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Message-ID: <4B1C500E.5040406@gmail.com>
Date: Mon, 07 Dec 2009 01:45:02 +0100
From: Emese Revfy <re.emese@...il.com>
To: Greg KH <gregkh@...e.de>
CC: lenb@...nel.org, astarikovskiy@...e.de, mchehab@...radead.org,
linville@...driver.com, miklos@...redi.hu, davem@...emloft.net,
rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
avi@...hat.com, mtosatti@...hat.com, torvalds@...ux-foundation.org,
linux-kernel@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH 11/31] Constify struct file_operations for 2.6.32 v1
Greg KH wrote:
> On Sun, Dec 06, 2009 at 02:47:44AM +0100, Emese Revfy wrote:
>> Greg KH wrote:
>>> On Sat, Dec 05, 2009 at 03:50:23AM +0100, Emese Revfy wrote:
>>>> Greg KH wrote:
>>>>> On Sat, Dec 05, 2009 at 01:02:59AM +0100, Emese Revfy wrote:
>>>>>> -static struct file_operations ptmx_fops;
>>>>>> +static const struct file_operations ptmx_fops = {
>>>>>> + .llseek = no_llseek,
>>>>>> + .read = tty_read,
>>>>>> + .write = tty_write,
>>>>>> + .poll = tty_poll,
>>>>>> + .unlocked_ioctl = tty_ioctl,
>>>>>> + .compat_ioctl = tty_compat_ioctl,
>>>>>> + .open = ptmx_open,
>>>>>> + .release = tty_release,
>>>>>> + .fasync = tty_fasync,
>>>>>> +};
>>>>> You just made these functions all global, for no real good reason. Why
>>>>> did you do this?
>>>> I think this is the only way to make ptmx_fops const, provided we want to.
>>> Why do we want to?
>> Because I saw that checkpatch.pl itself tries to ensure the same I went
>> through the whole tree looking for non-const file_operations structures
>> and tried to make them const as best as I could. If you think making
>> ptmx_fops const is not worth the effort I will remove it from the patch.
>
> Based on the patch, I would think it is not worth it.
>
> thanks,
>
> greg k-h
>
Ok, I removed the affected hunks.
From: Emese Revfy <re.emese@...il.com>
Constify struct file_operations with some exceptions.
Signed-off-by: Emese Revfy <re.emese@...il.com>
---
drivers/acpi/battery.c | 2 +-
drivers/char/pty.c | 1 +
drivers/char/tty_io.c | 1 +
drivers/media/dvb/dvb-core/dvbdev.c | 1 +
drivers/net/wireless/b43/debugfs.c | 2 +-
drivers/net/wireless/b43legacy/debugfs.c | 2 +-
drivers/net/wireless/libertas/debugfs.c | 2 +-
drivers/staging/b3dfg/b3dfg.c | 2 +-
drivers/staging/dream/qdsp5/adsp_driver.c | 2 +-
drivers/staging/dream/qdsp5/audio_aac.c | 2 +-
drivers/staging/dream/qdsp5/audio_amrnb.c | 2 +-
drivers/staging/dream/qdsp5/audio_evrc.c | 2 +-
drivers/staging/dream/qdsp5/audio_in.c | 4 ++--
drivers/staging/dream/qdsp5/audio_mp3.c | 2 +-
drivers/staging/dream/qdsp5/audio_out.c | 4 ++--
drivers/staging/dream/qdsp5/audio_qcelp.c | 2 +-
drivers/staging/dream/qdsp5/snd.c | 2 +-
drivers/staging/dream/smd/smd_qmi.c | 2 +-
drivers/staging/dream/smd/smd_rpcrouter_device.c | 4 ++--
drivers/staging/panel/panel.c | 4 ++--
drivers/staging/poch/poch.c | 2 +-
drivers/staging/sep/sep_driver.c | 2 +-
drivers/staging/vme/devices/vme_user.c | 2 +-
fs/char_dev.c | 1 +
fs/fuse/cuse.c | 19 ++++++++++++-------
fs/fuse/dev.c | 8 ++++----
