diff --git a/Documentation/filesystems/afs.txt b/Documentation/filesystems/afs.txt
index ba99b5ac4fd80284adfbc2f6404a7d3da3fbb665..c5254f6d234dbbe011ce022bfbbef1934b07b9de 100644
--- a/Documentation/filesystems/afs.txt
+++ b/Documentation/filesystems/afs.txt
@@ -7,6 +7,7 @@ Contents:
- Overview.
- Usage.
- Mountpoints.
+ - Dynamic root.
- Proc filesystem.
- The cell database.
- Security.
@@ -127,6 +128,22 @@ mounted on /afs in one go by doing:
umount /afs
+============
+DYNAMIC ROOT
+============
+
+A mount option is available to create a serverless mount that is only usable
+for dynamic lookup. Creating such a mount can be done by, for example:
+
+ mount -t afs none /afs -o dyn
+
+This creates a mount that just has an empty directory at the root. Attempting
+to look up a name in this directory will cause a mountpoint to be created that
+looks up a cell of the same name, for example:
+
+ ls /afs/grand.central.org/
+
+
===============
PROC FILESYSTEM
===============
diff --git a/fs/afs/addr_list.c b/fs/afs/addr_list.c
index a537368ba0db9a9df6afb9e800578b4fe966ded6..fd9f28b8a933a9eacff9b17230581ff8bf37f64e 100644
--- a/fs/afs/addr_list.c
+++ b/fs/afs/addr_list.c
@@ -332,11 +332,18 @@ bool afs_iterate_addresses(struct afs_addr_cursor *ac)
*/
int afs_end_cursor(struct afs_addr_cursor *ac)
{
- if (ac->responded && ac->index != ac->start)
- WRITE_ONCE(ac->alist->index, ac->index);
+ struct afs_addr_list *alist;
+
+ alist = ac->alist;
+ if (alist) {
+ if (ac->responded && ac->index != ac->start)
+ WRITE_ONCE(alist->index, ac->index);
+ afs_put_addrlist(alist);
+ }
- afs_put_addrlist(ac->alist);
+ ac->addr = NULL;
ac->alist = NULL;
+ ac->begun = false;
return ac->error;
}
diff --git a/fs/afs/dir.c b/fs/afs/dir.c
index 23c7f395d7182705d945082576ec59a15af3226f..ba2b458b36d15e2e5757046586e72160f51e23cb 100644
--- a/fs/afs/dir.c
+++ b/fs/afs/dir.c
@@ -17,10 +17,13 @@
#include <linux/pagemap.h>
#include <linux/ctype.h>
#include <linux/sched.h>
+#include <linux/dns_resolver.h>
#include "internal.h"
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
unsigned int flags);
+static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry,
+ unsigned int flags);
static int afs_dir_open(struct inode *inode, struct file *file);
static int afs_readdir(struct file *file, struct dir_context *ctx);
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags);
@@ -64,6 +67,17 @@ const struct inode_operations afs_dir_inode_operations = {
.listxattr = afs_listxattr,
};
+const struct file_operations afs_dynroot_file_operations = {
+ .open = dcache_dir_open,
+ .release = dcache_dir_close,
+ .iterate_shared = dcache_readdir,
+ .llseek = dcache_dir_lseek,
+};
+
+const struct inode_operations afs_dynroot_inode_operations = {
+ .lookup = afs_dynroot_lookup,
+};
+
const struct dentry_operations afs_fs_dentry_operations = {
.d_revalidate = afs_d_revalidate,
.d_delete = afs_d_delete,
@@ -467,26 +481,59 @@ static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
return 0;
}
+/*
+ * Probe to see if a cell may exist. This prevents positive dentries from
+ * being created unnecessarily.
+ */
+static int afs_probe_cell_name(struct dentry *dentry)
+{
+ struct afs_cell *cell;
+ const char *name = dentry->d_name.name;
+ size_t len = dentry->d_name.len;
+ int ret;
+
+ /* Names prefixed with a dot are R/W mounts. */
+ if (name[0] == '.') {
+ if (len == 1)
+ return -EINVAL;
+ name++;
+ len--;
+ }
+
+ cell = afs_lookup_cell_rcu(afs_d2net(dentry), name, len);
+ if (!IS_ERR(cell)) {
+ afs_put_cell(afs_d2net(dentry), cell);
+ return 0;
+ }
+
+ ret = dns_query("afsdb", name, len, "ipv4", NULL, NULL);
+ if (ret == -ENODATA)
+ ret = -EDESTADDRREQ;
+ return ret;
+}
+
/*
* Try to auto mount the mountpoint with pseudo directory, if the autocell
* operation is setted.
