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[AFS]: Add "directory write" support.

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Add support for the create, link, symlink, unlink, mkdir, rmdir and
rename VFS operations to the in-kernel AFS filesystem.

Also:

 (1) Fix dentry and inode revalidation.  d_revalidate should only look at
     state of the dentry.  Revalidation of the contents of an inode pointed to
     by a dentry is now separate.

 (2) Fix afs_lookup() to hash negative dentries as well as positive ones.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David Howells 2007-04-26 15:59:35 -07:00 committed by David S. Miller
parent c35eccb1f6
commit 260a980317
14 changed files with 1779 additions and 269 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

26
fs/afs/afs.h
View File

@ -106,18 +106,36 @@ struct afs_file_status {
afs_file_type_t type; /* file type */
unsigned nlink; /* link count */
size_t size; /* file size */
u64 size; /* file size */
afs_dataversion_t data_version; /* current data version */
unsigned author; /* author ID */
unsigned owner; /* owner ID */
u32 author; /* author ID */
u32 owner; /* owner ID */
u32 group; /* group ID */
afs_access_t caller_access; /* access rights for authenticated caller */
afs_access_t anon_access; /* access rights for unauthenticated caller */
umode_t mode; /* UNIX mode */
struct afs_fid parent; /* parent file ID */
struct afs_fid parent; /* parent dir ID for non-dirs only */
time_t mtime_client; /* last time client changed data */
time_t mtime_server; /* last time server changed data */
};
/*
* AFS file status change request
*/
struct afs_store_status {
u32 mask; /* which bits of the struct are set */
u32 mtime_client; /* last time client changed data */
u32 owner; /* owner ID */
u32 group; /* group ID */
umode_t mode; /* UNIX mode */
};
#define AFS_SET_MTIME 0x01 /* set the mtime */
#define AFS_SET_OWNER 0x02 /* set the owner ID */
#define AFS_SET_GROUP 0x04 /* set the group ID (unsupported?) */
#define AFS_SET_MODE 0x08 /* set the UNIX mode */
#define AFS_SET_SEG_SIZE 0x10 /* set the segment size (unsupported) */
/*
* AFS volume synchronisation information
*/

11
fs/afs/afs_fs.h
View File

@ -16,12 +16,19 @@
#define FS_SERVICE 1 /* AFS File Service ID */
enum AFS_FS_Operations {
FSFETCHSTATUS = 132, /* AFS Fetch file status */
FSFETCHDATA = 130, /* AFS Fetch file data */
FSFETCHSTATUS = 132, /* AFS Fetch file status */
FSREMOVEFILE = 136, /* AFS Remove a file */
FSCREATEFILE = 137, /* AFS Create a file */
FSRENAME = 138, /* AFS Rename or move a file or directory */
FSSYMLINK = 139, /* AFS Create a symbolic link */
FSLINK = 140, /* AFS Create a hard link */
FSMAKEDIR = 141, /* AFS Create a directory */
FSREMOVEDIR = 142, /* AFS Remove a directory */
FSGIVEUPCALLBACKS = 147, /* AFS Discard callback promises */
FSGETVOLUMEINFO = 148, /* AFS Get root volume information */
FSGETROOTVOLUME = 151, /* AFS Get root volume name */
FSLOOKUP = 161 /* AFS lookup file in directory */
FSLOOKUP = 161, /* AFS lookup file in directory */
};
enum AFS_FS_Errors {

36
fs/afs/callback.c
View File

@ -44,7 +44,8 @@ void afs_init_callback_state(struct afs_server *server)
while (!RB_EMPTY_ROOT(&server->cb_promises)) {
vnode = rb_entry(server->cb_promises.rb_node,
struct afs_vnode, cb_promise);
printk("\nUNPROMISE on %p\n", vnode);
_debug("UNPROMISE { vid=%x vn=%u uq=%u}",
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
rb_erase(&vnode->cb_promise, &server->cb_promises);
vnode->cb_promised = false;
}
@ -68,7 +69,7 @@ void afs_broken_callback_work(struct work_struct *work)
/* we're only interested in dealing with a broken callback on *this*
* vnode and only if no-one else has dealt with it yet */
if (!mutex_trylock(&vnode->cb_broken_lock))
if (!mutex_trylock(&vnode->validate_lock))
return; /* someone else is dealing with it */
if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
@ -84,13 +85,14 @@ void afs_broken_callback_work(struct work_struct *work)
/* if the vnode's data version number changed then its contents
* are different */
if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
_debug("zap data");
_debug("zap data {%x:%u}",
vnode->fid.vid, vnode->fid.vnode);
invalidate_remote_inode(&vnode->vfs_inode);
}
}
out:
mutex_unlock(&vnode->cb_broken_lock);
mutex_unlock(&vnode->validate_lock);
/* avoid the potential race whereby the mutex_trylock() in this
* function happens again between the clear_bit() and the
@ -251,6 +253,32 @@ static void afs_do_give_up_callback(struct afs_server *server,
_leave("");
}
/*
* discard the callback on a deleted item
*/
void afs_discard_callback_on_delete(struct afs_vnode *vnode)
{
struct afs_server *server = vnode->server;
_enter("%d", vnode->cb_promised);
if (!vnode->cb_promised) {
_leave(" [not promised]");
return;
}
ASSERT(server != NULL);
spin_lock(&server->cb_lock);
if (vnode->cb_promised) {
ASSERT(server->cb_promises.rb_node != NULL);
rb_erase(&vnode->cb_promise, &server->cb_promises);
vnode->cb_promised = false;
}
spin_unlock(&server->cb_lock);
_leave("");
}
/*
* give up the callback registered for a vnode on the file server when the
* inode is being cleared

