Merge tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "Features:
   - coredump: add tracepoint for coredump events
   - fs: hide file and bfile caches behind runtime const machinery

  Fixes:
   - fix architecture-specific compat_ftruncate64 implementations
   - dcache: Limit the minimal number of bucket to two
   - fs/omfs: reject s_sys_blocksize smaller than OMFS_DIR_START
   - fs/mbcache: cancel shrink work before destroying the cache
   - dcache: permit dynamic_dname()s up to NAME_MAX

  Cleanups:
   - remove or unexport unused fs_context infrastructure
   - trivial ->setattr cleanups
   - selftests/filesystems: Assume that TIOCGPTPEER is defined
   - writeback: fix kernel-doc function name mismatch for wb_put_many()
   - autofs: replace manual symlink buffer allocation in autofs_dir_symlink
   - init/initramfs.c: trivial fix: FSM -> Finite-state machine
   - fs: remove stale and duplicate forward declarations
   - readdir: Introduce dirent_size()
   - fs: Replace user_access_{begin/end} by scoped user access
   - kernel: acct: fix duplicate word in comment
   - fs: write a better comment in step_into() concerning .mnt assignment
   - fs: attr: fix comment formatting and spelling issues"

* tag 'vfs-7.1-rc1.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (28 commits)
  dcache: permit dynamic_dname()s up to NAME_MAX
  fs: attr: fix comment formatting and spelling issues
  fs: hide file and bfile caches behind runtime const machinery
  fs: write a better comment in step_into() concerning .mnt assignment
  proc: rename proc_notify_change to proc_setattr
  proc: rename proc_setattr to proc_nochmod_setattr
  affs: rename affs_notify_change to affs_setattr
  adfs: rename adfs_notify_change to adfs_setattr
  hfs: update comments on hfs_inode_setattr
  kernel: acct: fix duplicate word in comment
  fs: Replace user_access_{begin/end} by scoped user access
  readdir: Introduce dirent_size()
  coredump: add tracepoint for coredump events
  fs: remove do_sys_truncate
  fs: pass on FTRUNCATE_* flags to do_truncate
  fs: fix archiecture-specific compat_ftruncate64
  fs: remove stale and duplicate forward declarations
  init/initramfs.c: trivial fix: FSM -> Finite-state machine
  autofs: replace manual symlink buffer allocation in autofs_dir_symlink
  fs/mbcache: cancel shrink work before destroying the cache
  ...

Documentation/filesystems/mount_api.rst

@@ -647,9 +647,7 @@ The members are as follows:
 	fs_param_is_u64		64-bit unsigned int	result->uint_64
 	fs_param_is_enum	Enum value name 	result->uint_32
 	fs_param_is_string	Arbitrary string	param->string
-	fs_param_is_blob	Binary blob		param->blob
 	fs_param_is_blockdev	Blockdev path		* Needs lookup
-	fs_param_is_path	Path			* Needs lookup
 	fs_param_is_fd		File descriptor		result->int_32
 	fs_param_is_uid		User ID (u32)           result->uid
 	fs_param_is_gid		Group ID (u32)          result->gid
@@ -681,9 +679,7 @@ The members are as follows:
 	fsparam_u64()		fs_param_is_u64
 	fsparam_enum()		fs_param_is_enum
 	fsparam_string()	fs_param_is_string
-	fsparam_blob()		fs_param_is_blob
 	fsparam_bdev()		fs_param_is_blockdev
-	fsparam_path()		fs_param_is_path
 	fsparam_fd()		fs_param_is_fd
 	fsparam_uid()		fs_param_is_uid
 	fsparam_gid()		fs_param_is_gid

arch/arm64/kernel/sys32.c

@@ -89,7 +89,7 @@ COMPAT_SYSCALL_DEFINE4(aarch32_truncate64, const char __user *, pathname,
 COMPAT_SYSCALL_DEFINE4(aarch32_ftruncate64, unsigned int, fd, u32, __pad,
 		       arg_u32p(length))
 {
-	return ksys_ftruncate(fd, arg_u64(length));
+	return ksys_ftruncate(fd, arg_u64(length), FTRUNCATE_LFS);
 }
 
