![Sage Weil](/assets/img/avatar_default.png)
We have been using i_lock to protect all kinds of data structures in the ceph_inode_info struct, including lists of inodes that we need to iterate over while avoiding races with inode destruction. That requires grabbing a reference to the inode with the list lock protected, but igrab() now takes i_lock to check the inode flags. Changing the list lock ordering would be a painful process. However, using a ceph-specific i_ceph_lock in the ceph inode instead of i_lock is a simple mechanical change and avoids the ordering constraints imposed by igrab(). Reported-by: Amon Ott <a.ott@m-privacy.de> Signed-off-by: Sage Weil <sage@newdream.net>
859 lines
21 KiB
C
859 lines
21 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include "super.h"
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#include "mds_client.h"
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#include <linux/ceph/decode.h>
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#include <linux/xattr.h>
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#include <linux/slab.h>
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static bool ceph_is_valid_xattr(const char *name)
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{
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return !strncmp(name, "ceph.", 5) ||
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!strncmp(name, XATTR_SECURITY_PREFIX,
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XATTR_SECURITY_PREFIX_LEN) ||
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!strncmp(name, XATTR_TRUSTED_PREFIX, XATTR_TRUSTED_PREFIX_LEN) ||
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!strncmp(name, XATTR_USER_PREFIX, XATTR_USER_PREFIX_LEN);
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}
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/*
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* These define virtual xattrs exposing the recursive directory
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* statistics and layout metadata.
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*/
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struct ceph_vxattr_cb {
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bool readonly;
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char *name;
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size_t (*getxattr_cb)(struct ceph_inode_info *ci, char *val,
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size_t size);
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};
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/* directories */
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static size_t ceph_vxattrcb_entries(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%lld", ci->i_files + ci->i_subdirs);
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}
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static size_t ceph_vxattrcb_files(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%lld", ci->i_files);
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}
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static size_t ceph_vxattrcb_subdirs(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%lld", ci->i_subdirs);
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}
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static size_t ceph_vxattrcb_rentries(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%lld", ci->i_rfiles + ci->i_rsubdirs);
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}
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static size_t ceph_vxattrcb_rfiles(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%lld", ci->i_rfiles);
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}
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static size_t ceph_vxattrcb_rsubdirs(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%lld", ci->i_rsubdirs);
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}
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static size_t ceph_vxattrcb_rbytes(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%lld", ci->i_rbytes);
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}
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static size_t ceph_vxattrcb_rctime(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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return snprintf(val, size, "%ld.%ld", (long)ci->i_rctime.tv_sec,
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(long)ci->i_rctime.tv_nsec);
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}
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static struct ceph_vxattr_cb ceph_dir_vxattrs[] = {
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{ true, "ceph.dir.entries", ceph_vxattrcb_entries},
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{ true, "ceph.dir.files", ceph_vxattrcb_files},
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{ true, "ceph.dir.subdirs", ceph_vxattrcb_subdirs},
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{ true, "ceph.dir.rentries", ceph_vxattrcb_rentries},
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{ true, "ceph.dir.rfiles", ceph_vxattrcb_rfiles},
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{ true, "ceph.dir.rsubdirs", ceph_vxattrcb_rsubdirs},
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{ true, "ceph.dir.rbytes", ceph_vxattrcb_rbytes},
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{ true, "ceph.dir.rctime", ceph_vxattrcb_rctime},
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{ true, NULL, NULL }
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};
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/* files */
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static size_t ceph_vxattrcb_layout(struct ceph_inode_info *ci, char *val,
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size_t size)
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{
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int ret;
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ret = snprintf(val, size,
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"chunk_bytes=%lld\nstripe_count=%lld\nobject_size=%lld\n",
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(unsigned long long)ceph_file_layout_su(ci->i_layout),
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(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout),
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(unsigned long long)ceph_file_layout_object_size(ci->i_layout));
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if (ceph_file_layout_pg_preferred(ci->i_layout))
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ret += snprintf(val + ret, size, "preferred_osd=%lld\n",
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(unsigned long long)ceph_file_layout_pg_preferred(
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ci->i_layout));
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return ret;
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}
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static struct ceph_vxattr_cb ceph_file_vxattrs[] = {
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{ true, "ceph.layout", ceph_vxattrcb_layout},
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{ NULL, NULL }
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};
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static struct ceph_vxattr_cb *ceph_inode_vxattrs(struct inode *inode)
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{
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if (S_ISDIR(inode->i_mode))
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return ceph_dir_vxattrs;
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else if (S_ISREG(inode->i_mode))
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return ceph_file_vxattrs;
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return NULL;
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}
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static struct ceph_vxattr_cb *ceph_match_vxattr(struct ceph_vxattr_cb *vxattr,
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const char *name)
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{
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do {
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if (strcmp(vxattr->name, name) == 0)
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return vxattr;
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vxattr++;
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} while (vxattr->name);
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return NULL;
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}
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static int __set_xattr(struct ceph_inode_info *ci,
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const char *name, int name_len,
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const char *val, int val_len,
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int dirty,
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int should_free_name, int should_free_val,
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struct ceph_inode_xattr **newxattr)
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{
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struct rb_node **p;
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struct rb_node *parent = NULL;
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struct ceph_inode_xattr *xattr = NULL;
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int c;
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int new = 0;
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p = &ci->i_xattrs.index.rb_node;