fs/fuse/fuse_i.h | 10 ++++++++++
virt/kvm/kvm_main.c | 3 +++
28 files changed, 57 insertions(+), 35 deletions(-)
diff --git a/drivers/acpi/battery.c b/drivers/acpi/battery.c
index 3f4602b..2e41d36 100644
--- a/drivers/acpi/battery.c
+++ b/drivers/acpi/battery.c
@@ -763,7 +763,7 @@ DECLARE_FILE_FUNCTIONS(alarm);
}
static struct battery_file {
- struct file_operations ops;
+ const struct file_operations ops;
mode_t mode;
const char *name;
} acpi_battery_file[] = {
diff --git a/drivers/char/pty.c b/drivers/char/pty.c
index 62f282e..96e29e5 100644
--- a/drivers/char/pty.c
+++ b/drivers/char/pty.c
@@ -682,6 +682,7 @@ static int ptmx_open(struct inode *inode, struct file *filp)
return ret;
}
+/* cannot be const, see unix98_pty_init */
static struct file_operations ptmx_fops;
static void __init unix98_pty_init(void)
diff --git a/drivers/char/tty_io.c b/drivers/char/tty_io.c
index 59499ee..97616a9 100644
--- a/drivers/char/tty_io.c
+++ b/drivers/char/tty_io.c
@@ -3046,6 +3046,7 @@ struct tty_struct *get_current_tty(void)
}
EXPORT_SYMBOL_GPL(get_current_tty);
+/* cannot be const, see this function */
void tty_default_fops(struct file_operations *fops)
{
*fops = tty_fops;
diff --git a/drivers/media/dvb/dvb-core/dvbdev.c b/drivers/media/dvb/dvb-core/dvbdev.c
index 94159b9..9684961 100644
--- a/drivers/media/dvb/dvb-core/dvbdev.c
+++ b/drivers/media/dvb/dvb-core/dvbdev.c
@@ -191,6 +191,7 @@ int dvb_register_device(struct dvb_adapter *adap, struct dvb_device **pdvbdev,
const struct dvb_device *template, void *priv, int type)
{
struct dvb_device *dvbdev;
+ /* cannot be const, see this function */
struct file_operations *dvbdevfops;
struct device *clsdev;
int minor;
diff --git a/drivers/net/wireless/b43/debugfs.c b/drivers/net/wireless/b43/debugfs.c
index 80b19a4..dab3a45 100644
--- a/drivers/net/wireless/b43/debugfs.c
+++ b/drivers/net/wireless/b43/debugfs.c
@@ -43,7 +43,7 @@ static struct dentry *rootdir;
struct b43_debugfs_fops {
ssize_t (*read)(struct b43_wldev *dev, char *buf, size_t bufsize);
int (*write)(struct b43_wldev *dev, const char *buf, size_t count);
- struct file_operations fops;
+ const struct file_operations fops;
/* Offset of struct b43_dfs_file in struct b43_dfsentry */
size_t file_struct_offset;
};
diff --git a/drivers/net/wireless/b43legacy/debugfs.c b/drivers/net/wireless/b43legacy/debugfs.c
index 1f85ac5..c99b4b4 100644
--- a/drivers/net/wireless/b43legacy/debugfs.c
+++ b/drivers/net/wireless/b43legacy/debugfs.c
@@ -44,7 +44,7 @@ static struct dentry *rootdir;
struct b43legacy_debugfs_fops {
ssize_t (*read)(struct b43legacy_wldev *dev, char *buf, size_t bufsize);
int (*write)(struct b43legacy_wldev *dev, const char *buf, size_t count);
- struct file_operations fops;
+ const struct file_operations fops;
/* Offset of struct b43legacy_dfs_file in struct b43legacy_dfsentry */
size_t file_struct_offset;
/* Take wl->irq_lock before calling read/write? */
diff --git a/drivers/net/wireless/libertas/debugfs.c b/drivers/net/wireless/libertas/debugfs.c
index 893a55c..7f66a50 100644
--- a/drivers/net/wireless/libertas/debugfs.c