680
fs/afs/dir.c
View File

@ -18,40 +18,50 @@
#include <linux/ctype.h>
#include "internal.h"
static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd);
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd);
static int afs_dir_open(struct inode *inode, struct file *file);
static int afs_dir_readdir(struct file *file, void *dirent, filldir_t filldir);
static int afs_readdir(struct file *file, void *dirent, filldir_t filldir);
static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd);
static int afs_d_delete(struct dentry *dentry);
static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen,
static void afs_d_release(struct dentry *dentry);
static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
loff_t fpos, u64 ino, unsigned dtype);
static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd);
static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode);
static int afs_rmdir(struct inode *dir, struct dentry *dentry);
static int afs_unlink(struct inode *dir, struct dentry *dentry);
static int afs_link(struct dentry *from, struct inode *dir,
struct dentry *dentry);
static int afs_symlink(struct inode *dir, struct dentry *dentry,
const char *content);
static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry);
const struct file_operations afs_dir_file_operations = {
.open = afs_dir_open,
.release = afs_release,
.readdir = afs_dir_readdir,
.readdir = afs_readdir,
};
const struct inode_operations afs_dir_inode_operations = {
.lookup = afs_dir_lookup,
.create = afs_create,
.lookup = afs_lookup,
.link = afs_link,
.unlink = afs_unlink,
.symlink = afs_symlink,
.mkdir = afs_mkdir,
.rmdir = afs_rmdir,
.rename = afs_rename,
.permission = afs_permission,
.getattr = afs_inode_getattr,
#if 0 /* TODO */
.create = afs_dir_create,
.link = afs_dir_link,
.unlink = afs_dir_unlink,
.symlink = afs_dir_symlink,
.mkdir = afs_dir_mkdir,
.rmdir = afs_dir_rmdir,
.mknod = afs_dir_mknod,
.rename = afs_dir_rename,
#endif
};
static struct dentry_operations afs_fs_dentry_operations = {
.d_revalidate = afs_d_revalidate,
.d_delete = afs_d_delete,
.d_release = afs_d_release,
};
#define AFS_DIR_HASHTBL_SIZE 128
@ -103,7 +113,7 @@ struct afs_dir_page {
union afs_dir_block blocks[PAGE_SIZE / sizeof(union afs_dir_block)];
};
struct afs_dir_lookup_cookie {
struct afs_lookup_cookie {
struct afs_fid fid;
const char *name;
size_t nlen;
@ -299,7 +309,7 @@ static int afs_dir_iterate_block(unsigned *fpos,
nlen,
blkoff + offset * sizeof(union afs_dirent),
ntohl(dire->u.vnode),
filldir == afs_dir_lookup_filldir ?
filldir == afs_lookup_filldir ?
ntohl(dire->u.unique) : DT_UNKNOWN);
if (ret < 0) {
_leave(" = 0 [full]");
@ -379,7 +389,7 @@ out:
/*
* read an AFS directory
*/
static int afs_dir_readdir(struct file *file, void *cookie, filldir_t filldir)
static int afs_readdir(struct file *file, void *cookie, filldir_t filldir)
{
unsigned fpos;
int ret;
@ -403,10 +413,10 @@ static int afs_dir_readdir(struct file *file, void *cookie, filldir_t filldir)
* - if afs_dir_iterate_block() spots this function, it'll pass the FID
* uniquifier through dtype
*/
static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen,
loff_t fpos, u64 ino, unsigned dtype)
static int afs_lookup_filldir(void *_cookie, const char *name, int nlen,
loff_t fpos, u64 ino, unsigned dtype)
{
struct afs_dir_lookup_cookie *cookie = _cookie;
struct afs_lookup_cookie *cookie = _cookie;
_enter("{%s,%Zu},%s,%u,,%llu,%u",
cookie->name, cookie->nlen, name, nlen, ino, dtype);
@ -430,11 +440,12 @@ static int afs_dir_lookup_filldir(void *_cookie, const char *name, int nlen,
/*
* do a lookup in a directory
* - just returns the FID the dentry name maps to if found
*/
static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
struct afs_fid *fid, struct key *key)
{
struct afs_dir_lookup_cookie cookie;
struct afs_lookup_cookie cookie;
struct afs_super_info *as;
unsigned fpos;
int ret;
@ -450,7 +461,7 @@ static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
cookie.found = 0;
fpos = 0;
ret = afs_dir_iterate(dir, &fpos, &cookie, afs_dir_lookup_filldir,
ret = afs_dir_iterate(dir, &fpos, &cookie, afs_lookup_filldir,
key);
if (ret < 0) {
_leave(" = %d [iter]", ret);
@ -471,8 +482,8 @@ static int afs_do_lookup(struct inode *dir, struct dentry *dentry,
/*
* look up an entry in a directory
*/
static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
struct nameidata *nd)
{
struct afs_vnode *vnode;
struct afs_fid fid;
@ -480,14 +491,18 @@ static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
struct key *key;
int ret;
_enter("{%lu},%p{%s}", dir->i_ino, dentry, dentry->d_name.name);
vnode = AFS_FS_I(dir);
_enter("{%x:%d},%p{%s},",
vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);
ASSERTCMP(dentry->d_inode, ==, NULL);
if (dentry->d_name.len > 255) {
_leave(" = -ENAMETOOLONG");
return ERR_PTR(-ENAMETOOLONG);
}
vnode = AFS_FS_I(dir);
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
_leave(" = -ESTALE");
return ERR_PTR(-ESTALE);
@ -499,15 +514,28 @@ static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
return ERR_PTR(PTR_ERR(key));
}
ret = afs_do_lookup(dir, dentry, &fid, key);
ret = afs_validate(vnode, key);
if (ret < 0) {
key_put(key);
_leave(" = %d [do]", ret);
_leave(" = %d [val]", ret);
return ERR_PTR(ret);
}
ret = afs_do_lookup(dir, dentry, &fid, key);
if (ret < 0) {
key_put(key);
if (ret == -ENOENT) {
d_add(dentry, NULL);
_leave(" = NULL [negative]");
return NULL;
}
_leave(" = %d [do]", ret);
return ERR_PTR(ret);
}
dentry->d_fsdata = (void *)(unsigned long) vnode->status.data_version;
/* instantiate the dentry */
inode = afs_iget(dir->i_sb, key, &fid);
inode = afs_iget(dir->i_sb, key, &fid, NULL, NULL);
key_put(key);
if (IS_ERR(inode)) {
_leave(" = %ld", PTR_ERR(inode));
@ -526,106 +554,65 @@ static struct dentry *afs_dir_lookup(struct inode *dir, struct dentry *dentry,
return NULL;
}
/*
* propagate changed and modified flags on a directory to all the children of
* that directory as they may indicate that the ACL on the dir has changed,
* potentially rendering the child inaccessible or that a file has been deleted
* or renamed
*/
static void afs_propagate_dir_changes(struct dentry *dir)
{
struct dentry *child;
bool c, m;
c = test_bit(AFS_VNODE_CHANGED, &AFS_FS_I(dir->d_inode)->flags);
m = test_bit(AFS_VNODE_MODIFIED, &AFS_FS_I(dir->d_inode)->flags);
_enter("{%d,%d}", c, m);
spin_lock(&dir->d_lock);
list_for_each_entry(child, &dir->d_subdirs, d_u.d_child) {
if (child->d_inode) {
struct afs_vnode *vnode;
_debug("tag %s", child->d_name.name);
vnode = AFS_FS_I(child->d_inode);
if (c)
set_bit(AFS_VNODE_DIR_CHANGED, &vnode->flags);
if (m)
set_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags);
}
}
spin_unlock(&dir->d_lock);
}
/*
* 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
* inode
* - there are several things we need to check
* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
* symlink)
* - parent dir metadata changed (security changes)
* - dentry data changed (write, truncate)
* - dentry metadata changed (security changes)
*/
static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
{
struct afs_vnode *vnode;
struct afs_vnode *vnode, *dir;
struct afs_fid fid;
struct dentry *parent;
struct inode *inode, *dir;
struct key *key;
void *dir_version;
int ret;
vnode = AFS_FS_I(dentry->d_inode);
_enter("{sb=%p n=%s fl=%lx},",
dentry->d_sb, dentry->d_name.name, vnode->flags);
if (dentry->d_inode)
_enter("{v={%x:%u} n=%s fl=%lx},",
vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name,
vnode->flags);
else
_enter("{neg n=%s}", dentry->d_name.name);
key = afs_request_key(vnode->volume->cell);
key = afs_request_key(AFS_FS_S(dentry->d_sb)->volume->cell);
if (IS_ERR(key))
key = NULL;
/* lock down the parent dentry so we can peer at it */
parent = dget_parent(dentry);
dir = parent->d_inode;
inode = dentry->d_inode;
/* handle a negative dentry */
if (!inode)
if (!parent->d_inode)
goto out_bad;
/* handle a bad inode */
if (is_bad_inode(inode)) {
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
dir = AFS_FS_I(parent->d_inode);
/* check that this dirent still exists if the directory's contents were
* modified */
if (test_bit(AFS_VNODE_DELETED, &AFS_FS_I(dir)->flags)) {
/* validate the parent directory */
if (test_bit(AFS_VNODE_MODIFIED, &dir->flags))
afs_validate(dir, key);
if (test_bit(AFS_VNODE_DELETED, &dir->flags)) {
_debug("%s: parent dir deleted", dentry->d_name.name);
goto out_bad;
}
if (test_and_clear_bit(AFS_VNODE_DIR_MODIFIED, &vnode->flags)) {
/* rm/rmdir/rename may have occurred */
_debug("dir modified");
dir_version = (void *) (unsigned long) dir->status.data_version;
if (dentry->d_fsdata == dir_version)
goto out_valid; /* the dir contents are unchanged */
/* search the directory for this vnode */
ret = afs_do_lookup(dir, dentry, &fid, key);
if (ret == -ENOENT) {
_debug("%s: dirent not found", dentry->d_name.name);
goto not_found;
}
if (ret < 0) {
_debug("failed to iterate dir %s: %d",
parent->d_name.name, ret);
_debug("dir modified");
/* search the directory for this vnode */
ret = afs_do_lookup(&dir->vfs_inode, dentry, &fid, key);
switch (ret) {
case 0:
/* the filename maps to something */
if (!dentry->d_inode)
goto out_bad;
if (is_bad_inode(dentry->d_inode)) {
printk("kAFS: afs_d_revalidate: %s/%s has bad inode\n",
parent->d_name.name, dentry->d_name.name);
goto out_bad;
}
@ -639,56 +626,35 @@ static int afs_d_revalidate(struct dentry *dentry, struct nameidata *nd)
}
/* if the vnode ID uniqifier has changed, then the file has
* been deleted */
* been deleted and replaced, and the original vnode ID has
* been reused */
if (fid.unique != vnode->fid.unique) {
_debug("%s: file deleted (uq %u -> %u I:%lu)",
dentry->d_name.name, fid.unique,
vnode->fid.unique, inode->i_version);
vnode->fid.unique, dentry->d_inode->i_version);
spin_lock(&vnode->lock);
set_bit(AFS_VNODE_DELETED, &vnode->flags);
spin_unlock(&vnode->lock);
invalidate_remote_inode(inode);