 COMPAT_SYSCALL_DEFINE5(aarch32_readahead, int, fd, u32, __pad,

arch/mips/kernel/linux32.c

@@ -60,7 +60,7 @@ SYSCALL_DEFINE4(32_truncate64, const char __user *, path,
 SYSCALL_DEFINE4(32_ftruncate64, unsigned long, fd, unsigned long, __dummy,
 	unsigned long, a2, unsigned long, a3)
 {
-	return ksys_ftruncate(fd, merge_64(a2, a3));
+	return ksys_ftruncate(fd, merge_64(a2, a3), FTRUNCATE_LFS);
 }
 
 SYSCALL_DEFINE5(32_llseek, unsigned int, fd, unsigned int, offset_high,

arch/parisc/kernel/sys_parisc.c

@@ -216,7 +216,7 @@ asmlinkage long parisc_truncate64(const char __user * path,
 asmlinkage long parisc_ftruncate64(unsigned int fd,
 					unsigned int high, unsigned int low)
 {
-	return ksys_ftruncate(fd, (long)high << 32 | low);
+	return ksys_ftruncate(fd, (long)high << 32 | low, FTRUNCATE_LFS);
 }
 
 /* stubs for the benefit of the syscall_table since truncate64 and truncate 
@@ -227,7 +227,7 @@ asmlinkage long sys_truncate64(const char __user * path, unsigned long length)
 }
 asmlinkage long sys_ftruncate64(unsigned int fd, unsigned long length)
 {
-	return ksys_ftruncate(fd, length);
+	return ksys_ftruncate(fd, length, FTRUNCATE_LFS);
 }
 asmlinkage long sys_fcntl64(unsigned int fd, unsigned int cmd, unsigned long arg)
 {

arch/powerpc/kernel/sys_ppc32.c

@@ -101,7 +101,7 @@ PPC32_SYSCALL_DEFINE4(ppc_ftruncate64,
 		       unsigned int, fd, u32, reg4,
 		       unsigned long, len1, unsigned long, len2)
 {
-	return ksys_ftruncate(fd, merge_64(len1, len2));
+	return ksys_ftruncate(fd, merge_64(len1, len2), FTRUNCATE_LFS);
 }
 
 PPC32_SYSCALL_DEFINE6(ppc32_fadvise64,

arch/sparc/kernel/sys_sparc32.c

@@ -58,7 +58,7 @@ COMPAT_SYSCALL_DEFINE3(truncate64, const char __user *, path, u32, high, u32, lo
 
 COMPAT_SYSCALL_DEFINE3(ftruncate64, unsigned int, fd, u32, high, u32, low)
 {
-	return ksys_ftruncate(fd, ((u64)high << 32) | low);
+	return ksys_ftruncate(fd, ((u64)high << 32) | low, FTRUNCATE_LFS);
 }
 
 static int cp_compat_stat64(struct kstat *stat,

arch/x86/kernel/sys_ia32.c

@@ -61,7 +61,8 @@ SYSCALL_DEFINE3(ia32_truncate64, const char __user *, filename,
 SYSCALL_DEFINE3(ia32_ftruncate64, unsigned int, fd,
 		unsigned long, offset_low, unsigned long, offset_high)
 {
-	return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low);
+	return ksys_ftruncate(fd, ((loff_t) offset_high << 32) | offset_low,
+			FTRUNCATE_LFS);
 }
 
 /* warning: next two assume little endian */

fs/adfs/adfs.h

@@ -144,8 +144,8 @@ struct adfs_discmap {
 /* Inode stuff */
 struct inode *adfs_iget(struct super_block *sb, struct object_info *obj);
 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc);
-int adfs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
-		       struct iattr *attr);
+int adfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
+		struct iattr *attr);
 
