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fs/9p/fid.c
6.78 KB
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/* * V9FS FID Management * |
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* Copyright (C) 2007 by Latchesar Ionkov <lucho@ionkov.net> |
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* Copyright (C) 2005, 2006 by Eric Van Hensbergen <ericvh@gmail.com> |
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* * This program is free software; you can redistribute it and/or modify |
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* it under the terms of the GNU General Public License version 2 * as published by the Free Software Foundation. |
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* * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to: * Free Software Foundation * 51 Franklin Street, Fifth Floor * Boston, MA 02111-1301 USA * */ |
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#include <linux/module.h> #include <linux/errno.h> #include <linux/fs.h> |
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#include <linux/slab.h> |
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#include <linux/sched.h> |
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#include <linux/idr.h> |
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#include <net/9p/9p.h> #include <net/9p/client.h> |
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#include "v9fs.h" |
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#include "v9fs_vfs.h" |
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#include "fid.h" /** |
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* v9fs_fid_add - add a fid to a dentry * @dentry: dentry that the fid is being added to |
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* @fid: fid to add |
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* */ |
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static inline void __add_fid(struct dentry *dentry, struct p9_fid *fid) |
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{ |
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hlist_add_head(&fid->dlist, (struct hlist_head *)&dentry->d_fsdata); } |
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void v9fs_fid_add(struct dentry *dentry, struct p9_fid *fid) |
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{ |
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spin_lock(&dentry->d_lock); |
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__add_fid(dentry, fid); |
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spin_unlock(&dentry->d_lock); |
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} /** |
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* v9fs_fid_find - retrieve a fid that belongs to the specified uid |
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* @dentry: dentry to look for fid in |
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* @uid: return fid that belongs to the specified user * @any: if non-zero, return any fid associated with the dentry |
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* */ |
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static struct p9_fid *v9fs_fid_find(struct dentry *dentry, kuid_t uid, int any) |
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{ |
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struct p9_fid *fid, *ret; |
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p9_debug(P9_DEBUG_VFS, " dentry: %pd (%p) uid %d any %d ", dentry, dentry, from_kuid(&init_user_ns, uid), |
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any); |
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ret = NULL; |
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/* we'll recheck under lock if there's anything to look in */ if (dentry->d_fsdata) { struct hlist_head *h = (struct hlist_head *)&dentry->d_fsdata; |
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spin_lock(&dentry->d_lock); |
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hlist_for_each_entry(fid, h, dlist) { |
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if (any || uid_eq(fid->uid, uid)) { |
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ret = fid; break; } } |
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spin_unlock(&dentry->d_lock); |
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} |
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return ret; |
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} |
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/* * We need to hold v9ses->rename_sem as long as we hold references * to returned path array. Array element contain pointers to * dentry names. */ static int build_path_from_dentry(struct v9fs_session_info *v9ses, struct dentry *dentry, char ***names) { int n = 0, i; char **wnames; struct dentry *ds; for (ds = dentry; !IS_ROOT(ds); ds = ds->d_parent) n++; wnames = kmalloc(sizeof(char *) * n, GFP_KERNEL); if (!wnames) goto err_out; for (ds = dentry, i = (n-1); i >= 0; i--, ds = ds->d_parent) wnames[i] = (char *)ds->d_name.name; *names = wnames; return n; err_out: return -ENOMEM; } |
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static struct p9_fid *v9fs_fid_lookup_with_uid(struct dentry *dentry, |
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kuid_t uid, int any) |
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{ |
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struct dentry *ds; |
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char **wnames, *uname; |
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int i, n, l, clone, access; struct v9fs_session_info *v9ses; struct p9_fid *fid, *old_fid = NULL; |
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v9ses = v9fs_dentry2v9ses(dentry); |