+++ b/drivers/net/wireless/libertas/debugfs.c
@@ -708,7 +708,7 @@ out_unlock:
struct lbs_debugfs_files {
const char *name;
int perm;
- struct file_operations fops;
+ const struct file_operations fops;
};
static const struct lbs_debugfs_files debugfs_files[] = {
diff --git a/drivers/staging/b3dfg/b3dfg.c b/drivers/staging/b3dfg/b3dfg.c
index cda26bb..25f3ec6 100644
--- a/drivers/staging/b3dfg/b3dfg.c
+++ b/drivers/staging/b3dfg/b3dfg.c
@@ -848,7 +848,7 @@ static int b3dfg_mmap(struct file *filp, struct vm_area_struct *vma)
return r;
}
-static struct file_operations b3dfg_fops = {
+static const struct file_operations b3dfg_fops = {
.owner = THIS_MODULE,
.open = b3dfg_open,
.release = b3dfg_release,
diff --git a/drivers/staging/dream/qdsp5/adsp_driver.c b/drivers/staging/dream/qdsp5/adsp_driver.c
index e55a0db..577b776 100644
--- a/drivers/staging/dream/qdsp5/adsp_driver.c
+++ b/drivers/staging/dream/qdsp5/adsp_driver.c
@@ -576,7 +576,7 @@ static struct adsp_device *inode_to_device(struct inode *inode)
static dev_t adsp_devno;
static struct class *adsp_class;
-static struct file_operations adsp_fops = {
+static const struct file_operations adsp_fops = {
.owner = THIS_MODULE,
.open = adsp_open,
.unlocked_ioctl = adsp_ioctl,
diff --git a/drivers/staging/dream/qdsp5/audio_aac.c b/drivers/staging/dream/qdsp5/audio_aac.c
index ad2390f..4116ee8 100644
--- a/drivers/staging/dream/qdsp5/audio_aac.c
+++ b/drivers/staging/dream/qdsp5/audio_aac.c
@@ -1022,7 +1022,7 @@ done:
return rc;
}
-static struct file_operations audio_aac_fops = {
+static const struct file_operations audio_aac_fops = {
.owner = THIS_MODULE,
.open = audio_open,
.release = audio_release,
diff --git a/drivers/staging/dream/qdsp5/audio_amrnb.c b/drivers/staging/dream/qdsp5/audio_amrnb.c
index cd818a5..870b37b 100644
--- a/drivers/staging/dream/qdsp5/audio_amrnb.c
+++ b/drivers/staging/dream/qdsp5/audio_amrnb.c
@@ -833,7 +833,7 @@ done:
return rc;
}
-static struct file_operations audio_amrnb_fops = {
+static const struct file_operations audio_amrnb_fops = {
.owner = THIS_MODULE,
.open = audamrnb_open,
.release = audamrnb_release,
diff --git a/drivers/staging/dream/qdsp5/audio_evrc.c b/drivers/staging/dream/qdsp5/audio_evrc.c
index 4b43e18..cedafda 100644
--- a/drivers/staging/dream/qdsp5/audio_evrc.c
+++ b/drivers/staging/dream/qdsp5/audio_evrc.c
@@ -805,7 +805,7 @@ dma_fail:
return rc;
}
-static struct file_operations audio_evrc_fops = {
+static const struct file_operations audio_evrc_fops = {
.owner = THIS_MODULE,
.open = audevrc_open,
.release = audevrc_release,
diff --git a/drivers/staging/dream/qdsp5/audio_in.c b/drivers/staging/dream/qdsp5/audio_in.c
index 3d950a2..9431118 100644
--- a/drivers/staging/dream/qdsp5/audio_in.c
+++ b/drivers/staging/dream/qdsp5/audio_in.c
@@ -913,7 +913,7 @@ static int audpre_open(struct inode *inode, struct file *file)
return 0;
}
-static struct file_operations audio_fops = {
+static const struct file_operations audio_fops = {
.owner = THIS_MODULE,
.open = audio_in_open,
.release = audio_in_release,
