From 863981e96738983919de841ec669e157e6bdaeb0 Mon Sep 17 00:00:00 2001 From: André Fabian Silva Delgado Date: Sun, 11 Sep 2016 04:34:46 -0300 Subject: Linux-libre 4.7.1-gnu --- fs/ceph/xattr.c | 218 +++++++++++--------------------------------------------- 1 file changed, 41 insertions(+), 177 deletions(-) (limited to 'fs/ceph/xattr.c') diff --git a/fs/ceph/xattr.c b/fs/ceph/xattr.c index 9410abdef..4870b29df 100644 --- a/fs/ceph/xattr.c +++ b/fs/ceph/xattr.c @@ -16,6 +16,8 @@ static int __remove_xattr(struct ceph_inode_info *ci, struct ceph_inode_xattr *xattr); +const struct xattr_handler ceph_other_xattr_handler; + /* * List of handlers for synthetic system.* attributes. Other * attributes are handled directly. @@ -25,6 +27,7 @@ const struct xattr_handler *ceph_xattr_handlers[] = { &posix_acl_access_xattr_handler, &posix_acl_default_xattr_handler, #endif + &ceph_other_xattr_handler, NULL, }; @@ -33,7 +36,6 @@ static bool ceph_is_valid_xattr(const char *name) return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) || !strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN) || - !strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN) || !strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) || !strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN); } @@ -75,7 +77,7 @@ static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, char buf[128]; dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode); - down_read(&osdc->map_sem); + down_read(&osdc->lock); pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); if (pool_name) { size_t len = strlen(pool_name); @@ -107,7 +109,7 @@ static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val, ret = -ERANGE; } } - up_read(&osdc->map_sem); + up_read(&osdc->lock); return ret; } @@ -141,13 +143,13 @@ static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci, s64 pool = ceph_file_layout_pg_pool(ci->i_layout); const char *pool_name; - down_read(&osdc->map_sem); + down_read(&osdc->lock); pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool); if (pool_name) ret = snprintf(val, size, "%s", pool_name); else ret = snprintf(val, size, "%lld", (unsigned long long)pool); - up_read(&osdc->map_sem); + up_read(&osdc->lock); return ret; } @@ -496,19 +498,6 @@ static int __remove_xattr(struct ceph_inode_info *ci, return 0; } -static int __remove_xattr_by_name(struct ceph_inode_info *ci, - const char *name) -{ - struct rb_node **p; - struct ceph_inode_xattr *xattr; - int err; - - p = &ci->i_xattrs.index.rb_node; - xattr = __get_xattr(ci, name); - err = __remove_xattr(ci, xattr); - return err; -} - static char *__copy_xattr_names(struct ceph_inode_info *ci, char *dest) { @@ -740,9 +729,6 @@ ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value, int req_mask; int err; - if (!ceph_is_valid_xattr(name)) - return -ENODATA; - /* let's see if a virtual xattr was requested */ vxattr = ceph_match_vxattr(inode, name); if (vxattr) { @@ -804,15 +790,6 @@ out: return err; } -ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value, - size_t size) -{ - if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) - return generic_getxattr(dentry, name, value, size); - - return __ceph_getxattr(d_inode(dentry), name, value, size); -} - ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size) { struct inode *inode = d_inode(dentry); @@ -877,15 +854,15 @@ out: return err; } -static int ceph_sync_setxattr(struct dentry *dentry, const char *name, +static int ceph_sync_setxattr(struct inode *inode, const char *name, const char *value, size_t size, int flags) { - struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); - struct inode *inode = d_inode(dentry); + struct ceph_fs_client *fsc = ceph_sb_to_client(inode->i_sb); struct ceph_inode_info *ci = ceph_inode(inode); struct ceph_mds_request *req; struct ceph_mds_client *mdsc = fsc->mdsc; struct ceph_pagelist *pagelist = NULL; + int op = CEPH_MDS_OP_SETXATTR; int err; if (size > 0) { @@ -899,20 +876,21 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name, if (err) goto out; } else if (!value) { - flags |= CEPH_XATTR_REMOVE; + if (flags & CEPH_XATTR_REPLACE) + op = CEPH_MDS_OP_RMXATTR; + else + flags |= CEPH_XATTR_REMOVE; } dout("setxattr value=%.