goto out_bad;
goto not_found;
}
}
goto out_valid;
/* if the directory's metadata were changed then the security may be
* different and we may no longer have access */
mutex_lock(&vnode->cb_broken_lock);
case -ENOENT:
/* the filename is unknown */
_debug("%s: dirent not found", dentry->d_name.name);
if (dentry->d_inode)
goto not_found;
goto out_valid;
if (test_and_clear_bit(AFS_VNODE_DIR_CHANGED, &vnode->flags) ||
test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
_debug("%s: changed", dentry->d_name.name);
set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
if (afs_vnode_fetch_status(vnode, NULL, key) < 0) {
mutex_unlock(&vnode->cb_broken_lock);
goto out_bad;
}
}
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
_debug("%s: file already deleted", dentry->d_name.name);
mutex_unlock(&vnode->cb_broken_lock);
default:
_debug("failed to iterate dir %s: %d",
parent->d_name.name, ret);
goto out_bad;
}
/* if the vnode's data version number changed then its contents are
* different */
if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
_debug("zap data");
invalidate_remote_inode(inode);
}
if (S_ISDIR(inode->i_mode) &&
(test_bit(AFS_VNODE_CHANGED, &vnode->flags) ||
test_bit(AFS_VNODE_MODIFIED, &vnode->flags)))
afs_propagate_dir_changes(dentry);
clear_bit(AFS_VNODE_CHANGED, &vnode->flags);
clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
mutex_unlock(&vnode->cb_broken_lock);
out_valid:
dentry->d_fsdata = dir_version;
out_skip:
dput(parent);
key_put(key);
_leave(" = 1 [valid]");
@ -701,10 +667,10 @@ not_found:
spin_unlock(&dentry->d_lock);
out_bad:
if (inode) {
if (dentry->d_inode) {
/* don't unhash if we have submounts */
if (have_submounts(dentry))
goto out_valid;
goto out_skip;
}
_debug("dropping dentry %s/%s",
@ -742,3 +708,433 @@ zap:
_leave(" = 1 [zap]");
return 1;
}
/*
* handle dentry release
*/
static void afs_d_release(struct dentry *dentry)
{
_enter("%s", dentry->d_name.name);
}
/*
* create a directory on an AFS filesystem
*/
static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
{
struct afs_file_status status;
struct afs_callback cb;
struct afs_server *server;
struct afs_vnode *dvnode, *vnode;
struct afs_fid fid;
struct inode *inode;
struct key *key;
int ret;
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s},%o",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
ret = -ENAMETOOLONG;
if (dentry->d_name.len > 255)
goto error;
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
mode |= S_IFDIR;
ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
mode, &fid, &status, &cb, &server);
if (ret < 0)
goto mkdir_error;
inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
if (IS_ERR(inode)) {
/* ENOMEM at a really inconvenient time - just abandon the new
* directory on the server */
ret = PTR_ERR(inode);
goto iget_error;
}
/* apply the status report we've got for the new vnode */
vnode = AFS_FS_I(inode);
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
d_instantiate(dentry, inode);
if (d_unhashed(dentry)) {
_debug("not hashed");
d_rehash(dentry);
}
key_put(key);
_leave(" = 0");
return 0;
iget_error:
afs_put_server(server);
mkdir_error:
key_put(key);
error:
d_drop(dentry);
_leave(" = %d", ret);
return ret;
}
/*
* remove a directory from an AFS filesystem
*/
static int afs_rmdir(struct inode *dir, struct dentry *dentry)
{
struct afs_vnode *dvnode, *vnode;
struct key *key;
int ret;
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s}",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
ret = -ENAMETOOLONG;
if (dentry->d_name.len > 255)
goto error;
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, true);
if (ret < 0)
goto rmdir_error;
if (dentry->d_inode) {
vnode = AFS_FS_I(dentry->d_inode);
clear_nlink(&vnode->vfs_inode);
set_bit(AFS_VNODE_DELETED, &vnode->flags);
afs_discard_callback_on_delete(vnode);
}
key_put(key);
_leave(" = 0");
return 0;
rmdir_error:
key_put(key);
error:
_leave(" = %d", ret);
return ret;
}
/*
* remove a file from an AFS filesystem
*/
static int afs_unlink(struct inode *dir, struct dentry *dentry)
{
struct afs_vnode *dvnode, *vnode;
struct key *key;
int ret;
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s}",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
ret = -ENAMETOOLONG;
if (dentry->d_name.len > 255)
goto error;
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
if (dentry->d_inode) {
vnode = AFS_FS_I(dentry->d_inode);
/* make sure we have a callback promise on the victim */
ret = afs_validate(vnode, key);
if (ret < 0)
goto error;
}
ret = afs_vnode_remove(dvnode, key, dentry->d_name.name, false);
if (ret < 0)
goto remove_error;
if (dentry->d_inode) {
/* if the file wasn't deleted due to excess hard links, the
* fileserver will break the callback promise on the file - if
* it had one - before it returns to us, and if it was deleted,
* it won't
*
* however, if we didn't have a callback promise outstanding,
* or it was outstanding on a different server, then it won't
* break it either...
*/
vnode = AFS_FS_I(dentry->d_inode);
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
_debug("AFS_VNODE_DELETED");
if (test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags))
_debug("AFS_VNODE_CB_BROKEN");
set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
ret = afs_validate(vnode, key);
_debug("nlink %d [val %d]", vnode->vfs_inode.i_nlink, ret);
}
key_put(key);
_leave(" = 0");
return 0;
remove_error:
key_put(key);
error:
_leave(" = %d", ret);
return ret;
}
/*
* create a regular file on an AFS filesystem
*/
static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
struct nameidata *nd)
{
struct afs_file_status status;
struct afs_callback cb;
struct afs_server *server;
struct afs_vnode *dvnode, *vnode;
struct afs_fid fid;
struct inode *inode;
struct key *key;
int ret;
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s},%o,",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
ret = -ENAMETOOLONG;
if (dentry->d_name.len > 255)
goto error;
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
mode |= S_IFREG;
ret = afs_vnode_create(dvnode, key, dentry->d_name.name,
mode, &fid, &status, &cb, &server);
if (ret < 0)
goto create_error;
inode = afs_iget(dir->i_sb, key, &fid, &status, &cb);
if (IS_ERR(inode)) {
/* ENOMEM at a really inconvenient time - just abandon the new
* directory on the server */
ret = PTR_ERR(inode);
goto iget_error;
}
/* apply the status report we've got for the new vnode */
vnode = AFS_FS_I(inode);
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
d_instantiate(dentry, inode);
if (d_unhashed(dentry)) {
_debug("not hashed");
d_rehash(dentry);
}
key_put(key);
_leave(" = 0");
return 0;
iget_error:
afs_put_server(server);
create_error:
key_put(key);
error:
d_drop(dentry);
_leave(" = %d", ret);
return ret;
}
/*
* create a hard link between files in an AFS filesystem
*/
static int afs_link(struct dentry *from, struct inode *dir,
struct dentry *dentry)
{
struct afs_vnode *dvnode, *vnode;
struct key *key;
int ret;
vnode = AFS_FS_I(from->d_inode);
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%x:%d},{%s}",
vnode->fid.vid, vnode->fid.vnode,
dvnode->fid.vid, dvnode->fid.vnode,
dentry->d_name.name);
ret = -ENAMETOOLONG;
if (dentry->d_name.len > 255)
goto error;
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
ret = afs_vnode_link(dvnode, vnode, key, dentry->d_name.name);
if (ret < 0)
goto link_error;
atomic_inc(&vnode->vfs_inode.i_count);
d_instantiate(dentry, &vnode->vfs_inode);
key_put(key);
_leave(" = 0");
return 0;
link_error:
key_put(key);
error:
d_drop(dentry);
_leave(" = %d", ret);
return ret;
}
/*
* create a symlink in an AFS filesystem
*/
static int afs_symlink(struct inode *dir, struct dentry *dentry,
const char *content)
{
struct afs_file_status status;
struct afs_server *server;
struct afs_vnode *dvnode, *vnode;
struct afs_fid fid;
struct inode *inode;
struct key *key;
int ret;
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s},%s",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name,
content);
ret = -ENAMETOOLONG;
if (dentry->d_name.len > 255)
goto error;
ret = -EINVAL;
if (strlen(content) > 1023)
goto error;
key = afs_request_key(dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
ret = afs_vnode_symlink(dvnode, key, dentry->d_name.name, content,
&fid, &status, &server);
if (ret < 0)
goto create_error;
inode = afs_iget(dir->i_sb, key, &fid, &status, NULL);
if (IS_ERR(inode)) {
/* ENOMEM at a really inconvenient time - just abandon the new
* directory on the server */
ret = PTR_ERR(inode);
goto iget_error;
}
/* apply the status report we've got for the new vnode */
vnode = AFS_FS_I(inode);
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
d_instantiate(dentry, inode);
if (d_unhashed(dentry)) {
_debug("not hashed");
d_rehash(dentry);
}
key_put(key);
_leave(" = 0");
return 0;
iget_error:
afs_put_server(server);
create_error:
key_put(key);
error:
d_drop(dentry);
_leave(" = %d", ret);
return ret;
}
/*
* rename a file in an AFS filesystem and/or move it between directories
*/
static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
struct inode *new_dir, struct dentry *new_dentry)
{
struct afs_vnode *orig_dvnode, *new_dvnode, *vnode;
struct key *key;
int ret;
vnode = AFS_FS_I(old_dentry->d_inode);
orig_dvnode = AFS_FS_I(old_dir);
new_dvnode = AFS_FS_I(new_dir);
_enter("{%x:%d},{%x:%d},{%x:%d},{%s}",
orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
vnode->fid.vid, vnode->fid.vnode,
new_dvnode->fid.vid, new_dvnode->fid.vnode,
new_dentry->d_name.name);
ret = -ENAMETOOLONG;
if (new_dentry->d_name.len > 255)
goto error;
key = afs_request_key(orig_dvnode->volume->cell);
if (IS_ERR(key)) {
ret = PTR_ERR(key);
goto error;
}
ret = afs_vnode_rename(orig_dvnode, new_dvnode, key,
old_dentry->d_name.name,
new_dentry->d_name.name);
if (ret < 0)
goto rename_error;
key_put(key);
_leave(" = 0");
return 0;
rename_error:
key_put(key);
error:
d_drop(new_dentry);
_leave(" = %d", ret);
return ret;
}

