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v6.6-vfs.misc

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Merge tag 'v6.6-vfs.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs

Pull misc vfs updates from Christian Brauner:
 "This contains the usual miscellaneous features, cleanups, and fixes
  for vfs and individual filesystems.

  Features:

   - Block mode changes on symlinks and rectify our broken semantics

   - Report file modifications via fsnotify() for splice

   - Allow specifying an explicit timeout for the "rootwait" kernel
     command line option. This allows to timeout and reboot instead of
     always waiting indefinitely for the root device to show up

   - Use synchronous fput for the close system call

  Cleanups:

   - Get rid of open-coded lockdep workarounds for async io submitters
     and replace it all with a single consolidated helper

   - Simplify epoll allocation helper

   - Convert simple_write_begin and simple_write_end to use a folio

   - Convert page_cache_pipe_buf_confirm() to use a folio

   - Simplify __range_close to avoid pointless locking

   - Disable per-cpu buffer head cache for isolated cpus

   - Port ecryptfs to kmap_local_page() api

   - Remove redundant initialization of pointer buf in pipe code

   - Unexport the d_genocide() function which is only used within core
     vfs

   - Replace printk(KERN_ERR) and WARN_ON() with WARN()

  Fixes:

   - Fix various kernel-doc issues

   - Fix refcount underflow for eventfds when used as EFD_SEMAPHORE

   - Fix a mainly theoretical issue in devpts

   - Check the return value of __getblk() in reiserfs

   - Fix a racy assert in i_readcount_dec

   - Fix integer conversion issues in various functions

   - Fix LSM security context handling during automounts that prevented
     NFS superblock sharing"

* tag 'v6.6-vfs.misc' of git://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs: (39 commits)
  cachefiles: use kiocb_{start,end}_write() helpers
  ovl: use kiocb_{start,end}_write() helpers
  aio: use kiocb_{start,end}_write() helpers
  io_uring: use kiocb_{start,end}_write() helpers
  fs: create kiocb_{start,end}_write() helpers
  fs: add kerneldoc to file_{start,end}_write() helpers
  io_uring: rename kiocb_end_write() local helper
  splice: Convert page_cache_pipe_buf_confirm() to use a folio
  libfs: Convert simple_write_begin and simple_write_end to use a folio
  fs/dcache: Replace printk and WARN_ON by WARN
  fs/pipe: remove redundant initialization of pointer buf
  fs: Fix kernel-doc warnings
  devpts: Fix kernel-doc warnings
  doc: idmappings: fix an error and rephrase a paragraph
  init: Add support for rootwait timeout parameter
  vfs: fix up the assert in i_readcount_dec
  fs: Fix one kernel-doc comment
  docs: filesystems: idmappings: clarify from where idmappings are taken
  fs/buffer.c: disable per-CPU buffer_head cache for isolated CPUs
  vfs, security: Fix automount superblock LSM init problem, preventing NFS sb sharing
  ...
This commit is contained in:
Linus Torvalds 2023-08-28 10:17:14 -07:00
commit de16588a77
44 changed files with 459 additions and 244 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
Documentation/admin-guide/kernel-parameters.txt
View File

@ -5522,6 +5522,10 @@
Useful for devices that are detected asynchronously
(e.g. USB and MMC devices).
rootwait= [KNL] Maximum time (in seconds) to wait for root device
to show up before attempting to mount the root
filesystem.
rproc_mem=nn[KMG][@address]
[KNL,ARM,CMA] Remoteproc physical memory block.
Memory area to be used by remote processor image,

14
Documentation/filesystems/idmappings.rst
View File

@ -146,9 +146,10 @@ For the rest of this document we will prefix all userspace ids with ``u`` and
all kernel ids with ``k``. Ranges of idmappings will be prefixed with ``r``. So
an idmapping will be written as ``u0:k10000:r10000``.
For example, the id ``u1000`` is an id in the upper idmapset or "userspace
idmapset" starting with ``u1000``. And it is mapped to ``k11000`` which is a
kernel id in the lower idmapset or "kernel idmapset" starting with ``k10000``.
For example, within this idmapping, the id ``u1000`` is an id in the upper
idmapset or "userspace idmapset" starting with ``u0``. And it is mapped to
``k11000`` which is a kernel id in the lower idmapset or "kernel idmapset"
starting with ``k10000``.
A kernel id is always created by an idmapping. Such idmappings are associated
with user namespaces. Since we mainly care about how idmappings work we're not
@ -373,6 +374,13 @@ kernel maps the caller's userspace id down into a kernel id according to the
caller's idmapping and then maps that kernel id up according to the
filesystem's idmapping.
From the implementation point it's worth mentioning how idmappings are represented.
All idmappings are taken from the corresponding user namespace.
- caller's idmapping (usually taken from ``current_user_ns()``)
- filesystem's idmapping (``sb->s_user_ns``)
- mount's idmapping (``mnt_idmap(vfsmnt)``)
Let's see some examples with caller/filesystem idmapping but without mount
idmappings. This will exhibit some problems we can hit. After that we will
revisit/reconsider these examples, this time using mount idmappings, to see how

