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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

Pull two Ceph fixes from Sage Weil:
 "One of these is fixing a regression from the d_flags file type patch
  that went into -rc1 that broke instantiation of inodes and dentries
  (we were doing dentries first).  The other is just an off-by-one
  corner case"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client:
  ceph: Avoid data inconsistency due to d-cache aliasing in readpage()
  ceph: initialize inode before instantiating dentry
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@torvalds
torvalds committed Dec 17, 2013
2 parents 4ddebaf + 56f91aa commit a5905a9
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Showing 2 changed files with 64 additions and 80 deletions.
8 changes: 6 additions & 2 deletions fs/ceph/addr.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -210,9 +210,13 @@ static int readpage_nounlock(struct file *filp, struct page *page)
if (err < 0) {
SetPageError(page);
goto out;
} else if (err < PAGE_CACHE_SIZE) {
} else {
if (err < PAGE_CACHE_SIZE) {
/* zero fill remainder of page */
zero_user_segment(page, err, PAGE_CACHE_SIZE);
zero_user_segment(page, err, PAGE_CACHE_SIZE);
} else {
flush_dcache_page(page);
}
}
SetPageUptodate(page);

Expand Down
136 changes: 58 additions & 78 deletions fs/ceph/inode.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -978,7 +978,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
struct ceph_mds_reply_inode *ininfo;
struct ceph_vino vino;
struct ceph_fs_client *fsc = ceph_sb_to_client(sb);
int i = 0;
int err = 0;

dout("fill_trace %p is_dentry %d is_target %d\n", req,
Expand Down Expand Up @@ -1039,6 +1038,29 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
}
}

if (rinfo->head->is_target) {
vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);

in = ceph_get_inode(sb, vino);
if (IS_ERR(in)) {
err = PTR_ERR(in);
goto done;
}
req->r_target_inode = in;

err = fill_inode(in, &rinfo->targeti, NULL,
session, req->r_request_started,
(le32_to_cpu(rinfo->head->result) == 0) ?
req->r_fmode : -1,
&req->r_caps_reservation);
if (err < 0) {
pr_err("fill_inode badness %p %llx.%llx\n",
in, ceph_vinop(in));
goto done;
}
}

/*
* ignore null lease/binding on snapdir ENOENT, or else we
* will have trouble splicing in the virtual snapdir later
Expand Down Expand Up @@ -1108,7 +1130,6 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
ceph_dentry(req->r_old_dentry)->offset);

dn = req->r_old_dentry; /* use old_dentry */
in = dn->d_inode;
}

/* null dentry? */
Expand All @@ -1130,44 +1151,28 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
}

/* attach proper inode */
ininfo = rinfo->targeti.in;
vino.ino = le64_to_cpu(ininfo->ino);
vino.snap = le64_to_cpu(ininfo->snapid);
in = dn->d_inode;
if (!in) {
in = ceph_get_inode(sb, vino);
if (IS_ERR(in)) {
pr_err("fill_trace bad get_inode "
"%llx.%llx\n", vino.ino, vino.snap);
err = PTR_ERR(in);
d_drop(dn);
goto done;
}
if (!dn->d_inode) {
ihold(in);
dn = splice_dentry(dn, in, &have_lease, true);
if (IS_ERR(dn)) {
err = PTR_ERR(dn);
goto done;
}
req->r_dentry = dn; /* may have spliced */
ihold(in);
} else if (ceph_ino(in) == vino.ino &&
ceph_snap(in) == vino.snap) {
ihold(in);
} else {
} else if (dn->d_inode && dn->d_inode != in) {
dout(" %p links to %p %llx.%llx, not %llx.%llx\n",
dn, in, ceph_ino(in), ceph_snap(in),
vino.ino, vino.snap);
dn, dn->d_inode, ceph_vinop(dn->d_inode),
ceph_vinop(in));
have_lease = false;
in = NULL;
}

if (have_lease)
update_dentry_lease(dn, rinfo->dlease, session,
req->r_request_started);
dout(" final dn %p\n", dn);
i++;
} else if ((req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP) && !req->r_aborted) {
} else if (!req->r_aborted &&
(req->r_op == CEPH_MDS_OP_LOOKUPSNAP ||
req->r_op == CEPH_MDS_OP_MKSNAP)) {
struct dentry *dn = req->r_dentry;

