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fs/9p: simplify iget to remove unnecessary paths
Remove the additional comparison operators and switch to simply lookup by inode number (aka qid.path). Signed-off-by: Eric Van Hensbergen <ericvh@kernel.org>
This commit is contained in:
Eric Van Hensbergen
parent
b91a26696e
commit
724a08450f
31
fs/9p/v9fs.h
31
fs/9p/v9fs.h
@ -179,16 +179,13 @@ extern int v9fs_vfs_rename(struct mnt_idmap *idmap,
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struct inode *old_dir, struct dentry *old_dentry,
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struct inode *new_dir, struct dentry *new_dentry,
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unsigned int flags);
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extern struct inode *v9fs_inode_from_fid(struct v9fs_session_info *v9ses,
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struct p9_fid *fid,
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struct super_block *sb, int new);
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extern struct inode *v9fs_fid_iget(struct super_block *sb, struct p9_fid *fid);
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extern const struct inode_operations v9fs_dir_inode_operations_dotl;
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extern const struct inode_operations v9fs_file_inode_operations_dotl;
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extern const struct inode_operations v9fs_symlink_inode_operations_dotl;
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extern const struct netfs_request_ops v9fs_req_ops;
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extern struct inode *v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses,
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struct p9_fid *fid,
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struct super_block *sb, int new);
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extern struct inode *v9fs_fid_iget_dotl(struct super_block *sb,
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struct p9_fid *fid);
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/* other default globals */
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#define V9FS_PORT 564
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@ -230,27 +227,9 @@ v9fs_get_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
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struct super_block *sb)
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{
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if (v9fs_proto_dotl(v9ses))
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return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 0);
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return v9fs_fid_iget_dotl(sb, fid);
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else
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return v9fs_inode_from_fid(v9ses, fid, sb, 0);
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}
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/**
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* v9fs_get_new_inode_from_fid - Helper routine to populate an inode by
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* issuing a attribute request
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* @v9ses: session information
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* @fid: fid to issue attribute request for
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* @sb: superblock on which to create inode
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*
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*/
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static inline struct inode *
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v9fs_get_new_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
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struct super_block *sb)
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{
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if (v9fs_proto_dotl(v9ses))
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return v9fs_inode_from_fid_dotl(v9ses, fid, sb, 1);
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else
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return v9fs_inode_from_fid(v9ses, fid, sb, 1);
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return v9fs_fid_iget(sb, fid);
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}
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#endif
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@ -42,7 +42,7 @@ struct inode *v9fs_alloc_inode(struct super_block *sb);
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void v9fs_free_inode(struct inode *inode);
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void v9fs_set_netfs_context(struct inode *inode);
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int v9fs_init_inode(struct v9fs_session_info *v9ses,
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struct inode *inode, umode_t mode, dev_t rdev);
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struct inode *inode, struct p9_qid *qid, umode_t mode, dev_t rdev);
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void v9fs_evict_inode(struct inode *inode);
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#if (BITS_PER_LONG == 32)
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#define QID2INO(q) ((ino_t) (((q)->path+2) ^ (((q)->path) >> 32)))
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@ -253,9 +253,12 @@ void v9fs_set_netfs_context(struct inode *inode)
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}
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int v9fs_init_inode(struct v9fs_session_info *v9ses,
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struct inode *inode, umode_t mode, dev_t rdev)
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struct inode *inode, struct p9_qid *qid, umode_t mode, dev_t rdev)
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{
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int err = 0;
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struct v9fs_inode *v9inode = V9FS_I(inode);
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memcpy(&v9inode->qid, qid, sizeof(struct p9_qid));
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inode_init_owner(&nop_mnt_idmap, inode, NULL, mode);
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inode->i_blocks = 0;
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@ -354,80 +357,40 @@ void v9fs_evict_inode(struct inode *inode)
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#endif
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}
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static int v9fs_test_inode(struct inode *inode, void *data)
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{
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int umode;
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dev_t rdev;