*/
-static struct inode *afs_try_auto_mntpt(
- int ret, struct dentry *dentry, struct inode *dir, struct key *key,
- struct afs_fid *fid)
+static struct inode *afs_try_auto_mntpt(struct dentry *dentry,
+ struct inode *dir, struct afs_fid *fid)
{
- const char *devname = dentry->d_name.name;
struct afs_vnode *vnode = AFS_FS_I(dir);
struct inode *inode;
+ int ret = -ENOENT;
- _enter("%d, %p{%pd}, {%x:%u}, %p",
- ret, dentry, dentry, vnode->fid.vid, vnode->fid.vnode, key);
+ _enter("%p{%pd}, {%x:%u}",
+ dentry, dentry, vnode->fid.vid, vnode->fid.vnode);
+
+ if (!test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
+ goto out;
- if (ret != -ENOENT ||
- !test_bit(AFS_VNODE_AUTOCELL, &vnode->flags))
+ ret = afs_probe_cell_name(dentry);
+ if (ret < 0)
goto out;
- inode = afs_iget_autocell(dir, devname, strlen(devname), key);
+ inode = afs_iget_pseudo_dir(dir->i_sb, false);
if (IS_ERR(inode)) {
ret = PTR_ERR(inode);
goto out;
@@ -545,13 +592,16 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
ret = afs_do_lookup(dir, dentry, &fid, key);
if (ret < 0) {
- inode = afs_try_auto_mntpt(ret, dentry, dir, key, &fid);
- if (!IS_ERR(inode)) {
- key_put(key);
- goto success;
+ if (ret == -ENOENT) {
+ inode = afs_try_auto_mntpt(dentry, dir, &fid);
+ if (!IS_ERR(inode)) {
+ key_put(key);
+ goto success;
+ }
+
+ ret = PTR_ERR(inode);
}
- ret = PTR_ERR(inode);
key_put(key);
if (ret == -ENOENT) {
d_add(dentry, NULL);
@@ -582,6 +632,46 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
return NULL;
}
+/*
+ * Look up an entry in a dynroot directory.
+ */
+static struct dentry *afs_dynroot_lookup(struct inode *dir, struct dentry *dentry,
+ unsigned int flags)
+{
+ struct afs_vnode *vnode;
+ struct afs_fid fid;
+ struct inode *inode;
+ int ret;
+
+ vnode = AFS_FS_I(dir);
+
+ _enter("%pd", dentry);
+
+ ASSERTCMP(d_inode(dentry), ==, NULL);
+
+ if (dentry->d_name.len >= AFSNAMEMAX) {
+ _leave(" = -ENAMETOOLONG");
+ return ERR_PTR(-ENAMETOOLONG);
+ }
+
+ inode = afs_try_auto_mntpt(dentry, dir, &fid);
+ if (IS_ERR(inode)) {
+ ret = PTR_ERR(inode);
+ if (ret == -ENOENT) {
+ d_add(dentry, NULL);
+ _leave(" = NULL [negative]");
+ return NULL;
+ }
+ _leave(" = %d [do]", ret);
+ return ERR_PTR(ret);
+ }
+
+ d_add(dentry, inode);
+ _leave(" = 0 { ino=%lu v=%u }",
+ d_inode(dentry)->i_ino, d_inode(dentry)->i_generation);
+ return NULL;
+}
+
/*
* check that a dentry lookup hit has found a valid entry
* - NOTE! the hit can be a negative hit too, so we can't assume we have an
@@ -589,6 +679,7 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
*/
static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
{
+ struct afs_super_info *as = dentry->d_sb->s_fs_info;
struct afs_vnode *vnode, *dir;
struct afs_fid uninitialized_var(fid);
struct dentry *parent;
@@ -600,6 +691,9 @@ static int afs_d_revalidate(struct dentry *dentry, unsigned int flags)
if (flags & LOOKUP_RCU)
return -ECHILD;
+ if (as->dyn_root)
+ return 1;
+
if (d_really_is_positive(dentry)) {
vnode = AFS_FS_I(d_inode(dentry));
_enter("{v={%x:%u} n=%pd fl=%lx},",
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index c7f17c44c7ce88243b4df6016ad2865e2df1c594..6b39d0255b72197c4720b303fe250c2b8f98ea69 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c
@@ -147,7 +147,7 @@ int afs_iget5_test(struct inode *inode, void *opaque)
*
* These pseudo inodes don't match anything.
*/
-static int afs_iget5_autocell_test(struct inode *inode, void *opaque)
+static int afs_iget5_pseudo_dir_test(struct inode *inode, void *opaque)
{
return 0;
}
@@ -169,31 +169,34 @@ static int afs_iget5_set(struct inode *inode, void *opaque)
}
/*
- * inode retrieval for autocell
+ * Create an inode for a dynamic root directory or an autocell dynamic
+ * automount dir.