/* fill out a snapdir LOOKUPSNAP dentry */
Expand All @@ -1177,52 +1182,15 @@ int ceph_fill_trace(struct super_block *sb, struct ceph_mds_request *req,
ininfo = rinfo->targeti.in;
vino.ino = le64_to_cpu(ininfo->ino);
vino.snap = le64_to_cpu(ininfo->snapid);
in = ceph_get_inode(sb, vino);
if (IS_ERR(in)) {
pr_err("fill_inode get_inode badness %llx.%llx\n",
vino.ino, vino.snap);
err = PTR_ERR(in);
d_delete(dn);
goto done;
}
dout(" linking snapped dir %p to dn %p\n", in, dn);
ihold(in);
dn = splice_dentry(dn, in, NULL, true);
if (IS_ERR(dn)) {
err = PTR_ERR(dn);
goto done;
}
req->r_dentry = dn; /* may have spliced */
ihold(in);
rinfo->head->is_dentry = 1; /* fool notrace handlers */
}

if (rinfo->head->is_target) {
vino.ino = le64_to_cpu(rinfo->targeti.in->ino);
vino.snap = le64_to_cpu(rinfo->targeti.in->snapid);

if (in == NULL || ceph_ino(in) != vino.ino ||
ceph_snap(in) != vino.snap) {
in = ceph_get_inode(sb, vino);
if (IS_ERR(in)) {
err = PTR_ERR(in);
goto done;
}
}
req->r_target_inode = in;

err = fill_inode(in,
&rinfo->targeti, NULL,
session, req->r_request_started,
(le32_to_cpu(rinfo->head->result) == 0) ?
req->r_fmode : -1,
&req->r_caps_reservation);
if (err < 0) {
pr_err("fill_inode badness %p %llx.%llx\n",
in, ceph_vinop(in));
goto done;
}
}

done:
dout("fill_trace done err=%d\n", err);
return err;
Expand Down Expand Up @@ -1272,7 +1240,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
struct qstr dname;
struct dentry *dn;
struct inode *in;
int err = 0, i;
int err = 0, ret, i;
struct inode *snapdir = NULL;
struct ceph_mds_request_head *rhead = req->r_request->front.iov_base;
struct ceph_dentry_info *di;
Expand Down Expand Up @@ -1305,6 +1273,7 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
ceph_fill_dirfrag(parent->d_inode, rinfo->dir_dir);
}

/* FIXME: release caps/leases if error occurs */
for (i = 0; i < rinfo->dir_nr; i++) {
struct ceph_vino vino;

Expand All @@ -1329,9 +1298,10 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
err = -ENOMEM;
goto out;
}
err = ceph_init_dentry(dn);
if (err < 0) {
ret = ceph_init_dentry(dn);
if (ret < 0) {
dput(dn);
err = ret;
goto out;
}
} else if (dn->d_inode &&
Expand All @@ -1351,9 +1321,6 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
spin_unlock(&parent->d_lock);
}

di = dn->d_fsdata;
di->offset = ceph_make_fpos(frag, i + r_readdir_offset);

/* inode */
if (dn->d_inode) {
in = dn->d_inode;
Expand All @@ -1366,26 +1333,39 @@ int ceph_readdir_prepopulate(struct ceph_mds_request *req,
err = PTR_ERR(in);
goto out;
}
dn = splice_dentry(dn, in, NULL, false);
if (IS_ERR(dn))
dn = NULL;
}

if (fill_inode(in, &rinfo->dir_in[i], NULL, session,
req->r_request_started, -1,
&req->r_caps_reservation) < 0) {
pr_err("fill_inode badness on %p\n", in);
if (!dn->d_inode)
iput(in);
d_drop(dn);
goto next_item;
}
if (dn)
update_dentry_lease(dn, rinfo->dir_dlease[i],
req->r_session,
req->r_request_started);

if (!dn->d_inode) {
dn = splice_dentry(dn, in, NULL, false);
if (IS_ERR(dn)) {
err = PTR_ERR(dn);
dn = NULL;
goto next_item;
}
}

di = dn->d_fsdata;
di->offset = ceph_make_fpos(frag, i + r_readdir_offset);

update_dentry_lease(dn, rinfo->dir_dlease[i],
req->r_session,
req->r_request_started);
next_item:
if (dn)
dput(dn);
}
req->r_did_prepopulate = true;
if (err == 0)
req->r_did_prepopulate = true;

out:
if (snapdir) {
Expand Down

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