20
fs/aio.c
View File

@ -1447,13 +1447,8 @@ static void aio_complete_rw(struct kiocb *kiocb, long res)
if (kiocb->ki_flags & IOCB_WRITE) {
struct inode *inode = file_inode(kiocb->ki_filp);
/*
* Tell lockdep we inherited freeze protection from submission
* thread.
*/
if (S_ISREG(inode->i_mode))
__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
file_end_write(kiocb->ki_filp);
kiocb_end_write(kiocb);
}
iocb->ki_res.res = res;
@ -1581,17 +1576,8 @@ static int aio_write(struct kiocb *req, const struct iocb *iocb,
return ret;
ret = rw_verify_area(WRITE, file, &req->ki_pos, iov_iter_count(&iter));
if (!ret) {
/*
* Open-code file_start_write here to grab freeze protection,
* which will be released by another thread in
* aio_complete_rw(). Fool lockdep by telling it the lock got
* released so that it doesn't complain about the held lock when
* we return to userspace.
*/
if (S_ISREG(file_inode(file)->i_mode)) {
sb_start_write(file_inode(file)->i_sb);
__sb_writers_release(file_inode(file)->i_sb, SB_FREEZE_WRITE);
}
if (S_ISREG(file_inode(file)->i_mode))
kiocb_start_write(req);
req->ki_flags |= IOCB_WRITE;
aio_rw_done(req, call_write_iter(file, req, &iter));
}

20
fs/attr.c
View File

@ -394,9 +394,25 @@ int notify_change(struct mnt_idmap *idmap, struct dentry *dentry,
return error;
if ((ia_valid & ATTR_MODE)) {
umode_t amode = attr->ia_mode;
/*
* Don't allow changing the mode of symlinks:
*
* (1) The vfs doesn't take the mode of symlinks into account
* during permission checking.
* (2) This has never worked correctly. Most major filesystems
* did return EOPNOTSUPP due to interactions with POSIX ACLs
* but did still updated the mode of the symlink.
* This inconsistency led system call wrapper providers such
* as libc to block changing the mode of symlinks with
* EOPNOTSUPP already.
* (3) To even do this in the first place one would have to use
* specific file descriptors and quite some effort.
*/
if (S_ISLNK(inode->i_mode))
return -EOPNOTSUPP;
/* Flag setting protected by i_mutex */
if (is_sxid(amode))
if (is_sxid(attr->ia_mode))
inode->i_flags &= ~S_NOSEC;
}

7
fs/buffer.c
View File

@ -49,6 +49,7 @@
#include <trace/events/block.h>
#include <linux/fscrypt.h>
#include <linux/fsverity.h>
#include <linux/sched/isolation.h>
#include "internal.h"
@ -1352,7 +1353,7 @@ static void bh_lru_install(struct buffer_head *bh)
* failing page migration.
* Skip putting upcoming bh into bh_lru until migration is done.
*/
if (lru_cache_disabled()) {
if (lru_cache_disabled() || cpu_is_isolated(smp_processor_id())) {
bh_lru_unlock();
return;
}
@ -1382,6 +1383,10 @@ lookup_bh_lru(struct block_device *bdev, sector_t block, unsigned size)
check_irqs_on();
bh_lru_lock();
if (cpu_is_isolated(smp_processor_id())) {
bh_lru_unlock();
return NULL;
}
for (i = 0; i < BH_LRU_SIZE; i++) {
struct buffer_head *bh = __this_cpu_read(bh_lrus.bhs[i]);

16
fs/cachefiles/io.c
View File

@ -259,9 +259,7 @@ static void cachefiles_write_complete(struct kiocb *iocb, long ret)
_enter("%ld", ret);
/* Tell lockdep we inherited freeze protection from submission thread */
__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
__sb_end_write(inode->i_sb, SB_FREEZE_WRITE);
kiocb_end_write(iocb);
if (ret < 0)
trace_cachefiles_io_error(object, inode, ret,
@ -286,7 +284,6 @@ int __cachefiles_write(struct cachefiles_object *object,
{
struct cachefiles_cache *cache;
struct cachefiles_kiocb *ki;
struct inode *inode;
unsigned int old_nofs;
ssize_t ret;
size_t len = iov_iter_count(iter);
@ -322,19 +319,12 @@ int __cachefiles_write(struct cachefiles_object *object,
ki->iocb.ki_complete = cachefiles_write_complete;
atomic_long_add(ki->b_writing, &cache->b_writing);
/* Open-code file_start_write here to grab freeze protection, which
* will be released by another thread in aio_complete_rw(). Fool
* lockdep by telling it the lock got released so that it doesn't
* complain about the held lock when we return to userspace.
*/
inode = file_inode(file);
__sb_start_write(inode->i_sb, SB_FREEZE_WRITE);
__sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);
kiocb_start_write(&ki->iocb);
get_file(ki->iocb.ki_filp);
cachefiles_grab_object(object, cachefiles_obj_get_ioreq);
trace_cachefiles_write(object, inode, ki->iocb.ki_pos, len);
trace_cachefiles_write(object, file_inode(file), ki->iocb.ki_pos, len);
old_nofs = memalloc_nofs_save();
ret = cachefiles_inject_write_error();
if (ret == 0)

