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AFS: AFS fixups 

Make some miscellaneous changes to the AFS filesystem:

 (1) Assert RCU barriers on module exit to make sure RCU has finished with
     callbacks in this module.

 (2) Correctly handle the AFS server returning a zero-length read.

 (3) Split out data zapping calls into one function (afs_zap_data).

 (4) Rename some afs_file_*() functions to afs_*() where they apply to
     non-regular files too.

 (5) Be consistent about the presentation of volume ID:vnode ID in debugging
     output.

Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
David Howells 2007-05-09 02:33:45 -07:00 committed by Linus Torvalds
parent ef71c15c46
commit 416351f28d
12 changed files with 121 additions and 109 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
fs/afs/callback.c
View File

@ -44,7 +44,7 @@ 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);
_debug("UNPROMISE { vid=%x vn=%u uq=%u}",
_debug("UNPROMISE { vid=%x:%u uq=%u}",
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
rb_erase(&vnode->cb_promise, &server->cb_promises);
vnode->cb_promised = false;
@ -84,11 +84,8 @@ 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 {%x:%u}",
vnode->fid.vid, vnode->fid.vnode);
invalidate_remote_inode(&vnode->vfs_inode);
}
if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
afs_zap_data(vnode);
}
out:

18
fs/afs/dir.c
View File

@ -55,7 +55,7 @@ const struct inode_operations afs_dir_inode_operations = {
.rmdir = afs_rmdir,
.rename = afs_rename,
.permission = afs_permission,
.getattr = afs_inode_getattr,
.getattr = afs_getattr,
};
static struct dentry_operations afs_fs_dentry_operations = {
@ -491,7 +491,7 @@ static struct dentry *afs_lookup(struct inode *dir, struct dentry *dentry,
vnode = AFS_FS_I(dir);
_enter("{%x:%d},%p{%s},",
_enter("{%x:%u},%p{%s},",
vnode->fid.vid, vnode->fid.vnode, dentry, dentry->d_name.name);
ASSERTCMP(dentry->d_inode, ==, NULL);
@ -731,7 +731,7 @@ static int afs_mkdir(struct inode *dir, struct dentry *dentry, int mode)
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s},%o",
_enter("{%x:%u},{%s},%o",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
ret = -ENAMETOOLONG;
@ -796,7 +796,7 @@ static int afs_rmdir(struct inode *dir, struct dentry *dentry)
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s}",
_enter("{%x:%u},{%s}",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
ret = -ENAMETOOLONG;
@ -842,7 +842,7 @@ static int afs_unlink(struct inode *dir, struct dentry *dentry)
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s}",
_enter("{%x:%u},{%s}",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name);
ret = -ENAMETOOLONG;
@ -916,7 +916,7 @@ static int afs_create(struct inode *dir, struct dentry *dentry, int mode,
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s},%o,",
_enter("{%x:%u},{%s},%o,",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name, mode);
ret = -ENAMETOOLONG;
@ -983,7 +983,7 @@ static int afs_link(struct dentry *from, struct inode *dir,
vnode = AFS_FS_I(from->d_inode);
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%x:%d},{%s}",
_enter("{%x:%u},{%x:%u},{%s}",
vnode->fid.vid, vnode->fid.vnode,
dvnode->fid.vid, dvnode->fid.vnode,
dentry->d_name.name);
@ -1032,7 +1032,7 @@ static int afs_symlink(struct inode *dir, struct dentry *dentry,
dvnode = AFS_FS_I(dir);
_enter("{%x:%d},{%s},%s",
_enter("{%x:%u},{%s},%s",
dvnode->fid.vid, dvnode->fid.vnode, dentry->d_name.name,
content);
@ -1104,7 +1104,7 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
orig_dvnode = AFS_FS_I(old_dir);
new_dvnode = AFS_FS_I(new_dir);
_enter("{%x:%d},{%x:%d},{%x:%d},{%s}",
_enter("{%x:%u},{%x:%u},{%x:%u},{%s}",
orig_dvnode->fid.vid, orig_dvnode->fid.vnode,
vnode->fid.vid, vnode->fid.vnode,
new_dvnode->fid.vid, new_dvnode->fid.vnode,

