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erofs: use meta buffers for xattr operations 

Get rid of old erofs_get_meta_page() within xattr operations by
using on-stack meta buffers in order to prepare subpage and folio
features.

Link: https://lore.kernel.org/r/20220102040017.51352-5-hsiangkao@linux.alibaba.com
Reviewed-by: Liu Bo <bo.liu@linux.alibaba.com>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2022-01-02 12:00:16 +08:00
parent 2b5379f786
commit bb88e8da00
2 changed files with 41 additions and 95 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

135
fs/erofs/xattr.c
View File

@ -2,39 +2,20 @@
/*
* Copyright (C) 2017-2018 HUAWEI, Inc.
* https://www.huawei.com/
* Copyright (C) 2021-2022, Alibaba Cloud
*/
#include <linux/security.h>
#include "xattr.h"
struct xattr_iter {
struct super_block *sb;
struct page *page;
struct erofs_buf buf;
void *kaddr;
erofs_blk_t blkaddr;
unsigned int ofs;
};
static inline void xattr_iter_end(struct xattr_iter *it, bool atomic)
{
/* the only user of kunmap() is 'init_inode_xattrs' */
if (!atomic)
kunmap(it->page);
else
kunmap_atomic(it->kaddr);
unlock_page(it->page);
put_page(it->page);
}
static inline void xattr_iter_end_final(struct xattr_iter *it)
{
if (!it->page)
return;
xattr_iter_end(it, true);
}
static int init_inode_xattrs(struct inode *inode)
{
struct erofs_inode *const vi = EROFS_I(inode);
@ -43,7 +24,6 @@ static int init_inode_xattrs(struct inode *inode)
struct erofs_xattr_ibody_header *ih;
struct super_block *sb;
struct erofs_sb_info *sbi;
bool atomic_map;
int ret = 0;
/* the most case is that xattrs of this inode are initialized. */
@ -91,26 +71,23 @@ static int init_inode_xattrs(struct inode *inode)
sb = inode->i_sb;
sbi = EROFS_SB(sb);
it.buf = __EROFS_BUF_INITIALIZER;
it.blkaddr = erofs_blknr(iloc(sbi, vi->nid) + vi->inode_isize);
it.ofs = erofs_blkoff(iloc(sbi, vi->nid) + vi->inode_isize);
it.page = erofs_get_meta_page(sb, it.blkaddr);
if (IS_ERR(it.page)) {
ret = PTR_ERR(it.page);
/* read in shared xattr array (non-atomic, see kmalloc below) */
it.kaddr = erofs_read_metabuf(&it.buf, sb, it.blkaddr, EROFS_KMAP);
if (IS_ERR(it.kaddr)) {
ret = PTR_ERR(it.kaddr);
goto out_unlock;
}
/* read in shared xattr array (non-atomic, see kmalloc below) */
it.kaddr = kmap(it.page);
atomic_map = false;
ih = (struct erofs_xattr_ibody_header *)(it.kaddr + it.ofs);
vi->xattr_shared_count = ih->h_shared_count;
vi->xattr_shared_xattrs = kmalloc_array(vi->xattr_shared_count,
sizeof(uint), GFP_KERNEL);
if (!vi->xattr_shared_xattrs) {
xattr_iter_end(&it, atomic_map);
erofs_put_metabuf(&it.buf);
ret = -ENOMEM;
goto out_unlock;
}
@ -122,25 +99,22 @@ static int init_inode_xattrs(struct inode *inode)
if (it.ofs >= EROFS_BLKSIZ) {
/* cannot be unaligned */
DBG_BUGON(it.ofs != EROFS_BLKSIZ);
xattr_iter_end(&it, atomic_map);
it.page = erofs_get_meta_page(sb, ++it.blkaddr);
if (IS_ERR(it.page)) {
it.kaddr = erofs_read_metabuf(&it.buf, sb, ++it.blkaddr,
EROFS_KMAP);
if (IS_ERR(it.kaddr)) {
kfree(vi->xattr_shared_xattrs);
vi->xattr_shared_xattrs = NULL;
ret = PTR_ERR(it.page);
ret = PTR_ERR(it.kaddr);
goto out_unlock;
}
it.kaddr = kmap_atomic(it.page);
atomic_map = true;
it.ofs = 0;
}
vi->xattr_shared_xattrs[i] =
le32_to_cpu(*(__le32 *)(it.kaddr + it.ofs));
it.ofs += sizeof(__le32);
}
xattr_iter_end(&it, atomic_map);
erofs_put_metabuf(&it.buf);
/* paired with smp_mb() at the beginning of the function. */
smp_mb();
@ -172,19 +146,11 @@ static inline int xattr_iter_fixup(struct xattr_iter *it)
if (it->ofs < EROFS_BLKSIZ)
return 0;
xattr_iter_end(it, true);
it->blkaddr += erofs_blknr(it->ofs);
it->page = erofs_get_meta_page(it->sb, it->blkaddr);
if (IS_ERR(it->page)) {
int err = PTR_ERR(it->page);
it->page = NULL;
return err;
}
it->kaddr = kmap_atomic(it->page);
it->kaddr = erofs_read_metabuf(&it->buf, it->sb, it->blkaddr,
EROFS_KMAP_ATOMIC);
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
it->ofs = erofs_blkoff(it->ofs);
return 0;
}
@ -207,11 +173,10 @@ static int inline_xattr_iter_begin(struct xattr_iter *it,