7
fs/afs/file.c
View File

@ -50,6 +50,7 @@ int afs_open(struct inode *inode, struct file *file)
{
struct afs_vnode *vnode = AFS_FS_I(inode);
struct key *key;
int ret;
_enter("{%x:%x},", vnode->fid.vid, vnode->fid.vnode);
@ -59,6 +60,12 @@ int afs_open(struct inode *inode, struct file *file)
return PTR_ERR(key);
}
ret = afs_validate(vnode, key);
if (ret < 0) {
_leave(" = %d [val]", ret);
return ret;
}
file->private_data = key;
_leave(" = 0");
return 0;

623
fs/afs/fsclient.c
View File

@ -15,15 +15,29 @@
#include "internal.h"
#include "afs_fs.h"
/*
* decode an AFSFid block
*/
static void xdr_decode_AFSFid(const __be32 **_bp, struct afs_fid *fid)
{
const __be32 *bp = *_bp;
fid->vid = ntohl(*bp++);
fid->vnode = ntohl(*bp++);
fid->unique = ntohl(*bp++);
*_bp = bp;
}
/*
* decode an AFSFetchStatus block
*/
static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
struct afs_file_status *status,
struct afs_vnode *vnode)
{
const __be32 *bp = *_bp;
umode_t mode;
u64 data_version;
u64 data_version, size;
u32 changed = 0; /* becomes non-zero if ctime-type changes seen */
#define EXTRACT(DST) \
@ -33,55 +47,68 @@ static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
DST = x; \
} while (0)
vnode->status.if_version = ntohl(*bp++);
EXTRACT(vnode->status.type);
vnode->status.nlink = ntohl(*bp++);
EXTRACT(vnode->status.size);
status->if_version = ntohl(*bp++);
EXTRACT(status->type);
EXTRACT(status->nlink);
size = ntohl(*bp++);
data_version = ntohl(*bp++);
EXTRACT(vnode->status.author);
EXTRACT(vnode->status.owner);
EXTRACT(vnode->status.caller_access); /* call ticket dependent */
EXTRACT(vnode->status.anon_access);
EXTRACT(vnode->status.mode);
vnode->status.parent.vid = vnode->fid.vid;
EXTRACT(vnode->status.parent.vnode);
EXTRACT(vnode->status.parent.unique);
EXTRACT(status->author);
EXTRACT(status->owner);
EXTRACT(status->caller_access); /* call ticket dependent */
EXTRACT(status->anon_access);
EXTRACT(status->mode);
EXTRACT(status->parent.vnode);
EXTRACT(status->parent.unique);
bp++; /* seg size */
vnode->status.mtime_client = ntohl(*bp++);
vnode->status.mtime_server = ntohl(*bp++);
bp++; /* group */
status->mtime_client = ntohl(*bp++);
status->mtime_server = ntohl(*bp++);
EXTRACT(status->group);
bp++; /* sync counter */
data_version |= (u64) ntohl(*bp++) << 32;
bp++; /* spare2 */
bp++; /* spare3 */
bp++; /* spare4 */
bp++; /* lock count */
size |= (u64) ntohl(*bp++) << 32;
bp++; /* spare 4 */
*_bp = bp;
if (changed) {
_debug("vnode changed");
set_bit(AFS_VNODE_CHANGED, &vnode->flags);
vnode->vfs_inode.i_uid = vnode->status.owner;
vnode->vfs_inode.i_size = vnode->status.size;
vnode->vfs_inode.i_version = vnode->fid.unique;
vnode->status.mode &= S_IALLUGO;
mode = vnode->vfs_inode.i_mode;
mode &= ~S_IALLUGO;
mode |= vnode->status.mode;
vnode->vfs_inode.i_mode = mode;
if (size != status->size) {
status->size = size;
changed |= true;
}
status->mode &= S_IALLUGO;
_debug("vnode time %lx, %lx",
vnode->status.mtime_client, vnode->status.mtime_server);
vnode->vfs_inode.i_ctime.tv_sec = vnode->status.mtime_server;
vnode->vfs_inode.i_mtime = vnode->vfs_inode.i_ctime;
vnode->vfs_inode.i_atime = vnode->vfs_inode.i_ctime;
status->mtime_client, status->mtime_server);
if (vnode->status.data_version != data_version) {
_debug("vnode modified %llx", data_version);
vnode->status.data_version = data_version;
set_bit(AFS_VNODE_MODIFIED, &vnode->flags);
set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
if (vnode) {
status->parent.vid = vnode->fid.vid;
if (changed && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
_debug("vnode changed");
i_size_write(&vnode->vfs_inode, size);
vnode->vfs_inode.i_uid = status->owner;
vnode->vfs_inode.i_gid = status->group;
vnode->vfs_inode.i_version = vnode->fid.unique;
vnode->vfs_inode.i_nlink = status->nlink;
mode = vnode->vfs_inode.i_mode;
mode &= ~S_IALLUGO;
mode |= status->mode;
barrier();
vnode->vfs_inode.i_mode = mode;
}
vnode->vfs_inode.i_ctime.tv_sec = status->mtime_server;
vnode->vfs_inode.i_mtime = vnode->vfs_inode.i_ctime;
vnode->vfs_inode.i_atime = vnode->vfs_inode.i_ctime;
}
if (status->data_version != data_version) {
status->data_version = data_version;
if (vnode && !test_bit(AFS_VNODE_UNSET, &vnode->flags)) {
_debug("vnode modified %llx on {%x:%u}",
data_version, vnode->fid.vid, vnode->fid.vnode);
set_bit(AFS_VNODE_MODIFIED, &vnode->flags);
set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
}
}
}
@ -99,6 +126,17 @@ static void xdr_decode_AFSCallBack(const __be32 **_bp, struct afs_vnode *vnode)
*_bp = bp;
}
static void xdr_decode_AFSCallBack_raw(const __be32 **_bp,
struct afs_callback *cb)
{
const __be32 *bp = *_bp;
cb->version = ntohl(*bp++);
cb->expiry = ntohl(*bp++);
cb->type = ntohl(*bp++);
*_bp = bp;
}
/*
* decode an AFSVolSync block
*/
@ -122,6 +160,7 @@ static void xdr_decode_AFSVolSync(const __be32 **_bp,
static int afs_deliver_fs_fetch_status(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter(",,%u", last);
@ -135,8 +174,8 @@ static int afs_deliver_fs_fetch_status(struct afs_call *call,
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, call->reply);
xdr_decode_AFSCallBack(&bp, call->reply);
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode);
xdr_decode_AFSCallBack(&bp, vnode);
if (call->reply2)
xdr_decode_AFSVolSync(&bp, call->reply2);
@ -166,9 +205,10 @@ int afs_fs_fetch_file_status(struct afs_server *server,
struct afs_call *call;
__be32 *bp;
_enter(",%x,,,", key_serial(key));
_enter(",%x,{%x:%d},,",
key_serial(key), vnode->fid.vid, vnode->fid.vnode);
call = afs_alloc_flat_call(&afs_RXFSFetchStatus, 16, 120);
call = afs_alloc_flat_call(&afs_RXFSFetchStatus, 16, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
@ -194,6 +234,7 @@ int afs_fs_fetch_file_status(struct afs_server *server,
static int afs_deliver_fs_fetch_data(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
struct page *page;
void *buffer;
@ -248,7 +289,8 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
/* extract the metadata */
case 3:
ret = afs_extract_data(call, skb, last, call->buffer, 120);
ret = afs_extract_data(call, skb, last, call->buffer,
(21 + 3 + 6) * 4);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
@ -256,8 +298,8 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
}
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, call->reply);
xdr_decode_AFSCallBack(&bp, call->reply);
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode);
xdr_decode_AFSCallBack(&bp, vnode);
if (call->reply2)
xdr_decode_AFSVolSync(&bp, call->reply2);
@ -296,7 +338,6 @@ int afs_fs_fetch_data(struct afs_server *server,
struct afs_vnode *vnode,
off_t offset, size_t length,
struct page *buffer,
struct afs_volsync *volsync,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
@ -304,13 +345,13 @@ int afs_fs_fetch_data(struct afs_server *server,
_enter("");
call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, 120);
call = afs_alloc_flat_call(&afs_RXFSFetchData, 24, (21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = volsync;
call->reply2 = NULL; /* volsync */
call->reply3 = buffer;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
@ -411,3 +452,485 @@ int afs_fs_give_up_callbacks(struct afs_server *server,
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.CreateFile or an FS.MakeDir
*/
static int afs_deliver_fs_create_vnode(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->reply2);
xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL);
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode);
xdr_decode_AFSCallBack_raw(&bp, call->reply4);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.CreateFile and FS.MakeDir operation type
*/
static const struct afs_call_type afs_RXFSCreateXXXX = {
.name = "FS.CreateXXXX",
.deliver = afs_deliver_fs_create_vnode,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* create a file or make a directory
*/
int afs_fs_create(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
const char *name,
umode_t mode,
struct afs_fid *newfid,
struct afs_file_status *newstatus,
struct afs_callback *newcb,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz + (6 * 4);
call = afs_alloc_flat_call(&afs_RXFSCreateXXXX, reqsz,
(3 + 21 + 21 + 3 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = newfid;
call->reply3 = newstatus;
call->reply4 = newcb;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(S_ISDIR(mode) ? FSMAKEDIR : FSCREATEFILE);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
*bp++ = htonl(AFS_SET_MODE);
*bp++ = 0; /* mtime */
*bp++ = 0; /* owner */
*bp++ = 0; /* group */
*bp++ = htonl(mode & S_IALLUGO); /* unix mode */
*bp++ = 0; /* segment size */
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.RemoveFile or FS.RemoveDir
*/
static int afs_deliver_fs_remove(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.RemoveDir/FS.RemoveFile operation type
*/
static const struct afs_call_type afs_RXFSRemoveXXXX = {
.name = "FS.RemoveXXXX",
.deliver = afs_deliver_fs_remove,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* remove a file or directory
*/
int afs_fs_remove(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
const char *name,
bool isdir,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz;
call = afs_alloc_flat_call(&afs_RXFSRemoveXXXX, reqsz, (21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(isdir ? FSREMOVEDIR : FSREMOVEFILE);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.Link
*/
static int afs_deliver_fs_link(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *dvnode = call->reply, *vnode = call->reply2;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode);
xdr_decode_AFSFetchStatus(&bp, &dvnode->status, dvnode);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.Link operation type
*/
static const struct afs_call_type afs_RXFSLink = {
.name = "FS.Link",
.deliver = afs_deliver_fs_link,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* make a hard link
*/
int afs_fs_link(struct afs_server *server,
struct key *key,
struct afs_vnode *dvnode,
struct afs_vnode *vnode,
const char *name,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
reqsz = (5 * 4) + namesz + padsz + (3 * 4);
call = afs_alloc_flat_call(&afs_RXFSLink, reqsz, (21 + 21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = dvnode;
call->reply2 = vnode;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSLINK);
*bp++ = htonl(dvnode->fid.vid);
*bp++ = htonl(dvnode->fid.vnode);
*bp++ = htonl(dvnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.Symlink
*/
static int afs_deliver_fs_symlink(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *vnode = call->reply;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFid(&bp, call->reply2);
xdr_decode_AFSFetchStatus(&bp, call->reply3, NULL);
xdr_decode_AFSFetchStatus(&bp, &vnode->status, vnode);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.Symlink operation type
*/
static const struct afs_call_type afs_RXFSSymlink = {
.name = "FS.Symlink",
.deliver = afs_deliver_fs_symlink,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* create a symbolic link
*/
int afs_fs_symlink(struct afs_server *server,
struct key *key,
struct afs_vnode *vnode,
const char *name,
const char *contents,
struct afs_fid *newfid,
struct afs_file_status *newstatus,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t namesz, reqsz, padsz, c_namesz, c_padsz;
__be32 *bp;
_enter("");
namesz = strlen(name);
padsz = (4 - (namesz & 3)) & 3;
c_namesz = strlen(contents);
c_padsz = (4 - (c_namesz & 3)) & 3;
reqsz = (6 * 4) + namesz + padsz + c_namesz + c_padsz + (6 * 4);
call = afs_alloc_flat_call(&afs_RXFSSymlink, reqsz,
(3 + 21 + 21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = vnode;
call->reply2 = newfid;
call->reply3 = newstatus;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSSYMLINK);
*bp++ = htonl(vnode->fid.vid);
*bp++ = htonl(vnode->fid.vnode);
*bp++ = htonl(vnode->fid.unique);
*bp++ = htonl(namesz);
memcpy(bp, name, namesz);
bp = (void *) bp + namesz;
if (padsz > 0) {
memset(bp, 0, padsz);
bp = (void *) bp + padsz;
}
*bp++ = htonl(c_namesz);
memcpy(bp, contents, c_namesz);
bp = (void *) bp + c_namesz;
if (c_padsz > 0) {
memset(bp, 0, c_padsz);
bp = (void *) bp + c_padsz;
}
*bp++ = htonl(AFS_SET_MODE);
*bp++ = 0; /* mtime */
*bp++ = 0; /* owner */
*bp++ = 0; /* group */
*bp++ = htonl(S_IRWXUGO); /* unix mode */
*bp++ = 0; /* segment size */
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}
/*
* deliver reply data to an FS.Rename
*/
static int afs_deliver_fs_rename(struct afs_call *call,
struct sk_buff *skb, bool last)
{
struct afs_vnode *orig_dvnode = call->reply, *new_dvnode = call->reply2;
const __be32 *bp;
_enter("{%u},{%u},%d", call->unmarshall, skb->len, last);
afs_transfer_reply(call, skb);
if (!last)
return 0;
if (call->reply_size != call->reply_max)
return -EBADMSG;
/* unmarshall the reply once we've received all of it */
bp = call->buffer;
xdr_decode_AFSFetchStatus(&bp, &orig_dvnode->status, orig_dvnode);
if (new_dvnode != orig_dvnode)
xdr_decode_AFSFetchStatus(&bp, &new_dvnode->status, new_dvnode);
/* xdr_decode_AFSVolSync(&bp, call->replyX); */
_leave(" = 0 [done]");
return 0;
}
/*
* FS.Rename operation type
*/
static const struct afs_call_type afs_RXFSRename = {
.name = "FS.Rename",
.deliver = afs_deliver_fs_rename,
.abort_to_error = afs_abort_to_error,
.destructor = afs_flat_call_destructor,
};
/*
* create a symbolic link
*/
int afs_fs_rename(struct afs_server *server,
struct key *key,
struct afs_vnode *orig_dvnode,
const char *orig_name,
struct afs_vnode *new_dvnode,
const char *new_name,
const struct afs_wait_mode *wait_mode)
{
struct afs_call *call;
size_t reqsz, o_namesz, o_padsz, n_namesz, n_padsz;
__be32 *bp;
_enter("");
o_namesz = strlen(orig_name);
o_padsz = (4 - (o_namesz & 3)) & 3;
n_namesz = strlen(new_name);
n_padsz = (4 - (n_namesz & 3)) & 3;
reqsz = (4 * 4) +
4 + o_namesz + o_padsz +
(3 * 4) +
4 + n_namesz + n_padsz;
call = afs_alloc_flat_call(&afs_RXFSRename, reqsz, (21 + 21 + 6) * 4);
if (!call)
return -ENOMEM;
call->key = key;
call->reply = orig_dvnode;
call->reply2 = new_dvnode;
call->service_id = FS_SERVICE;
call->port = htons(AFS_FS_PORT);
/* marshall the parameters */
bp = call->request;
*bp++ = htonl(FSRENAME);
*bp++ = htonl(orig_dvnode->fid.vid);
*bp++ = htonl(orig_dvnode->fid.vnode);
*bp++ = htonl(orig_dvnode->fid.unique);
*bp++ = htonl(o_namesz);
memcpy(bp, orig_name, o_namesz);
bp = (void *) bp + o_namesz;
if (o_padsz > 0) {
memset(bp, 0, o_padsz);
bp = (void *) bp + o_padsz;
}
*bp++ = htonl(new_dvnode->fid.vid);
*bp++ = htonl(new_dvnode->fid.vnode);
*bp++ = htonl(new_dvnode->fid.unique);
*bp++ = htonl(n_namesz);
memcpy(bp, new_name, n_namesz);
bp = (void *) bp + n_namesz;
if (n_padsz > 0) {
memset(bp, 0, n_padsz);
bp = (void *) bp + n_padsz;
}
return afs_make_call(&server->addr, call, GFP_NOFS, wait_mode);
}

