__mnt_want

Name:__mnt_want_write - get write access to a mount without freeze protection*@m: the mount on which to take a write* This tells the low-level filesystem that a write is about to be performed to* it, and makes sure that writes are allowed (mnt it read-write)

Proto:int __mnt_want_write(struct vfsmount *m)

Type:int

Parameter:

Type	Parameter	Name
struct vfsmount *	m

313

mnt = real_mount(m)

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ret = 0

316

Even if we don't have any preemption, we need preempt disable/enable* to be barriers, so that we don't have things like get_user/put_user* that can cause faults and scheduling migrate into our preempt-protected* region.()

317

mnt_inc_writers(mnt)

323

smp_mb()

324

When READ_ONCE(mnt_flags) & MNT_WRITE_HOLD cycle

325

cpu_relax()

331

smp_rmb()

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If mnt_is_readonly(m) Then

333

mnt_dec_writers(mnt)

334

ret = -EROFS

336

preempt_enable()

338

Return ret

**Caller**
Name	Describe
touch_atime
mnt_want_write	mnt_want_write - get write access to a mount@m: the mount on which to take a write This tells the low-level filesystem that a write is about to be performed to* it, and makes sure that writes are allowed (mount is read-write, filesystem
__mnt_want_write_file	__mnt_want_write_file - get write access to a file's mount@file: the file who's mount on which to take a write This is like __mnt_want_write, but it takes a file and can* do some optimisations if the file is open for write already

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