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access = v9ses->flags & V9FS_ACCESS_MASK; |
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fid = v9fs_fid_find(dentry, uid, any); if (fid) return fid; |
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/* * we don't have a matching fid. To do a TWALK we need * parent fid. We need to prevent rename when we want to * look at the parent. */ down_read(&v9ses->rename_sem); |
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ds = dentry->d_parent; fid = v9fs_fid_find(ds, uid, any); |
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if (fid) { /* Found the parent fid do a lookup with that */ fid = p9_client_walk(fid, 1, (char **)&dentry->d_name.name, 1); goto fid_out; } up_read(&v9ses->rename_sem); |
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/* start from the root and try to do a lookup */ fid = v9fs_fid_find(dentry->d_sb->s_root, uid, any); if (!fid) { /* the user is not attached to the fs yet */ if (access == V9FS_ACCESS_SINGLE) return ERR_PTR(-EPERM); |
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if (v9fs_proto_dotu(v9ses) || v9fs_proto_dotl(v9ses)) uname = NULL; else uname = v9ses->uname; |
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fid = p9_client_attach(v9ses->clnt, NULL, uname, uid, v9ses->aname); if (IS_ERR(fid)) return fid; |
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v9fs_fid_add(dentry->d_sb->s_root, fid); } /* If we are root ourself just return that */ if (dentry->d_sb->s_root == dentry) |
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return fid; |
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/* * Do a multipath walk with attached root. * When walking parent we need to make sure we * don't have a parallel rename happening */ down_read(&v9ses->rename_sem); n = build_path_from_dentry(v9ses, dentry, &wnames); if (n < 0) { fid = ERR_PTR(n); goto err_out; } |
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clone = 1; i = 0; while (i < n) { l = min(n - i, P9_MAXWELEM); |
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/* * We need to hold rename lock when doing a multipath * walk to ensure none of the patch component change */ |
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fid = p9_client_walk(fid, l, &wnames[i], clone); |
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if (IS_ERR(fid)) { |
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if (old_fid) { /* * If we fail, clunk fid which are mapping * to path component and not the last component * of the path. */ p9_client_clunk(old_fid); } |
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kfree(wnames); |
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goto err_out; |
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} |
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old_fid = fid; |
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i += l; clone = 0; } |
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kfree(wnames); |
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fid_out: |
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if (!IS_ERR(fid)) { spin_lock(&dentry->d_lock); if (d_unhashed(dentry)) { spin_unlock(&dentry->d_lock); p9_client_clunk(fid); fid = ERR_PTR(-ENOENT); } else { __add_fid(dentry, fid); spin_unlock(&dentry->d_lock); } } |
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err_out: up_read(&v9ses->rename_sem); |
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return fid; |
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} |
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/** * v9fs_fid_lookup - lookup for a fid, try to walk if not found * @dentry: dentry to look for fid in * * Look for a fid in the specified dentry for the current user. * If no fid is found, try to create one walking from a fid from the parent * dentry (if it has one), or the root dentry. If the user haven't accessed * the fs yet, attach now and walk from the root. */ struct p9_fid *v9fs_fid_lookup(struct dentry *dentry) { |
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kuid_t uid; |
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int any, access; struct v9fs_session_info *v9ses; |
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v9ses = v9fs_dentry2v9ses(dentry); |
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access = v9ses->flags & V9FS_ACCESS_MASK; switch (access) { case V9FS_ACCESS_SINGLE: case V9FS_ACCESS_USER: case V9FS_ACCESS_CLIENT: uid = current_fsuid(); any = 0; break; case V9FS_ACCESS_ANY: uid = v9ses->uid; any = 1; break; default: |
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uid = INVALID_UID; |
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any = 0; break; } return v9fs_fid_lookup_with_uid(dentry, uid, any); } |
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struct p9_fid *v9fs_writeback_fid(struct dentry *dentry) { |
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int err; |
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struct p9_fid *fid; |
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fid = clone_fid(v9fs_fid_lookup_with_uid(dentry, GLOBAL_ROOT_UID, 0)); |
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if (IS_ERR(fid)) goto error_out; /* * writeback fid will only be used to write back the * dirty pages. We always request for the open fid in read-write * mode so that a partial page write which result in page * read can work. |
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*/ |
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err = p9_client_open(fid, O_RDWR); |
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if (err < 0) { p9_client_clunk(fid); fid = ERR_PTR(err); goto error_out; } error_out: return fid; } |