ocfs: simplify symlink handling
seeing that "fast" symlinks still get allocation + copy, we might as
well simply switch them to pagecache-based variant of ->follow_link();
just need an appropriate ->readpage() for them...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/ocfs2/inode.c b/fs/ocfs2/inode.c
index 735514c..d89e08a 100644
--- a/fs/ocfs2/inode.c
+++ b/fs/ocfs2/inode.c
@@ -273,11 +273,13 @@
inode->i_gid = le32_to_cpu(fe->i_gid);
/* Fast symlinks will have i_size but no allocated clusters. */
- if (S_ISLNK(inode->i_mode) && !fe->i_clusters)
+ if (S_ISLNK(inode->i_mode) && !fe->i_clusters) {
inode->i_blocks = 0;
- else
+ inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
+ } else {
inode->i_blocks = ocfs2_inode_sector_count(inode);
- inode->i_mapping->a_ops = &ocfs2_aops;
+ inode->i_mapping->a_ops = &ocfs2_aops;
+ }
inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
@@ -331,10 +333,7 @@
OCFS2_I(inode)->ip_dir_lock_gen = 1;
break;
case S_IFLNK:
- if (ocfs2_inode_is_fast_symlink(inode))
- inode->i_op = &ocfs2_fast_symlink_inode_operations;
- else
- inode->i_op = &ocfs2_symlink_inode_operations;
+ inode->i_op = &ocfs2_symlink_inode_operations;
i_size_write(inode, le64_to_cpu(fe->i_size));
break;
default:
diff --git a/fs/ocfs2/namei.c b/fs/ocfs2/namei.c
index a9856e3..9f39c64 100644
--- a/fs/ocfs2/namei.c
+++ b/fs/ocfs2/namei.c
@@ -1724,15 +1724,16 @@
fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
inode->i_rdev = 0;
newsize = l - 1;
+ inode->i_op = &ocfs2_symlink_inode_operations;
if (l > ocfs2_fast_symlink_chars(sb)) {
u32 offset = 0;
- inode->i_op = &ocfs2_symlink_inode_operations;
status = dquot_alloc_space_nodirty(inode,
ocfs2_clusters_to_bytes(osb->sb, 1));
if (status)
goto bail;
did_quota = 1;
+ inode->i_mapping->a_ops = &ocfs2_aops;
status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
new_fe_bh,
handle, data_ac, NULL,
@@ -1750,7 +1751,7 @@
i_size_write(inode, newsize);
inode->i_blocks = ocfs2_inode_sector_count(inode);
} else {
- inode->i_op = &ocfs2_fast_symlink_inode_operations;
+ inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
memcpy((char *) fe->id2.i_symlink, symname, l);
i_size_write(inode, newsize);
inode->i_blocks = 0;
diff --git a/fs/ocfs2/symlink.c b/fs/ocfs2/symlink.c
index 5d22872..f1fbb4b 100644
--- a/fs/ocfs2/symlink.c
+++ b/fs/ocfs2/symlink.c
@@ -54,101 +54,40 @@
#include "buffer_head_io.h"
-static char *ocfs2_fast_symlink_getlink(struct inode *inode,
- struct buffer_head **bh)
+static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
{
- int status;
- char *link = NULL;
+ struct inode *inode = page->mapping->host;
+ struct buffer_head *bh;
+ int status = ocfs2_read_inode_block(inode, &bh);
struct ocfs2_dinode *fe;
+ const char *link;
+ void *kaddr;
+ size_t len;
- status = ocfs2_read_inode_block(inode, bh);
if (status < 0) {
mlog_errno(status);
- link = ERR_PTR(status);
- goto bail;
+ return status;
}
- fe = (struct ocfs2_dinode *) (*bh)->b_data;
+ fe = (struct ocfs2_dinode *) bh->b_data;
link = (char *) fe->id2.i_symlink;
-bail:
-
- return link;
-}
-
-static int ocfs2_readlink(struct dentry *dentry,
- char __user *buffer,
- int buflen)
-{
- int ret;
- char *link;
- struct buffer_head *bh = NULL;
- struct inode *inode = dentry->d_inode;
-
- link = ocfs2_fast_symlink_getlink(inode, &bh);
- if (IS_ERR(link)) {
- ret = PTR_ERR(link);
- goto out;
- }
-
- /*
- * Without vfsmount we can't update atime now,
- * but we will update atime here ultimately.
- */
- ret = vfs_readlink(dentry, buffer, buflen, link);
-
+ /* will be less than a page size */
+ len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
+ kaddr = kmap_atomic(page);
+ memcpy(kaddr, link, len + 1);
+ kunmap_atomic(kaddr);
+ SetPageUptodate(page);
+ unlock_page(page);
brelse(bh);
-out:
- if (ret < 0)
- mlog_errno(ret);
- return ret;
+ return 0;
}
-static void *ocfs2_fast_follow_link(struct dentry *dentry,
- struct nameidata *nd)
-{
- int status = 0;
- int len;
- char *target, *link = ERR_PTR(-ENOMEM);
- struct inode *inode = dentry->d_inode;
- struct buffer_head *bh = NULL;
-
- BUG_ON(!ocfs2_inode_is_fast_symlink(inode));
- target = ocfs2_fast_symlink_getlink(inode, &bh);
- if (IS_ERR(target)) {
- status = PTR_ERR(target);
- mlog_errno(status);
- goto bail;
- }
-
- /* Fast symlinks can't be large */
- len = strnlen(target, ocfs2_fast_symlink_chars(inode->i_sb));
- link = kzalloc(len + 1, GFP_NOFS);
- if (!link) {
- status = -ENOMEM;
- mlog_errno(status);
- goto bail;
- }
-
- memcpy(link, target, len);
-
-bail:
- nd_set_link(nd, status ? ERR_PTR(status) : link);
- brelse(bh);
-
- if (status)
- mlog_errno(status);
- return NULL;
-}
-
-static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
-{
- char *link = nd_get_link(nd);
- if (!IS_ERR(link))
- kfree(link);
-}
+const struct address_space_operations ocfs2_fast_symlink_aops = {
+ .readpage = ocfs2_fast_symlink_readpage,
+};
const struct inode_operations ocfs2_symlink_inode_operations = {
- .readlink = page_readlink,
+ .readlink = generic_readlink,
.follow_link = page_follow_link_light,
.put_link = page_put_link,
.getattr = ocfs2_getattr,
@@ -159,15 +98,3 @@
.removexattr = generic_removexattr,
.fiemap = ocfs2_fiemap,
};
-const struct inode_operations ocfs2_fast_symlink_inode_operations = {
- .readlink = ocfs2_readlink,
- .follow_link = ocfs2_fast_follow_link,
- .put_link = ocfs2_fast_put_link,
- .getattr = ocfs2_getattr,
- .setattr = ocfs2_setattr,
- .setxattr = generic_setxattr,
- .getxattr = generic_getxattr,
- .listxattr = ocfs2_listxattr,
- .removexattr = generic_removexattr,
- .fiemap = ocfs2_fiemap,
-};
diff --git a/fs/ocfs2/symlink.h b/fs/ocfs2/symlink.h
index 65a6c9c..71ee424 100644
--- a/fs/ocfs2/symlink.h
+++ b/fs/ocfs2/symlink.h
@@ -27,7 +27,7 @@
#define OCFS2_SYMLINK_H
extern const struct inode_operations ocfs2_symlink_inode_operations;
-extern const struct inode_operations ocfs2_fast_symlink_inode_operations;
+extern const struct address_space_operations ocfs2_fast_symlink_aops;
/*
* Test whether an inode is a fast symlink.