5
fs/dcache.c
View File

@ -1664,7 +1664,7 @@ static enum d_walk_ret umount_check(void *_data, struct dentry *dentry)
if (dentry == _data && dentry->d_lockref.count == 1)
return D_WALK_CONTINUE;
printk(KERN_ERR "BUG: Dentry %p{i=%lx,n=%pd} "
WARN(1, "BUG: Dentry %p{i=%lx,n=%pd} "
" still in use (%d) [unmount of %s %s]\n",
dentry,
dentry->d_inode ?
@ -1673,7 +1673,6 @@ static enum d_walk_ret umount_check(void *_data, struct dentry *dentry)
dentry->d_lockref.count,
dentry->d_sb->s_type->name,
dentry->d_sb->s_id);
WARN_ON(1);
return D_WALK_CONTINUE;
}
@ -3247,8 +3246,6 @@ void d_genocide(struct dentry *parent)
d_walk(parent, parent, d_genocide_kill);
}
EXPORT_SYMBOL(d_genocide);
void d_tmpfile(struct file *file, struct inode *inode)
{
struct dentry *dentry = file->f_path.dentry;

10
fs/devpts/inode.c
View File

@ -534,12 +534,12 @@ void devpts_kill_index(struct pts_fs_info *fsi, int idx)
/**
* devpts_pty_new -- create a new inode in /dev/pts/
* @ptmx_inode: inode of the master
* @device: major+minor of the node to be created
* @fsi: Filesystem info for this instance.
* @index: used as a name of the node
* @priv: what's given back by devpts_get_priv
*
* The created inode is returned. Remove it from /dev/pts/ by devpts_pty_kill.
* The dentry for the created inode is returned.
* Remove it from /dev/pts/ with devpts_pty_kill().
*/
struct dentry *devpts_pty_new(struct pts_fs_info *fsi, int index, void *priv)
{
@ -580,7 +580,7 @@ struct dentry *devpts_pty_new(struct pts_fs_info *fsi, int index, void *priv)
/**
* devpts_get_priv -- get private data for a slave
* @pts_inode: inode of the slave
* @dentry: dentry of the slave
*
* Returns whatever was passed as priv in devpts_pty_new for a given inode.
*/
@ -593,7 +593,7 @@ void *devpts_get_priv(struct dentry *dentry)
/**
* devpts_pty_kill -- remove inode form /dev/pts/
* @inode: inode of the slave to be removed
* @dentry: dentry of the slave to be removed
*
* This is an inverse operation of devpts_pty_new.
*/

8
fs/ecryptfs/crypto.c
View File

@ -441,10 +441,10 @@ int ecryptfs_encrypt_page(struct page *page)
}
lower_offset = lower_offset_for_page(crypt_stat, page);
enc_extent_virt = kmap(enc_extent_page);
enc_extent_virt = kmap_local_page(enc_extent_page);
rc = ecryptfs_write_lower(ecryptfs_inode, enc_extent_virt, lower_offset,
PAGE_SIZE);
kunmap(enc_extent_page);
kunmap_local(enc_extent_virt);
if (rc < 0) {
ecryptfs_printk(KERN_ERR,
"Error attempting to write lower page; rc = [%d]\n",
@ -490,10 +490,10 @@ int ecryptfs_decrypt_page(struct page *page)
BUG_ON(!(crypt_stat->flags & ECRYPTFS_ENCRYPTED));
lower_offset = lower_offset_for_page(crypt_stat, page);
page_virt = kmap(page);
page_virt = kmap_local_page(page);
rc = ecryptfs_read_lower(page_virt, lower_offset, PAGE_SIZE,
ecryptfs_inode);
kunmap(page);
kunmap_local(page_virt);
if (rc < 0) {
ecryptfs_printk(KERN_ERR,
"Error attempting to read lower page; rc = [%d]\n",

5
fs/ecryptfs/mmap.c
View File

@ -125,7 +125,7 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page,
/* This is a header extent */
char *page_virt;
page_virt = kmap_atomic(page);
page_virt = kmap_local_page(page);
memset(page_virt, 0, PAGE_SIZE);
/* TODO: Support more than one header extent */
if (view_extent_num == 0) {
@ -138,7 +138,7 @@ ecryptfs_copy_up_encrypted_with_header(struct page *page,
crypt_stat,
&written);
}
kunmap_atomic(page_virt);
kunmap_local(page_virt);
flush_dcache_page(page);
if (rc) {
printk(KERN_ERR "%s: Error reading xattr "
@ -255,7 +255,6 @@ out:
* @mapping: The eCryptfs object
* @pos: The file offset at which to start writing
* @len: Length of the write
* @flags: Various flags
* @pagep: Pointer to return the page
* @fsdata: Pointer to return fs data (unused)
*