*/
-struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
- int namesz, struct key *key)
+struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root)
{
struct afs_iget_data data;
struct afs_super_info *as;
struct afs_vnode *vnode;
- struct super_block *sb;
struct inode *inode;
static atomic_t afs_autocell_ino;
- _enter("{%x:%u},%*.*s,",
- AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode,
- namesz, namesz, dev_name ?: "");
+ _enter("");
- sb = dir->i_sb;
as = sb->s_fs_info;
- data.volume = as->volume;
- data.fid.vid = as->volume->vid;
- data.fid.unique = 0;
- data.fid.vnode = 0;
+ if (as->volume) {
+ data.volume = as->volume;
+ data.fid.vid = as->volume->vid;
+ }
+ if (root) {
+ data.fid.vnode = 1;
+ data.fid.unique = 1;
+ } else {
+ data.fid.vnode = atomic_inc_return(&afs_autocell_ino);
+ data.fid.unique = 0;
+ }
- inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino),
- afs_iget5_autocell_test, afs_iget5_set,
+ inode = iget5_locked(sb, data.fid.vnode,
+ afs_iget5_pseudo_dir_test, afs_iget5_set,
&data);
if (!inode) {
_leave(" = -ENOMEM");
@@ -211,7 +214,12 @@ struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
inode->i_size = 0;
inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
- inode->i_op = &afs_autocell_inode_operations;
+ if (root) {
+ inode->i_op = &afs_dynroot_inode_operations;
+ inode->i_fop = &afs_dynroot_file_operations;
+ } else {
+ inode->i_op = &afs_autocell_inode_operations;
+ }
set_nlink(inode, 2);
inode->i_uid = GLOBAL_ROOT_UID;
inode->i_gid = GLOBAL_ROOT_GID;
@@ -223,8 +231,12 @@ struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name,
inode->i_generation = 0;
set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags);
- set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
- inode->i_flags |= S_AUTOMOUNT | S_NOATIME;
+ if (!root) {
+ set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
+ inode->i_flags |= S_AUTOMOUNT;
+ }
+
+ inode->i_flags |= S_NOATIME;
unlock_new_inode(inode);
_leave(" = %p", inode);
return inode;
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index 804d1f905622075ab27feecf7f2c959be9c1ac01..f38d6a561a84825a716a9240571d8797f7cda81c 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -36,6 +36,7 @@ struct afs_mount_params {
bool rwpath; /* T if the parent should be considered R/W */
bool force; /* T to force cell type */
bool autocell; /* T if set auto mount operation */
+ bool dyn_root; /* T if dynamic root */
afs_voltype_t type; /* type of volume requested */
int volnamesz; /* size of volume name */
const char *volname; /* name of volume to mount */
@@ -186,6 +187,7 @@ struct afs_super_info {
struct afs_net *net; /* Network namespace */
struct afs_cell *cell; /* The cell in which the volume resides */
struct afs_volume *volume; /* volume record */
+ bool dyn_root; /* True if dynamic root */
};
static inline struct afs_super_info *AFS_FS_S(struct super_block *sb)
@@ -634,10 +636,13 @@ extern bool afs_cm_incoming_call(struct afs_call *);
/*
* dir.c
*/
-extern bool afs_dir_check_page(struct inode *, struct page *);
+extern const struct file_operations afs_dir_file_operations;
extern const struct inode_operations afs_dir_inode_operations;
+extern const struct file_operations afs_dynroot_file_operations;
+extern const struct inode_operations afs_dynroot_inode_operations;
extern const struct dentry_operations afs_fs_dentry_operations;
-extern const struct file_operations afs_dir_file_operations;
+
+extern bool afs_dir_check_page(struct inode *, struct page *);
/*
* file.c
@@ -695,8 +700,7 @@ extern int afs_fs_get_capabilities(struct afs_net *, struct afs_server *,
*/
extern int afs_fetch_status(struct afs_vnode *, struct key *);
extern int afs_iget5_test(struct inode *, void *);
-extern struct inode *afs_iget_autocell(struct inode *, const char *, int,
- struct key *);
+extern struct inode *afs_iget_pseudo_dir(struct super_block *, bool);
extern struct inode *afs_iget(struct super_block *, struct key *,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *,
diff --git a/fs/afs/mntpt.c b/fs/afs/mntpt.c
index 690fea9d84c33a6196a14f75b710edd21b7effbf..99fd13500a97f9e77e2cbf603ae012bc460d1a2f 100644
--- a/fs/afs/mntpt.c
+++ b/fs/afs/mntpt.c
@@ -72,7 +72,7 @@ static int afs_mntpt_open(struct inode *inode, struct file *file)
*/
static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
{
- struct afs_super_info *super;
+ struct afs_super_info *as;
struct vfsmount *mnt;
struct afs_vnode *vnode;
struct page *page;
@@ -104,13 +104,13 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
goto error_no_page;
if (mntpt->d_name.name[0] == '.') {
- devname[0] = '#';
- memcpy(devname + 1, mntpt->d_name.name, size - 1);
+ devname[0] = '%';
+ memcpy(devname + 1, mntpt->d_name.name + 1, size - 1);
memcpy(devname + size, afs_root_cell,
sizeof(afs_root_cell));
rwpath = true;
} else {
- devname[0] = '%';
+ devname[0] = '#';
memcpy(devname + 1, mntpt->d_name.name, size);
memcpy(devname + size + 1, afs_root_cell,
sizeof(afs_root_cell));
@@ -142,11 +142,13 @@ static struct vfsmount *afs_mntpt_do_automount(struct dentry *mntpt)
}
/* work out what options we want */
- super = AFS_FS_S(mntpt->d_sb);
- memcpy(options, "cell=", 5);
- strcpy(options + 5, super->volume->cell->name);
- if (super->volume->type == AFSVL_RWVOL || rwpath)
- strcat(options, ",rwpath");
+ as = AFS_FS_S(mntpt->d_sb);
+ if (as->cell) {
+ memcpy(options, "cell=", 5);
+ strcpy(options + 5, as->cell->name);
+ if ((as->volume && as->volume->type == AFSVL_RWVOL) || rwpath)
+ strcat(options, ",rwpath");
+ }
/* try and do the mount */
_debug("--- attempting mount %s -o %s ---", devname, options);
diff --git a/fs/afs/rotate.c b/fs/afs/rotate.c
index d04511fb3879748cf7e6e98c5c53a807f90007ba..ad1328d855261a7ac90cc1374da9c916e381d718 100644
--- a/fs/afs/rotate.c
+++ b/fs/afs/rotate.c
@@ -330,26 +330,6 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
if (!afs_start_fs_iteration(fc, vnode))
goto failed;
- goto use_server;
-
-next_server:
- _debug("next");
- afs_put_cb_interest(afs_v2net(vnode), fc->cbi);
- fc->cbi = NULL;
- fc->index++;
- if (fc->index >= fc->server_list->nr_servers)
- fc->index = 0;
- if (fc->index != fc->start)
- goto use_server;
-
- /* That's all the servers poked to no good effect. Try again if some
- * of them were busy.