115
fs/afs/inode.c
View File

@ -33,7 +33,7 @@ static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key)
{
struct inode *inode = AFS_VNODE_TO_I(vnode);
_debug("FS: ft=%d lk=%d sz=%Zu ver=%Lu mod=%hu",
_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
vnode->status.type,
vnode->status.nlink,
vnode->status.size,
@ -115,8 +115,9 @@ static int afs_iget5_set(struct inode *inode, void *opaque)
/*
* inode retrieval
*/
inline struct inode *afs_iget(struct super_block *sb, struct key *key,
struct afs_fid *fid)
struct inode *afs_iget(struct super_block *sb, struct key *key,
struct afs_fid *fid, struct afs_file_status *status,
struct afs_callback *cb)
{
struct afs_iget_data data = { .fid = *fid };
struct afs_super_info *as;
@ -156,16 +157,37 @@ inline struct inode *afs_iget(struct super_block *sb, struct key *key,
&vnode->cache);
#endif
/* okay... it's a new inode */
set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
ret = afs_vnode_fetch_status(vnode, NULL, key);
if (ret < 0)
goto bad_inode;
if (!status) {
/* it's a remotely extant inode */
set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
ret = afs_vnode_fetch_status(vnode, NULL, key);
if (ret < 0)
goto bad_inode;
} else {
/* it's an inode we just created */
memcpy(&vnode->status, status, sizeof(vnode->status));
if (!cb) {
/* it's a symlink we just created (the fileserver
* didn't give us a callback) */
vnode->cb_version = 0;
vnode->cb_expiry = 0;
vnode->cb_type = 0;
vnode->cb_expires = get_seconds();
} else {
vnode->cb_version = cb->version;
vnode->cb_expiry = cb->expiry;
vnode->cb_type = cb->type;
vnode->cb_expires = vnode->cb_expiry + get_seconds();
}
}
ret = afs_inode_map_status(vnode, key);
if (ret < 0)
goto bad_inode;
/* success */
clear_bit(AFS_VNODE_UNSET, &vnode->flags);
inode->i_flags |= S_NOATIME;
unlock_new_inode(inode);
_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type);
@ -181,6 +203,78 @@ bad_inode:
return ERR_PTR(ret);
}
/*
* validate a vnode/inode
* - there are several things we need to check
* - parent dir data changes (rm, rmdir, rename, mkdir, create, link,
* symlink)
* - parent dir metadata changed (security changes)
* - dentry data changed (write, truncate)
* - dentry metadata changed (security changes)
*/
int afs_validate(struct afs_vnode *vnode, struct key *key)
{
int ret;
_enter("{v={%x:%u} fl=%lx},%x",
vnode->fid.vid, vnode->fid.vnode, vnode->flags,
key_serial(key));
if (vnode->cb_promised &&
!test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) &&
!test_bit(AFS_VNODE_MODIFIED, &vnode->flags) &&
!test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
if (vnode->cb_expires < get_seconds() + 10) {
_debug("callback expired");
set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
} else {
goto valid;
}
}
if (test_bit(AFS_VNODE_DELETED, &vnode->flags))
goto valid;
mutex_lock(&vnode->validate_lock);
/* if the promise has expired, we need to check the server again to get
* a new promise - note that if the (parent) directory's metadata was
* changed then the security may be different and we may no longer have
* access */
if (!vnode->cb_promised ||
test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) {
_debug("not promised");
ret = afs_vnode_fetch_status(vnode, NULL, key);
if (ret < 0)
goto error_unlock;
_debug("new promise [fl=%lx]", vnode->flags);
}
if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) {
_debug("file already deleted");
ret = -ESTALE;
goto error_unlock;
}
/* if the vnode's data version number changed then its contents are
* different */
if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) {
_debug("zap data {%x:%d}", vnode->fid.vid, vnode->fid.vnode);
invalidate_remote_inode(&vnode->vfs_inode);
}
clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
mutex_unlock(&vnode->validate_lock);
valid:
_leave(" = 0");
return 0;
error_unlock:
mutex_unlock(&vnode->validate_lock);
_leave(" = %d", ret);
return ret;
}
/*
* read the attributes of an inode
*/
@ -207,9 +301,10 @@ void afs_clear_inode(struct inode *inode)
vnode = AFS_FS_I(inode);
_enter("ino=%lu { vn=%08x v=%u x=%u t=%u }",
inode->i_ino,
_enter("{%x:%d.%d} v=%u x=%u t=%u }",
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
vnode->cb_version,
vnode->cb_expiry,
vnode->cb_type);

54
fs/afs/internal.h
View File

@ -80,6 +80,7 @@ struct afs_call {
void *reply; /* reply buffer (first part) */
void *reply2; /* reply buffer (second part) */
void *reply3; /* reply buffer (third part) */
void *reply4; /* reply buffer (fourth part) */
enum { /* call state */
AFS_CALL_REQUESTING, /* request is being sent for outgoing call */
AFS_CALL_AWAIT_REPLY, /* awaiting reply to outgoing call */
@ -300,19 +301,18 @@ struct afs_vnode {
#endif
struct afs_permits *permits; /* cache of permits so far obtained */
struct mutex permits_lock; /* lock for altering permits list */
struct mutex validate_lock; /* lock for validating this vnode */
wait_queue_head_t update_waitq; /* status fetch waitqueue */
unsigned update_cnt; /* number of outstanding ops that will update the
int update_cnt; /* number of outstanding ops that will update the
* status */
spinlock_t lock; /* waitqueue/flags lock */
unsigned long flags;
#define AFS_VNODE_CB_BROKEN 0 /* set if vnode's callback was broken */
#define AFS_VNODE_CHANGED 1 /* set if vnode's metadata changed */
#define AFS_VNODE_UNSET 1 /* set if vnode attributes not yet set */
#define AFS_VNODE_MODIFIED 2 /* set if vnode's data modified */
#define AFS_VNODE_ZAP_DATA 3 /* set if vnode's data should be invalidated */
#define AFS_VNODE_DELETED 4 /* set if vnode deleted on server */
#define AFS_VNODE_MOUNTPOINT 5 /* set if vnode is a mountpoint symlink */
#define AFS_VNODE_DIR_CHANGED 6 /* set if vnode's parent dir metadata changed */
#define AFS_VNODE_DIR_MODIFIED 7 /* set if vnode's parent dir data modified */
long acl_order; /* ACL check count (callback break count) */
@ -320,7 +320,6 @@ struct afs_vnode {
struct rb_node server_rb; /* link in server->fs_vnodes */
struct rb_node cb_promise; /* link in server->cb_promises */
struct work_struct cb_broken_work; /* work to be done on callback break */
struct mutex cb_broken_lock; /* lock against multiple attempts to fix break */
time_t cb_expires; /* time at which callback expires */
time_t cb_expires_at; /* time used to order cb_promise */
unsigned cb_version; /* callback version */
@ -388,6 +387,7 @@ extern void afs_init_callback_state(struct afs_server *);
extern void afs_broken_callback_work(struct work_struct *);
extern void afs_break_callbacks(struct afs_server *, size_t,
struct afs_callback[]);
extern void afs_discard_callback_on_delete(struct afs_vnode *);
extern void afs_give_up_callback(struct afs_vnode *);
extern void afs_dispatch_give_up_callbacks(struct work_struct *);
extern void afs_flush_callback_breaks(struct afs_server *);
@ -448,14 +448,34 @@ extern int afs_fs_give_up_callbacks(struct afs_server *,
const struct afs_wait_mode *);
extern int afs_fs_fetch_data(struct afs_server *, struct key *,
struct afs_vnode *, off_t, size_t, struct page *,
struct afs_volsync *,
const struct afs_wait_mode *);
extern int afs_fs_create(struct afs_server *, struct key *,
struct afs_vnode *, const char *, umode_t,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *,
const struct afs_wait_mode *);
extern int afs_fs_remove(struct afs_server *, struct key *,
struct afs_vnode *, const char *, bool,
const struct afs_wait_mode *);
extern int afs_fs_link(struct afs_server *, struct key *, struct afs_vnode *,
struct afs_vnode *, const char *,
const struct afs_wait_mode *);
extern int afs_fs_symlink(struct afs_server *, struct key *,
struct afs_vnode *, const char *, const char *,
struct afs_fid *, struct afs_file_status *,
const struct afs_wait_mode *);
extern int afs_fs_rename(struct afs_server *, struct key *,
struct afs_vnode *, const char *,
struct afs_vnode *, const char *,
const struct afs_wait_mode *);
/*
* inode.c
*/
extern struct inode *afs_iget(struct super_block *, struct key *,
struct afs_fid *);
struct afs_fid *, struct afs_file_status *,
struct afs_callback *);
extern int afs_validate(struct afs_vnode *, struct key *);
extern int afs_inode_getattr(struct vfsmount *, struct dentry *,
struct kstat *);
extern void afs_zap_permits(struct rcu_head *);
@ -522,7 +542,11 @@ extern int afs_permission(struct inode *, int, struct nameidata *);
*/
extern spinlock_t afs_server_peer_lock;
#define afs_get_server(S) do { atomic_inc(&(S)->usage); } while(0)
#define afs_get_server(S) \
do { \
_debug("GET SERVER %d", atomic_read(&(S)->usage)); \
atomic_inc(&(S)->usage); \
} while(0)
extern struct afs_server *afs_lookup_server(struct afs_cell *,
const struct in_addr *);
@ -588,10 +612,24 @@ static inline struct inode *AFS_VNODE_TO_I(struct afs_vnode *vnode)
return &vnode->vfs_inode;
}
extern void afs_vnode_finalise_status_update(struct afs_vnode *,
struct afs_server *);
extern int afs_vnode_fetch_status(struct afs_vnode *, struct afs_vnode *,
struct key *);
extern int afs_vnode_fetch_data(struct afs_vnode *, struct key *,
off_t, size_t, struct page *);
extern int afs_vnode_create(struct afs_vnode *, struct key *, const char *,
umode_t, struct afs_fid *, struct afs_file_status *,
struct afs_callback *, struct afs_server **);
extern int afs_vnode_remove(struct afs_vnode *, struct key *, const char *,
bool);
extern int afs_vnode_link(struct afs_vnode *, struct afs_vnode *, struct key *,
const char *);
extern int afs_vnode_symlink(struct afs_vnode *, struct key *, const char *,
const char *, struct afs_fid *,
struct afs_file_status *, struct afs_server **);
extern int afs_vnode_rename(struct afs_vnode *, struct afs_vnode *,
struct key *, const char *, const char *);
/*
* volume.c