12
fs/ecryptfs/read_write.c
View File

@ -64,11 +64,11 @@ int ecryptfs_write_lower_page_segment(struct inode *ecryptfs_inode,
offset = ((((loff_t)page_for_lower->index) << PAGE_SHIFT)
+ offset_in_page);
virt = kmap(page_for_lower);
virt = kmap_local_page(page_for_lower);
rc = ecryptfs_write_lower(ecryptfs_inode, virt, offset, size);
if (rc > 0)
rc = 0;
kunmap(page_for_lower);
kunmap_local(virt);
return rc;
}
@ -140,7 +140,7 @@ int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset,
ecryptfs_page_idx, rc);
goto out;
}
ecryptfs_page_virt = kmap_atomic(ecryptfs_page);
ecryptfs_page_virt = kmap_local_page(ecryptfs_page);
/*
* pos: where we're now writing, offset: where the request was
@ -163,7 +163,7 @@ int ecryptfs_write(struct inode *ecryptfs_inode, char *data, loff_t offset,
(data + data_offset), num_bytes);
data_offset += num_bytes;
}
kunmap_atomic(ecryptfs_page_virt);
kunmap_local(ecryptfs_page_virt);
flush_dcache_page(ecryptfs_page);
SetPageUptodate(ecryptfs_page);
unlock_page(ecryptfs_page);
@ -253,11 +253,11 @@ int ecryptfs_read_lower_page_segment(struct page *page_for_ecryptfs,
int rc;
offset = ((((loff_t)page_index) << PAGE_SHIFT) + offset_in_page);
virt = kmap(page_for_ecryptfs);
virt = kmap_local_page(page_for_ecryptfs);
rc = ecryptfs_read_lower(virt, offset, size, ecryptfs_inode);
if (rc > 0)
rc = 0;
kunmap(page_for_ecryptfs);
kunmap_local(virt);
flush_dcache_page(page_for_ecryptfs);
return rc;
}

2
fs/eventfd.c
View File

@ -189,7 +189,7 @@ void eventfd_ctx_do_read(struct eventfd_ctx *ctx, __u64 *cnt)
{
lockdep_assert_held(&ctx->wqh.lock);
*cnt = (ctx->flags & EFD_SEMAPHORE) ? 1 : ctx->count;
*cnt = ((ctx->flags & EFD_SEMAPHORE) && ctx->count) ? 1 : ctx->count;
ctx->count -= *cnt;
}
EXPORT_SYMBOL_GPL(eventfd_ctx_do_read);

12
fs/eventpoll.c
View File

@ -975,15 +975,11 @@ again:
static int ep_alloc(struct eventpoll **pep)
{
int error;
struct user_struct *user;
struct eventpoll *ep;
user = get_current_user();
error = -ENOMEM;
ep = kzalloc(sizeof(*ep), GFP_KERNEL);
if (unlikely(!ep))
goto free_uid;
return -ENOMEM;
mutex_init(&ep->mtx);
rwlock_init(&ep->lock);
@ -992,16 +988,12 @@ static int ep_alloc(struct eventpoll **pep)
INIT_LIST_HEAD(&ep->rdllist);
ep->rbr = RB_ROOT_CACHED;
ep->ovflist = EP_UNACTIVE_PTR;
ep->user = user;
ep->user = get_current_user();
refcount_set(&ep->refcount, 1);
*pep = ep;
return 0;
free_uid:
free_uid(user);
return error;
}
/*

