mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-24 21:24:00 +08:00
d102a56edb
Pull vfs fixes from Al Viro: "Followups to the parallel lookup work: - update docs - restore killability of the places that used to take ->i_mutex killably now that we have down_write_killable() merged - Additionally, it turns out that I missed a prerequisite for security_d_instantiate() stuff - ->getxattr() wasn't the only thing that could be called before dentry is attached to inode; with smack we needed the same treatment applied to ->setxattr() as well" * 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: switch ->setxattr() to passing dentry and inode separately switch xattr_handler->set() to passing dentry and inode separately restore killability of old mutex_lock_killable(&inode->i_mutex) users add down_write_killable_nested() update D/f/directory-locking
1095 lines
27 KiB
C
1095 lines
27 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include <linux/ceph/pagelist.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/posix_acl_xattr.h>
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#include <linux/slab.h>
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#define XATTR_CEPH_PREFIX "ceph."
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#define XATTR_CEPH_PREFIX_LEN (sizeof (XATTR_CEPH_PREFIX) - 1)
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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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const struct xattr_handler ceph_other_xattr_handler;
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/*
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* List of handlers for synthetic system.* attributes. Other
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* attributes are handled directly.
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*/
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const struct xattr_handler *ceph_xattr_handlers[] = {
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#ifdef CONFIG_CEPH_FS_POSIX_ACL
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&posix_acl_access_xattr_handler,
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&posix_acl_default_xattr_handler,
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#endif
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&ceph_other_xattr_handler,
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NULL,
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};
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static bool ceph_is_valid_xattr(const char *name)
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{
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return !strncmp(name, XATTR_CEPH_PREFIX, XATTR_CEPH_PREFIX_LEN) ||
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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 {
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char *name;
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size_t name_size; /* strlen(name) + 1 (for '\0') */
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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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bool readonly, hidden;
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bool (*exists_cb)(struct ceph_inode_info *ci);
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};
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/* layouts */
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static bool ceph_vxattrcb_layout_exists(struct ceph_inode_info *ci)
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{
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size_t s;
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char *p = (char *)&ci->i_layout;
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for (s = 0; s < sizeof(ci->i_layout); s++, p++)
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if (*p)
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return true;
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return false;
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}
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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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struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
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struct ceph_osd_client *osdc = &fsc->client->osdc;
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s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
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const char *pool_name;
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char buf[128];
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dout("ceph_vxattrcb_layout %p\n", &ci->vfs_inode);
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down_read(&osdc->lock);
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pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
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if (pool_name) {
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size_t len = strlen(pool_name);
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ret = snprintf(buf, sizeof(buf),
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"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=",
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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 (!size) {
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ret += len;
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} else if (ret + len > size) {
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ret = -ERANGE;
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} else {
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memcpy(val, buf, ret);
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memcpy(val + ret, pool_name, len);
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ret += len;
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}
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} else {
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ret = snprintf(buf, sizeof(buf),
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"stripe_unit=%lld stripe_count=%lld object_size=%lld pool=%lld",
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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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(unsigned long long)pool);
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if (size) {
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if (ret <= size)
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memcpy(val, buf, ret);
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else
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ret = -ERANGE;
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}
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}
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up_read(&osdc->lock);
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return ret;
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}
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static size_t ceph_vxattrcb_layout_stripe_unit(struct ceph_inode_info *ci,
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char *val, size_t size)
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{
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return snprintf(val, size, "%lld",
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(unsigned long long)ceph_file_layout_su(ci->i_layout));
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}
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static size_t ceph_vxattrcb_layout_stripe_count(struct ceph_inode_info *ci,
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char *val, size_t size)
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{
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return snprintf(val, size, "%lld",
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(unsigned long long)ceph_file_layout_stripe_count(ci->i_layout));
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}
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static size_t ceph_vxattrcb_layout_object_size(struct ceph_inode_info *ci,
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char *val, size_t size)
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{
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return snprintf(val, size, "%lld",
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(unsigned long long)ceph_file_layout_object_size(ci->i_layout));
