mirror of https://gitee.com/openkylin/linux.git
sysv: convert to new aops
Signed-off-by: Nick Piggin <npiggin@suse.de> Cc: Christoph Hellwig <hch@lst.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Nick Piggin
Linus Torvalds
parent
be021ee41a
commit
26a6441aad
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@ -16,6 +16,7 @@
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#include <linux/pagemap.h>
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#include <linux/highmem.h>
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#include <linux/smp_lock.h>
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#include <linux/swap.h>
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#include "sysv.h"
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static int sysv_readdir(struct file *, void *, filldir_t);
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@ -37,12 +38,17 @@ static inline unsigned long dir_pages(struct inode *inode)
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return (inode->i_size+PAGE_CACHE_SIZE-1)>>PAGE_CACHE_SHIFT;
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}
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static int dir_commit_chunk(struct page *page, unsigned from, unsigned to)
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static int dir_commit_chunk(struct page *page, loff_t pos, unsigned len)
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{
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struct inode *dir = (struct inode *)page->mapping->host;
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struct address_space *mapping = page->mapping;
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struct inode *dir = mapping->host;
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int err = 0;
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page->mapping->a_ops->commit_write(NULL, page, from, to);
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block_write_end(NULL, mapping, pos, len, len, page, NULL);
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if (pos+len > dir->i_size) {
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i_size_write(dir, pos+len);
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mark_inode_dirty(dir);
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}
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if (IS_DIRSYNC(dir))
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err = write_one_page(page, 1);
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else
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@ -186,7 +192,7 @@ int sysv_add_link(struct dentry *dentry, struct inode *inode)
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unsigned long npages = dir_pages(dir);
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unsigned long n;
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char *kaddr;
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unsigned from, to;
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loff_t pos;
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int err;
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/* We take care of directory expansion in the same loop */
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@ -212,16 +218,17 @@ int sysv_add_link(struct dentry *dentry, struct inode *inode)
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return -EINVAL;
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got_it:
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from = (char*)de - (char*)page_address(page);
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to = from + SYSV_DIRSIZE;
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pos = page_offset(page) +
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(char*)de - (char*)page_address(page);
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lock_page(page);
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err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
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err = __sysv_write_begin(NULL, page->mapping, pos, SYSV_DIRSIZE,
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AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
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if (err)
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goto out_unlock;
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memcpy (de->name, name, namelen);
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memset (de->name + namelen, 0, SYSV_DIRSIZE - namelen - 2);
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de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
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err = dir_commit_chunk(page, from, to);
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err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
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dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
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mark_inode_dirty(dir);
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out_page:
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@ -238,15 +245,15 @@ int sysv_delete_entry(struct sysv_dir_entry *de, struct page *page)
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struct address_space *mapping = page->mapping;
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struct inode *inode = (struct inode*)mapping->host;
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char *kaddr = (char*)page_address(page);
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unsigned from = (char*)de - kaddr;
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unsigned to = from + SYSV_DIRSIZE;
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loff_t pos = page_offset(page) + (char *)de - kaddr;
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int err;
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lock_page(page);
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err = mapping->a_ops->prepare_write(NULL, page, from, to);
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err = __sysv_write_begin(NULL, mapping, pos, SYSV_DIRSIZE,
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AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
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BUG_ON(err);
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de->inode = 0;
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err = dir_commit_chunk(page, from, to);
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err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
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dir_put_page(page);
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inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
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mark_inode_dirty(inode);
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@ -263,12 +270,13 @@ int sysv_make_empty(struct inode *inode, struct inode *dir)
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if (!page)
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return -ENOMEM;
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kmap(page);
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err = mapping->a_ops->prepare_write(NULL, page, 0, 2 * SYSV_DIRSIZE);
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err = __sysv_write_begin(NULL, mapping, 0, 2 * SYSV_DIRSIZE,
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AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
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if (err) {
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unlock_page(page);
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goto fail;
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}
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kmap(page);
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base = (char*)page_address(page);
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memset(base, 0, PAGE_CACHE_SIZE);
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@ -280,9 +288,9 @@ int sysv_make_empty(struct inode *inode, struct inode *dir)
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de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), dir->i_ino);
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strcpy(de->name,"..");
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kunmap(page);
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err = dir_commit_chunk(page, 0, 2 * SYSV_DIRSIZE);
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fail:
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kunmap(page);
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page_cache_release(page);
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return err;
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}
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@ -336,16 +344,18 @@ int sysv_empty_dir(struct inode * inode)
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void sysv_set_link(struct sysv_dir_entry *de, struct page *page,
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struct inode *inode)
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{
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struct inode *dir = (struct inode*)page->mapping->host;
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unsigned from = (char *)de-(char*)page_address(page);
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unsigned to = from + SYSV_DIRSIZE;
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struct address_space *mapping = page->mapping;
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struct inode *dir = mapping->host;
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loff_t pos = page_offset(page) +
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(char *)de-(char*)page_address(page);
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int err;
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lock_page(page);
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err = page->mapping->a_ops->prepare_write(NULL, page, from, to);
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err = __sysv_write_begin(NULL, mapping, pos, SYSV_DIRSIZE,
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AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
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BUG_ON(err);
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de->inode = cpu_to_fs16(SYSV_SB(inode->i_sb), inode->i_ino);
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err = dir_commit_chunk(page, from, to);
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err = dir_commit_chunk(page, pos, SYSV_DIRSIZE);
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dir_put_page(page);
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dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
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mark_inode_dirty(dir);
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@ -453,23 +453,38 @@ static int sysv_writepage(struct page *page, struct writeback_control *wbc)
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{
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return block_write_full_page(page,get_block,wbc);
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}
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static int sysv_readpage(struct file *file, struct page *page)
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{
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return block_read_full_page(page,get_block);
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}
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static int sysv_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
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int __sysv_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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return block_prepare_write(page,from,to,get_block);
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return block_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
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get_block);
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}
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static int sysv_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata)
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{
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*pagep = NULL;
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return __sysv_write_begin(file, mapping, pos, len, flags, pagep, fsdata);
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}
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static sector_t sysv_bmap(struct address_space *mapping, sector_t block)
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{
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return generic_block_bmap(mapping,block,get_block);
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}
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const struct address_space_operations sysv_aops = {
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.readpage = sysv_readpage,
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.writepage = sysv_writepage,
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.sync_page = block_sync_page,
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.prepare_write = sysv_prepare_write,
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.commit_write = generic_commit_write,
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.write_begin = sysv_write_begin,
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.write_end = generic_write_end,
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.bmap = sysv_bmap
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};
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@ -136,6 +136,9 @@ extern unsigned long sysv_count_free_blocks(struct super_block *);
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/* itree.c */
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extern void sysv_truncate(struct inode *);
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extern int __sysv_write_begin(struct file *file, struct address_space *mapping,
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loff_t pos, unsigned len, unsigned flags,
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struct page **pagep, void **fsdata);
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/* inode.c */
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extern int sysv_write_inode(struct inode *, int);
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