- */
- if (fc->flags & AFS_FS_CURSOR_VBUSY)
- goto restart_from_beginning;
-
- fc->ac.error = -EDESTADDRREQ;
- goto failed;
use_server:
_debug("use");
@@ -383,6 +363,7 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
afs_get_addrlist(alist);
read_unlock(&server->fs_lock);
+ memset(&fc->ac, 0, sizeof(fc->ac));
/* Probe the current fileserver if we haven't done so yet. */
if (!test_bit(AFS_SERVER_FL_PROBED, &server->flags)) {
@@ -397,12 +378,8 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
else
afs_put_addrlist(alist);
- fc->ac.addr = NULL;
fc->ac.start = READ_ONCE(alist->index);
fc->ac.index = fc->ac.start;
- fc->ac.error = 0;
- fc->ac.begun = false;
- goto iterate_address;
iterate_address:
ASSERT(fc->ac.alist);
@@ -410,16 +387,35 @@ bool afs_select_fileserver(struct afs_fs_cursor *fc)
/* Iterate over the current server's address list to try and find an
* address on which it will respond to us.
*/
- if (afs_iterate_addresses(&fc->ac)) {
- _leave(" = t");
- return true;
- }
+ if (!afs_iterate_addresses(&fc->ac))
+ goto next_server;
+
+ _leave(" = t");
+ return true;
+next_server:
+ _debug("next");
afs_end_cursor(&fc->ac);
- goto next_server;
+ afs_put_cb_interest(afs_v2net(vnode), fc->cbi);
+ fc->cbi = NULL;
+ fc->index++;
+ if (fc->index >= fc->server_list->nr_servers)
+ fc->index = 0;
+ if (fc->index != fc->start)
+ goto use_server;
+
+ /* That's all the servers poked to no good effect. Try again if some
+ * of them were busy.
+ */
+ if (fc->flags & AFS_FS_CURSOR_VBUSY)
+ goto restart_from_beginning;
+
+ fc->ac.error = -EDESTADDRREQ;
+ goto failed;
failed:
fc->flags |= AFS_FS_CURSOR_STOP;
+ afs_end_cursor(&fc->ac);
_leave(" = f [failed %d]", fc->ac.error);
return false;
}
@@ -458,12 +454,10 @@ bool afs_select_current_fileserver(struct afs_fs_cursor *fc)
return false;
}
+ memset(&fc->ac, 0, sizeof(fc->ac));
fc->ac.alist = alist;
- fc->ac.addr = NULL;
fc->ac.start = READ_ONCE(alist->index);
fc->ac.index = fc->ac.start;
- fc->ac.error = 0;
- fc->ac.begun = false;
goto iterate_address;
case 0:
@@ -520,238 +514,3 @@ int afs_end_vnode_operation(struct afs_fs_cursor *fc)
return fc->ac.error;
}
-
-#if 0
-/*
- * Set a filesystem server cursor for using a specific FS server.
- */
-int afs_set_fs_cursor(struct afs_fs_cursor *fc, struct afs_vnode *vnode)
-{
- afs_init_fs_cursor(fc, vnode);
-
- read_seqlock_excl(&vnode->cb_lock);
- if (vnode->cb_interest) {
- if (vnode->cb_interest->server->fs_state == 0)
- fc->server = afs_get_server(vnode->cb_interest->server);
- else
- fc->ac.error = vnode->cb_interest->server->fs_state;
- } else {
- fc->ac.error = -ESTALE;
- }
- read_sequnlock_excl(&vnode->cb_lock);
-
- return fc->ac.error;
-}
-
-/*
- * pick a server to use to try accessing this volume
- * - returns with an elevated usage count on the server chosen
- */
-bool afs_volume_pick_fileserver(struct afs_fs_cursor *fc, struct afs_vnode *vnode)
-{
- struct afs_volume *volume = vnode->volume;
- struct afs_server *server;
- int ret, state, loop;
-
- _enter("%s", volume->vlocation->vldb.name);
-
- /* stick with the server we're already using if we can */
- if (vnode->cb_interest && vnode->cb_interest->server->fs_state == 0) {
- fc->server = afs_get_server(vnode->cb_interest->server);
- goto set_server;
- }
-
- down_read(&volume->server_sem);
-
- /* handle the no-server case */
- if (volume->nservers == 0) {
- fc->ac.error = volume->rjservers ? -ENOMEDIUM : -ESTALE;
- up_read(&volume->server_sem);
- _leave(" = f [no servers %d]", fc->ac.error);
- return false;
- }
-
- /* basically, just search the list for the first live server and use
- * that */
- ret = 0;
- for (loop = 0; loop < volume->nservers; loop++) {
- server = volume->servers[loop];
- state = server->fs_state;
-
- _debug("consider %d [%d]", loop, state);
-
- switch (state) {
- case 0:
- goto picked_server;
-
- case -ENETUNREACH:
- if (ret == 0)
- ret = state;
- break;
-
- case -EHOSTUNREACH:
- if (ret == 0 ||
- ret == -ENETUNREACH)
- ret = state;
- break;
-
- case -ECONNREFUSED:
- if (ret == 0 ||
- ret == -ENETUNREACH ||
- ret == -EHOSTUNREACH)
- ret = state;
- break;
-
- default:
- case -EREMOTEIO:
- if (ret == 0 ||
- ret == -ENETUNREACH ||
- ret == -EHOSTUNREACH ||
- ret == -ECONNREFUSED)
- ret = state;
- break;
- }
- }
-
-error:
- fc->ac.error = ret;
-
- /* no available servers
- * - TODO: handle the no active servers case better
- */
- up_read(&volume->server_sem);
- _leave(" = f [%d]", fc->ac.error);
- return false;
-
-picked_server:
- /* Found an apparently healthy server. We need to register an interest
- * in receiving callbacks before we talk to it.
