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| author | Jeff Layton <jlayton@redhat.com> | 2012-05-16 07:13:17 -0400 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2012-05-16 20:13:30 -0500 |
| commit | 6993f74a5bf836210e7f253d5ad3f76d73a95f51 (patch) | |
| tree | 6b0cf7d6aed03e9d7d0b705cf7ba79792ab062a2 | |
| parent | 8d5ce4d23c79e0f9861b19fc534f5b2dc636f79c (diff) | |
| download | linux-stable-6993f74a5bf836210e7f253d5ad3f76d73a95f51.tar.gz linux-stable-6993f74a5bf836210e7f253d5ad3f76d73a95f51.tar.bz2 linux-stable-6993f74a5bf836210e7f253d5ad3f76d73a95f51.zip | |
cifs: add refcounting to cifs_readdata structures
This isn't strictly necessary for the async readpages code, but the
uncached version will need to be able to collect the replies after
issuing the calls. Add a kref to cifs_readdata and use change the
code to take and put references appropriately.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
| -rw-r--r-- | fs/cifs/cifsproto.h | 2 | ||||
| -rw-r--r-- | fs/cifs/cifssmb.c | 3 | ||||
| -rw-r--r-- | fs/cifs/file.c | 21 |
3 files changed, 19 insertions, 7 deletions
diff --git a/fs/cifs/cifsproto.h b/fs/cifs/cifsproto.h index f309b43848fb..63e91c79564d 100644 --- a/fs/cifs/cifsproto.h +++ b/fs/cifs/cifsproto.h @@ -464,6 +464,7 @@ extern int SMBencrypt(unsigned char *passwd, const unsigned char *c8, /* asynchronous read support */ struct cifs_readdata { + struct kref refcount; struct cifsFileInfo *cfile; struct address_space *mapping; __u64 offset; @@ -478,6 +479,7 @@ struct cifs_readdata { struct kvec iov[1]; }; +void cifs_readdata_release(struct kref *refcount); int cifs_async_readv(struct cifs_readdata *rdata); /* asynchronous write support */ diff --git a/fs/cifs/cifssmb.c b/fs/cifs/cifssmb.c index 3aa1fcc15156..45633da461a8 100644 --- a/fs/cifs/cifssmb.c +++ b/fs/cifs/cifssmb.c @@ -1635,12 +1635,15 @@ cifs_async_readv(struct cifs_readdata *rdata) rdata->iov[0].iov_base = smb; rdata->iov[0].iov_len = be32_to_cpu(smb->hdr.smb_buf_length) + 4; + kref_get(&rdata->refcount); rc = cifs_call_async(tcon->ses->server, rdata->iov, 1, cifs_readv_receive, cifs_readv_callback, rdata, false); if (rc == 0) cifs_stats_inc(&tcon->num_reads); + else + kref_put(&rdata->refcount, cifs_readdata_release); cifs_small_buf_release(smb); return rc; diff --git a/fs/cifs/file.c b/fs/cifs/file.c index 183381d9c4c1..ae285e0cf67b 100644 --- a/fs/cifs/file.c +++ b/fs/cifs/file.c @@ -2347,16 +2347,22 @@ cifs_readdata_alloc(unsigned int nr_vecs, work_func_t complete) rdata = kzalloc(sizeof(*rdata) + sizeof(struct kvec) * nr_vecs, GFP_KERNEL); if (rdata != NULL) { + kref_init(&rdata->refcount); INIT_WORK(&rdata->work, complete); INIT_LIST_HEAD(&rdata->pages); } return rdata; } -static void -cifs_readdata_free(struct cifs_readdata *rdata) +void +cifs_readdata_release(struct kref *refcount) { - cifsFileInfo_put(rdata->cfile); + struct cifs_readdata *rdata = container_of(refcount, + struct cifs_readdata, refcount); + + if (rdata->cfile) + cifsFileInfo_put(rdata->cfile); + kfree(rdata); } @@ -2651,7 +2657,7 @@ cifs_readv_complete(struct work_struct *work) page_cache_release(page); } - cifs_readdata_free(rdata); + kref_put(&rdata->refcount, cifs_readdata_release); } static int @@ -2837,9 +2843,8 @@ static int cifs_readpages(struct file *file, struct address_space *mapping, } spin_lock(&cifs_file_list_lock); - cifsFileInfo_get(open_file); spin_unlock(&cifs_file_list_lock); - rdata->cfile = open_file; + rdata->cfile = cifsFileInfo_get(open_file); rdata->mapping = mapping; rdata->offset = offset; rdata->bytes = bytes; @@ -2864,9 +2869,11 @@ static int cifs_readpages(struct file *file, struct address_space *mapping, unlock_page(page); page_cache_release(page); } - cifs_readdata_free(rdata); + kref_put(&rdata->refcount, cifs_readdata_release); break; } + + kref_put(&rdata->refcount, cifs_readdata_release); } return rc; |