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authorDavid Howells <dhowells@redhat.com>2017-11-02 15:27:46 +0000
committerDavid Howells <dhowells@redhat.com>2017-11-13 15:38:16 +0000
commit49566f6f06b38d7c1a5c7eacc8a38c6ea2e36549 (patch)
treeafeb0ac3d5b11dab5681c302fa7cdd2be5d1e1dd /fs/afs
parent59fa1c4a9f528c2a1556f4b2cd4e055b560c1c0a (diff)
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afs: Note the cell in the superblock info also
Keep a reference to the cell in the superblock info structure in addition to the volume and net pointers. This will make it easier to clean up in a future patch in which afs_put_volume() will need the cell pointer. Whilst we're at it, make the cell and volume getting functions return a pointer to the object got to make the call sites look neater. Signed-off-by: David Howells <dhowells@redhat.com>
Diffstat (limited to 'fs/afs')
-rw-r--r--fs/afs/internal.h15
-rw-r--r--fs/afs/super.c57
2 files changed, 48 insertions, 24 deletions
diff --git a/fs/afs/internal.h b/fs/afs/internal.h
index bc9ded443b11..2d90cb7605f3 100644
--- a/fs/afs/internal.h
+++ b/fs/afs/internal.h
@@ -178,6 +178,7 @@ struct afs_writeback {
*/
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 */
char rwparent; /* T if parent is R/W AFS volume */
};
@@ -502,7 +503,12 @@ extern void afs_flush_callback_breaks(struct afs_server *);
/*
* cell.c
*/
-#define afs_get_cell(C) do { atomic_inc(&(C)->usage); } while(0)
+static inline struct afs_cell *afs_get_cell(struct afs_cell *cell)
+{
+ if (cell)
+ atomic_inc(&cell->usage);
+ return cell;
+}
extern int afs_cell_init(struct afs_net *, char *);
extern struct afs_cell *afs_cell_create(struct afs_net *, const char *, unsigned, char *, bool);
extern struct afs_cell *afs_cell_lookup(struct afs_net *, const char *, unsigned, bool);
@@ -789,7 +795,12 @@ extern int afs_vnode_release_lock(struct afs_vnode *, struct key *);
/*
* volume.c
*/
-#define afs_get_volume(V) do { atomic_inc(&(V)->usage); } while(0)
+static inline struct afs_volume *afs_get_volume(struct afs_volume *volume)
+{
+ if (volume)
+ atomic_inc(&volume->usage);
+ return volume;
+}
extern void afs_put_volume(struct afs_net *, struct afs_volume *);
extern struct afs_volume *afs_volume_lookup(struct afs_mount_params *);
diff --git a/fs/afs/super.c b/fs/afs/super.c
index d47a9bc46a69..e43f94ecc391 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -394,17 +394,38 @@ error:
return ret;
}
+static struct afs_super_info *afs_alloc_sbi(struct afs_mount_params *params)
+{
+ struct afs_super_info *as;
+
+ 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);
+ }
+ return as;
+}
+
+static void afs_destroy_sbi(struct afs_super_info *as)
+{
+ if (as) {
+ afs_put_volume(as->net, as->volume);
+ afs_put_cell(as->cell);
+ afs_put_net(as->net);
+ kfree(as);
+ }
+}
+
/*
* get an AFS superblock
*/
static struct dentry *afs_mount(struct file_system_type *fs_type,
- int flags, const char *dev_name, void *options)
+ int flags, const char *dev_name, void *options)
{
struct afs_mount_params params;
struct super_block *sb;
struct afs_volume *vol;
struct key *key;
- char *new_opts = kstrdup(options, GFP_KERNEL);
struct afs_super_info *as;
int ret;
@@ -437,20 +458,18 @@ static struct dentry *afs_mount(struct file_system_type *fs_type,
}
params.key = key;
+ /* allocate a superblock info record */
+ ret = -ENOMEM;
+ as = afs_alloc_sbi(&params);
+ if (!as)
+ goto error;
+
/* parse the device name */
vol = afs_volume_lookup(&params);
if (IS_ERR(vol)) {
ret = PTR_ERR(vol);
goto error;
}
-
- /* allocate a superblock info record */
- ret = -ENOMEM;
- as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
- if (!as)
- goto error_vol;
-
- as->net = afs_get_net(params.net);
as->volume = vol;
/* allocate a deviceless superblock */
@@ -466,31 +485,27 @@ static struct dentry *afs_mount(struct file_system_type *fs_type,
ret = afs_fill_super(sb, &params);
if (ret < 0)
goto error_sb;
+ as = NULL;
sb->s_flags |= MS_ACTIVE;
} else {
_debug("reuse");
ASSERTCMP(sb->s_flags, &, MS_ACTIVE);
- afs_put_volume(params.net, vol);
- kfree(as);
+ afs_destroy_sbi(as);
+ as = NULL;
}
afs_put_cell(params.cell);
- kfree(new_opts);
+ key_put(params.key);
_leave(" = 0 [%p]", sb);
return dget(sb->s_root);
error_sb:
deactivate_locked_super(sb);
- goto error;
error_as:
- afs_put_net(as->net);
- kfree(as);
-error_vol:
- afs_put_volume(params.net, vol);
+ afs_destroy_sbi(as);
error:
afs_put_cell(params.cell);
key_put(params.key);
- kfree(new_opts);
_leave(" = %d", ret);
return ERR_PTR(ret);
}
@@ -498,11 +513,9 @@ error:
static void afs_kill_super(struct super_block *sb)
{
struct afs_super_info *as = sb->s_fs_info;
- struct afs_net *net = as->net;
kill_anon_super(sb);
- afs_put_volume(net, as->volume);
- kfree(as);
+ afs_destroy_sbi(as);
}
/*