/* * Copyright (C) 2008 Christoph Hellwig. * Portions Copyright (C) 2000-2008 Silicon Graphics, Inc. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write the Free Software Foundation, * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */ #include "xfs.h" #include "xfs_format.h" #include "xfs_log_format.h" #include "xfs_trans_resv.h" #include "xfs_mount.h" #include "xfs_da_format.h" #include "xfs_inode.h" #include "xfs_attr.h" #include "xfs_attr_leaf.h" #include "xfs_acl.h" #include #include static int xfs_xattr_get(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, void *value, size_t size) { int xflags = handler->flags; struct xfs_inode *ip = XFS_I(inode); int error, asize = size; /* Convert Linux syscall to XFS internal ATTR flags */ if (!size) { xflags |= ATTR_KERNOVAL; value = NULL; } error = xfs_attr_get(ip, (unsigned char *)name, value, &asize, xflags); if (error) return error; return asize; } void xfs_forget_acl( struct inode *inode, const char *name, int xflags) { /* * Invalidate any cached ACLs if the user has bypassed the ACL * interface. We don't validate the content whatsoever so it is caller * responsibility to provide data in valid format and ensure i_mode is * consistent. */ if (xflags & ATTR_ROOT) { #ifdef CONFIG_XFS_POSIX_ACL if (!strcmp(name, SGI_ACL_FILE)) forget_cached_acl(inode, ACL_TYPE_ACCESS); else if (!strcmp(name, SGI_ACL_DEFAULT)) forget_cached_acl(inode, ACL_TYPE_DEFAULT); #endif } } static int xfs_xattr_set(const struct xattr_handler *handler, struct dentry *unused, struct inode *inode, const char *name, const void *value, size_t size, int flags) { int xflags = handler->flags; struct xfs_inode *ip = XFS_I(inode); int error; /* Convert Linux syscall to XFS internal ATTR flags */ if (flags & XATTR_CREATE) xflags |= ATTR_CREATE; if (flags & XATTR_REPLACE) xflags |= ATTR_REPLACE; if (!value) return xfs_attr_remove(ip, (unsigned char *)name, xflags); error = xfs_attr_set(ip, (unsigned char *)name, (void *)value, size, xflags); if (!error) xfs_forget_acl(inode, name, xflags); return error; } static const struct xattr_handler xfs_xattr_user_handler = { .prefix = XATTR_USER_PREFIX, .flags = 0, /* no flags implies user namespace */ .get = xfs_xattr_get, .set = xfs_xattr_set, }; static const struct xattr_handler xfs_xattr_trusted_handler = { .prefix = XATTR_TRUSTED_PREFIX, .flags = ATTR_ROOT, .get = xfs_xattr_get, .set = xfs_xattr_set, }; static const struct xattr_handler xfs_xattr_security_handler = { .prefix = XATTR_SECURITY_PREFIX, .flags = ATTR_SECURE, .get = xfs_xattr_get, .set = xfs_xattr_set, }; const struct xattr_handler *xfs_xattr_handlers[] = { &xfs_xattr_user_handler, &xfs_xattr_trusted_handler, &xfs_xattr_security_handler, #ifdef CONFIG_XFS_POSIX_ACL &posix_acl_access_xattr_handler, &posix_acl_default_xattr_handler, #endif NULL }; static void __xfs_xattr_put_listent( struct xfs_attr_list_context *context, char *prefix, int prefix_len, unsigned char *name, int namelen) { char *offset; int arraytop; if (!context->alist) goto compute_size; arraytop = context->count + prefix_len + namelen + 1; if (arraytop > context->firstu) { context->count = -1; /* insufficient space */ context->seen_enough = 1; return; } offset = (char *)context->alist + context->count; strncpy(offset, prefix, prefix_len); offset += prefix_len; strncpy(offset, (char *)name, namelen); /* real name */ offset += namelen; *offset = '\0'; compute_size: context->count += prefix_len + namelen + 1; return; } static void xfs_xattr_put_listent( struct xfs_attr_list_context *context, int flags, unsigned char *name, int namelen, int valuelen) { char *prefix; int prefix_len; ASSERT(context->count >= 0); if (flags & XFS_ATTR_ROOT) { #ifdef CONFIG_XFS_POSIX_ACL if (namelen == SGI_ACL_FILE_SIZE && strncmp(name, SGI_ACL_FILE, SGI_ACL_FILE_SIZE) == 0) { __xfs_xattr_put_listent( context, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN, XATTR_POSIX_ACL_ACCESS, strlen(XATTR_POSIX_ACL_ACCESS)); } else if (namelen == SGI_ACL_DEFAULT_SIZE && strncmp(name, SGI_ACL_DEFAULT, SGI_ACL_DEFAULT_SIZE) == 0) { __xfs_xattr_put_listent( context, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN, XATTR_POSIX_ACL_DEFAULT, strlen(XATTR_POSIX_ACL_DEFAULT)); } #endif /* * Only show root namespace entries if we are actually allowed to * see them. */ if (!capable(CAP_SYS_ADMIN)) return; prefix = XATTR_TRUSTED_PREFIX; prefix_len = XATTR_TRUSTED_PREFIX_LEN; } else if (flags & XFS_ATTR_SECURE) { prefix = XATTR_SECURITY_PREFIX; prefix_len = XATTR_SECURITY_PREFIX_LEN; } else { prefix = XATTR_USER_PREFIX; prefix_len = XATTR_USER_PREFIX_LEN; } __xfs_xattr_put_listent(context, prefix, prefix_len, name, namelen); return; } ssize_t xfs_vn_listxattr( struct dentry *dentry, char *data, size_t size) { struct xfs_attr_list_context context; struct attrlist_cursor_kern cursor = { 0 }; struct inode *inode = d_inode(dentry); int error; /* * First read the regular on-disk attributes. */ memset(&context, 0, sizeof(context)); context.dp = XFS_I(inode); context.cursor = &cursor; context.resynch = 1; context.alist = size ? data : NULL; context.bufsize = size; context.firstu = context.bufsize; context.put_listent = xfs_xattr_put_listent; error = xfs_attr_list_int(&context); if (error) return error; if (context.count < 0) return -ERANGE; return context.count; } p;id2=0c744ea4f77d72b3dcebb7a8f2684633ec79be88'>diff)
tracing: Fix hwlat kthread migration
The hwlat tracer creates a kernel thread at start of the tracer. It is pinned to a single CPU and will move to the next CPU after each period of running. If the user modifies the migration thread's affinity, it will not change after that happens. The original code created the thread at the first instance it was called, but later was changed to destroy the thread after the tracer was finished, and would not be created until the next instance of the tracer was established. The code that initialized the affinity was only called on the initial instantiation of the tracer. After that, it was not initialized, and the previous affinity did not match the current newly created one, making it appear that the user modified the thread's affinity when it did not, and the thread failed to migrate again. Cc: stable@vger.kernel.org Fixes: 0330f7aa8ee6 ("tracing: Have hwlat trace migrate across tracing_cpumask CPUs") Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'include/soc/imx')