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}
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static size_t ceph_vxattrcb_layout_pool(struct ceph_inode_info *ci,
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char *val, size_t size)
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{
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int ret;
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struct ceph_fs_client *fsc = ceph_sb_to_client(ci->vfs_inode.i_sb);
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struct ceph_osd_client *osdc = &fsc->client->osdc;
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s64 pool = ceph_file_layout_pg_pool(ci->i_layout);
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const char *pool_name;
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down_read(&osdc->lock);
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pool_name = ceph_pg_pool_name_by_id(osdc->osdmap, pool);
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if (pool_name)
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ret = snprintf(val, size, "%s", pool_name);
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else
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ret = snprintf(val, size, "%lld", (unsigned long long)pool);
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up_read(&osdc->lock);
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return ret;
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}
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/* directories */
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static size_t ceph_vxattrcb_dir_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_dir_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_dir_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_dir_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_dir_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_dir_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_dir_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_dir_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.09%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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#define CEPH_XATTR_NAME(_type, _name) XATTR_CEPH_PREFIX #_type "." #_name
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#define CEPH_XATTR_NAME2(_type, _name, _name2) \
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XATTR_CEPH_PREFIX #_type "." #_name "." #_name2
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#define XATTR_NAME_CEPH(_type, _name) \
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{ \
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.name = CEPH_XATTR_NAME(_type, _name), \
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.name_size = sizeof (CEPH_XATTR_NAME(_type, _name)), \
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.getxattr_cb = ceph_vxattrcb_ ## _type ## _ ## _name, \
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.readonly = true, \
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.hidden = false, \
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.exists_cb = NULL, \
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}
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#define XATTR_LAYOUT_FIELD(_type, _name, _field) \
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{ \
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.name = CEPH_XATTR_NAME2(_type, _name, _field), \
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.name_size = sizeof (CEPH_XATTR_NAME2(_type, _name, _field)), \
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.getxattr_cb = ceph_vxattrcb_ ## _name ## _ ## _field, \
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.readonly = false, \
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.hidden = true, \
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.exists_cb = ceph_vxattrcb_layout_exists, \
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}
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static struct ceph_vxattr ceph_dir_vxattrs[] = {
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{
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.name = "ceph.dir.layout",
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.name_size = sizeof("ceph.dir.layout"),
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.getxattr_cb = ceph_vxattrcb_layout,
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.readonly = false,
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.hidden = true,
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.exists_cb = ceph_vxattrcb_layout_exists,
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},
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XATTR_LAYOUT_FIELD(dir, layout, stripe_unit),
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XATTR_LAYOUT_FIELD(dir, layout, stripe_count),
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XATTR_LAYOUT_FIELD(dir, layout, object_size),
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XATTR_LAYOUT_FIELD(dir, layout, pool),
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XATTR_NAME_CEPH(dir, entries),
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XATTR_NAME_CEPH(dir, files),
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XATTR_NAME_CEPH(dir, subdirs),
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XATTR_NAME_CEPH(dir, rentries),
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XATTR_NAME_CEPH(dir, rfiles),
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XATTR_NAME_CEPH(dir, rsubdirs),
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XATTR_NAME_CEPH(dir, rbytes),
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XATTR_NAME_CEPH(dir, rctime),
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{ .name = NULL, 0 } /* Required table terminator */
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};
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static size_t ceph_dir_vxattrs_name_size; /* total size of all names */
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/* files */
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static struct ceph_vxattr ceph_file_vxattrs[] = {
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{
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.name = "ceph.file.layout",
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.name_size = sizeof("ceph.file.layout"),
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.getxattr_cb = ceph_vxattrcb_layout,
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.readonly = false,
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.hidden = true,
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.exists_cb = ceph_vxattrcb_layout_exists,
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},
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XATTR_LAYOUT_FIELD(file, layout, stripe_unit),
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XATTR_LAYOUT_FIELD(file, layout, stripe_count),
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XATTR_LAYOUT_FIELD(file, layout, object_size),
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XATTR_LAYOUT_FIELD(file, layout, pool),
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{ .name = NULL, 0 } /* Required table terminator */
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};
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static size_t ceph_file_vxattrs_name_size; /* total size of all names */
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static struct ceph_vxattr *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 size_t ceph_vxattrs_name_size(struct ceph_vxattr *vxattrs)
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{
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if (vxattrs == ceph_dir_vxattrs)
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return ceph_dir_vxattrs_name_size;
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if (vxattrs == ceph_file_vxattrs)
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return ceph_file_vxattrs_name_size;
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BUG_ON(vxattrs);
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return 0;
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}
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/*
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* Compute the aggregate size (including terminating '\0') of all
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* virtual extended attribute names in the given vxattr table.