21
fs/afs/misc.c
View File

@ -22,6 +22,7 @@ int afs_abort_to_error(u32 abort_code)
{
switch (abort_code) {
case 13: return -EACCES;
case 30: return -EROFS;
case VSALVAGE: return -EIO;
case VNOVNODE: return -ENOENT;
case VNOVOL: return -ENOMEDIUM;
@ -33,6 +34,24 @@ int afs_abort_to_error(u32 abort_code)
case VOVERQUOTA: return -EDQUOT;
case VBUSY: return -EBUSY;
case VMOVED: return -ENXIO;
default: return -EIO;
case 0x2f6df0c: return -EACCES;
case 0x2f6df0f: return -EBUSY;
case 0x2f6df10: return -EEXIST;
case 0x2f6df11: return -EXDEV;
case 0x2f6df13: return -ENOTDIR;
case 0x2f6df14: return -EISDIR;
case 0x2f6df15: return -EINVAL;
case 0x2f6df1a: return -EFBIG;
case 0x2f6df1b: return -ENOSPC;
case 0x2f6df1d: return -EROFS;
case 0x2f6df1e: return -EMLINK;
case 0x2f6df20: return -EDOM;
case 0x2f6df21: return -ERANGE;
case 0x2f6df22: return -EDEADLK;
case 0x2f6df23: return -ENAMETOOLONG;
case 0x2f6df24: return -ENOLCK;
case 0x2f6df26: return -ENOTEMPTY;
case 0x2f6df78: return -EDQUOT;
default: return -EREMOTEIO;
}
}

31
fs/afs/security.c
View File

@ -92,7 +92,7 @@ static struct afs_vnode *afs_get_auth_inode(struct afs_vnode *vnode,
ASSERT(auth_inode != NULL);
} else {
auth_inode = afs_iget(vnode->vfs_inode.i_sb, key,
&vnode->status.parent);
&vnode->status.parent, NULL, NULL);
if (IS_ERR(auth_inode))
return ERR_PTR(PTR_ERR(auth_inode));
}
@ -288,7 +288,8 @@ int afs_permission(struct inode *inode, int mask, struct nameidata *nd)
struct key *key;
int ret;
_enter("{%x:%x},%x,", vnode->fid.vid, vnode->fid.vnode, mask);
_enter("{{%x:%x},%lx},%x,",
vnode->fid.vid, vnode->fid.vnode, vnode->flags, mask);
key = afs_request_key(vnode->volume->cell);
if (IS_ERR(key)) {
@ -296,13 +297,19 @@ int afs_permission(struct inode *inode, int mask, struct nameidata *nd)
return PTR_ERR(key);
}
/* if the promise has expired, we need to check the server again */
if (!vnode->cb_promised) {
_debug("not promised");
ret = afs_vnode_fetch_status(vnode, NULL, key);
if (ret < 0)
goto error;
_debug("new promise [fl=%lx]", vnode->flags);
}
/* check the permits to see if we've got one yet */
ret = afs_check_permit(vnode, key, &access);
if (ret < 0) {
key_put(key);
_leave(" = %d [check]", ret);
return ret;
}
if (ret < 0)
goto error;
/* interpret the access mask */
_debug("REQ %x ACC %x on %s",
@ -336,10 +343,14 @@ int afs_permission(struct inode *inode, int mask, struct nameidata *nd)
}
key_put(key);
return generic_permission(inode, mask, NULL);
ret = generic_permission(inode, mask, NULL);
_leave(" = %d", ret);
return ret;
permission_denied:
ret = -EACCES;
error:
key_put(key);
_leave(" = -EACCES");
return -EACCES;
_leave(" = %d", ret);
return ret;
}

2
fs/afs/server.c
View File

@ -223,6 +223,8 @@ void afs_put_server(struct afs_server *server)
_enter("%p{%d}", server, atomic_read(&server->usage));
_debug("PUT SERVER %d", atomic_read(&server->usage));
ASSERTCMP(atomic_read(&server->usage), >, 0);
if (likely(!atomic_dec_and_test(&server->usage))) {

6
fs/afs/super.c
View File

@ -331,7 +331,7 @@ static int afs_fill_super(struct super_block *sb, void *data)
fid.vid = as->volume->vid;
fid.vnode = 1;
fid.unique = 1;
inode = afs_iget(sb, params->key, &fid);
inode = afs_iget(sb, params->key, &fid, NULL, NULL);
if (IS_ERR(inode))
goto error_inode;
@ -473,9 +473,9 @@ static void afs_i_init_once(void *_vnode, struct kmem_cache *cachep,
inode_init_once(&vnode->vfs_inode);
init_waitqueue_head(&vnode->update_waitq);
mutex_init(&vnode->permits_lock);
mutex_init(&vnode->validate_lock);
spin_lock_init(&vnode->lock);
INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work);
mutex_init(&vnode->cb_broken_lock);
}
}
@ -497,7 +497,7 @@ static struct inode *afs_alloc_inode(struct super_block *sb)
vnode->volume = NULL;
vnode->update_cnt = 0;
vnode->flags = 0;
vnode->flags = 1 << AFS_VNODE_UNSET;
vnode->cb_promised = false;
return &vnode->vfs_inode;

