#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"
const struct address_space_operations ramfs_aops = {
.readpage = simple_readpage,
- .prepare_write = simple_prepare_write,
- .commit_write = simple_commit_write,
+ .write_begin = simple_write_begin,
+ .write_end = simple_write_end,
.set_page_dirty = __set_page_dirty_no_writeback,
};
.aio_read = generic_file_aio_read,
.write = do_sync_write,
.aio_write = generic_file_aio_write,
- .fsync = simple_sync_file,
- .sendfile = generic_file_sendfile,
+ .fsync = noop_fsync,
+ .splice_read = generic_file_splice_read,
+ .splice_write = generic_file_splice_write,
.llseek = generic_file_llseek,
};
* 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;
/* 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);
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);
unlock_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)
/* 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, size);
+ ret = simple_setsize(inode, newsize);
return ret;
}
unsigned int old_ia_valid = ia->ia_valid;
int ret = 0;
- /* 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;
+ /* POSIX UID/GID verification for setting inode attributes */
+ ret = inode_change_ok(inode, ia);
+ if (ret)
+ return ret;
/* 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)
}
}
- ret = inode_setattr(inode, ia);
+ generic_setattr(inode, ia);
out:
ia->ia_valid = old_ia_valid;
return ret;
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;
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;
}
*/
int ramfs_nommu_mmap(struct file *file, struct vm_area_struct *vma)
{
- return vma->vm_flags & VM_SHARED ? 0 : -ENOSYS;
+ if (!(vma->vm_flags & VM_SHARED))
+ return -ENOSYS;
+
+ file_accessed(file);
+ vma->vm_ops = &generic_file_vm_ops;
+ return 0;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff