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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel…
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…/git/sage/ceph-client

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: handle partial result from get_user_pages
  ceph: mark user pages dirty on direct-io reads
  ceph: fix null pointer dereference in ceph_init_dentry for nfs reexport
  ceph: fix direct-io on non-page-aligned buffers
  ceph: fix msgr_init error path
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Linus Torvalds committed Dec 21, 2010
2 parents 453434c + 361cf40 commit 9d5004f
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Showing 5 changed files with 41 additions and 30 deletions.
3 changes: 2 additions & 1 deletion fs/ceph/dir.c
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Original file line number Diff line number Diff line change
Expand Up @@ -40,7 +40,8 @@ int ceph_init_dentry(struct dentry *dentry)
if (dentry->d_fsdata)
return 0;

if (ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
if (dentry->d_parent == NULL || /* nfs fh_to_dentry */
ceph_snap(dentry->d_parent->d_inode) == CEPH_NOSNAP)
dentry->d_op = &ceph_dentry_ops;
else if (ceph_snap(dentry->d_parent->d_inode) == CEPH_SNAPDIR)
dentry->d_op = &ceph_snapdir_dentry_ops;
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39 changes: 23 additions & 16 deletions fs/ceph/file.c
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Original file line number Diff line number Diff line change
Expand Up @@ -282,7 +282,8 @@ int ceph_release(struct inode *inode, struct file *file)
static int striped_read(struct inode *inode,
u64 off, u64 len,
struct page **pages, int num_pages,
int *checkeof, bool align_to_pages)
int *checkeof, bool align_to_pages,
unsigned long buf_align)
{
struct ceph_fs_client *fsc = ceph_inode_to_client(inode);
struct ceph_inode_info *ci = ceph_inode(inode);
Expand All @@ -307,7 +308,7 @@ static int striped_read(struct inode *inode,

more:
if (align_to_pages)
page_align = (pos - io_align) & ~PAGE_MASK;
page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
else
page_align = pos & ~PAGE_MASK;
this_len = left;
Expand Down Expand Up @@ -376,16 +377,18 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
struct inode *inode = file->f_dentry->d_inode;
struct page **pages;
u64 off = *poff;
int num_pages = calc_pages_for(off, len);
int ret;
int num_pages, ret;

dout("sync_read on file %p %llu~%u %s\n", file, off, len,
(file->f_flags & O_DIRECT) ? "O_DIRECT" : "");

if (file->f_flags & O_DIRECT)
pages = ceph_get_direct_page_vector(data, num_pages);
else
if (file->f_flags & O_DIRECT) {
num_pages = calc_pages_for((unsigned long)data, len);
pages = ceph_get_direct_page_vector(data, num_pages, true);
} else {
num_pages = calc_pages_for(off, len);
pages = ceph_alloc_page_vector(num_pages, GFP_NOFS);
}
if (IS_ERR(pages))
return PTR_ERR(pages);

Expand All @@ -400,7 +403,8 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,
goto done;

ret = striped_read(inode, off, len, pages, num_pages, checkeof,
file->f_flags & O_DIRECT);
file->f_flags & O_DIRECT,
(unsigned long)data & ~PAGE_MASK);

if (ret >= 0 && (file->f_flags & O_DIRECT) == 0)
ret = ceph_copy_page_vector_to_user(pages, data, off, ret);
Expand All @@ -409,7 +413,7 @@ static ssize_t ceph_sync_read(struct file *file, char __user *data,

done:
if (file->f_flags & O_DIRECT)
ceph_put_page_vector(pages, num_pages);
ceph_put_page_vector(pages, num_pages, true);
else
ceph_release_page_vector(pages, num_pages);
dout("sync_read result %d\n", ret);
Expand Down Expand Up @@ -456,6 +460,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
int do_sync = 0;
int check_caps = 0;
int page_align, io_align;
unsigned long buf_align;
int ret;
struct timespec mtime = CURRENT_TIME;

Expand All @@ -471,6 +476,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
pos = *offset;

io_align = pos & ~PAGE_MASK;
buf_align = (unsigned long)data & ~PAGE_MASK;

ret = filemap_write_and_wait_range(inode->i_mapping, pos, pos + left);
if (ret < 0)
Expand All @@ -496,12 +502,15 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
*/
more:
len = left;
if (file->f_flags & O_DIRECT)
if (file->f_flags & O_DIRECT) {
/* write from beginning of first page, regardless of
io alignment */
page_align = (pos - io_align) & ~PAGE_MASK;
else
page_align = (pos - io_align + buf_align) & ~PAGE_MASK;
num_pages = calc_pages_for((unsigned long)data, len);
} else {
page_align = pos & ~PAGE_MASK;
num_pages = calc_pages_for(pos, len);
}
req = ceph_osdc_new_request(&fsc->client->osdc, &ci->i_layout,
ceph_vino(inode), pos, &len,
CEPH_OSD_OP_WRITE, flags,
Expand All @@ -512,10 +521,8 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
if (!req)
return -ENOMEM;

num_pages = calc_pages_for(pos, len);

if (file->f_flags & O_DIRECT) {
pages = ceph_get_direct_page_vector(data, num_pages);
pages = ceph_get_direct_page_vector(data, num_pages, false);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto out;
Expand Down Expand Up @@ -565,7 +572,7 @@ static ssize_t ceph_sync_write(struct file *file, const char __user *data,
}

if (file->f_flags & O_DIRECT)
ceph_put_page_vector(pages, num_pages);
ceph_put_page_vector(pages, num_pages, false);
else if (file->f_flags & O_SYNC)
ceph_release_page_vector(pages, num_pages);

Expand Down
6 changes: 4 additions & 2 deletions include/linux/ceph/libceph.h
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Original file line number Diff line number Diff line change
Expand Up @@ -227,8 +227,10 @@ extern int ceph_open_session(struct ceph_client *client);
extern void ceph_release_page_vector(struct page **pages, int num_pages);

extern struct page **ceph_get_direct_page_vector(const char __user *data,
int num_pages);
extern void ceph_put_page_vector(struct page **pages, int num_pages);
int num_pages,
bool write_page);
extern void ceph_put_page_vector(struct page **pages, int num_pages,
bool dirty);
extern void ceph_release_page_vector(struct page **pages, int num_pages);
extern struct page **ceph_alloc_page_vector(int num_pages, gfp_t flags);
extern int ceph_copy_user_to_page_vector(struct page **pages,
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8 changes: 3 additions & 5 deletions net/ceph/messenger.c
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Original file line number Diff line number Diff line change
Expand Up @@ -97,11 +97,9 @@ struct workqueue_struct *ceph_msgr_wq;
int ceph_msgr_init(void)
{
ceph_msgr_wq = create_workqueue("ceph-msgr");
if (IS_ERR(ceph_msgr_wq)) {
int ret = PTR_ERR(ceph_msgr_wq);
pr_err("msgr_init failed to create workqueue: %d\n", ret);
ceph_msgr_wq = NULL;
return ret;
if (!ceph_msgr_wq) {
pr_err("msgr_init failed to create workqueue\n");
return -ENOMEM;
}
return 0;
}
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15 changes: 9 additions & 6 deletions net/ceph/pagevec.c
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Original file line number Diff line number Diff line change
Expand Up @@ -13,7 +13,7 @@
* build a vector of user pages
*/
struct page **ceph_get_direct_page_vector(const char __user *data,
int num_pages)
int num_pages, bool write_page)
{
struct page **pages;
int rc;
Expand All @@ -24,24 +24,27 @@ struct page **ceph_get_direct_page_vector(const char __user *data,

down_read(&current->mm->mmap_sem);
rc = get_user_pages(current, current->mm, (unsigned long)data,
num_pages, 0, 0, pages, NULL);
num_pages, write_page, 0, pages, NULL);
up_read(&current->mm->mmap_sem);
if (rc < 0)
if (rc < num_pages)
goto fail;
return pages;

fail:
kfree(pages);
ceph_put_page_vector(pages, rc > 0 ? rc : 0, false);
return ERR_PTR(rc);
}
EXPORT_SYMBOL(ceph_get_direct_page_vector);

void ceph_put_page_vector(struct page **pages, int num_pages)
void ceph_put_page_vector(struct page **pages, int num_pages, bool dirty)
{
int i;

for (i = 0; i < num_pages; i++)
for (i = 0; i < num_pages; i++) {
if (dirty)
set_page_dirty_lock(pages[i]);
put_page(pages[i]);
}
kfree(pages);
}
EXPORT_SYMBOL(ceph_put_page_vector);
Expand Down

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