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Diffstat (limited to 'fs/ramfs/file-nommu.c')
-rw-r--r--fs/ramfs/file-nommu.c134
1 files changed, 48 insertions, 86 deletions
diff --git a/fs/ramfs/file-nommu.c b/fs/ramfs/file-nommu.c
index 0989bc2c2f6..dda012ad420 100644
--- a/fs/ramfs/file-nommu.c
+++ b/fs/ramfs/file-nommu.c
@@ -18,31 +18,32 @@
#include <linux/string.h>
#include <linux/backing-dev.h>
#include <linux/ramfs.h>
-#include <linux/quotaops.h>
#include <linux/pagevec.h>
#include <linux/mman.h>
+#include <linux/sched.h>
+#include <linux/slab.h>
#include <asm/uaccess.h>
#include "internal.h"
static int ramfs_nommu_setattr(struct dentry *, struct iattr *);
-
-const struct address_space_operations ramfs_aops = {
- .readpage = simple_readpage,
- .write_begin = simple_write_begin,
- .write_end = simple_write_end,
- .set_page_dirty = __set_page_dirty_no_writeback,
-};
+static unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
+ unsigned long addr,
+ unsigned long len,
+ unsigned long pgoff,
+ unsigned long flags);
+static int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma);
const struct file_operations ramfs_file_operations = {
.mmap = ramfs_nommu_mmap,
.get_unmapped_area = ramfs_nommu_get_unmapped_area,
- .read = do_sync_read,
- .aio_read = generic_file_aio_read,
- .write = do_sync_write,
- .aio_write = generic_file_aio_write,
- .fsync = simple_sync_file,
+ .read = new_sync_read,
+ .read_iter = generic_file_read_iter,
+ .write = new_sync_write,
+ .write_iter = generic_file_write_iter,
+ .fsync = noop_fsync,
.splice_read = generic_file_splice_read,
+ .splice_write = iter_file_splice_write,
.llseek = generic_file_llseek,
};
@@ -57,10 +58,9 @@ const struct inode_operations ramfs_file_inode_operations = {
* size 0 on the assumption that it's going to be used for an mmap of shared
* memory
*/
-static int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
+int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
{
- struct pagevec lru_pvec;
- unsigned long npages, xpages, loop, limit;
+ unsigned long npages, xpages, loop;
struct page *pages;
unsigned order;
void *data;
@@ -69,14 +69,11 @@ static int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
/* make various checks */
order = get_order(newsize);
if (unlikely(order >= MAX_ORDER))
- goto too_big;
+ return -EFBIG;
- limit = current->signal->rlim[RLIMIT_FSIZE].rlim_cur;
- if (limit != RLIM_INFINITY && newsize > limit)
- goto fsize_exceeded;
-
- if (newsize > inode->i_sb->s_maxbytes)
- goto too_big;
+ ret = inode_newsize_ok(inode, newsize);
+ if (ret)
+ return ret;
i_size_write(inode, newsize);
@@ -102,61 +99,32 @@ static int ramfs_nommu_expand_for_mapping(struct inode *inode, size_t newsize)
memset(data, 0, newsize);
/* attach all the pages to the inode's address space */
- pagevec_init(&lru_pvec, 0);
for (loop = 0; loop < npages; loop++) {
struct page *page = pages + loop;
- ret = add_to_page_cache(page, inode->i_mapping, loop, GFP_KERNEL);
+ ret = add_to_page_cache_lru(page, inode->i_mapping, loop,
+ GFP_KERNEL);
if (ret < 0)
goto add_error;
- if (!pagevec_add(&lru_pvec, page))
- __pagevec_lru_add(&lru_pvec);
+ /* prevent the page from being discarded on memory pressure */
+ SetPageDirty(page);
+ SetPageUptodate(page);
unlock_page(page);
+ put_page(page);
}
- pagevec_lru_add(&lru_pvec);
return 0;
- fsize_exceeded:
- send_sig(SIGXFSZ, current, 0);
- too_big:
- return -EFBIG;
-
- add_error:
- page_cache_release(pages + loop);
- for (loop++; loop < npages; loop++)
- __free_page(pages + loop);
+add_error:
+ while (loop < npages)
+ __free_page(pages + loop++);
return ret;
}
/*****************************************************************************/
/*
- * check that file shrinkage doesn't leave any VMAs dangling in midair
- */
-static int ramfs_nommu_check_mappings(struct inode *inode,
- size_t newsize, size_t size)