422
fs/afs/vnode.c
View File

@ -30,7 +30,7 @@ static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent,
bad = dump_tree_aux(node->rb_left, node, depth + 2, '/');
vnode = rb_entry(node, struct afs_vnode, cb_promise);
kdebug("%c %*.*s%c%p {%d}",
_debug("%c %*.*s%c%p {%d}",
rb_is_red(node) ? 'R' : 'B',
depth, depth, "", lr,
vnode, vnode->cb_expires_at);
@ -47,7 +47,7 @@ static noinline bool dump_tree_aux(struct rb_node *node, struct rb_node *parent,
static noinline void dump_tree(const char *name, struct afs_server *server)
{
kenter("%s", name);
_enter("%s", name);
if (dump_tree_aux(server->cb_promises.rb_node, NULL, 0, '-'))
BUG();
}
@ -187,47 +187,61 @@ static void afs_vnode_deleted_remotely(struct afs_vnode *vnode)
spin_unlock(&server->cb_lock);
}
spin_lock(&vnode->server->fs_lock);
rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes);
spin_unlock(&vnode->server->fs_lock);
vnode->server = NULL;
afs_put_server(server);
}
/*
* finish off updating the recorded status of a file
* finish off updating the recorded status of a file after a successful
* operation completion
* - starts callback expiry timer
* - adds to server's callback list
*/
static void afs_vnode_finalise_status_update(struct afs_vnode *vnode,
struct afs_server *server,
int ret)
void afs_vnode_finalise_status_update(struct afs_vnode *vnode,
struct afs_server *server)
{
struct afs_server *oldserver = NULL;
_enter("%p,%p,%d", vnode, server, ret);
_enter("%p,%p", vnode, server);
spin_lock(&vnode->lock);
clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
afs_vnode_note_promise(vnode, server);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
wake_up_all(&vnode->update_waitq);
afs_put_server(oldserver);
_leave("");
}
/*
* finish off updating the recorded status of a file after an operation failed
*/
static void afs_vnode_status_update_failed(struct afs_vnode *vnode, int ret)
{
_enter("%p,%d", vnode, ret);
spin_lock(&vnode->lock);
clear_bit(AFS_VNODE_CB_BROKEN, &vnode->flags);
switch (ret) {
case 0:
afs_vnode_note_promise(vnode, server);
break;
case -ENOENT:
if (ret == -ENOENT) {
/* the file was deleted on the server */
_debug("got NOENT from server - marking file deleted");
afs_vnode_deleted_remotely(vnode);
break;
default:
break;
}
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
wake_up_all(&vnode->update_waitq);
afs_put_server(oldserver);
_leave("");
}
@ -275,8 +289,12 @@ int afs_vnode_fetch_status(struct afs_vnode *vnode,
return 0;
}
ASSERTCMP(vnode->update_cnt, >=, 0);
if (vnode->update_cnt > 0) {
/* someone else started a fetch */
_debug("wait on fetch %d", vnode->update_cnt);
set_current_state(TASK_UNINTERRUPTIBLE);
ASSERT(myself.func != NULL);
add_wait_queue(&vnode->update_waitq, &myself);
@ -325,7 +343,7 @@ get_anyway:
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
return PTR_ERR(server);
goto no_server;
_debug("USING SERVER: %p{%08x}",
server, ntohl(server->addr.s_addr));
@ -336,17 +354,34 @@ get_anyway:
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0 && auth_vnode)
afs_cache_permit(vnode, key, acl_order);
afs_vnode_finalise_status_update(vnode, server, ret);
if (ret == 0) {
_debug("adjust");
if (auth_vnode)
afs_cache_permit(vnode, key, acl_order);
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
_debug("failed [%d]", ret);
afs_vnode_status_update_failed(vnode, ret);
}
_leave(" = %d", ret);
ASSERTCMP(vnode->update_cnt, >=, 0);
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* fetch file data from the volume
* - TODO implement caching and server failover
* - TODO implement caching
*/
int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key,
off_t offset, size_t length, struct page *page)
@ -372,18 +407,349 @@ int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key,
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
return PTR_ERR(server);
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_fetch_data(server, key, vnode, offset, length,
page, NULL, &afs_sync_call);
page, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
afs_vnode_finalise_status_update(vnode, server, ret);
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
}
_leave(" = %d", ret);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
return PTR_ERR(server);
}
/*
* make a file or a directory
*/
int afs_vnode_create(struct afs_vnode *vnode, struct key *key,
const char *name, umode_t mode, struct afs_fid *newfid,
struct afs_file_status *newstatus,
struct afs_callback *newcb, struct afs_server **_server)
{
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%x,%s,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name);
/* this op will fetch the status on the directory we're creating in */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_create(server, key, vnode, name, mode, newfid,
newstatus, newcb, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
*_server = server;
} else {
afs_vnode_status_update_failed(vnode, ret);
*_server = NULL;
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* remove a file or directory
*/
int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name,
bool isdir)
{
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%x,%s",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name);
/* this op will fetch the status on the directory we're removing from */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_remove(server, key, vnode, name, isdir,
&afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* create a hard link
*/
extern int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode,
struct key *key, const char *name)
{
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%s{%u,%u,%u},%x,%s",
dvnode->volume->vlocation->vldb.name,
dvnode->fid.vid,
dvnode->fid.vnode,
dvnode->fid.unique,
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name);
/* this op will fetch the status on the directory we're removing from */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
spin_lock(&dvnode->lock);
dvnode->update_cnt++;
spin_unlock(&dvnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(dvnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_link(server, key, dvnode, vnode, name,
&afs_sync_call);
} while (!afs_volume_release_fileserver(dvnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
afs_vnode_finalise_status_update(dvnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(vnode, ret);
afs_vnode_status_update_failed(dvnode, ret);
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
spin_lock(&dvnode->lock);
dvnode->update_cnt--;
ASSERTCMP(dvnode->update_cnt, >=, 0);
spin_unlock(&dvnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* create a symbolic link
*/
int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key,
const char *name, const char *content,
struct afs_fid *newfid,
struct afs_file_status *newstatus,
struct afs_server **_server)
{
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%x,%s,%s,,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,
key_serial(key),
name, content);
/* this op will fetch the status on the directory we're creating in */
spin_lock(&vnode->lock);
vnode->update_cnt++;
spin_unlock(&vnode->lock);
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(vnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_symlink(server, key, vnode, name, content,
newfid, newstatus, &afs_sync_call);
} while (!afs_volume_release_fileserver(vnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(vnode, server);
*_server = server;
} else {
afs_vnode_status_update_failed(vnode, ret);
*_server = NULL;
}
_leave(" = %d [cnt %d]", ret, vnode->update_cnt);
return ret;
no_server:
spin_lock(&vnode->lock);
vnode->update_cnt--;
ASSERTCMP(vnode->update_cnt, >=, 0);
spin_unlock(&vnode->lock);
_leave(" = %ld [cnt %d]", PTR_ERR(server), vnode->update_cnt);
return PTR_ERR(server);
}
/*
* rename a file
*/
int afs_vnode_rename(struct afs_vnode *orig_dvnode,
struct afs_vnode *new_dvnode,
struct key *key,
const char *orig_name,
const char *new_name)
{
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%s{%u,%u,%u},%x,%s,%s",
orig_dvnode->volume->vlocation->vldb.name,
orig_dvnode->fid.vid,
orig_dvnode->fid.vnode,
orig_dvnode->fid.unique,
new_dvnode->volume->vlocation->vldb.name,
new_dvnode->fid.vid,
new_dvnode->fid.vnode,
new_dvnode->fid.unique,
key_serial(key),
orig_name,
new_name);
/* this op will fetch the status on both the directories we're dealing
* with */
spin_lock(&orig_dvnode->lock);
orig_dvnode->update_cnt++;
spin_unlock(&orig_dvnode->lock);
if (new_dvnode != orig_dvnode) {
spin_lock(&new_dvnode->lock);
new_dvnode->update_cnt++;
spin_unlock(&new_dvnode->lock);
}
do {
/* pick a server to query */
server = afs_volume_pick_fileserver(orig_dvnode);
if (IS_ERR(server))
goto no_server;
_debug("USING SERVER: %08x\n", ntohl(server->addr.s_addr));
ret = afs_fs_rename(server, key, orig_dvnode, orig_name,
new_dvnode, new_name, &afs_sync_call);
} while (!afs_volume_release_fileserver(orig_dvnode, server, ret));
/* adjust the flags */
if (ret == 0) {
afs_vnode_finalise_status_update(orig_dvnode, server);
if (new_dvnode != orig_dvnode)
afs_vnode_finalise_status_update(new_dvnode, server);
afs_put_server(server);
} else {
afs_vnode_status_update_failed(orig_dvnode, ret);
if (new_dvnode != orig_dvnode)
afs_vnode_status_update_failed(new_dvnode, ret);
}
_leave(" = %d [cnt %d]", ret, orig_dvnode->update_cnt);
return ret;
no_server:
spin_lock(&orig_dvnode->lock);
orig_dvnode->update_cnt--;
ASSERTCMP(orig_dvnode->update_cnt, >=, 0);
spin_unlock(&orig_dvnode->lock);
if (new_dvnode != orig_dvnode) {
spin_lock(&new_dvnode->lock);
new_dvnode->update_cnt--;
ASSERTCMP(new_dvnode->update_cnt, >=, 0);
spin_unlock(&new_dvnode->lock);
}
_leave(" = %ld [cnt %d]", PTR_ERR(server), orig_dvnode->update_cnt);
return PTR_ERR(server);
}

14
fs/afs/volume.c
View File

@ -295,6 +295,7 @@ struct afs_server *afs_volume_pick_fileserver(struct afs_vnode *vnode)
* - releases the ref on the server struct that was acquired by picking
* - records result of using a particular server to access a volume
* - return 0 to try again, 1 if okay or to issue error
* - the caller must release the server struct if result was 0
*/
int afs_volume_release_fileserver(struct afs_vnode *vnode,
struct afs_server *server,
@ -312,7 +313,8 @@ int afs_volume_release_fileserver(struct afs_vnode *vnode,
case 0:
server->fs_act_jif = jiffies;
server->fs_state = 0;
break;
_leave("");
return 1;
/* the fileserver denied all knowledge of the volume */
case -ENOMEDIUM:
@ -377,14 +379,12 @@ int afs_volume_release_fileserver(struct afs_vnode *vnode,
server->fs_act_jif = jiffies;
case -ENOMEM:
case -ENONET:
break;
/* tell the caller to accept the result */
afs_put_server(server);
_leave(" [local failure]");
return 1;
}
/* tell the caller to accept the result */
afs_put_server(server);
_leave("");
return 1;
/* tell the caller to loop around and try the next server */
try_next_server_upw:
up_write(&volume->server_sem);