@@ -922,7 +922,7 @@ static struct file_operations audio_fops = {
.unlocked_ioctl = audio_in_ioctl,
};
-static struct file_operations audpre_fops = {
+static const struct file_operations audpre_fops = {
.owner = THIS_MODULE,
.open = audpre_open,
.unlocked_ioctl = audpre_ioctl,
diff --git a/drivers/staging/dream/qdsp5/audio_mp3.c b/drivers/staging/dream/qdsp5/audio_mp3.c
index b95574f..286c2f4 100644
--- a/drivers/staging/dream/qdsp5/audio_mp3.c
+++ b/drivers/staging/dream/qdsp5/audio_mp3.c
@@ -941,7 +941,7 @@ done:
return rc;
}
-static struct file_operations audio_mp3_fops = {
+static const struct file_operations audio_mp3_fops = {
.owner = THIS_MODULE,
.open = audio_open,
.release = audio_release,
diff --git a/drivers/staging/dream/qdsp5/audio_out.c b/drivers/staging/dream/qdsp5/audio_out.c
index d1adcf6..f8f9833 100644
--- a/drivers/staging/dream/qdsp5/audio_out.c
+++ b/drivers/staging/dream/qdsp5/audio_out.c
@@ -810,7 +810,7 @@ static int audpp_open(struct inode *inode, struct file *file)
return 0;
}
-static struct file_operations audio_fops = {
+static const struct file_operations audio_fops = {
.owner = THIS_MODULE,
.open = audio_open,
.release = audio_release,
@@ -819,7 +819,7 @@ static struct file_operations audio_fops = {
.unlocked_ioctl = audio_ioctl,
};
-static struct file_operations audpp_fops = {
+static const struct file_operations audpp_fops = {
.owner = THIS_MODULE,
.open = audpp_open,
.unlocked_ioctl = audpp_ioctl,
diff --git a/drivers/staging/dream/qdsp5/audio_qcelp.c b/drivers/staging/dream/qdsp5/audio_qcelp.c
index f0f50e3..f6b9dbc 100644
--- a/drivers/staging/dream/qdsp5/audio_qcelp.c
+++ b/drivers/staging/dream/qdsp5/audio_qcelp.c
@@ -816,7 +816,7 @@ err:
return rc;
}
-static struct file_operations audio_qcelp_fops = {
+static const struct file_operations audio_qcelp_fops = {
.owner = THIS_MODULE,
.open = audqcelp_open,
.release = audqcelp_release,
diff --git a/drivers/staging/dream/qdsp5/snd.c b/drivers/staging/dream/qdsp5/snd.c
index 037d7ff..5469ec3 100644
--- a/drivers/staging/dream/qdsp5/snd.c
+++ b/drivers/staging/dream/qdsp5/snd.c
@@ -242,7 +242,7 @@ err:
return rc;
}
-static struct file_operations snd_fops = {
+static const struct file_operations snd_fops = {
.owner = THIS_MODULE,
.open = snd_open,
.release = snd_release,
diff --git a/drivers/staging/dream/smd/smd_qmi.c b/drivers/staging/dream/smd/smd_qmi.c
index d4e7d88..0ea632a 100644
--- a/drivers/staging/dream/smd/smd_qmi.c
+++ b/drivers/staging/dream/smd/smd_qmi.c
@@ -793,7 +793,7 @@ static int qmi_release(struct inode *ip, struct file *fp)
return 0;
}
-static struct file_operations qmi_fops = {
+static const struct file_operations qmi_fops = {
.owner = THIS_MODULE,
.read = qmi_read,
.write = qmi_write,
diff --git a/drivers/staging/dream/smd/smd_rpcrouter_device.c b/drivers/staging/dream/smd/smd_rpcrouter_device.c
index cd3910b..ff053d3 100644
--- a/drivers/staging/dream/smd/smd_rpcrouter_device.c
+++ b/drivers/staging/dream/smd/smd_rpcrouter_device.c
@@ -214,7 +214,7 @@ static long rpcrouter_ioctl(struct file *filp, unsigned int cmd,