*s\n", (int)size, value); /* do request */ - req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR, - USE_AUTH_MDS); + req = ceph_mdsc_create_request(mdsc, op, USE_AUTH_MDS); if (IS_ERR(req)) { err = PTR_ERR(req); goto out; } - req->r_args.setxattr.flags = cpu_to_le32(flags); req->r_path2 = kstrdup(name, GFP_NOFS); if (!req->r_path2) { ceph_mdsc_put_request(req); @@ -920,8 +898,11 @@ static int ceph_sync_setxattr(struct dentry *dentry, const char *name, goto out; } - req->r_pagelist = pagelist; - pagelist = NULL; + if (op == CEPH_MDS_OP_SETXATTR) { + req->r_args.setxattr.flags = cpu_to_le32(flags); + req->r_pagelist = pagelist; + pagelist = NULL; + } req->r_inode = inode; ihold(inode); @@ -939,13 +920,12 @@ out: return err; } -int __ceph_setxattr(struct dentry *dentry, const char *name, +int __ceph_setxattr(struct inode *inode, const char *name, const void *value, size_t size, int flags) { - 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_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc; struct ceph_cap_flush *prealloc_cf = NULL; int issued; int err; @@ -958,8 +938,8 @@ int __ceph_setxattr(struct dentry *dentry, const char *name, int required_blob_size; bool lock_snap_rwsem = false; - if (!ceph_is_valid_xattr(name)) - return -EOPNOTSUPP; + if (ceph_snap(inode) != CEPH_NOSNAP) + return -EROFS; vxattr = ceph_match_vxattr(inode, name); if (vxattr && vxattr->readonly) @@ -1056,7 +1036,7 @@ do_sync_unlocked: "during filling trace\n", inode); err = -EBUSY; } else { - err = ceph_sync_setxattr(dentry, name, value, size, flags); + err = ceph_sync_setxattr(inode, name, value, size, flags); } out: ceph_free_cap_flush(prealloc_cf); @@ -1066,146 +1046,30 @@ out: return err; } -int ceph_setxattr(struct dentry *dentry, const char *name, - const void *value, size_t size, int flags) +static int ceph_get_xattr_handler(const struct xattr_handler *handler, + struct dentry *dentry, struct inode *inode, + const char *name, void *value, size_t size) { - if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) - return -EROFS; - - if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) - return generic_setxattr(dentry, name, value, size, flags); - - if (size == 0) - value = ""; /* empty EA, do not remove */ - - return __ceph_setxattr(dentry, name, value, size, flags); -} - -static int ceph_send_removexattr(struct dentry *dentry, const char *name) -{ - struct ceph_fs_client *fsc = ceph_sb_to_client(dentry->d_sb); - struct ceph_mds_client *mdsc = fsc->mdsc; - struct inode *inode = d_inode(dentry); - struct ceph_mds_request *req; - int err; - - req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_RMXATTR, - USE_AUTH_MDS); - if (IS_ERR(req)) - return PTR_ERR(req); - req->r_path2 = kstrdup(name, GFP_NOFS); - if (!req->r_path2) - return -ENOMEM; - - req->r_inode = inode; - ihold(inode); - req->r_num_caps = 1; - req->r_inode_drop = CEPH_CAP_XATTR_SHARED; - err = ceph_mdsc_do_request(mdsc, NULL, req); - ceph_mdsc_put_request(req); - return err; + if (!ceph_is_valid_xattr(name)) + return -EOPNOTSUPP; + return __ceph_getxattr(inode, name, value, size); } -int __ceph_removexattr(struct dentry *dentry, const char *name) +static int ceph_set_xattr_handler(const struct xattr_handler *handler, + struct dentry *unused, struct inode *inode, + const char *name, const void *value, + size_t size, int flags) { - 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; - - vxattr = ceph_match_vxattr(inode, name); - if (vxattr && vxattr->readonly) - return -EOPNOTSUPP; - - /* pass any unhandled ceph.* xattrs through to the MDS */ - 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); - 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); - - if (!ci->i_xattrs.prealloc_blob || - required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) { - struct ceph_buffer *blob; - - spin_unlock(&ci->i_ceph_lock); - dout(" preaallocating new blob size=%d\n", required_blob_size); - blob = ceph_buffer_new(required_blob_size, GFP_NOFS); - if (!blob) - goto do_sync_unlocked; - spin_lock(&ci->i_ceph_lock); - if (ci->i_xattrs.prealloc_blob) - ceph_buffer_put(ci->i_xattrs.prealloc_blob); - ci->i_xattrs.prealloc_blob = blob; - goto retry; - } - - err = __remove_xattr_by_name(ceph_inode(inode), name); - - dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL, - &prealloc_cf); - ci->i_xattrs.dirty = true; - inode->i_ctime = current_fs_time(inode->i_sb); - 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); - return err; + return __ceph_setxattr(inode, name, value, size, flags); } -int ceph_removexattr(struct dentry *dentry, const char *name) -{ - if (ceph_snap(d_inode(dentry)) != CEPH_NOSNAP) - return -EROFS; - - if (!strncmp(name, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) - return generic_removexattr(dentry, name); - - return __ceph_removexattr(dentry, name); -} +const struct xattr_handler ceph_other_xattr_handler = { + .prefix = "", /* match any name => handlers called with full name */ + .get = ceph_get_xattr_handler, + .set = ceph_set_xattr_handler, +}; #ifdef CONFIG_SECURITY bool ceph_security_xattr_wanted(struct inode *in) -- cgit v1.2.3-54-g00ecf