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct p9_wstat *st = (struct p9_wstat *)data;
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struct v9fs_session_info *v9ses = v9fs_inode2v9ses(inode);
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umode = p9mode2unixmode(v9ses, st, &rdev);
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/* don't match inode of different type */
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if (inode_wrong_type(inode, umode))
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return 0;
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/* compare qid details */
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if (memcmp(&v9inode->qid.version,
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&st->qid.version, sizeof(v9inode->qid.version)))
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return 0;
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if (v9inode->qid.type != st->qid.type)
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return 0;
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if (v9inode->qid.path != st->qid.path)
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return 0;
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return 1;
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}
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static int v9fs_test_new_inode(struct inode *inode, void *data)
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{
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return 0;
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}
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static int v9fs_set_inode(struct inode *inode, void *data)
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{
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct p9_wstat *st = (struct p9_wstat *)data;
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memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
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return 0;
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}
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static struct inode *v9fs_qid_iget(struct super_block *sb,
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struct p9_qid *qid,
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struct p9_wstat *st,
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int new)
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struct inode *v9fs_fid_iget(struct super_block *sb, struct p9_fid *fid)
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{
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dev_t rdev;
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int retval;
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umode_t umode;
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struct inode *inode;
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struct p9_wstat *st;
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struct v9fs_session_info *v9ses = sb->s_fs_info;
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int (*test)(struct inode *inode, void *data);
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if (new)
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test = v9fs_test_new_inode;
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else
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test = v9fs_test_inode;
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inode = iget5_locked(sb, QID2INO(qid), test, v9fs_set_inode, st);
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if (!inode)
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inode = iget_locked(sb, QID2INO(&fid->qid));
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if (unlikely(!inode))
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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/*
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* initialize the inode with the stat info
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* FIXME!! we may need support for stale inodes
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* later.
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*/
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inode->i_ino = QID2INO(qid);
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st = p9_client_stat(fid);
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if (IS_ERR(st)) {
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retval = PTR_ERR(st);
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goto error;
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}
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umode = p9mode2unixmode(v9ses, st, &rdev);
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retval = v9fs_init_inode(v9ses, inode, umode, rdev);
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retval = v9fs_init_inode(v9ses, inode, &fid->qid, umode, rdev);
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v9fs_stat2inode(st, inode, sb, 0);
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p9stat_free(st);
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kfree(st);
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if (retval)
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goto error;
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v9fs_stat2inode(st, inode, sb, 0);
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v9fs_set_netfs_context(inode);
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v9fs_cache_inode_get_cookie(inode);
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unlock_new_inode(inode);
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@ -438,23 +401,6 @@ static struct inode *v9fs_qid_iget(struct super_block *sb,
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}
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struct inode *
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v9fs_inode_from_fid(struct v9fs_session_info *v9ses, struct p9_fid *fid,
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struct super_block *sb, int new)
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{
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struct p9_wstat *st;
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struct inode *inode = NULL;
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st = p9_client_stat(fid);
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if (IS_ERR(st))
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return ERR_CAST(st);
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inode = v9fs_qid_iget(sb, &st->qid, st, new);
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p9stat_free(st);
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kfree(st);
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return inode;
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}
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/**
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* v9fs_at_to_dotl_flags- convert Linux specific AT flags to
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* plan 9 AT flag.