75
fs/afs/file.c
View File

@ -17,9 +17,9 @@
#include <linux/pagemap.h>
#include "internal.h"
static int afs_file_readpage(struct file *file, struct page *page);
static void afs_file_invalidatepage(struct page *page, unsigned long offset);
static int afs_file_releasepage(struct page *page, gfp_t gfp_flags);
static int afs_readpage(struct file *file, struct page *page);
static void afs_invalidatepage(struct page *page, unsigned long offset);
static int afs_releasepage(struct page *page, gfp_t gfp_flags);
const struct file_operations afs_file_operations = {
.open = afs_open,
@ -32,15 +32,15 @@ const struct file_operations afs_file_operations = {
};
const struct inode_operations afs_file_inode_operations = {
.getattr = afs_inode_getattr,
.getattr = afs_getattr,
.permission = afs_permission,
};
const struct address_space_operations afs_fs_aops = {
.readpage = afs_file_readpage,
.readpage = afs_readpage,
.set_page_dirty = __set_page_dirty_nobuffers,
.releasepage = afs_file_releasepage,
.invalidatepage = afs_file_invalidatepage,
.releasepage = afs_releasepage,
.invalidatepage = afs_invalidatepage,
};
/*
@ -52,7 +52,7 @@ int afs_open(struct inode *inode, struct file *file)
struct key *key;
int ret;
_enter("{%x:%x},", vnode->fid.vid, vnode->fid.vnode);
_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);
key = afs_request_key(vnode->volume->cell);
if (IS_ERR(key)) {
@ -78,7 +78,7 @@ int afs_release(struct inode *inode, struct file *file)
{
struct afs_vnode *vnode = AFS_FS_I(inode);
_enter("{%x:%x},", vnode->fid.vid, vnode->fid.vnode);
_enter("{%x:%u},", vnode->fid.vid, vnode->fid.vnode);
key_put(file->private_data);
_leave(" = 0");
@ -89,10 +89,10 @@ int afs_release(struct inode *inode, struct file *file)
* deal with notification that a page was read from the cache
*/
#ifdef AFS_CACHING_SUPPORT
static void afs_file_readpage_read_complete(void *cookie_data,
struct page *page,
void *data,
int error)
static void afs_readpage_read_complete(void *cookie_data,
struct page *page,
void *data,
int error)
{
_enter("%p,%p,%p,%d", cookie_data, page, data, error);
@ -109,10 +109,10 @@ static void afs_file_readpage_read_complete(void *cookie_data,
* deal with notification that a page was written to the cache
*/
#ifdef AFS_CACHING_SUPPORT
static void afs_file_readpage_write_complete(void *cookie_data,
struct page *page,
void *data,
int error)
static void afs_readpage_write_complete(void *cookie_data,
struct page *page,
void *data,
int error)
{
_enter("%p,%p,%p,%d", cookie_data, page, data, error);
@ -121,9 +121,9 @@ static void afs_file_readpage_write_complete(void *cookie_data,
#endif
/*
* AFS read page from file (or symlink)
* AFS read page from file, directory or symlink
*/
static int afs_file_readpage(struct file *file, struct page *page)
static int afs_readpage(struct file *file, struct page *page)
{
struct afs_vnode *vnode;
struct inode *inode;
@ -218,31 +218,14 @@ error:
return ret;
}
/*
* get a page cookie for the specified page
*/
#ifdef AFS_CACHING_SUPPORT
int afs_cache_get_page_cookie(struct page *page,
struct cachefs_page **_page_cookie)
{
int ret;
_enter("");
ret = cachefs_page_get_private(page,_page_cookie, GFP_NOIO);
_leave(" = %d", ret);
return ret;
}
#endif
/*
* invalidate part or all of a page
*/
static void afs_file_invalidatepage(struct page *page, unsigned long offset)
static void afs_invalidatepage(struct page *page, unsigned long offset)
{
int ret = 1;
_enter("{%lu},%lu", page->index, offset);
kenter("{%lu},%lu", page->index, offset);
BUG_ON(!PageLocked(page));
@ -274,23 +257,17 @@ static void afs_file_invalidatepage(struct page *page, unsigned long offset)
/*
* release a page and cleanup its private data
*/
static int afs_file_releasepage(struct page *page, gfp_t gfp_flags)
static int afs_releasepage(struct page *page, gfp_t gfp_flags)
{
struct cachefs_page *pageio;
struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
_enter("{%lu},%x", page->index, gfp_flags);
_enter("{{%x:%u}[%lu],%lx},%x",
vnode->fid.vid, vnode->fid.vnode, page->index, page->flags,
gfp_flags);
if (PagePrivate(page)) {
#ifdef AFS_CACHING_SUPPORT
struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
cachefs_uncache_page(vnode->cache, page);
#endif
pageio = (struct cachefs_page *) page_private(page);
set_page_private(page, 0);
ClearPagePrivate(page);
kfree(pageio);
}
_leave(" = 0");