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*/
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static size_t __init vxattrs_name_size(struct ceph_vxattr *vxattrs)
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{
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struct ceph_vxattr *vxattr;
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size_t size = 0;
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for (vxattr = vxattrs; vxattr->name; vxattr++)
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if (!vxattr->hidden)
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size += vxattr->name_size;
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return size;
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}
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/* Routines called at initialization and exit time */
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void __init ceph_xattr_init(void)
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{
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ceph_dir_vxattrs_name_size = vxattrs_name_size(ceph_dir_vxattrs);
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ceph_file_vxattrs_name_size = vxattrs_name_size(ceph_file_vxattrs);
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}
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void ceph_xattr_exit(void)
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{
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ceph_dir_vxattrs_name_size = 0;
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ceph_file_vxattrs_name_size = 0;
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}
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static struct ceph_vxattr *ceph_match_vxattr(struct inode *inode,
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const char *name)
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{
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struct ceph_vxattr *vxattr = ceph_inode_vxattrs(inode);
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if (vxattr) {
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while (vxattr->name) {
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if (!strcmp(vxattr->name, name))
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return vxattr;
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vxattr++;
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}
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}
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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 flags, int update_xattr,
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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 (update_xattr) {
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int err = 0;
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if (xattr && (flags & XATTR_CREATE))
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err = -EEXIST;
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else if (!xattr && (flags & XATTR_REPLACE))
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err = -ENODATA;
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if (err) {
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kfree(name);
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kfree(val);
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return err;
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}
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if (update_xattr < 0) {