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while (*p) {
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parent = *p;
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xattr = rb_entry(parent, struct ceph_inode_xattr, node);
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c = strncmp(name, xattr->name, min(name_len, xattr->name_len));
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if (c < 0)
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p = &(*p)->rb_left;
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else if (c > 0)
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p = &(*p)->rb_right;
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else {
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if (name_len == xattr->name_len)
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break;
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else if (name_len < xattr->name_len)
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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xattr = NULL;
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}
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if (!xattr) {
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new = 1;
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xattr = *newxattr;
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xattr->name = name;
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xattr->name_len = name_len;
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xattr->should_free_name = should_free_name;
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ci->i_xattrs.count++;
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dout("__set_xattr count=%d\n", ci->i_xattrs.count);
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} else {
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kfree(*newxattr);
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*newxattr = NULL;
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if (xattr->should_free_val)
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kfree((void *)xattr->val);
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if (should_free_name) {
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kfree((void *)name);
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name = xattr->name;
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}
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ci->i_xattrs.names_size -= xattr->name_len;
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ci->i_xattrs.vals_size -= xattr->val_len;
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}
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ci->i_xattrs.names_size += name_len;
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ci->i_xattrs.vals_size += val_len;
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if (val)
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xattr->val = val;
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else
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xattr->val = "";
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xattr->val_len = val_len;
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xattr->dirty = dirty;
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xattr->should_free_val = (val && should_free_val);
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if (new) {
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rb_link_node(&xattr->node, parent, p);
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rb_insert_color(&xattr->node, &ci->i_xattrs.index);
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dout("__set_xattr_val p=%p\n", p);
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}
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dout("__set_xattr_val added %llx.%llx xattr %p %s=%.*s\n",
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ceph_vinop(&ci->vfs_inode), xattr, name, val_len, val);
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return 0;
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}
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static struct ceph_inode_xattr *__get_xattr(struct ceph_inode_info *ci,
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const char *name)
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{
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struct rb_node **p;
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struct rb_node *parent = NULL;
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struct ceph_inode_xattr *xattr = NULL;
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int name_len = strlen(name);
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int c;
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p = &ci->i_xattrs.index.rb_node;
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while (*p) {
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parent = *p;
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xattr = rb_entry(parent, struct ceph_inode_xattr, node);
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c = strncmp(name, xattr->name, xattr->name_len);
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if (c == 0 && name_len > xattr->name_len)
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c = 1;
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if (c < 0)
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p = &(*p)->rb_left;
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else if (c > 0)
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p = &(*p)->rb_right;
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else {
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dout("__get_xattr %s: found %.*s\n", name,
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xattr->val_len, xattr->val);
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return xattr;
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}
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}
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dout("__get_xattr %s: not found\n", name);
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return NULL;
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}
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static void __free_xattr(struct ceph_inode_xattr *xattr)
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{
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BUG_ON(!xattr);
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if (xattr->should_free_name)
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kfree((void *)xattr->name);
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if (xattr->should_free_val)
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kfree((void *)xattr->val);
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kfree(xattr);
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}
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static int __remove_xattr(struct ceph_inode_info *ci,
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struct ceph_inode_xattr *xattr)
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{
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if (!xattr)
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return -EOPNOTSUPP;
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rb_erase(&xattr->node, &ci->i_xattrs.index);
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if (xattr->should_free_name)
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kfree((void *)xattr->name);
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if (xattr->should_free_val)
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kfree((void *)xattr->val);
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ci->i_xattrs.names_size -= xattr->name_len;
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ci->i_xattrs.vals_size -= xattr->val_len;
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ci->i_xattrs.count--;
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kfree(xattr);
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return 0;
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}
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static int __remove_xattr_by_name(struct ceph_inode_info *ci,
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const char *name)
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{
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struct rb_node **p;
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struct ceph_inode_xattr *xattr;
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int err;
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p = &ci->i_xattrs.index.rb_node;
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xattr = __get_xattr(ci, name);
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err = __remove_xattr(ci, xattr);
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return err;
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}
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static char *__copy_xattr_names(struct ceph_inode_info *ci,
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char *dest)
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{
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struct rb_node *p;
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struct ceph_inode_xattr *xattr = NULL;
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p = rb_first(&ci->i_xattrs.index);
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dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
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while (p) {
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xattr = rb_entry(p, struct ceph_inode_xattr, node);
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memcpy(dest, xattr->name, xattr->name_len);
