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>
This commit is contained in:
Al Viro
parent
408bd629ba
commit
ea022dfb3c
@ -273,11 +273,13 @@ void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
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inode->i_gid = le32_to_cpu(fe->i_gid);
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/* Fast symlinks will have i_size but no allocated clusters. */
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if (S_ISLNK(inode->i_mode) && !fe->i_clusters)
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if (S_ISLNK(inode->i_mode) && !fe->i_clusters) {
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inode->i_blocks = 0;
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else
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inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
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} else {
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inode->i_blocks = ocfs2_inode_sector_count(inode);
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inode->i_mapping->a_ops = &ocfs2_aops;
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inode->i_mapping->a_ops = &ocfs2_aops;
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}
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inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
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inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
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inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
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@ -331,10 +333,7 @@ void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
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OCFS2_I(inode)->ip_dir_lock_gen = 1;
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break;
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case S_IFLNK:
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if (ocfs2_inode_is_fast_symlink(inode))
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inode->i_op = &ocfs2_fast_symlink_inode_operations;
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else
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inode->i_op = &ocfs2_symlink_inode_operations;
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inode->i_op = &ocfs2_symlink_inode_operations;
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i_size_write(inode, le64_to_cpu(fe->i_size));
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break;
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default:
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@ -1724,15 +1724,16 @@ static int ocfs2_symlink(struct inode *dir,
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fe = (struct ocfs2_dinode *) new_fe_bh->b_data;
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inode->i_rdev = 0;
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newsize = l - 1;
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inode->i_op = &ocfs2_symlink_inode_operations;
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if (l > ocfs2_fast_symlink_chars(sb)) {
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u32 offset = 0;
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inode->i_op = &ocfs2_symlink_inode_operations;
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status = dquot_alloc_space_nodirty(inode,
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ocfs2_clusters_to_bytes(osb->sb, 1));
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if (status)
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goto bail;
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did_quota = 1;
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inode->i_mapping->a_ops = &ocfs2_aops;
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status = ocfs2_add_inode_data(osb, inode, &offset, 1, 0,
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new_fe_bh,
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handle, data_ac, NULL,
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@ -1750,7 +1751,7 @@ static int ocfs2_symlink(struct inode *dir,
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i_size_write(inode, newsize);
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inode->i_blocks = ocfs2_inode_sector_count(inode);
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} else {
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inode->i_op = &ocfs2_fast_symlink_inode_operations;
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inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
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memcpy((char *) fe->id2.i_symlink, symname, l);
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i_size_write(inode, newsize);
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inode->i_blocks = 0;
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@ -54,101 +54,40 @@
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#include "buffer_head_io.h"
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static char *ocfs2_fast_symlink_getlink(struct inode *inode,
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struct buffer_head **bh)
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static int ocfs2_fast_symlink_readpage(struct file *unused, struct page *page)
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{
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int status;
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char *link = NULL;
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struct inode *inode = page->mapping->host;
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struct buffer_head *bh;
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int status = ocfs2_read_inode_block(inode, &bh);
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struct ocfs2_dinode *fe;
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const char *link;
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void *kaddr;
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size_t len;
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status = ocfs2_read_inode_block(inode, bh);
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if (status < 0) {
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mlog_errno(status);
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link = ERR_PTR(status);
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goto bail;
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return status;
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}
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fe = (struct ocfs2_dinode *) (*bh)->b_data;
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fe = (struct ocfs2_dinode *) bh->b_data;
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link = (char *) fe->id2.i_symlink;
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bail:
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return link;
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}
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static int ocfs2_readlink(struct dentry *dentry,
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char __user *buffer,
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int buflen)
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{
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int ret;
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char *link;
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struct buffer_head *bh = NULL;
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struct inode *inode = dentry->d_inode;
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link = ocfs2_fast_symlink_getlink(inode, &bh);
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if (IS_ERR(link)) {
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ret = PTR_ERR(link);
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goto out;
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}
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/*
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* Without vfsmount we can't update atime now,
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* but we will update atime here ultimately.
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*/
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ret = vfs_readlink(dentry, buffer, buflen, link);
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/* will be less than a page size */
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len = strnlen(link, ocfs2_fast_symlink_chars(inode->i_sb));
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kaddr = kmap_atomic(page);
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memcpy(kaddr, link, len + 1);
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kunmap_atomic(kaddr);
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SetPageUptodate(page);
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unlock_page(page);
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brelse(bh);
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out:
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if (ret < 0)
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mlog_errno(ret);
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return ret;
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return 0;
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}
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static void *ocfs2_fast_follow_link(struct dentry *dentry,
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struct nameidata *nd)
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{
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int status = 0;
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int len;
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char *target, *link = ERR_PTR(-ENOMEM);
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struct inode *inode = dentry->d_inode;
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struct buffer_head *bh = NULL;
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BUG_ON(!ocfs2_inode_is_fast_symlink(inode));
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target = ocfs2_fast_symlink_getlink(inode, &bh);
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if (IS_ERR(target)) {
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status = PTR_ERR(target);
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mlog_errno(status);
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goto bail;
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}
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/* Fast symlinks can't be large */
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len = strnlen(target, ocfs2_fast_symlink_chars(inode->i_sb));
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link = kzalloc(len + 1, GFP_NOFS);
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if (!link) {
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status = -ENOMEM;
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mlog_errno(status);
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goto bail;
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}
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memcpy(link, target, len);
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bail:
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nd_set_link(nd, status ? ERR_PTR(status) : link);
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brelse(bh);
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if (status)
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mlog_errno(status);
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return NULL;
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}
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static void ocfs2_fast_put_link(struct dentry *dentry, struct nameidata *nd, void *cookie)
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{
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char *link = nd_get_link(nd);
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if (!IS_ERR(link))
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kfree(link);
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}
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const struct address_space_operations ocfs2_fast_symlink_aops = {
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.readpage = ocfs2_fast_symlink_readpage,
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};
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const struct inode_operations ocfs2_symlink_inode_operations = {
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.readlink = page_readlink,
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.readlink = generic_readlink,
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.follow_link = page_follow_link_light,
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.put_link = page_put_link,
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.getattr = ocfs2_getattr,
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@ -159,15 +98,3 @@ const struct inode_operations ocfs2_symlink_inode_operations = {
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.removexattr = generic_removexattr,
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.fiemap = ocfs2_fiemap,
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};
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const struct inode_operations ocfs2_fast_symlink_inode_operations = {
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.readlink = ocfs2_readlink,
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.follow_link = ocfs2_fast_follow_link,
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.put_link = ocfs2_fast_put_link,
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.getattr = ocfs2_getattr,
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.setattr = ocfs2_setattr,
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.listxattr = ocfs2_listxattr,
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.removexattr = generic_removexattr,
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.fiemap = ocfs2_fiemap,
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};
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@ -27,7 +27,7 @@
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#define OCFS2_SYMLINK_H
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extern const struct inode_operations ocfs2_symlink_inode_operations;
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extern const struct inode_operations ocfs2_fast_symlink_inode_operations;
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extern const struct address_space_operations ocfs2_fast_symlink_aops;
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/*
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* Test whether an inode is a fast symlink.
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