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Diffstat (limited to 'kernel/fs/ceph/xattr.c')
-rw-r--r--kernel/fs/ceph/xattr.c65
1 files changed, 57 insertions, 8 deletions
diff --git a/kernel/fs/ceph/xattr.c b/kernel/fs/ceph/xattr.c
index cd7ffad40..819163d83 100644
--- a/kernel/fs/ceph/xattr.c
+++ b/kernel/fs/ceph/xattr.c
@@ -911,6 +911,8 @@ int __ceph_setxattr(struct dentry *dentry, const char *name,
struct inode *inode = d_inode(dentry);
struct ceph_vxattr *vxattr;
struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
+ struct ceph_cap_flush *prealloc_cf = NULL;
int issued;
int err;
int dirty = 0;
@@ -920,6 +922,7 @@ int __ceph_setxattr(struct dentry *dentry, const char *name,
char *newval = NULL;
struct ceph_inode_xattr *xattr = NULL;
int required_blob_size;
+ bool lock_snap_rwsem = false;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
@@ -948,12 +951,27 @@ int __ceph_setxattr(struct dentry *dentry, const char *name,
if (!xattr)
goto out;
+ prealloc_cf = ceph_alloc_cap_flush();
+ if (!prealloc_cf)
+ goto out;
+
spin_lock(&ci->i_ceph_lock);
retry:
issued = __ceph_caps_issued(ci, NULL);
- dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
+
+ if (!lock_snap_rwsem && !ci->i_head_snapc) {
+ lock_snap_rwsem = true;
+ if (!down_read_trylock(&mdsc->snap_rwsem)) {
+ spin_unlock(&ci->i_ceph_lock);
+ down_read(&mdsc->snap_rwsem);
+ spin_lock(&ci->i_ceph_lock);
+ goto retry;
+ }
+ }
+
+ dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
__build_xattrs(inode);
required_blob_size = __get_required_blob_size(ci, name_len, val_len);
@@ -966,7 +984,7 @@ retry:
dout(" preaallocating new blob size=%d\n", required_blob_size);
blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
if (!blob)
- goto out;
+ goto do_sync_unlocked;
spin_lock(&ci->i_ceph_lock);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
@@ -978,21 +996,28 @@ retry:
flags, value ? 1 : -1, &xattr);
if (!err) {
- dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
+ dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
+ &prealloc_cf);
ci->i_xattrs.dirty = true;
inode->i_ctime = CURRENT_TIME;
}
spin_unlock(&ci->i_ceph_lock);
+ if (lock_snap_rwsem)
+ up_read(&mdsc->snap_rwsem);
if (dirty)
__mark_inode_dirty(inode, dirty);
+ ceph_free_cap_flush(prealloc_cf);
return err;
do_sync:
spin_unlock(&ci->i_ceph_lock);
do_sync_unlocked:
+ if (lock_snap_rwsem)
+ up_read(&mdsc->snap_rwsem);
err = ceph_sync_setxattr(dentry, name, value, size, flags);
out:
+ ceph_free_cap_flush(prealloc_cf);
kfree(newname);
kfree(newval);
kfree(xattr);
@@ -1044,10 +1069,13 @@ int __ceph_removexattr(struct dentry *dentry, const char *name)
struct inode *inode = d_inode(dentry);
struct ceph_vxattr *vxattr;
struct ceph_inode_info *ci = ceph_inode(inode);
+ struct ceph_mds_client *mdsc = ceph_sb_to_client(dentry->d_sb)->mdsc;
+ struct ceph_cap_flush *prealloc_cf = NULL;
int issued;
int err;
int required_blob_size;
int dirty;
+ bool lock_snap_rwsem = false;
if (!ceph_is_valid_xattr(name))
return -EOPNOTSUPP;
@@ -1060,14 +1088,29 @@ int __ceph_removexattr(struct dentry *dentry, const char *name)
if (!strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN))
goto do_sync_unlocked;
+ prealloc_cf = ceph_alloc_cap_flush();
+ if (!prealloc_cf)
+ return -ENOMEM;
+
err = -ENOMEM;
spin_lock(&ci->i_ceph_lock);
retry:
issued = __ceph_caps_issued(ci, NULL);
- dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
-
if (ci->i_xattrs.version == 0 || !(issued & CEPH_CAP_XATTR_EXCL))
goto do_sync;
+
+ if (!lock_snap_rwsem && !ci->i_head_snapc) {
+ lock_snap_rwsem = true;
+ if (!down_read_trylock(&mdsc->snap_rwsem)) {
+ spin_unlock(&ci->i_ceph_lock);
+ down_read(&mdsc->snap_rwsem);
+ spin_lock(&ci->i_ceph_lock);
+ goto retry;
+ }
+ }
+
+ dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
+
__build_xattrs(inode);
required_blob_size = __get_required_blob_size(ci, 0, 0);
@@ -1080,7 +1123,7 @@ retry:
dout(" preaallocating new blob size=%d\n", required_blob_size);
blob = ceph_buffer_new(required_blob_size, GFP_NOFS);
if (!blob)
- goto out;
+ goto do_sync_unlocked;
spin_lock(&ci->i_ceph_lock);
if (ci->i_xattrs.prealloc_blob)
ceph_buffer_put(ci->i_xattrs.prealloc_blob);
@@ -1090,18 +1133,24 @@ retry:
err = __remove_xattr_by_name(ceph_inode(inode), name);
- dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
+ dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL,
+ &prealloc_cf);
ci->i_xattrs.dirty = true;
inode->i_ctime = CURRENT_TIME;
spin_unlock(&ci->i_ceph_lock);
+ if (lock_snap_rwsem)
+ up_read(&mdsc->snap_rwsem);
if (dirty)
__mark_inode_dirty(inode, dirty);
+ ceph_free_cap_flush(prealloc_cf);
return err;
do_sync:
spin_unlock(&ci->i_ceph_lock);
do_sync_unlocked:
+ if (lock_snap_rwsem)
+ up_read(&mdsc->snap_rwsem);
+ ceph_free_cap_flush(prealloc_cf);
err = ceph_send_removexattr(dentry, name);
-out:
return err;
}