return rc;
}
-static struct file_operations rpcrouter_server_fops = {
+static const struct file_operations rpcrouter_server_fops = {
.owner = THIS_MODULE,
.open = rpcrouter_open,
.release = rpcrouter_release,
@@ -224,7 +224,7 @@ static struct file_operations rpcrouter_server_fops = {
.unlocked_ioctl = rpcrouter_ioctl,
};
-static struct file_operations rpcrouter_router_fops = {
+static const struct file_operations rpcrouter_router_fops = {
.owner = THIS_MODULE,
.open = rpcrouter_open,
.release = rpcrouter_release,
diff --git a/drivers/staging/panel/panel.c b/drivers/staging/panel/panel.c
index 4ce399b..225f9bc 100644
--- a/drivers/staging/panel/panel.c
+++ b/drivers/staging/panel/panel.c
@@ -1305,7 +1305,7 @@ static int lcd_release(struct inode *inode, struct file *file)
return 0;
}
-static struct file_operations lcd_fops = {
+static const struct file_operations lcd_fops = {
.write = lcd_write,
.open = lcd_open,
.release = lcd_release,
@@ -1565,7 +1565,7 @@ static int keypad_release(struct inode *inode, struct file *file)
return 0;
}
-static struct file_operations keypad_fops = {
+static const struct file_operations keypad_fops = {
.read = keypad_read, /* read */
.open = keypad_open, /* open */
.release = keypad_release, /* close */
diff --git a/drivers/staging/poch/poch.c b/drivers/staging/poch/poch.c
index 2eb8e3d..57616a7 100644
--- a/drivers/staging/poch/poch.c
+++ b/drivers/staging/poch/poch.c
@@ -1057,7 +1057,7 @@ static int poch_ioctl(struct inode *inode, struct file *filp,
return 0;
}
-static struct file_operations poch_fops = {
+static const struct file_operations poch_fops = {
.owner = THIS_MODULE,
.open = poch_open,
.release = poch_release,
diff --git a/drivers/staging/sep/sep_driver.c b/drivers/staging/sep/sep_driver.c
index f890a16..509ece8 100644
--- a/drivers/staging/sep/sep_driver.c
+++ b/drivers/staging/sep/sep_driver.c
@@ -2603,7 +2603,7 @@ static struct pci_driver sep_pci_driver = {
static dev_t sep_devno;
/* the files operations structure of the driver */
-static struct file_operations sep_file_operations = {
+static const struct file_operations sep_file_operations = {
.owner = THIS_MODULE,
.ioctl = sep_ioctl,
.poll = sep_poll,
diff --git a/drivers/staging/vme/devices/vme_user.c b/drivers/staging/vme/devices/vme_user.c
index 7891288..8e31300 100644
--- a/drivers/staging/vme/devices/vme_user.c
+++ b/drivers/staging/vme/devices/vme_user.c
@@ -136,7 +136,7 @@ static int vme_user_ioctl(struct inode *, struct file *, unsigned int,
static int __init vme_user_probe(struct device *, int, int);
static int __exit vme_user_remove(struct device *, int, int);
-static struct file_operations vme_user_fops = {
+static const struct file_operations vme_user_fops = {
.open = vme_user_open,
.release = vme_user_release,
.read = vme_user_read,
diff --git a/fs/char_dev.c b/fs/char_dev.c
index d6db933..7b47e79 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -547,6 +547,7 @@ struct cdev *cdev_alloc(void)
* Initializes @cdev, remembering @fops, making it ready to add to the
* system with cdev_add().
