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ceph: simplify ceph_buffer interface

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We never allocate the ceph_buffer and buffer separtely, so use a single
constructor.

Disallow put on NULL buffer; make the caller check.

Signed-off-by: Sage Weil <sage@newdream.net>
This commit is contained in:
Sage Weil 2009-12-07 12:17:17 -08:00
parent dd26d857a7
commit b6c1d5b81e
5 changed files with 35 additions and 29 deletions
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23
fs/ceph/buffer.c
View File

@ -2,23 +2,38 @@
#include "ceph_debug.h"
#include "buffer.h"
struct ceph_buffer *ceph_buffer_new(gfp_t gfp)
struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp)
{
struct ceph_buffer *b;
b = kmalloc(sizeof(*b), gfp);
if (!b)
return NULL;
b->vec.iov_base = kmalloc(len, gfp | __GFP_NOWARN);
if (b->vec.iov_base) {
b->is_vmalloc = false;
} else {
b->vec.iov_base = __vmalloc(len, gfp, PAGE_KERNEL);
if (!b->vec.iov_base) {
kfree(b);
return NULL;
}
b->is_vmalloc = true;
}
kref_init(&b->kref);
b->vec.iov_base = NULL;
b->vec.iov_len = 0;
b->alloc_len = 0;
b->alloc_len = len;
b->vec.iov_len = len;
dout("buffer_new %p\n", b);
return b;
}
void ceph_buffer_release(struct kref *kref)
{
struct ceph_buffer *b = container_of(kref, struct ceph_buffer, kref);
dout("buffer_release %p\n", b);
if (b->vec.iov_base) {
if (b->is_vmalloc)
vfree(b->vec.iov_base);

18
fs/ceph/buffer.h
View File

@ -20,8 +20,8 @@ struct ceph_buffer {
bool is_vmalloc;
};
struct ceph_buffer *ceph_buffer_new(gfp_t gfp);
int ceph_buffer_alloc(struct ceph_buffer *b, int len, gfp_t gfp);
extern struct ceph_buffer *ceph_buffer_new(size_t len, gfp_t gfp);
extern void ceph_buffer_release(struct kref *kref);
static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
{
@ -29,23 +29,9 @@ static inline struct ceph_buffer *ceph_buffer_get(struct ceph_buffer *b)
return b;
}
void ceph_buffer_release(struct kref *kref);
static inline void ceph_buffer_put(struct ceph_buffer *b)
{
if (b)
kref_put(&b->kref, ceph_buffer_release);
}
static inline struct ceph_buffer *ceph_buffer_new_alloc(int len, gfp_t gfp)
{
struct ceph_buffer *b = ceph_buffer_new(gfp);
if (b && ceph_buffer_alloc(b, len, gfp) < 0) {
ceph_buffer_put(b);
b = NULL;
}
return b;
}
#endif

5
fs/ceph/inode.c
View File

@ -383,7 +383,9 @@ void ceph_destroy_inode(struct inode *inode)
}
__ceph_destroy_xattrs(ci);
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
kmem_cache_free(ceph_inode_cachep, ci);
@ -526,7 +528,7 @@ static int fill_inode(struct inode *inode,
* bytes are the xattr count).
*/
if (iinfo->xattr_len > 4) {
xattr_blob = ceph_buffer_new_alloc(iinfo->xattr_len, GFP_NOFS);
xattr_blob = ceph_buffer_new(iinfo->xattr_len, GFP_NOFS);
if (!xattr_blob)
pr_err("fill_inode ENOMEM xattr blob %d bytes\n",
iinfo->xattr_len);
@ -715,6 +717,7 @@ no_change:
err = 0;
out:
if (xattr_blob)
ceph_buffer_put(xattr_blob);
return err;
}

2
fs/ceph/messenger.c
View File

@ -2047,7 +2047,7 @@ int ceph_alloc_middle(struct ceph_connection *con, struct ceph_msg *msg)
BUG_ON(!middle_len);
BUG_ON(msg->middle);
msg->middle = ceph_buffer_new_alloc(middle_len, GFP_NOFS);
msg->middle = ceph_buffer_new(middle_len, GFP_NOFS);
if (!msg->middle)
return -ENOMEM;
return 0;

4
fs/ceph/xattr.c
View File

@ -482,6 +482,7 @@ void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
ci->i_xattrs.prealloc_blob->vec.iov_len =
dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
if (ci->i_xattrs.blob)
ceph_buffer_put(ci->i_xattrs.blob);
ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
ci->i_xattrs.prealloc_blob = NULL;
@ -745,10 +746,11 @@ retry:
spin_unlock(&inode->i_lock);
dout(" preaallocating new blob size=%d\n", required_blob_size);
blob = ceph_buffer_new_alloc(required_blob_size, GFP_NOFS);
blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
if (!blob)
goto out;
spin_lock(&inode->i_lock);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
ci->i_xattrs.prealloc_blob = blob;
goto retry;