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if (xattr)
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__remove_xattr(ci, xattr);
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kfree(name);
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return 0;
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}
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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 = update_xattr;
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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 (update_xattr) {
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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 = update_xattr;
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xattr->should_free_val = (val && update_xattr);
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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)
|
|
{
|
|
BUG_ON(!xattr);
|
|
|
|
if (xattr->should_free_name)
|
|
kfree((void *)xattr->name);
|
|
if (xattr->should_free_val)
|
|
kfree((void *)xattr->val);
|
|
|
|
kfree(xattr);
|
|
}
|
|
|
|
static int __remove_xattr(struct ceph_inode_info *ci,
|
|
struct ceph_inode_xattr *xattr)
|
|
{
|
|
if (!xattr)
|
|
return -ENODATA;
|
|
|
|
rb_erase(&xattr->node, &ci->i_xattrs.index);
|
|
|
|
if (xattr->should_free_name)
|
|
kfree((void *)xattr->name);
|
|
if (xattr->should_free_val)
|
|
kfree((void *)xattr->val);
|
|
|
|
ci->i_xattrs.names_size -= xattr->name_len;
|
|
ci->i_xattrs.vals_size -= xattr->val_len;
|
|
ci->i_xattrs.count--;
|
|
kfree(xattr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static char *__copy_xattr_names(struct ceph_inode_info *ci,
|
|
char *dest)
|
|
{
|
|
struct rb_node *p;
|
|
struct ceph_inode_xattr *xattr = NULL;
|
|
|
|
p = rb_first(&ci->i_xattrs.index);
|
|
dout("__copy_xattr_names count=%d\n", ci->i_xattrs.count);
|
|
|
|
while (p) {
|
|
xattr = rb_entry(p, struct ceph_inode_xattr, node);
|
|
memcpy(dest, xattr->name, xattr->name_len);
|
|
dest[xattr->name_len] = '\0';
|
|
|
|
dout("dest=%s %p (%s) (%d/%d)\n", dest, xattr, xattr->name,
|
|
xattr->name_len, ci->i_xattrs.names_size);
|
|
|
|
dest += xattr->name_len + 1;
|
|
p = rb_next(p);
|
|
}
|
|
|
|
return dest;
|
|
}
|
|
|
|
void __ceph_destroy_xattrs(struct ceph_inode_info *ci)
|
|
{
|
|
struct rb_node *p, *tmp;
|
|
struct ceph_inode_xattr *xattr = NULL;
|
|
|
|
p = rb_first(&ci->i_xattrs.index);
|
|
|
|
dout("__ceph_destroy_xattrs p=%p\n", p);
|
|
|
|
while (p) {
|
|
xattr = rb_entry(p, struct ceph_inode_xattr, node);
|
|
tmp = p;
|
|
p = rb_next(tmp);
|
|
dout("__ceph_destroy_xattrs next p=%p (%.*s)\n", p,
|
|
xattr->name_len, xattr->name);
|
|
rb_erase(tmp, &ci->i_xattrs.index);
|
|
|
|
__free_xattr(xattr);
|
|
}
|
|
|
|
ci->i_xattrs.names_size = 0;
|
|
ci->i_xattrs.vals_size = 0;
|
|
ci->i_xattrs.index_version = 0;
|
|
ci->i_xattrs.count = 0;
|
|
ci->i_xattrs.index = RB_ROOT;
|
|
}
|
|
|
|
static int __build_xattrs(struct inode *inode)
|
|
__releases(ci->i_ceph_lock)
|
|
__acquires(ci->i_ceph_lock)
|
|
{
|
|
u32 namelen;
|
|
u32 numattr = 0;
|
|
void *p, *end;
|
|
u32 len;
|
|
const char *name, *val;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
int xattr_version;
|
|
struct ceph_inode_xattr **xattrs = NULL;
|
|
int err = 0;
|
|
int i;
|
|
|
|
dout("__build_xattrs() len=%d\n",
|
|
ci->i_xattrs.blob ? (int)ci->i_xattrs.blob->vec.iov_len : 0);
|
|
|
|
if (ci->i_xattrs.index_version >= ci->i_xattrs.version)
|
|
return 0; /* already built */
|
|
|
|
__ceph_destroy_xattrs(ci);
|
|
|
|
start:
|
|