29
fs/fcntl.c
View File

@ -34,7 +34,7 @@
#define SETFL_MASK (O_APPEND | O_NONBLOCK | O_NDELAY | O_DIRECT | O_NOATIME)
static int setfl(int fd, struct file * filp, unsigned long arg)
static int setfl(int fd, struct file * filp, unsigned int arg)
{
struct inode * inode = file_inode(filp);
int error = 0;
@ -112,11 +112,11 @@ void __f_setown(struct file *filp, struct pid *pid, enum pid_type type,
}
EXPORT_SYMBOL(__f_setown);
int f_setown(struct file *filp, unsigned long arg, int force)
int f_setown(struct file *filp, int who, int force)
{
enum pid_type type;
struct pid *pid = NULL;
int who = arg, ret = 0;
int ret = 0;
type = PIDTYPE_TGID;
if (who < 0) {
@ -317,28 +317,29 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
struct file *filp)
{
void __user *argp = (void __user *)arg;
int argi = (int)arg;
struct flock flock;
long err = -EINVAL;
switch (cmd) {
case F_DUPFD:
err = f_dupfd(arg, filp, 0);
err = f_dupfd(argi, filp, 0);
break;
case F_DUPFD_CLOEXEC:
err = f_dupfd(arg, filp, O_CLOEXEC);
err = f_dupfd(argi, filp, O_CLOEXEC);
break;
case F_GETFD:
err = get_close_on_exec(fd) ? FD_CLOEXEC : 0;
break;
case F_SETFD:
err = 0;
set_close_on_exec(fd, arg & FD_CLOEXEC);
set_close_on_exec(fd, argi & FD_CLOEXEC);
break;
case F_GETFL:
err = filp->f_flags;
break;
case F_SETFL:
err = setfl(fd, filp, arg);
err = setfl(fd, filp, argi);
break;
#if BITS_PER_LONG != 32
/* 32-bit arches must use fcntl64() */
@ -375,7 +376,7 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
force_successful_syscall_return();
break;
case F_SETOWN:
err = f_setown(filp, arg, 1);
err = f_setown(filp, argi, 1);
break;
case F_GETOWN_EX:
err = f_getown_ex(filp, arg);
@ -391,28 +392,28 @@ static long do_fcntl(int fd, unsigned int cmd, unsigned long arg,
break;
case F_SETSIG:
/* arg == 0 restores default behaviour. */
if (!valid_signal(arg)) {
if (!valid_signal(argi)) {
break;
}
err = 0;
filp->f_owner.signum = arg;
filp->f_owner.signum = argi;
break;
case F_GETLEASE:
err = fcntl_getlease(filp);
break;
case F_SETLEASE:
err = fcntl_setlease(fd, filp, arg);
err = fcntl_setlease(fd, filp, argi);
break;
case F_NOTIFY:
err = fcntl_dirnotify(fd, filp, arg);
err = fcntl_dirnotify(fd, filp, argi);
break;
case F_SETPIPE_SZ:
case F_GETPIPE_SZ:
err = pipe_fcntl(filp, cmd, arg);
err = pipe_fcntl(filp, cmd, argi);
break;
case F_ADD_SEALS:
case F_GET_SEALS:
err = memfd_fcntl(filp, cmd, arg);
err = memfd_fcntl(filp, cmd, argi);
break;
case F_GET_RW_HINT:
case F_SET_RW_HINT:

30
fs/file.c
View File

@ -668,7 +668,7 @@ EXPORT_SYMBOL(close_fd); /* for ksys_close() */
/**
* last_fd - return last valid index into fd table
* @cur_fds: files struct
* @fdt: File descriptor table.
*
* Context: Either rcu read lock or files_lock must be held.
*
@ -693,29 +693,30 @@ static inline void __range_cloexec(struct files_struct *cur_fds,
spin_unlock(&cur_fds->file_lock);
}
static inline void __range_close(struct files_struct *cur_fds, unsigned int fd,
static inline void __range_close(struct files_struct *files, unsigned int fd,
unsigned int max_fd)
{
struct file *file;
unsigned n;
rcu_read_lock();
n = last_fd(files_fdtable(cur_fds));
rcu_read_unlock();
spin_lock(&files->file_lock);
n = last_fd(files_fdtable(files));
max_fd = min(max_fd, n);
while (fd <= max_fd) {
struct file *file;
spin_lock(&cur_fds->file_lock);
file = pick_file(cur_fds, fd++);
spin_unlock(&cur_fds->file_lock);
for (; fd <= max_fd; fd++) {
file = pick_file(files, fd);
if (file) {
/* found a valid file to close */
filp_close(file, cur_fds);
spin_unlock(&files->file_lock);
filp_close(file, files);
cond_resched();
spin_lock(&files->file_lock);
} else if (need_resched()) {
spin_unlock(&files->file_lock);
cond_resched();
spin_lock(&files->file_lock);
}
}
spin_unlock(&files->file_lock);
}
/**
@ -723,6 +724,7 @@ static inline void __range_close(struct files_struct *cur_fds, unsigned int fd,
*
* @fd: starting file descriptor to close
* @max_fd: last file descriptor to close
* @flags: CLOSE_RANGE flags.
*
* This closes a range of file descriptors. All file descriptors
* from @fd up to and including @max_fd are closed.

5
fs/file_table.c
View File

@ -461,11 +461,8 @@ void fput(struct file *file)
*/
void __fput_sync(struct file *file)
{
if (atomic_long_dec_and_test(&file->f_count)) {
struct task_struct *task = current;
BUG_ON(!(task->flags & PF_KTHREAD));
if (atomic_long_dec_and_test(&file->f_count))
__fput(file);
}
}
EXPORT_SYMBOL(fput);

