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-rw-r--r--mm/fadvise.c34
-rw-r--r--mm/fremap.c3
-rw-r--r--mm/frontswap.c34
-rw-r--r--mm/mmap.c3
-rw-r--r--mm/nommu.c6
-rw-r--r--mm/percpu.c2
-rw-r--r--mm/readahead.c14
7 files changed, 59 insertions, 37 deletions
diff --git a/mm/fadvise.c b/mm/fadvise.c
index 9b75a045dbf..a47f0f50c89 100644
--- a/mm/fadvise.c
+++ b/mm/fadvise.c
@@ -26,7 +26,7 @@
*/
SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
{
- struct file *file = fget(fd);
+ struct fd f = fdget(fd);
struct address_space *mapping;
struct backing_dev_info *bdi;
loff_t endbyte; /* inclusive */
@@ -35,15 +35,15 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
unsigned long nrpages;
int ret = 0;
- if (!file)
+ if (!f.file)
return -EBADF;
- if (S_ISFIFO(file->f_path.dentry->d_inode->i_mode)) {
+ if (S_ISFIFO(f.file->f_path.dentry->d_inode->i_mode)) {
ret = -ESPIPE;
goto out;
}
- mapping = file->f_mapping;
+ mapping = f.file->f_mapping;
if (!mapping || len < 0) {
ret = -EINVAL;
goto out;
@@ -76,21 +76,21 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
switch (advice) {
case POSIX_FADV_NORMAL:
- file->f_ra.ra_pages = bdi->ra_pages;
- spin_lock(&file->f_lock);
- file->f_mode &= ~FMODE_RANDOM;
- spin_unlock(&file->f_lock);
+ f.file->f_ra.ra_pages = bdi->ra_pages;
+ spin_lock(&f.file->f_lock);
+ f.file->f_mode &= ~FMODE_RANDOM;
+ spin_unlock(&f.file->f_lock);
break;
case POSIX_FADV_RANDOM:
- spin_lock(&file->f_lock);
- file->f_mode |= FMODE_RANDOM;
- spin_unlock(&file->f_lock);
+ spin_lock(&f.file->f_lock);
+ f.file->f_mode |= FMODE_RANDOM;
+ spin_unlock(&f.file->f_lock);
break;
case POSIX_FADV_SEQUENTIAL:
- file->f_ra.ra_pages = bdi->ra_pages * 2;
- spin_lock(&file->f_lock);
- file->f_mode &= ~FMODE_RANDOM;
- spin_unlock(&file->f_lock);
+ f.file->f_ra.ra_pages = bdi->ra_pages * 2;
+ spin_lock(&f.file->f_lock);
+ f.file->f_mode &= ~FMODE_RANDOM;
+ spin_unlock(&f.file->f_lock);
break;
case POSIX_FADV_WILLNEED:
/* First and last PARTIAL page! */
@@ -106,7 +106,7 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
* Ignore return value because fadvise() shall return
* success even if filesystem can't retrieve a hint,
*/
- force_page_cache_readahead(mapping, file, start_index,
+ force_page_cache_readahead(mapping, f.file, start_index,
nrpages);
break;
case POSIX_FADV_NOREUSE:
@@ -128,7 +128,7 @@ SYSCALL_DEFINE(fadvise64_64)(int fd, loff_t offset, loff_t len, int advice)
ret = -EINVAL;
}
out:
- fput(file);
+ fdput(f);
return ret;
}
#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
diff --git a/mm/fremap.c b/mm/fremap.c
index 9ed4fd43246..048659c0c03 100644
--- a/mm/fremap.c
+++ b/mm/fremap.c
@@ -195,10 +195,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
*/
if (mapping_cap_account_dirty(mapping)) {
unsigned long addr;
- struct file *file = vma->vm_file;
+ struct file *file = get_file(vma->vm_file);
flags &= MAP_NONBLOCK;
- get_file(file);
addr = mmap_region(file, start, size,
flags, vma->vm_flags, pgoff);
fput(file);
diff --git a/mm/frontswap.c b/mm/frontswap.c
index 6b3e71a2cd4..2890e67d602 100644
--- a/mm/frontswap.c
+++ b/mm/frontswap.c
@@ -44,6 +44,13 @@ EXPORT_SYMBOL(frontswap_enabled);
*/
static bool frontswap_writethrough_enabled __read_mostly;
+/*
+ * If enabled, the underlying tmem implementation is capable of doing
+ * exclusive gets, so frontswap_load, on a successful tmem_get must
+ * mark the page as no longer in frontswap AND mark it dirty.
+ */
+static bool frontswap_tmem_exclusive_gets_enabled __read_mostly;
+
#ifdef CONFIG_DEBUG_FS
/*
* Counters available via /sys/kernel/debug/frontswap (if debugfs is
@@ -97,6 +104,15 @@ void frontswap_writethrough(bool enable)
EXPORT_SYMBOL(frontswap_writethrough);
/*
+ * Enable/disable frontswap exclusive gets (see above).