/* updated internal xattr rb tree */
|
|
if (ci->i_xattrs.blob && ci->i_xattrs.blob->vec.iov_len > 4) {
|
|
p = ci->i_xattrs.blob->vec.iov_base;
|
|
end = p + ci->i_xattrs.blob->vec.iov_len;
|
|
ceph_decode_32_safe(&p, end, numattr, bad);
|
|
xattr_version = ci->i_xattrs.version;
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
xattrs = kcalloc(numattr, sizeof(struct ceph_inode_xattr *),
|
|
GFP_NOFS);
|
|
err = -ENOMEM;
|
|
if (!xattrs)
|
|
goto bad_lock;
|
|
|
|
for (i = 0; i < numattr; i++) {
|
|
xattrs[i] = kmalloc(sizeof(struct ceph_inode_xattr),
|
|
GFP_NOFS);
|
|
if (!xattrs[i])
|
|
goto bad_lock;
|
|
}
|
|
|
|
spin_lock(&ci->i_ceph_lock);
|
|
if (ci->i_xattrs.version != xattr_version) {
|
|
/* lost a race, retry */
|
|
for (i = 0; i < numattr; i++)
|
|
kfree(xattrs[i]);
|
|
kfree(xattrs);
|
|
xattrs = NULL;
|
|
goto start;
|
|
}
|
|
err = -EIO;
|
|
while (numattr--) {
|
|
ceph_decode_32_safe(&p, end, len, bad);
|
|
namelen = len;
|
|
name = p;
|
|
p += len;
|
|
ceph_decode_32_safe(&p, end, len, bad);
|
|
val = p;
|
|
p += len;
|
|
|
|
err = __set_xattr(ci, name, namelen, val, len,
|
|
0, 0, &xattrs[numattr]);
|
|
|
|
if (err < 0)
|
|
goto bad;
|
|
}
|
|
kfree(xattrs);
|
|
}
|
|
ci->i_xattrs.index_version = ci->i_xattrs.version;
|
|
ci->i_xattrs.dirty = false;
|
|
|
|
return err;
|
|
bad_lock:
|
|
spin_lock(&ci->i_ceph_lock);
|
|
bad:
|
|
if (xattrs) {
|
|
for (i = 0; i < numattr; i++)
|
|
kfree(xattrs[i]);
|
|
kfree(xattrs);
|
|
}
|
|
ci->i_xattrs.names_size = 0;
|
|
return err;
|
|
}
|
|
|
|
static int __get_required_blob_size(struct ceph_inode_info *ci, int name_size,
|
|
int val_size)
|
|
{
|
|
/*
|
|
* 4 bytes for the length, and additional 4 bytes per each xattr name,
|
|
* 4 bytes per each value
|
|
*/
|
|
int size = 4 + ci->i_xattrs.count*(4 + 4) +
|
|
ci->i_xattrs.names_size +
|
|
ci->i_xattrs.vals_size;
|
|
dout("__get_required_blob_size c=%d names.size=%d vals.size=%d\n",
|
|
ci->i_xattrs.count, ci->i_xattrs.names_size,
|
|
ci->i_xattrs.vals_size);
|
|
|
|
if (name_size)
|
|
size += 4 + 4 + name_size + val_size;
|
|
|
|
return size;
|
|
}
|
|
|
|
/*
|
|
* If there are dirty xattrs, reencode xattrs into the prealloc_blob
|
|
* and swap into place.
|
|
*/
|
|
void __ceph_build_xattrs_blob(struct ceph_inode_info *ci)
|
|
{
|
|
struct rb_node *p;
|
|
struct ceph_inode_xattr *xattr = NULL;
|
|
void *dest;
|
|
|
|
dout("__build_xattrs_blob %p\n", &ci->vfs_inode);
|
|
if (ci->i_xattrs.dirty) {
|
|
int need = __get_required_blob_size(ci, 0, 0);
|
|
|
|
BUG_ON(need > ci->i_xattrs.prealloc_blob->alloc_len);
|
|
|
|
p = rb_first(&ci->i_xattrs.index);
|
|
dest = ci->i_xattrs.prealloc_blob->vec.iov_base;
|
|
|
|
ceph_encode_32(&dest, ci->i_xattrs.count);
|
|
while (p) {
|
|
xattr = rb_entry(p, struct ceph_inode_xattr, node);
|
|
|
|
ceph_encode_32(&dest, xattr->name_len);
|
|
memcpy(dest, xattr->name, xattr->name_len);
|
|
dest += xattr->name_len;
|
|
ceph_encode_32(&dest, xattr->val_len);
|
|
memcpy(dest, xattr->val, xattr->val_len);
|
|
dest += xattr->val_len;
|
|
|
|
p = rb_next(p);
|
|
}
|
|
|
|
/* 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++;
|
|
}
|
|
}
|
|
|
|
static inline int __get_request_mask(struct inode *in) {
|
|
struct ceph_mds_request *req = current->journal_info;
|
|
int mask = 0;
|
|
if (req && req->r_target_inode == in) {
|
|
if (req->r_op == CEPH_MDS_OP_LOOKUP ||
|
|
req->r_op == CEPH_MDS_OP_LOOKUPINO ||
|
|
req->r_op == CEPH_MDS_OP_LOOKUPPARENT ||
|
|
req->r_op == CEPH_MDS_OP_GETATTR) {
|
|
mask = le32_to_cpu(req->r_args.getattr.mask);
|