-{
- struct vm_area_struct *vma;
- struct prio_tree_iter iter;
-
- /* search for VMAs that fall within the dead zone */
- vma_prio_tree_foreach(vma, &iter, &inode->i_mapping->i_mmap,
- newsize >> PAGE_SHIFT,
- (size + PAGE_SIZE - 1) >> PAGE_SHIFT
- ) {
- /* found one - only interested if it's shared out of the page
- * cache */
- if (vma->vm_flags & VM_SHARED)
- return -ETXTBSY; /* not quite true, but near enough */
- }
-
- return 0;
-}
-
-/*****************************************************************************/
-/*
*
*/
static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size)
@@ -174,14 +142,13 @@ static int ramfs_nommu_resize(struct inode *inode, loff_t newsize, loff_t size)
/* check that a decrease in size doesn't cut off any shared mappings */
if (newsize < size) {
- ret = ramfs_nommu_check_mappings(inode, newsize, size);
+ ret = nommu_shrink_inode_mappings(inode, size, newsize);
if (ret < 0)
return ret;
}
- ret = vmtruncate(inode, newsize);
-
- return ret;
+ truncate_setsize(inode, newsize);
+ return 0;
}
/*****************************************************************************/
@@ -200,14 +167,10 @@ static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
if (ret)
return ret;
- /* by providing our own setattr() method, we skip this quotaism */
- if ((old_ia_valid & ATTR_UID && ia->ia_uid != inode->i_uid) ||
- (old_ia_valid & ATTR_GID && ia->ia_gid != inode->i_gid))
- ret = DQUOT_TRANSFER(inode, ia) ? -EDQUOT : 0;
-
/* pick out size-changing events */
if (ia->ia_valid & ATTR_SIZE) {
- loff_t size = i_size_read(inode);
+ loff_t size = inode->i_size;
+
if (ia->ia_size != size) {
ret = ramfs_nommu_resize(inode, ia->ia_size, size);
if (ret < 0 || ia->ia_valid == ATTR_SIZE)
@@ -220,7 +183,7 @@ static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
}
}
- ret = inode_setattr(inode, ia);
+ setattr_copy(inode, ia);
out:
ia->ia_valid = old_ia_valid;
return ret;
@@ -233,12 +196,12 @@ static int ramfs_nommu_setattr(struct dentry *dentry, struct iattr *ia)
* - the pages to be mapped must exist
* - the pages be physically contiguous in sequence
*/
-unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
+static unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
unsigned long addr, unsigned long len,
unsigned long pgoff, unsigned long flags)
{
unsigned long maxpages, lpages, nr, loop, ret;
- struct inode *inode = file->f_path.dentry->d_inode;
+ struct inode *inode = file_inode(file);
struct page **pages = NULL, **ptr, *page;
loff_t isize;
@@ -261,11 +224,11 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
ret = -ENOMEM;
pages = kzalloc(lpages * sizeof(struct page *), GFP_KERNEL);
if (!pages)
- goto out;
+ goto out_free;
nr = find_get_pages(inode->i_mapping, pgoff, lpages, pages);
if (nr != lpages)
- goto out; /* leave if some pages were missing */
+ goto out_free_pages; /* leave if some pages were missing */
/* check the pages for physical adjacency */
ptr = pages;
@@ -273,19 +236,18 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
page++;
for (loop = lpages; loop > 1; loop--)
if (*ptr++ != page++)
- goto out;
+ goto out_free_pages;
/* okay - all conditions fulfilled */
ret = (unsigned long) page_address(pages[0]);
- out:
- if (pages) {
- ptr = pages;
- for (loop = lpages; loop > 0; loop--)
- put_page(*ptr++);
- kfree(pages);
- }
-
+out_free_pages:
+ ptr = pages;
+ for (loop = nr; loop > 0; loop--)
+ put_page(*ptr++);
+out_free:
+ kfree(pages);
+out:
return ret;
}
@@ -293,7 +255,7 @@ unsigned long ramfs_nommu_get_unmapped_area(struct file *file,
/*
* set up a mapping for shared memory segments
*/
-int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
+static int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
{
if (!(vma->vm_flags & VM_SHARED))
return -ENOSYS;
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-11-10 03:42:52 +0000