+ */
+void frontswap_tmem_exclusive_gets(bool enable)
+{
+ frontswap_tmem_exclusive_gets_enabled = enable;
+}
+EXPORT_SYMBOL(frontswap_tmem_exclusive_gets);
+
+/*
* Called when a swap device is swapon'd.
*/
void __frontswap_init(unsigned type)
@@ -174,8 +190,13 @@ int __frontswap_load(struct page *page)
BUG_ON(sis == NULL);
if (frontswap_test(sis, offset))
ret = frontswap_ops.load(type, offset, page);
- if (ret == 0)
+ if (ret == 0) {
inc_frontswap_loads();
+ if (frontswap_tmem_exclusive_gets_enabled) {
+ SetPageDirty(page);
+ frontswap_clear(sis, offset);
+ }
+ }
return ret;
}
EXPORT_SYMBOL(__frontswap_load);
@@ -263,6 +284,11 @@ static int __frontswap_unuse_pages(unsigned long total, unsigned long *unused,
return ret;
}
+/*
+ * Used to check if it's necessory and feasible to unuse pages.
+ * Return 1 when nothing to do, 0 when need to shink pages,
+ * error code when there is an error.
+ */
static int __frontswap_shrink(unsigned long target_pages,
unsigned long *pages_to_unuse,
int *type)
@@ -275,7 +301,7 @@ static int __frontswap_shrink(unsigned long target_pages,
if (total_pages <= target_pages) {
/* Nothing to do */
*pages_to_unuse = 0;
- return 0;
+ return 1;
}
total_pages_to_unuse = total_pages - target_pages;
return __frontswap_unuse_pages(total_pages_to_unuse, pages_to_unuse, type);
@@ -292,7 +318,7 @@ static int __frontswap_shrink(unsigned long target_pages,
void frontswap_shrink(unsigned long target_pages)
{
unsigned long pages_to_unuse = 0;
- int type, ret;
+ int uninitialized_var(type), ret;
/*
* we don't want to hold swap_lock while doing a very
@@ -302,7 +328,7 @@ void frontswap_shrink(unsigned long target_pages)
spin_lock(&swap_lock);
ret = __frontswap_shrink(target_pages, &pages_to_unuse, &type);
spin_unlock(&swap_lock);
- if (ret == 0 && pages_to_unuse)
+ if (ret == 0)
try_to_unuse(type, true, pages_to_unuse);
return;
}
diff --git a/mm/mmap.c b/mm/mmap.c
index ae18a48e7e4..872441e8191 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1301,8 +1301,7 @@ munmap_back:
goto free_vma;
correct_wcount = 1;
}
- vma->vm_file = file;
- get_file(file);
+ vma->vm_file = get_file(file);
error = file->f_op->mmap(file, vma);
if (error)
goto unmap_and_free_vma;
diff --git a/mm/nommu.c b/mm/nommu.c
index d4b0c10872d..dee2ff89fd5 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -1282,10 +1282,8 @@ unsigned long do_mmap_pgoff(struct file *file,
vma->vm_pgoff = pgoff;
if (file) {
- region->vm_file = file;
- get_file(file);
- vma->vm_file = file;
- get_file(file);
+ region->vm_file = get_file(file);
+ vma->vm_file = get_file(file);
if (vm_flags & VM_EXECUTABLE) {
added_exe_file_vma(current->mm);
vma->vm_mm = current->mm;
diff --git a/mm/percpu.c b/mm/percpu.c
index bb4be7435ce..ddc5efb9c5b 100644
--- a/mm/percpu.c
+++ b/mm/percpu.c
@@ -1370,7 +1370,7 @@ int __init pcpu_setup_first_chunk(const struct pcpu_alloc_info *ai,
#ifdef CONFIG_SMP
-const char *pcpu_fc_names[PCPU_FC_NR] __initdata = {
+const char * const pcpu_fc_names[PCPU_FC_NR] __initconst = {
[PCPU_FC_AUTO] = "auto",
[PCPU_FC_EMBED] = "embed",
[PCPU_FC_PAGE] = "page",
diff --git a/mm/readahead.c b/mm/readahead.c
index ea8f8fa2164..7963f239123 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -579,19 +579,19 @@ do_readahead(struct address_space *mapping, struct file *filp,
SYSCALL_DEFINE(readahead)(int fd, loff_t offset, size_t count)
{
ssize_t ret;
- struct file *file;
+ struct fd f;
ret = -EBADF;
- file = fget(fd);
- if (file) {
- if (file->f_mode & FMODE_READ) {
- struct address_space *mapping = file->f_mapping;
+ f = fdget(fd);
+ if (f.file) {
+ if (f.file->f_mode & FMODE_READ) {
+ struct address_space *mapping = f.file->f_mapping;
pgoff_t start = offset >> PAGE_CACHE_SHIFT;
pgoff_t end = (offset + count - 1) >> PAGE_CACHE_SHIFT;
unsigned long len = end - start + 1;
- ret = do_readahead(mapping, file, start, len);
+ ret = do_readahead(mapping, f.file, start, len);
}
- fput(file);
+ fdput(f);
}
return ret;
}