|
} else if (req->r_op == CEPH_MDS_OP_OPEN ||
|
|
req->r_op == CEPH_MDS_OP_CREATE) {
|
|
mask = le32_to_cpu(req->r_args.open.mask);
|
|
}
|
|
}
|
|
return mask;
|
|
}
|
|
|
|
ssize_t __ceph_getxattr(struct inode *inode, const char *name, void *value,
|
|
size_t size)
|
|
{
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_inode_xattr *xattr;
|
|
struct ceph_vxattr *vxattr = NULL;
|
|
int req_mask;
|
|
int err;
|
|
|
|
/* let's see if a virtual xattr was requested */
|
|
vxattr = ceph_match_vxattr(inode, name);
|
|
if (vxattr) {
|
|
err = -ENODATA;
|
|
if (!(vxattr->exists_cb && !vxattr->exists_cb(ci)))
|
|
err = vxattr->getxattr_cb(ci, value, size);
|
|
return err;
|
|
}
|
|
|
|
req_mask = __get_request_mask(inode);
|
|
|
|
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 (ci->i_xattrs.version == 0 ||
|
|
!((req_mask & CEPH_CAP_XATTR_SHARED) ||
|
|
__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1))) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
|
|
/* security module gets xattr while filling trace */
|
|
if (current->journal_info != NULL) {
|
|
pr_warn_ratelimited("sync getxattr %p "
|
|
"during filling trace\n", inode);
|
|
return -EBUSY;
|
|
}
|
|
|
|
/* get xattrs from mds (if we don't already have them) */
|
|
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
|
|
if (err)
|
|
return err;
|
|
spin_lock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
err = __build_xattrs(inode);
|
|
if (err < 0)
|
|
goto out;
|
|
|
|
err = -ENODATA; /* == ENOATTR */
|
|
xattr = __get_xattr(ci, name);
|
|
if (!xattr)
|
|
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);
|
|
|
|
if (current->journal_info != NULL &&
|
|
!strncmp(name, XATTR_SECURITY_PREFIX, XATTR_SECURITY_PREFIX_LEN))
|
|
ci->i_ceph_flags |= CEPH_I_SEC_INITED;
|
|
out:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return err;
|
|
}
|
|
|
|
ssize_t ceph_listxattr(struct dentry *dentry, char *names, size_t size)
|
|
{
|
|
struct inode *inode = d_inode(dentry);
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_vxattr *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 (ci->i_xattrs.version == 0 ||
|
|
!__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 1)) {
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
err = ceph_do_getattr(inode, CEPH_STAT_CAP_XATTR, true);
|
|
if (err)
|
|
return err;
|
|
spin_lock(&ci->i_ceph_lock);
|
|
}
|
|
|
|
err = __build_xattrs(inode);
|
|
if (err < 0)
|
|
goto out;
|
|
/*
|
|
* Start with virtual dir xattr names (if any) (including
|
|
* terminating '\0' characters for each).
|
|
*/
|
|
vir_namelen = ceph_vxattrs_name_size(vxattrs);
|
|
|
|
/* adding 1 byte per each variable due to the null termination */
|
|
namelen = ci->i_xattrs.names_size + ci->i_xattrs.count;
|
|
err = -ERANGE;
|
|
if (size && vir_namelen + namelen > size)
|
|
goto out;
|
|
|
|
err = namelen + vir_namelen;
|
|
if (size == 0)
|
|
goto out;
|
|
|
|
names = __copy_xattr_names(ci, names);
|
|
|
|
/* virtual xattr names, too */
|
|
err = namelen;
|
|
if (vxattrs) {
|
|
for (i = 0; vxattrs[i].name; i++) {
|
|
if (!vxattrs[i].hidden &&
|
|
!(vxattrs[i].exists_cb &&
|
|
!vxattrs[i].exists_cb(ci))) {
|
|
len = sprintf(names, "%s", vxattrs[i].name);
|
|
names += len + 1;
|
|
err += len + 1;
|
|
}
|
|
}
|
|
}
|
|
|
|
out:
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return err;
|
|
}
|
|
|
|
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(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) {
|
|
/* copy value into pagelist */
|
|
pagelist = kmalloc(sizeof(*pagelist), GFP_NOFS);