37
fs/afs/fsclient.c
View File

@ -206,7 +206,7 @@ int afs_fs_fetch_file_status(struct afs_server *server,
struct afs_call *call;
__be32 *bp;
_enter(",%x,{%x:%d},,",
_enter(",%x,{%x:%u},,",
key_serial(key), vnode->fid.vid, vnode->fid.vnode);
call = afs_alloc_flat_call(&afs_RXFSFetchStatus, 16, (21 + 3 + 6) * 4);
@ -265,25 +265,20 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
call->offset = 0;
call->unmarshall++;
if (call->count < PAGE_SIZE) {
page = call->reply3;
buffer = kmap_atomic(page, KM_USER0);
memset(buffer + PAGE_SIZE - call->count, 0,
call->count);
kunmap_atomic(buffer, KM_USER0);
}
/* extract the returned data */
case 2:
_debug("extract data");
page = call->reply3;
buffer = kmap_atomic(page, KM_USER0);
ret = afs_extract_data(call, skb, last, buffer, call->count);
kunmap_atomic(buffer, KM_USER0);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
if (call->count > 0) {
page = call->reply3;
buffer = kmap_atomic(page, KM_USER0);
ret = afs_extract_data(call, skb, last, buffer,
call->count);
kunmap_atomic(buffer, KM_USER0);
switch (ret) {
case 0: break;
case -EAGAIN: return 0;
default: return ret;
}
}
call->offset = 0;
@ -318,6 +313,14 @@ static int afs_deliver_fs_fetch_data(struct afs_call *call,
if (!last)
return 0;
if (call->count < PAGE_SIZE) {
_debug("clear");
page = call->reply3;
buffer = kmap_atomic(page, KM_USER0);
memset(buffer + call->count, 0, PAGE_SIZE - call->count);
kunmap_atomic(buffer, KM_USER0);
}
_leave(" = 0 [done]");
return 0;
}

25
fs/afs/inode.c
View File

@ -125,7 +125,7 @@ struct inode *afs_iget(struct super_block *sb, struct key *key,
struct inode *inode;
int ret;
_enter(",{%u,%u,%u},,", fid->vid, fid->vnode, fid->unique);
_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique);
as = sb->s_fs_info;
data.volume = as->volume;
@ -203,6 +203,19 @@ bad_inode:
return ERR_PTR(ret);
}
/*
* mark the data attached to an inode as obsolete due to a write on the server
* - might also want to ditch all the outstanding writes and dirty pages
*/
void afs_zap_data(struct afs_vnode *vnode)
{
kenter("zap data {%x:%u}", vnode->fid.vid, vnode->fid.vnode);
/* nuke all the non-dirty pages that aren't locked, mapped or being
* written back */
invalidate_remote_inode(&vnode->vfs_inode);
}
/*
* validate a vnode/inode
* - there are several things we need to check
@ -258,10 +271,8 @@ int afs_validate(struct afs_vnode *vnode, struct key *key)
/* 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);
}
if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags))
afs_zap_data(vnode);
clear_bit(AFS_VNODE_MODIFIED, &vnode->flags);
mutex_unlock(&vnode->validate_lock);
@ -278,7 +289,7 @@ error_unlock:
/*
* read the attributes of an inode
*/
int afs_inode_getattr(struct vfsmount *mnt, struct dentry *dentry,
int afs_getattr(struct vfsmount *mnt, struct dentry *dentry,
struct kstat *stat)
{
struct inode *inode;
@ -301,7 +312,7 @@ void afs_clear_inode(struct inode *inode)
vnode = AFS_FS_I(inode);
_enter("{%x:%d.%d} v=%u x=%u t=%u }",
_enter("{%x:%u.%d} v=%u x=%u t=%u }",
vnode->fid.vid,
vnode->fid.vnode,
vnode->fid.unique,