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dest[xattr->name_len] = '\0';
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dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
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xattr->name_len, ci->i_xattrs.names_size);
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dest += xattr->name_len + 1;
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p = rb_next(p);
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}
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return dest;
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}
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void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
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{
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struct rb_node *p, *tmp;
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struct ceph_inode_xattr *xattr = NULL;
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p = rb_first(&ci->i_xattrs.index);
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dout("__ceph_destroy_xattrs p=%p\n", p);
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while (p) {
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xattr = rb_entry(p, struct ceph_inode_xattr, node);
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tmp = p;
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p = rb_next(tmp);
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dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
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xattr->name_len, xattr->name);
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rb_erase(tmp, &ci->i_xattrs.index);
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__free_xattr(xattr);
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}
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ci->i_xattrs.names_size = 0;
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ci->i_xattrs.vals_size = 0;
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ci->i_xattrs.index_version = 0;
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ci->i_xattrs.count = 0;
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ci->i_xattrs.index = RB_ROOT;
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}
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static int __build_xattrs(struct inode *inode)
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__releases(ci->i_ceph_lock)
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__acquires(ci->i_ceph_lock)
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{
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u32 namelen;
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u32 numattr = 0;
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void *p, *end;
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u32 len;
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const char *name, *val;
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struct ceph_inode_info *ci = ceph_inode(inode);
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int xattr_version;
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struct ceph_inode_xattr **xattrs = NULL;
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int err = 0;
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int i;
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dout("__build_xattrs() len=%d\n",
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ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
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if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
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return 0; /* already built */
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__ceph_destroy_xattrs(ci);
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start:
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/* updated internal xattr rb tree */
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if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
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p = ci->i_xattrs.blob->vec.iov_base;
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end = p + ci->i_xattrs.blob->vec.iov_len;
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ceph_decode_32_safe(&p, end, numattr, bad);
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xattr_version = ci->i_xattrs.version;
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spin_unlock(&ci->i_ceph_lock);
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xattrs = kcalloc(numattr, sizeof(struct ceph_xattr *),
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GFP_NOFS);
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err = -ENOMEM;
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if (!xattrs)
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goto bad_lock;
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memset(xattrs, 0, numattr*sizeof(struct ceph_xattr *));
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for (i = 0; i < numattr; i++) {
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xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
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GFP_NOFS);
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if (!xattrs[i])
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goto bad_lock;
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}
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spin_lock(&ci->i_ceph_lock);
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if (ci->i_xattrs.version != xattr_version) {
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/* lost a race, retry */
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for (i = 0; i < numattr; i++)
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kfree(xattrs[i]);
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kfree(xattrs);
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goto start;
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}
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err = -EIO;
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while (numattr--) {
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ceph_decode_32_safe(&p, end, len, bad);
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namelen = len;
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name = p;
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p += len;
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ceph_decode_32_safe(&p, end, len, bad);
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val = p;
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p += len;
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err = __set_xattr(ci, name, namelen, val, len,
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0, 0, 0, &xattrs[numattr]);
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if (err < 0)
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goto bad;
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}
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kfree(xattrs);
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}
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ci->i_xattrs.index_version = ci->i_xattrs.version;
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ci->i_xattrs.dirty = false;
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return err;
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bad_lock:
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spin_lock(&ci->i_ceph_lock);
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bad:
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if (xattrs) {
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for (i = 0; i < numattr; i++)
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kfree(xattrs[i]);
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kfree(xattrs);
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}
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ci->i_xattrs.names_size = 0;
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return err;
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}
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static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
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int val_size)
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{
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/*
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* 4 bytes for the length, and additional 4 bytes per each xattr name,
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* 4 bytes per each value
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*/
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int size = 4 + ci->i_xattrs.count*(4 + 4) +
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ci->i_xattrs.names_size +
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ci->i_xattrs.vals_size;
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dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
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ci->i_xattrs.count, ci->i_xattrs.names_size,
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ci->i_xattrs.vals_size);
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if (name_size)
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size += 4 + 4 + name_size + val_size;
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return size;
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}
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/*
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* If there are dirty xattrs, reencode xattrs into the prealloc_blob
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* and swap into place.