35
fs/fs_context.c
View File

@ -162,6 +162,10 @@ EXPORT_SYMBOL(vfs_parse_fs_param);
/**
* vfs_parse_fs_string - Convenience function to just parse a string.
* @fc: Filesystem context.
* @key: Parameter name.
* @value: Default value.
* @v_size: Maximum number of bytes in the value.
*/
int vfs_parse_fs_string(struct fs_context *fc, const char *key,
const char *value, size_t v_size)
@ -189,7 +193,7 @@ EXPORT_SYMBOL(vfs_parse_fs_string);
/**
* generic_parse_monolithic - Parse key[=val][,key[=val]]* mount data
* @ctx: The superblock configuration to fill in.
* @fc: The superblock configuration to fill in.
* @data: The data to parse
*
* Parse a blob of data that's in key[=val][,key[=val]]* form. This can be
@ -315,10 +319,31 @@ struct fs_context *fs_context_for_reconfigure(struct dentry *dentry,
}
EXPORT_SYMBOL(fs_context_for_reconfigure);
/**
* fs_context_for_submount: allocate a new fs_context for a submount
* @type: file_system_type of the new context
* @reference: reference dentry from which to copy relevant info
*
* Allocate a new fs_context suitable for a submount. This also ensures that
* the fc->security object is inherited from @reference (if needed).
*/
struct fs_context *fs_context_for_submount(struct file_system_type *type,
struct dentry *reference)
{
return alloc_fs_context(type, reference, 0, 0, FS_CONTEXT_FOR_SUBMOUNT);
struct fs_context *fc;
int ret;
fc = alloc_fs_context(type, reference, 0, 0, FS_CONTEXT_FOR_SUBMOUNT);
if (IS_ERR(fc))
return fc;
ret = security_fs_context_submount(fc, reference->d_sb);
if (ret) {
put_fs_context(fc);
return ERR_PTR(ret);
}
return fc;
}
EXPORT_SYMBOL(fs_context_for_submount);
@ -333,7 +358,7 @@ void fc_drop_locked(struct fs_context *fc)
static void legacy_fs_context_free(struct fs_context *fc);
/**
* vfs_dup_fc_config: Duplicate a filesystem context.
* vfs_dup_fs_context - Duplicate a filesystem context.
* @src_fc: The context to copy.
*/
struct fs_context *vfs_dup_fs_context(struct fs_context *src_fc)
@ -379,7 +404,9 @@ EXPORT_SYMBOL(vfs_dup_fs_context);
/**
* logfc - Log a message to a filesystem context
* @fc: The filesystem context to log to.
* @log: The filesystem context to log to, or NULL to use printk.
* @prefix: A string to prefix the output with, or NULL.
* @level: 'w' for a warning, 'e' for an error. Anything else is a notice.
* @fmt: The format of the buffer.
*/
void logfc(struct fc_log *log, const char *prefix, char level, const char *fmt, ...)

10
fs/ioctl.c
View File

@ -109,9 +109,6 @@ static int ioctl_fibmap(struct file *filp, int __user *p)
* Returns 0 on success, -errno on error, 1 if this was the last
* extent that will fit in user array.
*/
#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
u64 phys, u64 len, u32 flags)
{
@ -127,6 +124,10 @@ int fiemap_fill_next_extent(struct fiemap_extent_info *fieinfo, u64 logical,
if (fieinfo->fi_extents_mapped >= fieinfo->fi_extents_max)
return 1;
#define SET_UNKNOWN_FLAGS (FIEMAP_EXTENT_DELALLOC)
#define SET_NO_UNMOUNTED_IO_FLAGS (FIEMAP_EXTENT_DATA_ENCRYPTED)
#define SET_NOT_ALIGNED_FLAGS (FIEMAP_EXTENT_DATA_TAIL|FIEMAP_EXTENT_DATA_INLINE)
if (flags & SET_UNKNOWN_FLAGS)
flags |= FIEMAP_EXTENT_UNKNOWN;
if (flags & SET_NO_UNMOUNTED_IO_FLAGS)
@ -877,6 +878,9 @@ out:
#ifdef CONFIG_COMPAT
/**
* compat_ptr_ioctl - generic implementation of .compat_ioctl file operation
* @file: The file to operate on.
* @cmd: The ioctl command number.
* @arg: The argument to the ioctl.
*
* This is not normally called as a function, but instead set in struct
* file_operations as

12
fs/kernel_read_file.c
View File

@ -8,16 +8,16 @@
/**
* kernel_read_file() - read file contents into a kernel buffer
*
* @file file to read from
* @offset where to start reading from (see below).
* @buf pointer to a "void *" buffer for reading into (if
* @file: file to read from
* @offset: where to start reading from (see below).
* @buf: pointer to a "void *" buffer for reading into (if
* *@buf is NULL, a buffer will be allocated, and
* @buf_size will be ignored)
* @buf_size size of buf, if already allocated. If @buf not
* @buf_size: size of buf, if already allocated. If @buf not
* allocated, this is the largest size to allocate.
* @file_size if non-NULL, the full size of @file will be
* @file_size: if non-NULL, the full size of @file will be
* written here.
* @id the kernel_read_file_id identifying the type of
* @id: the kernel_read_file_id identifying the type of
* file contents being read (for LSMs to examine)
*
* @offset must be 0 unless both @buf and @file_size are non-NULL