- */
- ret = afs_register_server_cb_interest(vnode,
- &volume->cb_interests[loop], server);
- if (ret < 0)
- goto error;
-
- fc->server = afs_get_server(server);
- up_read(&volume->server_sem);
-set_server:
- fc->ac.alist = afs_get_addrlist(fc->server->addrs);
- fc->ac.addr = &fc->ac.alist->addrs[0];
- _debug("USING SERVER: %pIS\n", &fc->ac.addr->transport);
- _leave(" = t (picked %pIS)", &fc->ac.addr->transport);
- return true;
-}
-
-/*
- * release a server after use
- * - releases the ref on the server struct that was acquired by picking
- * - records result of using a particular server to access a volume
- * - return true to try again, false if okay or to issue error
- * - the caller must release the server struct if result was false
- */
-bool afs_iterate_fs_cursor(struct afs_fs_cursor *fc,
- struct afs_vnode *vnode)
-{
- struct afs_volume *volume = vnode->volume;
- struct afs_server *server = fc->server;
- unsigned loop;
-
- _enter("%s,%pIS,%d",
- volume->vlocation->vldb.name, &fc->ac.addr->transport,
- fc->ac.error);
-
- switch (fc->ac.error) {
- /* success */
- case 0:
- server->fs_state = 0;
- _leave(" = f");
- return false;
-
- /* the fileserver denied all knowledge of the volume */
- case -ENOMEDIUM:
- down_write(&volume->server_sem);
-
- /* firstly, find where the server is in the active list (if it
- * is) */
- for (loop = 0; loop < volume->nservers; loop++)
- if (volume->servers[loop] == server)
- goto present;
-
- /* no longer there - may have been discarded by another op */
- goto try_next_server_upw;
-
- present:
- volume->nservers--;
- memmove(&volume->servers[loop],
- &volume->servers[loop + 1],
- sizeof(volume->servers[loop]) *
- (volume->nservers - loop));
- volume->servers[volume->nservers] = NULL;
- afs_put_server(afs_v2net(vnode), server);
- volume->rjservers++;
-
- if (volume->nservers > 0)
- /* another server might acknowledge its existence */
- goto try_next_server_upw;
-
- /* handle the case where all the fileservers have rejected the
- * volume
- * - TODO: try asking the fileservers for volume information
- * - TODO: contact the VL server again to see if the volume is
- * no longer registered
- */
- up_write(&volume->server_sem);
- afs_put_server(afs_v2net(vnode), server);
- fc->server = NULL;
- _leave(" = f [completely rejected]");
- return false;
-
- /* problem reaching the server */
- case -ENETUNREACH:
- case -EHOSTUNREACH:
- case -ECONNREFUSED:
- case -ETIME:
- case -ETIMEDOUT:
- case -EREMOTEIO:
- /* mark the server as dead
- * TODO: vary dead timeout depending on error
- */
- spin_lock(&server->fs_lock);
- if (!server->fs_state) {
- server->fs_state = fc->ac.error;
- printk("kAFS: SERVER DEAD state=%d\n", fc->ac.error);
- }
- spin_unlock(&server->fs_lock);
- goto try_next_server;
-
- /* miscellaneous error */
- default:
- case -ENOMEM:
- case -ENONET:
- /* tell the caller to accept the result */
- afs_put_server(afs_v2net(vnode), server);
- fc->server = NULL;
- _leave(" = f [local failure]");
- return false;
- }
-
- /* tell the caller to loop around and try the next server */
-try_next_server_upw:
- up_write(&volume->server_sem);
-try_next_server:
- afs_put_server(afs_v2net(vnode), server);
- _leave(" = t [try next server]");
- return true;
-}
-
-/*
- * Clean up a fileserver cursor.