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*/
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void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
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{
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struct rb_node *p;
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struct ceph_inode_xattr *xattr = NULL;
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void *dest;
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dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
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if (ci->i_xattrs.dirty) {
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int need = __get_required_blob_size(ci, 0, 0);
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BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
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p = rb_first(&ci->i_xattrs.index);
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dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
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ceph_encode_32(&dest, ci->i_xattrs.count);
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while (p) {
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xattr = rb_entry(p, struct ceph_inode_xattr, node);
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ceph_encode_32(&dest, xattr->name_len);
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memcpy(dest, xattr->name, xattr->name_len);
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dest += xattr->name_len;
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ceph_encode_32(&dest, xattr->val_len);
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memcpy(dest, xattr->val, xattr->val_len);
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dest += xattr->val_len;
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p = rb_next(p);
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}
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|
|
/* adjust buffer len; it may be larger than we need */
|
|
ci->i_xattrs.prealloc_blob->vec.iov_len =
|
|
dest - ci->i_xattrs.prealloc_blob->vec.iov_base;
|
|
|
|
if (ci->i_xattrs.blob)
|
|
ceph_buffer_put(ci->i_xattrs.blob);
|
|
ci->i_xattrs.blob = ci->i_xattrs.prealloc_blob;
|
|
ci->i_xattrs.prealloc_blob = NULL;
|
|
ci->i_xattrs.dirty = false;
|
|
ci->i_xattrs.version++;
|
|
}
|
|
}
|
|
|
|
ssize_t ceph_getxattr(struct dentry *dentry, const char *name, void *value,
|
|
size_t size)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
|
|
int err;
|
|
struct ceph_inode_xattr *xattr;
|
|
struct ceph_vxattr_cb *vxattr = NULL;
|
|
|
|
if (!ceph_is_valid_xattr(name))
|
|
return -ENODATA;
|
|
|
|
/* let's see if a virtual xattr was requested */
|
|
if (vxattrs)
|
|
vxattr = ceph_match_vxattr(vxattrs, name);
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
dout("getxattr %p ver=%lld index_ver=%lld\n", inode,
|
|
ci->i_xattrs.version, ci->i_xattrs.index_version);
|
|
|
|
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
|
|
(ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
|
|
goto get_xattr;
|
|
} else {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
/* get xattrs from mds (if we don't already have them) */
|
|
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
|
|
if (vxattr && vxattr->readonly) {
|
|
err = vxattr->getxattr_cb(ci, value, size);
|
|
goto out;
|
|
}
|
|
|
|
err = __build_xattrs(inode);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
get_xattr:
|
|
err = -ENODATA; /* == ENOATTR */
|
|
xattr = __get_xattr(ci, name);
|
|
if (!xattr) {
|
|
if (vxattr)
|
|
err = vxattr->getxattr_cb(ci, value, size);
|
|
goto out;
|
|
}
|
|
|
|
err = -ERANGE;
|
|