42
fs/libfs.c
View File

@ -815,21 +815,20 @@ int simple_write_begin(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len,
struct page **pagep, void **fsdata)
{
struct page *page;
pgoff_t index;
struct folio *folio;
index = pos >> PAGE_SHIFT;
folio = __filemap_get_folio(mapping, pos / PAGE_SIZE, FGP_WRITEBEGIN,
mapping_gfp_mask(mapping));
if (IS_ERR(folio))
return PTR_ERR(folio);
page = grab_cache_page_write_begin(mapping, index);
if (!page)
return -ENOMEM;
*pagep = &folio->page;
*pagep = page;
if (!folio_test_uptodate(folio) && (len != folio_size(folio))) {
size_t from = offset_in_folio(folio, pos);
if (!PageUptodate(page) && (len != PAGE_SIZE)) {
unsigned from = pos & (PAGE_SIZE - 1);
zero_user_segments(page, 0, from, from + len, PAGE_SIZE);
folio_zero_segments(folio, 0, from,
from + len, folio_size(folio));
}
return 0;
}
@ -861,17 +860,18 @@ static int simple_write_end(struct file *file, struct address_space *mapping,
loff_t pos, unsigned len, unsigned copied,
struct page *page, void *fsdata)
{
struct inode *inode = page->mapping->host;
struct folio *folio = page_folio(page);
struct inode *inode = folio->mapping->host;
loff_t last_pos = pos + copied;
/* zero the stale part of the page if we did a short copy */
if (!PageUptodate(page)) {
/* zero the stale part of the folio if we did a short copy */
if (!folio_test_uptodate(folio)) {
if (copied < len) {
unsigned from = pos & (PAGE_SIZE - 1);
size_t from = offset_in_folio(folio, pos);
zero_user(page, from + copied, len - copied);
folio_zero_range(folio, from + copied, len - copied);
}
SetPageUptodate(page);
folio_mark_uptodate(folio);
}
/*
* No need to use i_size_read() here, the i_size
@ -880,9 +880,9 @@ static int simple_write_end(struct file *file, struct address_space *mapping,
if (last_pos > inode->i_size)
i_size_write(inode, last_pos);
set_page_dirty(page);
unlock_page(page);
put_page(page);
folio_mark_dirty(folio);
folio_unlock(folio);
folio_put(folio);
return copied;
}
@ -1536,7 +1536,7 @@ EXPORT_SYMBOL(alloc_anon_inode);
* All arguments are ignored and it just returns -EINVAL.
*/
int
simple_nosetlease(struct file *filp, long arg, struct file_lock **flp,
simple_nosetlease(struct file *filp, int arg, struct file_lock **flp,
void **priv)
{
return -EINVAL;

20
fs/locks.c
View File

@ -438,7 +438,7 @@ static void flock_make_lock(struct file *filp, struct file_lock *fl, int type)
fl->fl_end = OFFSET_MAX;
}
static int assign_type(struct file_lock *fl, long type)
static int assign_type(struct file_lock *fl, int type)
{
switch (type) {
case F_RDLCK:
@ -549,7 +549,7 @@ static const struct lock_manager_operations lease_manager_ops = {
/*
* Initialize a lease, use the default lock manager operations
*/
static int lease_init(struct file *filp, long type, struct file_lock *fl)
static int lease_init(struct file *filp, int type, struct file_lock *fl)
{
if (assign_type(fl, type) != 0)
return -EINVAL;
@ -567,7 +567,7 @@ static int lease_init(struct file *filp, long type, struct file_lock *fl)
}
/* Allocate a file_lock initialised to this type of lease */
static struct file_lock *lease_alloc(struct file *filp, long type)
static struct file_lock *lease_alloc(struct file *filp, int type)
{
struct file_lock *fl = locks_alloc_lock();
int error = -ENOMEM;
@ -1666,7 +1666,7 @@ int fcntl_getlease(struct file *filp)
* conflict with the lease we're trying to set.
*/
static int
check_conflicting_open(struct file *filp, const long arg, int flags)
check_conflicting_open(struct file *filp, const int arg, int flags)
{
struct inode *inode = file_inode(filp);
int self_wcount = 0, self_rcount = 0;
@ -1701,7 +1701,7 @@ check_conflicting_open(struct file *filp, const long arg, int flags)
}
static int
generic_add_lease(struct file *filp, long arg, struct file_lock **flp, void **priv)
generic_add_lease(struct file *filp, int arg, struct file_lock **flp, void **priv)
{
struct file_lock *fl, *my_fl = NULL, *lease;
struct inode *inode = file_inode(filp);
@ -1859,7 +1859,7 @@ static int generic_delete_lease(struct file *filp, void *owner)
* The (input) flp->fl_lmops->lm_break function is required
* by break_lease().
*/
int generic_setlease(struct file *filp, long arg, struct file_lock **flp,
int generic_setlease(struct file *filp, int arg, struct file_lock **flp,
void **priv)
{
struct inode *inode = file_inode(filp);
@ -1906,7 +1906,7 @@ lease_notifier_chain_init(void)
}
static inline void
setlease_notifier(long arg, struct file_lock *lease)
setlease_notifier(int arg, struct file_lock *lease)
{
if (arg != F_UNLCK)
srcu_notifier_call_chain(&lease_notifier_chain, arg, lease);
@ -1942,7 +1942,7 @@ EXPORT_SYMBOL_GPL(lease_unregister_notifier);
* may be NULL if the lm_setup operation doesn't require it.
*/
int
vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv)
vfs_setlease(struct file *filp, int arg, struct file_lock **lease, void **priv)
{
if (lease)
setlease_notifier(arg, *lease);
@ -1953,7 +1953,7 @@ vfs_setlease(struct file *filp, long arg, struct file_lock **lease, void **priv)
}
EXPORT_SYMBOL_GPL(vfs_setlease);
static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
static int do_fcntl_add_lease(unsigned int fd, struct file *filp, int arg)
{
struct file_lock *fl;
struct fasync_struct *new;
@ -1988,7 +1988,7 @@ static int do_fcntl_add_lease(unsigned int fd, struct file *filp, long arg)
* Note that you also need to call %F_SETSIG to
* receive a signal when the lease is broken.
*/
int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
int fcntl_setlease(unsigned int fd, struct file *filp, int arg)
{
if (arg == F_UNLCK)
return vfs_setlease(filp, F_UNLCK, NULL, (void **)&filp);