- */
-int afs_end_fs_cursor(struct afs_fs_cursor *fc, struct afs_net *net)
-{
- afs_end_cursor(&fc->ac);
- afs_put_server(net, fc->server);
- return fc->ac.error;
-}
-
-#endif
diff --git a/fs/afs/server_list.c b/fs/afs/server_list.c
index 0ab3f84578390e1edebb13c7748ef0c9dc9369c5..0f8dc4c8f07c43b3efb0f899b8a40b8f1a697e6c 100644
--- a/fs/afs/server_list.c
+++ b/fs/afs/server_list.c
@@ -58,7 +58,8 @@ struct afs_server_list *afs_alloc_server_list(struct afs_cell *cell,
server = afs_lookup_server(cell, key, &vldb->fs_server[i]);
if (IS_ERR(server)) {
ret = PTR_ERR(server);
- if (ret == -ENOENT)
+ if (ret == -ENOENT ||
+ ret == -ENOMEDIUM)
continue;
goto error_2;
}
diff --git a/fs/afs/super.c b/fs/afs/super.c
index 1037dd41a62210a3568c5a5144ffdc97273c20c3..3623c952b6ffcba21e00f60d568d283307dcfa57 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -64,6 +64,7 @@ static atomic_t afs_count_active_inodes;
enum {
afs_no_opt,
afs_opt_cell,
+ afs_opt_dyn,
afs_opt_rwpath,
afs_opt_vol,
afs_opt_autocell,
@@ -71,6 +72,7 @@ enum {
static const match_table_t afs_options_list = {
{ afs_opt_cell, "cell=%s" },
+ { afs_opt_dyn, "dyn" },
{ afs_opt_rwpath, "rwpath" },
{ afs_opt_vol, "vol=%s" },
{ afs_opt_autocell, "autocell" },
@@ -148,6 +150,11 @@ static int afs_show_devname(struct seq_file *m, struct dentry *root)
const char *suf = "";
char pref = '%';
+ if (as->dyn_root) {
+ seq_puts(m, "none");
+ return 0;
+ }
+
switch (volume->type) {
case AFSVL_RWVOL:
break;
@@ -171,8 +178,12 @@ static int afs_show_devname(struct seq_file *m, struct dentry *root)
*/
static int afs_show_options(struct seq_file *m, struct dentry *root)
{
+ struct afs_super_info *as = AFS_FS_S(root->d_sb);
+
+ if (as->dyn_root)
+ seq_puts(m, ",dyn");
if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
- seq_puts(m, "autocell");
+ seq_puts(m, ",autocell");
return 0;
}
@@ -212,7 +223,7 @@ static int afs_parse_options(struct afs_mount_params *params,
break;
case afs_opt_rwpath:
- params->rwpath = 1;
+ params->rwpath = true;
break;
case afs_opt_vol:
@@ -220,7 +231,11 @@ static int afs_parse_options(struct afs_mount_params *params,
break;
case afs_opt_autocell:
- params->autocell = 1;
+ params->autocell = true;
+ break;
+
+ case afs_opt_dyn:
+ params->dyn_root = true;
break;
default:
@@ -254,7 +269,7 @@ static int afs_parse_device_name(struct afs_mount_params *params,
int cellnamesz;
_enter(",%s", name);
-
+
if (!name) {
printk(KERN_ERR "kAFS: no volume name specified\n");
return -EINVAL;
@@ -336,7 +351,14 @@ static int afs_test_super(struct super_block *sb, void *data)
struct afs_super_info *as1 = data;
struct afs_super_info *as = AFS_FS_S(sb);
- return as->net == as1->net && as->volume->vid == as1->volume->vid;
+ return (as->net == as1->net &&
+ as->volume &&
+ as->volume->vid == as1->volume->vid);
+}
+
+static int afs_dynroot_test_super(struct super_block *sb, void *data)
+{
+ return false;
}
static int afs_set_super(struct super_block *sb, void *data)
@@ -365,24 +387,30 @@ static int afs_fill_super(struct super_block *sb,
sb->s_blocksize_bits = PAGE_SHIFT;
sb->s_magic = AFS_FS_MAGIC;
sb->s_op = &afs_super_ops;
- sb->s_xattr = afs_xattr_handlers;
+ if (!as->dyn_root)
+ sb->s_xattr = afs_xattr_handlers;
ret = super_setup_bdi(sb);
if (ret)
return ret;
sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
- sprintf(sb->s_id, "%u", as->volume->vid);
-
- afs_activate_volume(as->volume);
/* allocate the root inode and dentry */
- fid.vid = as->volume->vid;
- fid.vnode = 1;
- fid.unique = 1;
- inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
+ if (as->dyn_root) {
+ inode = afs_iget_pseudo_dir(sb, true);
+ sb->s_flags |= SB_RDONLY;
+ } else {
+ sprintf(sb->s_id, "%u", as->volume->vid);
+ afs_activate_volume(as->volume);
+ fid.vid = as->volume->vid;
+ fid.vnode = 1;
+ fid.unique = 1;
+ inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
+ }
+
if (IS_ERR(inode))
return PTR_ERR(inode);
- if (params->autocell)
+ if (params->autocell || params->dyn_root)
set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
ret = -ENOMEM;
@@ -407,7 +435,10 @@ static struct afs_super_info *afs_alloc_sbi(struct afs_mount_params *params)
as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
if (as) {
as->net = afs_get_net(params->net);
- as->cell = afs_get_cell(params->cell);
+ if (params->dyn_root)
+ as->dyn_root = true;
+ else
+ as->cell = afs_get_cell(params->cell);
}
return as;
}
@@ -451,18 +482,20 @@ static struct dentry *afs_mount(struct file_system_type *fs_type,
goto error;
}
- ret = afs_parse_device_name(¶ms, dev_name);
- if (ret < 0)
- goto error;
+ if (!params.dyn_root) {
+ ret = afs_parse_device_name(¶ms, dev_name);
+ if (ret < 0)
+ goto error;
- /* try and do the mount securely */
- key = afs_request_key(params.cell);
- if (IS_ERR(key)) {
- _leave(" = %ld [key]", PTR_ERR(key));
- ret = PTR_ERR(key);
- goto error;
+ /* try and do the mount securely */
+ key = afs_request_key(params.cell);
+ if (IS_ERR(key)) {
+ _leave(" = %ld [key]", PTR_ERR(key));
+ ret = PTR_ERR(key);
+ goto error;
+ }
+ params.key = key;
}
- params.key = key;
/* allocate a superblock info record */
ret = -ENOMEM;
@@ -470,20 +503,25 @@ static struct dentry *afs_mount(struct file_system_type *fs_type,
if (!as)
goto error_key;
- /* Assume we're going to need a volume record; at the very least we can
- * use it to update the volume record if we have one already. This
- * checks that the volume exists within the cell.