if (size && size < xattr->val_len)
|
|
goto out;
|
|
|
|
err = xattr->val_len;
|
|
if (size == 0)
|
|
goto out;
|
|
|
|
memcpy(value, xattr->val, xattr->val_len);
|
|
|
|
out:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return err;
|
|
}
|
|
|
|
ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
|
|
u32 vir_namelen = 0;
|
|
u32 namelen;
|
|
int err;
|
|
u32 len;
|
|
int i;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
dout("listxattr %p ver=%lld index_ver=%lld\n", inode,
|
|
ci->i_xattrs.version, ci->i_xattrs.index_version);
|
|
|
|
if (__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1) &&
|
|
(ci->i_xattrs.index_version >= ci->i_xattrs.version)) {
|
|
goto list_xattr;
|
|
} else {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR);
|
|
if (err)
|
|
return err;
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
|
|
err = __build_xattrs(inode);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
list_xattr:
|
|
vir_namelen = 0;
|
|
/* include virtual dir xattrs */
|
|
if (vxattrs)
|
|
for (i = 0; vxattrs[i].name; i++)
|
|
vir_namelen += strlen(vxattrs[i].name) + 1;
|
|
/* adding 1 byte per each variable due to the null termination */
|
|
namelen = vir_namelen + ci->i_xattrs.names_size + ci->i_xattrs.count;
|
|
err = -ERANGE;
|
|
if (size && namelen > size)
|
|
goto out;
|
|
|
|
err = namelen;
|
|
if (size == 0)
|
|
goto out;
|
|
|
|
names = __copy_xattr_names(ci, names);
|
|
|
|
/* virtual xattr names, too */
|
|
if (vxattrs)
|
|
for (i = 0; vxattrs[i].name; i++) {
|
|
len = sprintf(names, "%s", vxattrs[i].name);
|
|
names += len + 1;
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return err;
|
|
}
|
|
|
|
static int ceph_sync_setxattr(struct dentry *dentry, 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 = dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct inode *parent_inode;
|
|
struct ceph_mds_request *req;
|
|
struct ceph_mds_client *mdsc = fsc->mdsc;
|
|
int err;
|
|
int i, nr_pages;
|
|
struct page **pages = NULL;
|
|
void *kaddr;
|
|
|
|
/* copy value into some pages */
|
|
nr_pages = calc_pages_for(0, size);
|
|
if (nr_pages) {
|
|
pages = kmalloc(sizeof(pages[0])*nr_pages, GFP_NOFS);
|
|
if (!pages)
|
|
return -ENOMEM;
|
|
err = -ENOMEM;
|
|
for (i = 0; i < nr_pages; i++) {
|
|
pages[i] = __page_cache_alloc(GFP_NOFS);
|
|
if (!pages[i]) {
|
|
nr_pages = i;
|
|
goto out;
|
|
}
|
|
kaddr = kmap(pages[i]);
|
|
memcpy(kaddr, value + i*PAGE_CACHE_SIZE,
|
|
min(PAGE_CACHE_SIZE, size-i*PAGE_CACHE_SIZE));
|
|
}
|
|
}
|
|
|
|
dout("setxattr value=%.*s\n", (int)size, value);
|
|
|
|
/* do request */
|
|
req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_SETXATTR,
|
|
USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
req->r_inode = inode;
|
|
ihold(inode);
|
|
req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
|
|
req->r_num_caps = 1;
|
|
req->r_args.setxattr.flags = cpu_to_le32(flags);
|
|
req->r_path2 = kstrdup(name, GFP_NOFS);
|
|
|
|
req->r_pages = pages;
|
|
req->r_num_pages = nr_pages;
|
|
req->r_data_len = size;
|
|
|
|
dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
|
|
parent_inode = ceph_get_dentry_parent_inode(dentry);
|
|
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
|
|
iput(parent_inode);
|
|
ceph_mdsc_put_request(req);
|
|
dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
|
|
|
|
out:
|
|
if (pages) {
|
|
for (i = 0; i < nr_pages; i++)
|
|
__free_page(pages[i]);
|
|
kfree(pages);
|
|
}
|
|
return err;
|
|
}
|
|
|
|
int ceph_setxattr(struct dentry *dentry, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
|
|
int err;
|
|
int name_len = strlen(name);
|
|
int val_len = size;
|
|
char *newname = NULL;
|
|
char *newval = NULL;
|
|
struct ceph_inode_xattr *xattr = NULL;
|
|
int issued;