it->blkaddr = erofs_blknr(iloc(sbi, vi->nid) + inline_xattr_ofs);
it->ofs = erofs_blkoff(iloc(sbi, vi->nid) + inline_xattr_ofs);
it->page = erofs_get_meta_page(inode->i_sb, it->blkaddr);
if (IS_ERR(it->page))
return PTR_ERR(it->page);
it->kaddr = kmap_atomic(it->page);
it->kaddr = erofs_read_metabuf(&it->buf, inode->i_sb, it->blkaddr,
EROFS_KMAP_ATOMIC);
if (IS_ERR(it->kaddr))
return PTR_ERR(it->kaddr);
return vi->xattr_isize - xattr_header_sz;
}
@ -272,7 +237,7 @@ static int xattr_foreach(struct xattr_iter *it,
it->ofs = 0;
}
slice = min_t(unsigned int, PAGE_SIZE - it->ofs,
slice = min_t(unsigned int, EROFS_BLKSIZ - it->ofs,
entry.e_name_len - processed);
/* handle name */
@ -307,7 +272,7 @@ static int xattr_foreach(struct xattr_iter *it,
it->ofs = 0;
}
slice = min_t(unsigned int, PAGE_SIZE - it->ofs,
slice = min_t(unsigned int, EROFS_BLKSIZ - it->ofs,
value_sz - processed);
op->value(it, processed, it->kaddr + it->ofs, slice);
it->ofs += slice;
@ -386,8 +351,6 @@ static int inline_getxattr(struct inode *inode, struct getxattr_iter *it)
if (ret != -ENOATTR)
break;
}
xattr_iter_end_final(&it->it);
return ret ? ret : it->buffer_size;
}
@ -404,26 +367,16 @@ static int shared_getxattr(struct inode *inode, struct getxattr_iter *it)
xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]);
it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
if (!i || blkaddr != it->it.blkaddr) {
if (i)
xattr_iter_end(&it->it, true);
it->it.page = erofs_get_meta_page(sb, blkaddr);
if (IS_ERR(it->it.page))
return PTR_ERR(it->it.page);
it->it.kaddr = kmap_atomic(it->it.page);
it->it.blkaddr = blkaddr;
}
it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr,
EROFS_KMAP_ATOMIC);
if (IS_ERR(it->it.kaddr))
return PTR_ERR(it->it.kaddr);
it->it.blkaddr = blkaddr;
ret = xattr_foreach(&it->it, &find_xattr_handlers, NULL);
if (ret != -ENOATTR)
break;
}
if (vi->xattr_shared_count)
xattr_iter_end_final(&it->it);
return ret ? ret : it->buffer_size;
}
@ -452,10 +405,11 @@ int erofs_getxattr(struct inode *inode, int index,
return ret;
it.index = index;
it.name.len = strlen(name);
if (it.name.len > EROFS_NAME_LEN)
return -ERANGE;
it.it.buf = __EROFS_BUF_INITIALIZER;
it.name.name = name;
it.buffer = buffer;
@ -465,6 +419,7 @@ int erofs_getxattr(struct inode *inode, int index,
ret = inline_getxattr(inode, &it);
if (ret == -ENOATTR)
ret = shared_getxattr(inode, &it);
erofs_put_metabuf(&it.it.buf);
return ret;
}
@ -607,7 +562,6 @@ static int inline_listxattr(struct listxattr_iter *it)
if (ret)
break;
}
xattr_iter_end_final(&it->it);
return ret ? ret : it->buffer_ofs;
}
@ -625,25 +579,16 @@ static int shared_listxattr(struct listxattr_iter *it)
xattrblock_addr(sbi, vi->xattr_shared_xattrs[i]);
it->it.ofs = xattrblock_offset(sbi, vi->xattr_shared_xattrs[i]);
if (!i || blkaddr != it->it.blkaddr) {
if (i)
xattr_iter_end(&it->it, true);
it->it.page = erofs_get_meta_page(sb, blkaddr);
if (IS_ERR(it->it.page))
return PTR_ERR(it->it.page);
it->it.kaddr = kmap_atomic(it->it.page);
it->it.blkaddr = blkaddr;
}
it->it.kaddr = erofs_read_metabuf(&it->it.buf, sb, blkaddr,
EROFS_KMAP_ATOMIC);
if (IS_ERR(it->it.kaddr))
return PTR_ERR(it->it.kaddr);
it->it.blkaddr = blkaddr;
ret = xattr_foreach(&it->it, &list_xattr_handlers, NULL);
if (ret)
break;
}
if (vi->xattr_shared_count)
xattr_iter_end_final(&it->it);
return ret ? ret : it->buffer_ofs;
}
@ -659,6 +604,7 @@ ssize_t erofs_listxattr(struct dentry *dentry,
if (ret)
return ret;
it.it.buf = __EROFS_BUF_INITIALIZER;
it.dentry = dentry;
it.buffer = buffer;
it.buffer_size = buffer_size;
@ -667,9 +613,10 @@ ssize_t erofs_listxattr(struct dentry *dentry,
it.it.sb = dentry->d_sb;
ret = inline_listxattr(&it);
if (ret < 0 && ret != -ENOATTR)
return ret;
return shared_listxattr(&it);
if (ret >= 0 || ret == -ENOATTR)
ret = shared_listxattr(&it);
erofs_put_metabuf(&it.it.buf);
return ret;
}
#ifdef CONFIG_EROFS_FS_POSIX_ACL

1
fs/erofs/xattr.h
View File

@ -86,4 +86,3 @@ struct posix_acl *erofs_get_acl(struct inode *inode, int type, bool rcu);
#endif
#endif