|
|
if (!pagelist)
|
|
return -ENOMEM;
|
|
|
|
ceph_pagelist_init(pagelist);
|
|
err = ceph_pagelist_append(pagelist, value, size);
|
|
if (err)
|
|
goto out;
|
|
} else if (!value) {
|
|
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, op, USE_AUTH_MDS);
|
|
if (IS_ERR(req)) {
|
|
err = PTR_ERR(req);
|
|
goto out;
|
|
}
|
|
|
|
req->r_path2 = kstrdup(name, GFP_NOFS);
|
|
if (!req->r_path2) {
|
|
ceph_mdsc_put_request(req);
|
|
err = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
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);
|
|
req->r_num_caps = 1;
|
|
req->r_inode_drop = CEPH_CAP_XATTR_SHARED;
|
|
|
|
dout("xattr.ver (before): %lld\n", ci->i_xattrs.version);
|
|
err = ceph_mdsc_do_request(mdsc, NULL, req);
|
|
ceph_mdsc_put_request(req);
|
|
dout("xattr.ver (after): %lld\n", ci->i_xattrs.version);
|
|
|
|
out:
|
|
if (pagelist)
|
|
ceph_pagelist_release(pagelist);
|
|
return err;
|
|
}
|
|
|
|
int __ceph_setxattr(struct inode *inode, const char *name,
|
|
const void *value, size_t size, int flags)
|
|
{
|
|
struct ceph_vxattr *vxattr;
|
|
struct ceph_inode_info *ci = ceph_inode(inode);
|
|
struct ceph_mds_client *mdsc = ceph_sb_to_client(inode->i_sb)->mdsc;
|
|
struct ceph_cap_flush *prealloc_cf = NULL;
|
|
int issued;
|
|
int err;
|
|
int dirty = 0;
|
|
int name_len = strlen(name);
|
|
int val_len = size;
|
|
char *newname = NULL;
|
|
char *newval = NULL;
|
|
struct ceph_inode_xattr *xattr = NULL;
|
|
int required_blob_size;
|
|
bool lock_snap_rwsem = false;
|
|
|
|
if (ceph_snap(inode) != CEPH_NOSNAP)
|
|
return -EROFS;
|
|
|
|
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;
|
|
|
|
/* 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 = kmemdup(value, val_len, GFP_NOFS);
|
|
if (!newval)
|
|
goto out;
|
|
}
|
|
|
|
xattr = kmalloc(sizeof(struct ceph_inode_xattr), GFP_NOFS);
|
|
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);
|
|
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);
|
|
|
|
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 = __set_xattr(ci, newname, name_len, newval, val_len,
|
|
flags, value ? 1 : -1, &xattr);
|
|
|
|
if (!err) {
|
|
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);
|
|
|
|
/* security module set xattr while filling trace */
|
|
if (current->journal_info != NULL) {
|
|
pr_warn_ratelimited("sync setxattr %p "
|
|
"during filling trace\n", inode);
|
|
err = -EBUSY;
|
|
} else {
|
|
err = ceph_sync_setxattr(inode, name, value, size, flags);
|
|
}
|
|
out:
|
|
ceph_free_cap_flush(prealloc_cf);
|
|
kfree(newname);
|
|
kfree(newval);
|
|
kfree(xattr);
|
|
return err;
|
|
}
|
|
|
|
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_is_valid_xattr(name))
|
|
return -EOPNOTSUPP;
|
|
return __ceph_getxattr(inode, name, value, size);
|
|
}
|
|
|
|
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)
|
|
{
|
|
if (!ceph_is_valid_xattr(name))
|
|
return -EOPNOTSUPP;
|
|
return __ceph_setxattr(inode, name, value, size, flags);
|
|
}
|
|
|
|
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)
|
|
{
|
|
return in->i_security != NULL;
|
|
}
|
|
|
|
bool ceph_security_xattr_deadlock(struct inode *in)
|
|
{
|
|
struct ceph_inode_info *ci;
|
|
bool ret;
|
|
if (in->i_security == NULL)
|
|
return false;
|
|
ci = ceph_inode(in);
|
|
spin_lock(&ci->i_ceph_lock);
|
|
ret = !(ci->i_ceph_flags & CEPH_I_SEC_INITED) &&
|
|
!(ci->i_xattrs.version > 0 &&
|
|
__ceph_caps_issued_mask(ci, CEPH_CAP_XATTR_SHARED, 0));
|
|
spin_unlock(&ci->i_ceph_lock);
|
|
return ret;
|
|
}
|
|
#endif
|