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@ -601,7 +547,7 @@ v9fs_create(struct v9fs_session_info *v9ses, struct inode *dir,
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/*
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* instantiate inode and assign the unopened fid to the dentry
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*/
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inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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p9_debug(P9_DEBUG_VFS,
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@ -729,10 +675,8 @@ struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
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inode = NULL;
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else if (IS_ERR(fid))
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inode = ERR_CAST(fid);
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else if (v9ses->cache & (CACHE_META|CACHE_LOOSE))
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inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
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else
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inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
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/*
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* If we had a rename on the server and a parallel lookup
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* for the new name, then make sure we instantiate with
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@ -52,76 +52,33 @@ static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
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return current_fsgid();
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}
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static int v9fs_test_inode_dotl(struct inode *inode, void *data)
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{
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
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/* don't match inode of different type */
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if (inode_wrong_type(inode, st->st_mode))
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return 0;
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if (inode->i_generation != st->st_gen)
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return 0;
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/* compare qid details */
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if (memcmp(&v9inode->qid.version,
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&st->qid.version, sizeof(v9inode->qid.version)))
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return 0;
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if (v9inode->qid.type != st->qid.type)
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return 0;
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if (v9inode->qid.path != st->qid.path)
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return 0;
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return 1;
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}
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/* Always get a new inode */
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static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
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{
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return 0;
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}
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static int v9fs_set_inode_dotl(struct inode *inode, void *data)
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{
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struct v9fs_inode *v9inode = V9FS_I(inode);
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struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
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memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
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inode->i_generation = st->st_gen;
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return 0;
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}
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static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
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struct p9_qid *qid,
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struct p9_fid *fid,
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struct p9_stat_dotl *st,
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int new)
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struct inode *v9fs_fid_iget_dotl(struct super_block *sb, struct p9_fid *fid)
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{
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int retval;
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struct inode *inode;
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struct p9_stat_dotl *st;
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struct v9fs_session_info *v9ses = sb->s_fs_info;
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int (*test)(struct inode *inode, void *data);
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if (new)
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test = v9fs_test_new_inode_dotl;
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else
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test = v9fs_test_inode_dotl;
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inode = iget5_locked(sb, QID2INO(qid), test, v9fs_set_inode_dotl, st);
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if (!inode)
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inode = iget_locked(sb, QID2INO(&fid->qid));
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if (unlikely(!inode))
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return ERR_PTR(-ENOMEM);
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if (!(inode->i_state & I_NEW))
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return inode;
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/*
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* initialize the inode with the stat info
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* FIXME!! we may need support for stale inodes
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* later.
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*/
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inode->i_ino = QID2INO(qid);
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retval = v9fs_init_inode(v9ses, inode,
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st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
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if (IS_ERR(st)) {
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retval = PTR_ERR(st);
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goto error;
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}
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retval = v9fs_init_inode(v9ses, inode, &fid->qid,
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st->st_mode, new_decode_dev(st->st_rdev));
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kfree(st);
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if (retval)
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goto error;
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@ -133,6 +90,7 @@ static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
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goto error;
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unlock_new_inode(inode);
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return inode;
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error:
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iget_failed(inode);
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@ -140,22 +98,6 @@ static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
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}
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struct inode *
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v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
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struct super_block *sb, int new)
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{
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struct p9_stat_dotl *st;
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struct inode *inode = NULL;
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st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
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if (IS_ERR(st))
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return ERR_CAST(st);
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inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
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kfree(st);
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return inode;
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}
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struct dotl_openflag_map {
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int open_flag;
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int dotl_flag;
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@ -305,7 +247,7 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
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p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
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goto out;
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}
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inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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inode = v9fs_fid_iget_dotl(dir->i_sb, fid);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
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@ -400,7 +342,7 @@ static int v9fs_vfs_mkdir_dotl(struct mnt_idmap *idmap,
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}
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/* instantiate inode and assign the unopened fid to the dentry */
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inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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inode = v9fs_fid_iget_dotl(dir->i_sb, fid);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
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@ -838,7 +780,7 @@ v9fs_vfs_mknod_dotl(struct mnt_idmap *idmap, struct inode *dir,
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err);
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goto error;
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}
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inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
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inode = v9fs_fid_iget_dotl(dir->i_sb, fid);
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if (IS_ERR(inode)) {
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err = PTR_ERR(inode);
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p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
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@ -139,7 +139,7 @@ static struct dentry *v9fs_mount(struct file_system_type *fs_type, int flags,
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else
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sb->s_d_op = &v9fs_dentry_operations;
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inode = v9fs_get_new_inode_from_fid(v9ses, fid, sb);
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inode = v9fs_get_inode_from_fid(v9ses, fid, sb);
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if (IS_ERR(inode)) {
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retval = PTR_ERR(inode);
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goto release_sb;
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