/* * (C) 2001 Clemson University and The University of Chicago * * See COPYING in top-level directory. */ /* * Implementation of dentry (directory cache) functions. */ #include "protocol.h" #include "orangefs-kernel.h" /* Returns 1 if dentry can still be trusted, else 0. */ static int orangefs_revalidate_lookup(struct dentry *dentry) { struct dentry *parent_dentry = dget_parent(dentry); struct inode *parent_inode = parent_dentry->d_inode; struct orangefs_inode_s *parent = ORANGEFS_I(parent_inode); struct inode *inode = dentry->d_inode; struct orangefs_kernel_op_s *new_op; int ret = 0; int err = 0; gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: attempting lookup.\n", __func__); new_op = op_alloc(ORANGEFS_VFS_OP_LOOKUP); if (!new_op) goto out_put_parent; new_op->upcall.req.lookup.sym_follow = ORANGEFS_LOOKUP_LINK_NO_FOLLOW; new_op->upcall.req.lookup.parent_refn = parent->refn; strncpy(new_op->upcall.req.lookup.d_name, dentry->d_name.name, ORANGEFS_NAME_MAX); gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d interrupt flag [%d]\n", __FILE__, __func__, __LINE__, get_interruptible_flag(parent_inode)); err = service_operation(new_op, "orangefs_lookup", get_interruptible_flag(parent_inode)); /* Positive dentry: reject if error or not the same inode. */ if (inode) { if (err) { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d lookup failure.\n", __FILE__, __func__, __LINE__); goto out_drop; } if (!match_handle(new_op->downcall.resp.lookup.refn.khandle, inode)) { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d no match.\n", __FILE__, __func__, __LINE__); goto out_drop; } /* Negative dentry: reject if success or error other than ENOENT. */ } else { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry.\n", __func__); if (!err || err != -ENOENT) { if (new_op->downcall.status != 0) gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d lookup failure.\n", __FILE__, __func__, __LINE__); goto out_drop; } } orangefs_set_timeout(dentry); ret = 1; out_release_op: op_release(new_op); out_put_parent: dput(parent_dentry); return ret; out_drop: gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d revalidate failed\n", __FILE__, __func__, __LINE__); goto out_release_op; } /* * Verify that dentry is valid. * * Should return 1 if dentry can still be trusted, else 0. */ static int orangefs_d_revalidate(struct dentry *dentry, unsigned int flags) { int ret; unsigned long time = (unsigned long) dentry->d_fsdata; if (time_before(jiffies, time)) return 1; if (flags & LOOKUP_RCU) return -ECHILD; gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: called on dentry %p.\n", __func__, dentry); /* skip root handle lookups. */ if (dentry->d_inode && is_root_handle(dentry->d_inode)) return 1; /* * If this passes, the positive dentry still exists or the negative * dentry still does not exist. */ if (!orangefs_revalidate_lookup(dentry)) return 0; /* We do not need to continue with negative dentries. */ if (!dentry->d_inode) goto out; /* Now we must perform a getattr to validate the inode contents. */ ret = orangefs_inode_check_changed(dentry->d_inode); if (ret < 0) { gossip_debug(GOSSIP_DCACHE_DEBUG, "%s:%s:%d getattr failure.\n", __FILE__, __func__, __LINE__); return 0; } if (ret == 0) return 0; out: gossip_debug(GOSSIP_DCACHE_DEBUG, "%s: negative dentry or positive dentry and inode valid.\n", __func__); return 1; } const struct dentry_operations orangefs_dentry_operations = { .d_revalidate = orangefs_d_revalidate, }; ue='bf29bddf0417a4783da3b24e8c9e017ac649326f'/>
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authorJiri Kosina <jkosina@suse.cz>2017-01-27 22:25:52 +0000
committerIngo Molnar <mingo@kernel.org>2017-01-28 09:18:56 +0100
commitbf29bddf0417a4783da3b24e8c9e017ac649326f (patch)
tree54a05a4883b73f80e4e1d8c4b15750aa01c39932 /tools/testing/selftests/firmware/config
parent883af14e67e8b8702b5560aa64c888c0cd0bd66c (diff)
x86/efi: Always map the first physical page into the EFI pagetables
Commit: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") stopped creating 1:1 mappings for all RAM, when running in native 64-bit mode. It turns out though that there are 64-bit EFI implementations in the wild (this particular problem has been reported on a Lenovo Yoga 710-11IKB), which still make use of the first physical page for their own private use, even though they explicitly mark it EFI_CONVENTIONAL_MEMORY in the memory map. In case there is no mapping for this particular frame in the EFI pagetables, as soon as firmware tries to make use of it, a triple fault occurs and the system reboots (in case of the Yoga 710-11IKB this is very early during bootup). Fix that by always mapping the first page of physical memory into the EFI pagetables. We're free to hand this page to the BIOS, as trim_bios_range() will reserve the first page and isolate it away from memory allocators anyway. Note that just reverting 129766708 alone is not enough on v4.9-rc1+ to fix the regression on affected hardware, as this commit: ab72a27da ("x86/efi: Consolidate region mapping logic") later made the first physical frame not to be mapped anyway. Reported-by: Hanka Pavlikova <hanka@ucw.cz> Signed-off-by: Jiri Kosina <jkosina@suse.cz> Signed-off-by: Matt Fleming <matt@codeblueprint.co.uk> Cc: Ard Biesheuvel <ard.biesheuvel@linaro.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Borislav Petkov <bp@suse.de> Cc: Laura Abbott <labbott@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vojtech Pavlik <vojtech@ucw.cz> Cc: Waiman Long <waiman.long@hpe.com> Cc: linux-efi@vger.kernel.org Cc: stable@kernel.org # v4.8+ Fixes: 129766708 ("x86/efi: Only map RAM into EFI page tables if in mixed-mode") Link: http://lkml.kernel.org/r/20170127222552.22336-1-matt@codeblueprint.co.uk [ Tidied up the changelog and the comment. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/testing/selftests/firmware/config')