29
fs/afs/internal.h
View File

@ -433,10 +433,6 @@ extern const struct file_operations afs_file_operations;
extern int afs_open(struct inode *, struct file *);
extern int afs_release(struct inode *, struct file *);
#ifdef AFS_CACHING_SUPPORT
extern int afs_cache_get_page_cookie(struct page *, struct cachefs_page **);
#endif
/*
* fsclient.c
*/
@ -474,10 +470,9 @@ extern int afs_fs_rename(struct afs_server *, struct key *,
extern struct inode *afs_iget(struct super_block *, struct key *,
struct afs_fid *, struct afs_file_status *,
struct afs_callback *);
extern void afs_zap_data(struct afs_vnode *);
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 *);
extern int afs_getattr(struct vfsmount *, struct dentry *, struct kstat *);
extern void afs_clear_inode(struct inode *);
/*
@ -533,6 +528,7 @@ extern int afs_extract_data(struct afs_call *, struct sk_buff *, bool, void *,
*/
extern void afs_clear_permits(struct afs_vnode *);
extern void afs_cache_permit(struct afs_vnode *, struct key *, long);
extern void afs_zap_permits(struct rcu_head *);
extern struct key *afs_request_key(struct afs_cell *);
extern int afs_permission(struct inode *, int, struct nameidata *);
@ -726,6 +722,21 @@ do { \
} \
} while(0)
#define ASSERTRANGE(L, OP1, N, OP2, H) \
do { \
if (unlikely(!((L) OP1 (N)) || !((N) OP2 (H)))) { \
printk(KERN_ERR "\n"); \
printk(KERN_ERR "AFS: Assertion failed\n"); \
printk(KERN_ERR "%lu "#OP1" %lu "#OP2" %lu is false\n", \
(unsigned long)(L), (unsigned long)(N), \
(unsigned long)(H)); \
printk(KERN_ERR "0x%lx "#OP1" 0x%lx "#OP2" 0x%lx is false\n", \
(unsigned long)(L), (unsigned long)(N), \
(unsigned long)(H)); \
BUG(); \
} \
} while(0)
#define ASSERTIF(C, X) \
do { \
if (unlikely((C) && !(X))) { \
@ -758,6 +769,10 @@ do { \
do { \
} while(0)
#define ASSERTRANGE(L, OP1, N, OP2, H) \
do { \
} while(0)
#define ASSERTIF(C, X) \
do { \
} while(0)

2
fs/afs/main.c
View File

@ -149,6 +149,7 @@ error_cache:
afs_vlocation_purge();
afs_cell_purge();
afs_proc_cleanup();
rcu_barrier();
printk(KERN_ERR "kAFS: failed to register: %d\n", ret);
return ret;
}
@ -176,6 +177,7 @@ static void __exit afs_exit(void)
cachefs_unregister_netfs(&afs_cache_netfs);
#endif
afs_proc_cleanup();
rcu_barrier();
}
module_exit(afs_exit);

1
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 27: return -EFBIG;
case 30: return -EROFS;
case VSALVAGE: return -EIO;
case VNOVNODE: return -ENOENT;

5
fs/afs/mntpt.c
View File

@ -36,7 +36,7 @@ const struct inode_operations afs_mntpt_inode_operations = {
.lookup = afs_mntpt_lookup,
.follow_link = afs_mntpt_follow_link,
.readlink = page_readlink,
.getattr = afs_inode_getattr,
.getattr = afs_getattr,
};
static LIST_HEAD(afs_vfsmounts);
@ -58,7 +58,8 @@ int afs_mntpt_check_symlink(struct afs_vnode *vnode, struct key *key)
char *buf;
int ret;
_enter("{%u,%u}", vnode->fid.vnode, vnode->fid.unique);
_enter("{%x:%u,%u}",
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
/* read the contents of the symlink into the pagecache */
page = read_mapping_page(AFS_VNODE_TO_I(vnode)->i_mapping, 0, &file);

