.fsync = generic_file_fsync,
};
-inline void dir_put_page(struct page *page)
+inline void dir_put_page(struct page *page, void *page_addr)
{
- kunmap(page);
+ kunmap_local((void *)((unsigned long)page_addr & PAGE_MASK));
put_page(page);
}
return err;
}
+/*
+ * Calls to dir_get_page()/dir_put_page() must be nested according to the
+ * rules documented in mm/highmem.rst.
+ *
+ * NOTE: sysv_find_entry() and sysv_dotdot() act as calls to dir_get_page()
+ * and must be treated accordingly for nesting purposes.
+ */
static void *dir_get_page(struct inode *dir, unsigned long n, struct page **p)
{
struct address_space *mapping = dir->i_mapping;
struct page *page = read_mapping_page(mapping, n, NULL);
if (IS_ERR(page))
return ERR_CAST(page);
- kmap(page);
*p = page;
- return page_address(page);
+ return kmap_local_page(page);
}
static int sysv_readdir(struct file *file, struct dir_context *ctx)
if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
fs16_to_cpu(SYSV_SB(sb), de->inode),
DT_UNKNOWN)) {
- dir_put_page(page);
+ dir_put_page(page, kaddr);
return 0;
}
}
- dir_put_page(page);
+ dir_put_page(page, kaddr);
}
return 0;
}
* returns the cache buffer in which the entry was found, and the entry
* itself (as a parameter - res_dir). It does NOT read the inode of the
* entry - you'll have to do that yourself if you want to.
+ *
+ * On Success dir_put_page() should be called on *res_page.
+ *
+ * sysv_find_entry() acts as a call to dir_get_page() and must be treated
+ * accordingly for nesting purposes.
*/
struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_page)
{
name, de->name))
goto found;
}
- dir_put_page(page);
+ dir_put_page(page, kaddr);
}
if (++n >= npages)
goto out_page;
de++;
}
- dir_put_page(page);
+ dir_put_page(page, kaddr);
}
BUG();
return -EINVAL;
mark_inode_dirty(dir);
err = sysv_handle_dirsync(dir);
out_page:
- dir_put_page(page);
+ dir_put_page(page, kaddr);
return err;
out_unlock:
unlock_page(page);
BUG_ON(err);
de->inode = 0;
dir_commit_chunk(page, pos, SYSV_DIRSIZE);
- dir_put_page(page);
+ dir_put_page(page, de);
inode->i_ctime = inode->i_mtime = current_time(inode);
mark_inode_dirty(inode);
return sysv_handle_dirsync(inode);
unlock_page(page);
goto fail;
}
- kmap(page);
-
- base = (char*)page_address(page);
+ base = kmap_local_page(page);
memset(base, 0, PAGE_SIZE);
de = (struct sysv_dir_entry *) base;
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
strcpy(de->name,"..");
- kunmap(page);
+ kunmap_local(base);
dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
err = sysv_handle_dirsync(inode);
fail:
struct super_block *sb = inode->i_sb;
struct page *page = NULL;
unsigned long i, npages = dir_pages(inode);
+ char *kaddr;
for (i = 0; i < npages; i++) {
- char *kaddr;
- struct sysv_dir_entry * de;
+ struct sysv_dir_entry *de;
kaddr = dir_get_page(inode, i, &page);
if (IS_ERR(kaddr))
if (de->name[1] != '.' || de->name[2])
goto not_empty;
}
- dir_put_page(page);
+ dir_put_page(page, kaddr);
}
return 1;
not_empty:
- dir_put_page(page);
+ dir_put_page(page, kaddr);
return 0;
}
BUG_ON(err);
de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
dir_commit_chunk(page, pos, SYSV_DIRSIZE);
- dir_put_page(page);
+ dir_put_page(page, de);
dir->i_mtime = dir->i_ctime = current_time(dir);
mark_inode_dirty(dir);
sysv_handle_dirsync(inode);
}
+/*
+ * Calls to dir_get_page()/dir_put_page() must be nested according to the
+ * rules documented in mm/highmem.rst.
+ *
+ * sysv_dotdot() acts as a call to dir_get_page() and must be treated
+ * accordingly for nesting purposes.
+ */
struct sysv_dir_entry *sysv_dotdot(struct inode *dir, struct page **p)
{
struct sysv_dir_entry *de = dir_get_page(dir, 0, p);
if (de) {
res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
- dir_put_page(page);
+ dir_put_page(page, de);
}
return res;
}