- */
- candidate = afs_create_volume(¶ms);
- if (IS_ERR(candidate)) {
- ret = PTR_ERR(candidate);
- goto error_as;
- }
+ if (!params.dyn_root) {
+ /* Assume we're going to need a volume record; at the very
+ * least we can use it to update the volume record if we have
+ * one already. This checks that the volume exists within the
+ * cell.
+ */
+ candidate = afs_create_volume(¶ms);
+ if (IS_ERR(candidate)) {
+ ret = PTR_ERR(candidate);
+ goto error_as;
+ }
- as->volume = candidate;
+ as->volume = candidate;
+ }
/* allocate a deviceless superblock */
- sb = sget(fs_type, afs_test_super, afs_set_super, flags, as);
+ sb = sget(fs_type,
+ as->dyn_root ? afs_dynroot_test_super : afs_test_super,
+ afs_set_super, flags, as);
if (IS_ERR(sb)) {
ret = PTR_ERR(sb);
goto error_as;
@@ -529,9 +567,11 @@ static void afs_kill_super(struct super_block *sb)
/* Clear the callback interests (which will do ilookup5) before
* deactivating the superblock.
*/
- afs_clear_callback_interests(as->net, as->volume->servers);
+ if (as->volume)
+ afs_clear_callback_interests(as->net, as->volume->servers);
kill_anon_super(sb);
- afs_deactivate_volume(as->volume);
+ if (as->volume)
+ afs_deactivate_volume(as->volume);
afs_destroy_sbi(as);
}
@@ -619,12 +659,24 @@ static void afs_destroy_inode(struct inode *inode)
*/
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
{
+ struct afs_super_info *as = AFS_FS_S(dentry->d_sb);
struct afs_fs_cursor fc;
struct afs_volume_status vs;
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
struct key *key;
int ret;
+ buf->f_type = dentry->d_sb->s_magic;
+ buf->f_bsize = AFS_BLOCK_SIZE;
+ buf->f_namelen = AFSNAMEMAX - 1;
+
+ if (as->dyn_root) {
+ buf->f_blocks = 1;
+ buf->f_bavail = 0;
+ buf->f_bfree = 0;
+ return 0;
+ }
+
key = afs_request_key(vnode->volume->cell);
if (IS_ERR(key))
return PTR_ERR(key);
@@ -645,10 +697,6 @@ static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
key_put(key);
if (ret == 0) {
- buf->f_type = dentry->d_sb->s_magic;
- buf->f_bsize = AFS_BLOCK_SIZE;
- buf->f_namelen = AFSNAMEMAX - 1;
-
if (vs.max_quota == 0)
buf->f_blocks = vs.part_max_blocks;
else
diff --git a/fs/afs/vlclient.c b/fs/afs/vlclient.c
index e372f89fd36a23867e73af30d6c0a8e85a728f19..5d8562f1ad4ad6da6028c6a6bb055ba4d664cb37 100644
--- a/fs/afs/vlclient.c
+++ b/fs/afs/vlclient.c
@@ -23,7 +23,7 @@ static int afs_deliver_vl_get_entry_by_name_u(struct afs_call *call)
struct afs_uvldbentry__xdr *uvldb;
struct afs_vldb_entry *entry;
bool new_only = false;
- u32 tmp;
+ u32 tmp, nr_servers;
int i, ret;
_enter("");
@@ -36,6 +36,10 @@ static int afs_deliver_vl_get_entry_by_name_u(struct afs_call *call)
uvldb = call->buffer;
entry = call->reply[0];
+ nr_servers = ntohl(uvldb->nServers);
+ if (nr_servers > AFS_NMAXNSERVERS)
+ nr_servers = AFS_NMAXNSERVERS;
+
for (i = 0; i < ARRAY_SIZE(uvldb->name) - 1; i++)
entry->name[i] = (u8)ntohl(uvldb->name[i]);
entry->name[i] = 0;
@@ -44,14 +48,14 @@ static int afs_deliver_vl_get_entry_by_name_u(struct afs_call *call)
/* If there is a new replication site that we can use, ignore all the
* sites that aren't marked as new.
