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ANDROID: ashmem: Add shmem_set_file to mm/shmem.c

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NOT FOR STAGING
This patch re-adds the original shmem_set_file to mm/shmem.c
and converts ashmem.c back to using it.

Change-Id: Ie604c9f8f4d0ee6bc2aae1a96d261c8373a1a2dc
CC: Brian Swetland <swetland@google.com>
CC: Colin Cross <ccross@android.com>
CC: Arve Hjønnevåg <arve@android.com>
CC: Dima Zavin <dima@android.com>
CC: Robert Love <rlove@google.com>
CC: Greg KH <greg@kroah.com>
Signed-off-by: John Stultz <john.stultz@linaro.org>
This commit is contained in:
John Stultz 2011-12-15 18:51:04 -08:00 committed by Amit Pundir
parent 72818893ef
commit 5e1676886d
3 changed files with 17 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/staging/android/ashmem.c
View File

@ -414,22 +414,14 @@ static int ashmem_mmap(struct file *file, struct vm_area_struct *vma)
}
get_file(asma->file);
/*
* XXX - Reworked to use shmem_zero_setup() instead of
* shmem_set_file while we're in staging. -jstultz
*/
if (vma->vm_flags & VM_SHARED) {
ret = shmem_zero_setup(vma);
if (ret) {
fput(asma->file);
goto out;
}
if (vma->vm_flags & VM_SHARED)
shmem_set_file(vma, asma->file);
else {
if (vma->vm_file)
fput(vma->vm_file);
vma->vm_file = asma->file;
}
if (vma->vm_file)
fput(vma->vm_file);
vma->vm_file = asma->file;
out:
mutex_unlock(&ashmem_mutex);
return ret;

3
include/linux/mm.h
View File

@ -356,7 +356,7 @@ enum page_entry_size {
/*
* These are the virtual MM functions - opening of an area, closing and
* unmapping it (needed to keep files on disk up-to-date etc), pointer
* to the functions called when a no-page or a wp-page exception occurs.
* to the functions called when a no-page or a wp-page exception occurs.
*/
struct vm_operations_struct {
void (*open)(struct vm_area_struct * area);
@ -1181,6 +1181,7 @@ extern void pagefault_out_of_memory(void);
#define SHOW_MEM_FILTER_NODES (0x0001u) /* disallowed nodes */
extern void show_free_areas(unsigned int flags, nodemask_t *nodemask);
void shmem_set_file(struct vm_area_struct *vma, struct file *file);
extern bool can_do_mlock(void);
extern int user_shm_lock(size_t, struct user_struct *);

13
mm/shmem.c
View File

@ -4216,6 +4216,14 @@ struct file *shmem_file_setup(const char *name, loff_t size, unsigned long flags
}
EXPORT_SYMBOL_GPL(shmem_file_setup);
void shmem_set_file(struct vm_area_struct *vma, struct file *file)
{
if (vma->vm_file)
fput(vma->vm_file);
vma->vm_file = file;
vma->vm_ops = &shmem_vm_ops;
}
/**
* shmem_zero_setup - setup a shared anonymous mapping
* @vma: the vma to be mmapped is prepared by do_mmap_pgoff
@ -4235,10 +4243,7 @@ int shmem_zero_setup(struct vm_area_struct *vma)
if (IS_ERR(file))
return PTR_ERR(file);
if (vma->vm_file)
fput(vma->vm_file);
vma->vm_file = file;
vma->vm_ops = &shmem_vm_ops;
shmem_set_file(vma, file);
if (IS_ENABLED(CONFIG_TRANSPARENT_HUGE_PAGECACHE) &&
((vma->vm_start + ~HPAGE_PMD_MASK) & HPAGE_PMD_MASK) <