|
|
int required_blob_size;
|
|
int dirty;
|
|
|
|
if (ceph_snap(inode) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
if (!ceph_is_valid_xattr(name))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (vxattrs) {
|
|
struct ceph_vxattr_cb *vxattr =
|
|
ceph_match_vxattr(vxattrs, name);
|
|
if (vxattr && vxattr->readonly)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
/* preallocate memory for xattr name, value, index node */
|
|
err = -ENOMEM;
|
|
newname = kmemdup(name, name_len + 1, GFP_NOFS);
|
|
if (!newname)
|
|
goto out;
|
|
|
|
if (val_len) {
|
|
newval = kmalloc(val_len + 1, GFP_NOFS);
|
|
if (!newval)
|
|
goto out;
|
|
memcpy(newval, value, val_len);
|
|
newval[val_len] = '\0';
|
|
}
|
|
|
|
xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
|
|
if (!xattr)
|
|
goto out;
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
retry:
|
|
issued = __ceph_caps_issued(ci, NULL);
|
|
if (!(issued & CEPH_CAP_XATTR_EXCL))
|
|
goto do_sync;
|
|
__build_xattrs(inode);
|
|
|
|
required_blob_size = __get_required_blob_size(ci, name_len, val_len);
|
|
|
|
if (!ci->i_xattrs.prealloc_blob ||
|
|
required_blob_size > ci->i_xattrs.prealloc_blob->alloc_len) {
|
|
struct ceph_buffer *blob = NULL;
|
|
|
|
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 out;
|
|
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;
|
|
}
|
|
|
|
dout("setxattr %p issued %s\n", inode, ceph_cap_string(issued));
|
|
err = __set_xattr(ci, newname, name_len, newval,
|
|
val_len, 1, 1, 1, &xattr);
|
|
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
|
|
ci->i_xattrs.dirty = true;
|
|
inode->i_ctime = CURRENT_TIME;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (dirty)
|
|
__mark_inode_dirty(inode, dirty);
|
|
return err;
|
|
|
|
do_sync:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
err = ceph_sync_setxattr(dentry, name, value, size, flags);
|
|
out:
|
|
kfree(newname);
|
|
kfree(newval);
|
|
kfree(xattr);
|
|
return err;
|
|
}
|
|
|
|
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 = dentry->d_inode;
|
|
struct inode *parent_inode;
|
|
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_inode = inode;
|
|
ihold(inode);
|
|
req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
|
|
req->r_num_caps = 1;
|
|
req->r_path2 = kstrdup(name, GFP_NOFS);
|
|
|
|
parent_inode = ceph_get_dentry_parent_inode(dentry);
|
|
err = ceph_mdsc_do_request(mdsc, parent_inode, req);
|
|
iput(parent_inode);
|
|
ceph_mdsc_put_request(req);
|
|
return err;
|
|
}
|
|
|
|
int ceph_removexattr(struct dentry *dentry, const char *name)
|
|
{
|
|
struct inode *inode = dentry->d_inode;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_vxattr_cb *vxattrs = ceph_inode_vxattrs(inode);
|
|
int issued;
|
|
int err;
|
|
int dirty;
|
|
|
|
if (ceph_snap(inode) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
if (!ceph_is_valid_xattr(name))
|
|
return -EOPNOTSUPP;
|
|
|
|
if (vxattrs) {
|
|
struct ceph_vxattr_cb *vxattr =
|
|
ceph_match_vxattr(vxattrs, name);
|
|
if (vxattr && vxattr->readonly)
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
__build_xattrs(inode);
|
|
issued = __ceph_caps_issued(ci, NULL);
|
|
dout("removexattr %p issued %s\n", inode, ceph_cap_string(issued));
|
|
|
|
if (!(issued & CEPH_CAP_XATTR_EXCL))
|
|
goto do_sync;
|
|
|
|
err = __remove_xattr_by_name(ceph_inode(inode), name);
|
|
dirty = __ceph_mark_dirty_caps(ci, CEPH_CAP_XATTR_EXCL);
|
|
ci->i_xattrs.dirty = true;
|
|
inode->i_ctime = CURRENT_TIME;
|
|
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
if (dirty)
|
|
__mark_inode_dirty(inode, dirty);
|
|
return err;
|
|
do_sync:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
err = ceph_send_removexattr(dentry, name);
|
|
return err;
|
|
}
|
|
|