*/
+
void cdev_init(struct cdev *cdev, const struct file_operations *fops)
{
memset(cdev, 0, sizeof *cdev);
diff --git a/fs/fuse/cuse.c b/fs/fuse/cuse.c
index de792dc..2115e7f 100644
--- a/fs/fuse/cuse.c
+++ b/fs/fuse/cuse.c
@@ -528,7 +528,18 @@ static int cuse_channel_release(struct inode *inode, struct file *file)
return rc;
}
-static struct file_operations cuse_channel_fops; /* initialized during init */
+static const struct file_operations cuse_channel_fops = { /* initialized during init */
+ .owner = THIS_MODULE,
+ .llseek = no_llseek,
+ .read = do_sync_read,
+ .aio_read = fuse_dev_read,
+ .write = do_sync_write,
+ .aio_write = fuse_dev_write,
+ .poll = fuse_dev_poll,
+ .open = cuse_channel_open,
+ .release = cuse_channel_release,
+ .fasync = fuse_dev_fasync,
+};
/**************************************************************************
@@ -575,12 +586,6 @@ static int __init cuse_init(void)
for (i = 0; i < CUSE_CONNTBL_LEN; i++)
INIT_LIST_HEAD(&cuse_conntbl[i]);
- /* inherit and extend fuse_dev_operations */
- cuse_channel_fops = fuse_dev_operations;
- cuse_channel_fops.owner = THIS_MODULE;
- cuse_channel_fops.open = cuse_channel_open;
- cuse_channel_fops.release = cuse_channel_release;
-
cuse_class = class_create(THIS_MODULE, "cuse");
if (IS_ERR(cuse_class))
return PTR_ERR(cuse_class);
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 51d9e33..03c8f95 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -745,7 +745,7 @@ __releases(&fc->lock)
* request_end(). Otherwise add it to the processing list, and set
* the 'sent' flag.
*/
-static ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
+ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
int err;
@@ -987,7 +987,7 @@ static int copy_out_args(struct fuse_copy_state *cs, struct fuse_out *out,
* it from the list and copy the rest of the buffer to the request.
* The request is finished by calling request_end()
*/
-static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
+ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
int err;
@@ -1084,7 +1084,7 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
return err;
}
-static unsigned fuse_dev_poll(struct file *file, poll_table *wait)
+unsigned fuse_dev_poll(struct file *file, poll_table *wait)
{
unsigned mask = POLLOUT | POLLWRNORM;
struct fuse_conn *fc = fuse_get_conn(file);
@@ -1210,7 +1210,7 @@ int fuse_dev_release(struct inode *inode, struct file *file)
}
EXPORT_SYMBOL_GPL(fuse_dev_release);
-static int fuse_dev_fasync(int fd, struct file *file, int on)
+int fuse_dev_fasync(int fd, struct file *file, int on)
{
struct fuse_conn *fc = fuse_get_conn(file);
if (!fc)
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 01cc462..b11fe78 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -521,6 +521,16 @@ extern const struct file_operations fuse_dev_operations;
extern const struct dentry_operations fuse_dentry_operations;
+extern ssize_t fuse_dev_read(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos);
+
+extern ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
+ unsigned long nr_segs, loff_t pos);
+
+extern unsigned fuse_dev_poll(struct file *file, poll_table *wait);
+
+extern int fuse_dev_fasync(int fd, struct file *file, int on);
+
/**
* Inode to nodeid comparison.
*/
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 7495ce3..3ddb0c8 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -1745,6 +1745,7 @@ static int kvm_vcpu_release(struct inode *inode, struct file *filp)
return 0;
}
+/* cannot be const, see kvm_init */
static struct file_operations kvm_vcpu_fops = {
.release = kvm_vcpu_release,
.unlocked_ioctl = kvm_vcpu_ioctl,
@@ -2341,6 +2342,7 @@ static int kvm_vm_mmap(struct file *file, struct vm_area_struct *vma)
return 0;
}
+/* cannot be const, see kvm_init */
static struct file_operations kvm_vm_fops = {
.release = kvm_vm_release,
.unlocked_ioctl = kvm_vm_ioctl,
@@ -2428,6 +2430,7 @@ out:
return r;
}
+/* cannot be const, see kvm_init */
static struct file_operations kvm_chardev_ops = {
.unlocked_ioctl = kvm_dev_ioctl,
.compat_ioctl = kvm_dev_ioctl,
--
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