*/
- for (i = 0; i < AFS_NMAXNSERVERS; i++) {
+ for (i = 0; i < nr_servers; i++) {
tmp = ntohl(uvldb->serverFlags[i]);
if (!(tmp & AFS_VLSF_DONTUSE) &&
(tmp & AFS_VLSF_NEWREPSITE))
new_only = true;
}
- for (i = 0; i < AFS_NMAXNSERVERS; i++) {
+ for (i = 0; i < nr_servers; i++) {
struct afs_uuid__xdr *xdr;
struct afs_uuid *uuid;
int j;
diff --git a/fs/afs/volume.c b/fs/afs/volume.c
index 684c48293353e71058a5c151106ee805dfcf3752..b517a588781fe28657cd5d23eb6fd79e31cf0ea1 100644
--- a/fs/afs/volume.c
+++ b/fs/afs/volume.c
@@ -26,9 +26,8 @@ static struct afs_volume *afs_alloc_volume(struct afs_mount_params *params,
unsigned long type_mask)
{
struct afs_server_list *slist;
- struct afs_server *server;
struct afs_volume *volume;
- int ret = -ENOMEM, nr_servers = 0, i, j;
+ int ret = -ENOMEM, nr_servers = 0, i;
for (i = 0; i < vldb->nr_servers; i++)
if (vldb->fs_mask[i] & type_mask)
@@ -58,50 +57,10 @@ static struct afs_volume *afs_alloc_volume(struct afs_mount_params *params,
refcount_set(&slist->usage, 1);
volume->servers = slist;
-
- /* Make sure a records exists for each server this volume occupies. */
- for (i = 0; i < nr_servers; i++) {
- if (!(vldb->fs_mask[i] & type_mask))
- continue;
-
- server = afs_lookup_server(params->cell, params->key,
- &vldb->fs_server[i]);
- if (IS_ERR(server)) {
- ret = PTR_ERR(server);
- if (ret == -ENOENT)
- continue;
- goto error_2;
- }
-
- /* Insertion-sort by server pointer */
- for (j = 0; j < slist->nr_servers; j++)
- if (slist->servers[j].server >= server)
- break;
- if (j < slist->nr_servers) {
- if (slist->servers[j].server == server) {
- afs_put_server(params->net, server);
- continue;
- }
-
- memmove(slist->servers + j + 1,
- slist->servers + j,
- (slist->nr_servers - j) * sizeof(struct afs_server_entry));
- }
-
- slist->servers[j].server = server;
- slist->nr_servers++;
- }
-
- if (slist->nr_servers == 0) {
- ret = -EDESTADDRREQ;
- goto error_2;
- }
-
return volume;
-error_2:
- afs_put_serverlist(params->net, slist);
error_1:
+ afs_put_cell(params->net, volume->cell);
kfree(volume);
error_0:
return ERR_PTR(ret);
@@ -327,7 +286,7 @@ static int afs_update_volume_status(struct afs_volume *volume, struct key *key)
/* See if the volume's server list got updated. */
new = afs_alloc_server_list(volume->cell, key,
- vldb, (1 << volume->type));
+ vldb, (1 << volume->type));
if (IS_ERR(new)) {
ret = PTR_ERR(new);
goto error_vldb;
diff --git a/net/dns_resolver/dns_query.c b/net/dns_resolver/dns_query.c
index af781010753b0f0b53c89934ba79600aea5e2060..49da67034f29cd488053648a73dd140ac9e94063 100644
--- a/net/dns_resolver/dns_query.c
+++ b/net/dns_resolver/dns_query.c
@@ -52,11 +52,11 @@
* @name: Name to look up
* @namelen: Length of name
* @options: Request options (or NULL if no options)
- * @_result: Where to place the returned data.
+ * @_result: Where to place the returned data (or NULL)
* @_expiry: Where to store the result expiry time (or NULL)
*
- * The data will be returned in the pointer at *result, and the caller is
- * responsible for freeing it.
+ * The data will be returned in the pointer at *result, if provided, and the
+ * caller is responsible for freeing it.
*
* The description should be of the form "[<query_type>:]<domain_name>", and
* the options need to be appropriate for the query type requested. If no
@@ -81,7 +81,7 @@ int dns_query(const char *type, const char *name, size_t namelen,
kenter("%s,%*.*s,%zu,%s",
type, (int)namelen, (int)namelen, name, namelen, options);
- if (!name || namelen == 0 || !_result)
+ if (!name || namelen == 0)
return -EINVAL;
/* construct the query key description as "[<type>:]<name>" */
@@ -146,13 +146,15 @@ int dns_query(const char *type, const char *name, size_t namelen,
upayload = user_key_payload_locked(rkey);
len = upayload->datalen;
- ret = -ENOMEM;
- *_result = kmalloc(len + 1, GFP_KERNEL);
- if (!*_result)
- goto put;
+ if (_result) {
+ ret = -ENOMEM;
+ *_result = kmalloc(len + 1, GFP_KERNEL);
+ if (!*_result)
+ goto put;
- memcpy(*_result, upayload->data, len);
- (*_result)[len] = '\0';
+ memcpy(*_result, upayload->data, len);
+ (*_result)[len] = '\0';
+ }
if (_expiry)
*_expiry = rkey->expiry;