 /* map.c */
 int adfs_map_lookup(struct super_block *sb, u32 frag_id, unsigned int offset);

fs/adfs/dir.c

@@ -454,5 +454,5 @@ adfs_lookup(struct inode *dir, struct dentry *dentry, unsigned int flags)
  */
 const struct inode_operations adfs_dir_inode_operations = {
 	.lookup		= adfs_lookup,
-	.setattr	= adfs_notify_change,
+	.setattr	= adfs_setattr,
 };

fs/adfs/file.c

@@ -32,5 +32,5 @@ const struct file_operations adfs_file_operations = {
 };
 
 const struct inode_operations adfs_file_inode_operations = {
-	.setattr	= adfs_notify_change,
+	.setattr	= adfs_setattr,
 };

fs/adfs/inode.c

@@ -299,8 +299,7 @@ out:
  * later.
  */
 int
-adfs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
-		   struct iattr *attr)
+adfs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	struct super_block *sb = inode->i_sb;
@@ -355,8 +354,7 @@ out:
 
 /*
  * write an existing inode back to the directory, and therefore the disk.
- * The adfs-specific inode data has already been updated by
- * adfs_notify_change()
+ * The adfs-specific inode data has already been updated by * adfs_setattr().
  */
 int adfs_write_inode(struct inode *inode, struct writeback_control *wbc)
 {

fs/affs/affs.h

@@ -186,7 +186,7 @@ extern int	affs_rename2(struct mnt_idmap *idmap,
 /* inode.c */
 
 extern struct inode		*affs_new_inode(struct inode *dir);
-extern int			 affs_notify_change(struct mnt_idmap *idmap,
+extern int			 affs_setattr(struct mnt_idmap *idmap,
 					struct dentry *dentry, struct iattr *attr);
 extern void			 affs_evict_inode(struct inode *inode);
 extern struct inode		*affs_iget(struct super_block *sb,

fs/affs/dir.c

@@ -71,7 +71,7 @@ const struct inode_operations affs_dir_inode_operations = {
 	.mkdir		= affs_mkdir,
 	.rmdir		= affs_rmdir,
 	.rename		= affs_rename2,
-	.setattr	= affs_notify_change,
+	.setattr	= affs_setattr,
 };
 
 static int

fs/affs/file.c

@@ -1016,5 +1016,5 @@ const struct file_operations affs_file_operations = {
 };
 
 const struct inode_operations affs_file_inode_operations = {
-	.setattr	= affs_notify_change,
+	.setattr	= affs_setattr,
 };

fs/affs/inode.c

@@ -213,13 +213,12 @@ affs_write_inode(struct inode *inode, struct writeback_control *wbc)
 }
 
 int
-affs_notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
-		   struct iattr *attr)
+affs_setattr(struct mnt_idmap *idmap, struct dentry *dentry, struct iattr *attr)
 {
 	struct inode *inode = d_inode(dentry);
 	int error;
 
-	pr_debug("notify_change(%llu,0x%x)\n", inode->i_ino, attr->ia_valid);
+	pr_debug("setattr(%llu,0x%x)\n", inode->i_ino, attr->ia_valid);
 
 	error = setattr_prepare(&nop_mnt_idmap, dentry, attr);
 	if (error)

fs/affs/symlink.c

@@ -71,5 +71,5 @@ const struct address_space_operations affs_symlink_aops = {
 
 const struct inode_operations affs_symlink_inode_operations = {
 	.get_link	= page_get_link,
-	.setattr	= affs_notify_change,
+	.setattr	= affs_setattr,
 };

fs/attr.c

@@ -46,8 +46,8 @@ int setattr_should_drop_sgid(struct mnt_idmap *idmap,
 EXPORT_SYMBOL(setattr_should_drop_sgid);
 
