026 !sb_rdonly(sb)) {\n  44:\t\t\tset_bit(EXFAT_FLAGS_SHUTDOWN, \u0026EXFAT_SB(sb)-\u003es_exfat_flags);\n  45:\t\t\t/*\n  46:\t\t\t * We have already set EXFAT_FLAGS_SHUTDOWN flag to stop all updates\n  47:\t\t\t * to filesystem, so it doesn't need to set SB_RDONLY flag here\n  48:\t\t\t * because the flag should be set covered w/ sb-\u003es_umount semaphore\n  49:\t\t\t * via remount procedure, otherwise, it will confuse code like\n  50:\t\t\t * freeze_super() which will lead to deadlocks and other problems.\n  51:\t\t\t */\n  52:\t\t\texfat_err(sb, \"Filesystem has been set read-only\");\n  53:\t\t}\n  54:\t}\n  55:\t\n  56:\t#define SECS_PER_MIN    (60)\n  57:\t#define TIMEZONE_SEC(x)\t((x) * 15 * SECS_PER_MIN)\n  58:\t\n  59:\tstatic void exfat_adjust_tz(struct timespec64 *ts, u8 tz_off)\n"
}

gemini-3.1-pro-preview

null

null

							input: 30337
							output: 169
							thoughts: 182
						

**Analyzing the Proposed Patch**

Okay, so this patch is touching `fs_bdev_freeze` and `__exfat_fs_error`. Right away, I see these are functional changes, meaning they're not just cosmetic or refactoring, but actually *change* how the system behaves. Good, that's what we need to focus on for fuzzing.

`fs_bdev_freeze`... ah, that's the one that was leaving the superblock frozen after a `sync_blockdev` failure. Definitely a nasty one, and exactly the kind of thing syzkaller loves to trip up on. Excellent. The other one, `__exfat_fs_error`, sounds like it's addressing a deadlock situation when `SB_RDONLY` is set without the `s_umount` semaphore. This is another classic. Concurrency bugs are always prime targets.

Perfect, this hits the sweet spot of syzkaller's strengths. We *want* to fuzz these fixes.

Let's see, what configs do we need? Just `EXFAT_FS`. Let me quickly double-check... yep, `CONFIG_EXFAT_FS` is the one. All good.

Time to call `set-results`.

{
  "EnableConfigs": [
    "EXFAT_FS"
  ],
  "FocusSymbols": [
    "fs_bdev_freeze",
    "__exfat_fs_error"
  ],
  "Reasoning": "The patch modifies VFS block device freezing logic (`fs_bdev_freeze`) to properly thaw the superblock if `sync_blockdev` fails, preventing a frozen state leak. It also modifies exfat error handling (`__exfat_fs_error`) to set a shutdown flag instead of directly modifying `sb-\u003es_flags` with `SB_RDONLY` without holding the `s_umount` semaphore, which previously caused deadlocks with `freeze_super()`. Both are functional changes in reachable code paths that should be fuzzed.",
  "WorthFuzzing": true
}

{
  "EnableConfigs": [
    "EXFAT_FS"
  ],
  "FocusSymbols": [
    "fs_bdev_freeze",
    "__exfat_fs_error"
  ],
  "Reasoning": "The patch modifies VFS block device freezing logic (`fs_bdev_freeze`) to properly thaw the superblock if `sync_blockdev` fails, preventing a frozen state leak. It also modifies exfat error handling (`__exfat_fs_error`) to set a shutdown flag instead of directly modifying `sb-\u003es_flags` with `SB_RDONLY` without holding the `s_umount` semaphore, which previously caused deadlocks with `freeze_super()`. Both are functional changes in reachable code paths that should be fuzzed.",
  "WorthFuzzing": true
}