12
fs/afs/security.c
View File

@ -109,7 +109,7 @@ void afs_clear_permits(struct afs_vnode *vnode)
{
struct afs_permits *permits;
_enter("{%x}", vnode->fid.vnode);
_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode);
mutex_lock(&vnode->permits_lock);
permits = vnode->permits;
@ -132,7 +132,8 @@ void afs_cache_permit(struct afs_vnode *vnode, struct key *key, long acl_order)
struct afs_vnode *auth_vnode;
int count, loop;
_enter("{%x},%x,%lx", vnode->fid.vnode, key_serial(key), acl_order);
_enter("{%x:%u},%x,%lx",
vnode->fid.vid, vnode->fid.vnode, key_serial(key), acl_order);
auth_vnode = afs_get_auth_inode(vnode, key);
if (IS_ERR(auth_vnode)) {
@ -220,7 +221,8 @@ static int afs_check_permit(struct afs_vnode *vnode, struct key *key,
bool valid;
int loop, ret;
_enter("");
_enter("{%x:%u},%x",
vnode->fid.vid, vnode->fid.vnode, key_serial(key));
auth_vnode = afs_get_auth_inode(vnode, key);
if (IS_ERR(auth_vnode)) {
@ -268,9 +270,9 @@ static int afs_check_permit(struct afs_vnode *vnode, struct key *key,
_leave(" = %d", ret);
return ret;
}
*_access = vnode->status.caller_access;
}
*_access = vnode->status.caller_access;
iput(&auth_vnode->vfs_inode);
_leave(" = 0 [access %x]", *_access);
return 0;
@ -288,7 +290,7 @@ int afs_permission(struct inode *inode, int mask, struct nameidata *nd)
struct key *key;
int ret;
_enter("{{%x:%x},%lx},%x,",
_enter("{{%x:%u},%lx},%x,",
vnode->fid.vid, vnode->fid.vnode, vnode->flags, mask);
key = afs_request_key(vnode->volume->cell);

3
fs/afs/server.c
View File

@ -252,6 +252,9 @@ static void afs_destroy_server(struct afs_server *server)
{
_enter("%p", server);
ASSERTIF(server->cb_break_head != server->cb_break_tail,
delayed_work_pending(&server->cb_break_work));
ASSERTCMP(server->fs_vnodes.rb_node, ==, NULL);
ASSERTCMP(server->cb_promises.rb_node, ==, NULL);
ASSERTCMP(server->cb_break_head, ==, server->cb_break_tail);

14
fs/afs/vnode.c
View File

@ -261,7 +261,7 @@ int afs_vnode_fetch_status(struct afs_vnode *vnode,
DECLARE_WAITQUEUE(myself, current);
_enter("%s,{%u,%u,%u}",
_enter("%s,{%x:%u.%u}",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
@ -389,7 +389,7 @@ int afs_vnode_fetch_data(struct afs_vnode *vnode, struct key *key,
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%x,,,",
_enter("%s{%x:%u.%u},%x,,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
@ -446,7 +446,7 @@ int afs_vnode_create(struct afs_vnode *vnode, struct key *key,
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%x,%s,,",
_enter("%s{%x:%u.%u},%x,%s,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
@ -502,7 +502,7 @@ int afs_vnode_remove(struct afs_vnode *vnode, struct key *key, const char *name,
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%x,%s",
_enter("%s{%x:%u.%u},%x,%s",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
@ -557,7 +557,7 @@ extern int afs_vnode_link(struct afs_vnode *dvnode, struct afs_vnode *vnode,
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%s{%u,%u,%u},%x,%s",
_enter("%s{%x:%u.%u},%s{%x:%u.%u},%x,%s",
dvnode->volume->vlocation->vldb.name,
dvnode->fid.vid,
dvnode->fid.vnode,
@ -628,7 +628,7 @@ int afs_vnode_symlink(struct afs_vnode *vnode, struct key *key,
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%x,%s,%s,,,",
_enter("%s{%x:%u.%u},%x,%s,%s,,,",
vnode->volume->vlocation->vldb.name,
vnode->fid.vid,
vnode->fid.vnode,
@ -687,7 +687,7 @@ int afs_vnode_rename(struct afs_vnode *orig_dvnode,
struct afs_server *server;
int ret;
_enter("%s{%u,%u,%u},%s{%u,%u,%u},%x,%s,%s",
_enter("%s{%x:%u.%u},%s{%u,%u,%u},%x,%s,%s",
orig_dvnode->volume->vlocation->vldb.name,
orig_dvnode->fid.vid,
orig_dvnode->fid.vnode,