 /**
- * setattr_should_drop_suidgid - determine whether the set{g,u}id bit needs to
- *                               be dropped
+ * setattr_should_drop_suidgid - determine whether the set{g,u}id bit
+ *                               needs to be dropped
  * @idmap:	idmap of the mount @inode was found from
  * @inode:	inode to check
  *
@@ -165,7 +165,7 @@ int setattr_prepare(struct mnt_idmap *idmap, struct dentry *dentry,
 	unsigned int ia_valid = attr->ia_valid;
 
 	/*
-	 * First check size constraints.  These can't be overriden using
+	 * First check size constraints.  These can't be overridden using
 	 * ATTR_FORCE.
 	 */
 	if (ia_valid & ATTR_SIZE) {

fs/autofs/root.c

@@ -7,6 +7,7 @@
 
 #include <linux/capability.h>
 #include <linux/compat.h>
+#include <linux/string.h>
 
 #include "autofs_i.h"
 
@@ -578,7 +579,6 @@ static int autofs_dir_symlink(struct mnt_idmap *idmap,
 	struct autofs_info *ino = autofs_dentry_ino(dentry);
 	struct autofs_info *p_ino;
 	struct inode *inode;
-	size_t size = strlen(symname);
 	char *cp;
 
 	pr_debug("%s <- %pd\n", symname, dentry);
@@ -589,19 +589,17 @@ static int autofs_dir_symlink(struct mnt_idmap *idmap,
 
 	autofs_del_active(dentry);
 
-	cp = kmalloc(size + 1, GFP_KERNEL);
+	cp = kstrdup(symname, GFP_KERNEL);
 	if (!cp)
 		return -ENOMEM;
 
-	strcpy(cp, symname);
-
 	inode = autofs_get_inode(dir->i_sb, S_IFLNK | 0555);
 	if (!inode) {
 		kfree(cp);
 		return -ENOMEM;
 	}
 	inode->i_private = cp;
-	inode->i_size = size;
+	inode->i_size = strlen(cp);
 
 	d_make_persistent(dentry, inode);
 	p_ino = autofs_dentry_ino(dentry->d_parent);

fs/coredump.c

@@ -63,6 +63,9 @@
 
 #include <trace/events/sched.h>
 
+#define CREATE_TRACE_POINTS
+#include <trace/events/coredump.h>
+
 static bool dump_vma_snapshot(struct coredump_params *cprm);
 static void free_vma_snapshot(struct coredump_params *cprm);
 
@@ -1090,6 +1093,8 @@ static inline bool coredump_skip(const struct coredump_params *cprm,
 static void do_coredump(struct core_name *cn, struct coredump_params *cprm,
 			size_t **argv, int *argc, const struct linux_binfmt *binfmt)
 {
+	trace_coredump(cprm->siginfo->si_signo);
+
 	if (!coredump_parse(cn, cprm, argv, argc)) {
 		coredump_report_failure("format_corename failed, aborting core");
 		return;

fs/d_path.c

@@ -301,18 +301,19 @@ EXPORT_SYMBOL(d_path);
 char *dynamic_dname(char *buffer, int buflen, const char *fmt, ...)
 {
 	va_list args;
-	char temp[64];
+	char *start;
 	int sz;
 
 	va_start(args, fmt);
-	sz = vsnprintf(temp, sizeof(temp), fmt, args) + 1;
+	sz = vsnprintf(buffer, buflen, fmt, args) + 1;
 	va_end(args);
 
-	if (sz > sizeof(temp) || sz > buflen)
+	if (sz > NAME_MAX || sz > buflen)
 		return ERR_PTR(-ENAMETOOLONG);
 
-	buffer += buflen - sz;
-	return memcpy(buffer, temp, sz);
+	/* Move the formatted d_name to the end of the buffer. */
+	start = buffer + (buflen - sz);
+	return memmove(start, buffer, sz);
 }
 
 char *simple_dname(struct dentry *dentry, char *buffer, int buflen)