5
fs/namei.c
View File

@ -643,6 +643,8 @@ static bool nd_alloc_stack(struct nameidata *nd)
/**
* path_connected - Verify that a dentry is below mnt.mnt_root
* @mnt: The mountpoint to check.
* @dentry: The dentry to check.
*
* Rename can sometimes move a file or directory outside of a bind
* mount, path_connected allows those cases to be detected.
@ -1083,6 +1085,7 @@ fs_initcall(init_fs_namei_sysctls);
/**
* may_follow_link - Check symlink following for unsafe situations
* @nd: nameidata pathwalk data
* @inode: Used for idmapping.
*
* In the case of the sysctl_protected_symlinks sysctl being enabled,
* CAP_DAC_OVERRIDE needs to be specifically ignored if the symlink is
@ -2890,7 +2893,7 @@ int path_pts(struct path *path)
dput(path->dentry);
path->dentry = parent;
child = d_hash_and_lookup(parent, &this);
if (!child)
if (IS_ERR_OR_NULL(child))
return -ENOENT;
path->dentry = child;

2
fs/nfs/nfs4_fs.h
View File

@ -328,7 +328,7 @@ extern int update_open_stateid(struct nfs4_state *state,
const nfs4_stateid *open_stateid,
const nfs4_stateid *deleg_stateid,
fmode_t fmode);
extern int nfs4_proc_setlease(struct file *file, long arg,
extern int nfs4_proc_setlease(struct file *file, int arg,
struct file_lock **lease, void **priv);
extern int nfs4_proc_get_lease_time(struct nfs_client *clp,
struct nfs_fsinfo *fsinfo);

2
fs/nfs/nfs4file.c
View File

@ -438,7 +438,7 @@ void nfs42_ssc_unregister_ops(void)
}
#endif /* CONFIG_NFS_V4_2 */
static int nfs4_setlease(struct file *file, long arg, struct file_lock **lease,
static int nfs4_setlease(struct file *file, int arg, struct file_lock **lease,
void **priv)
{
return nfs4_proc_setlease(file, arg, lease, priv);

4
fs/nfs/nfs4proc.c
View File

@ -7579,7 +7579,7 @@ static int nfs4_delete_lease(struct file *file, void **priv)
return generic_setlease(file, F_UNLCK, NULL, priv);
}
static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
static int nfs4_add_lease(struct file *file, int arg, struct file_lock **lease,
void **priv)
{
struct inode *inode = file_inode(file);
@ -7597,7 +7597,7 @@ static int nfs4_add_lease(struct file *file, long arg, struct file_lock **lease,
return -EAGAIN;
}
int nfs4_proc_setlease(struct file *file, long arg, struct file_lock **lease,
int nfs4_proc_setlease(struct file *file, int arg, struct file_lock **lease,
void **priv)
{
switch (arg) {

4
fs/notify/dnotify/dnotify.c
View File

@ -199,7 +199,7 @@ void dnotify_flush(struct file *filp, fl_owner_t id)
}
/* this conversion is done only at watch creation */
static __u32 convert_arg(unsigned long arg)
static __u32 convert_arg(unsigned int arg)
{
__u32 new_mask = FS_EVENT_ON_CHILD;
@ -258,7 +258,7 @@ static int attach_dn(struct dnotify_struct *dn, struct dnotify_mark *dn_mark,
* up here. Allocate both a mark for fsnotify to add and a dnotify_struct to be
* attached to the fsnotify_mark.
*/
int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
int fcntl_dirnotify(int fd, struct file *filp, unsigned int arg)
{
struct dnotify_mark *new_dn_mark, *dn_mark;
struct fsnotify_mark *new_fsn_mark, *fsn_mark;

31
fs/open.c
View File

@ -1150,7 +1150,7 @@ EXPORT_SYMBOL_GPL(kernel_file_open);
* backing_file_open - open a backing file for kernel internal use
* @path: path of the file to open
* @flags: open flags
* @path: path of the backing file
* @real_path: path of the backing file
* @cred: credentials for open
*
* Open a backing file for a stackable filesystem (e.g., overlayfs).
@ -1503,7 +1503,7 @@ SYSCALL_DEFINE2(creat, const char __user *, pathname, umode_t, mode)
* "id" is the POSIX thread ID. We use the
* files pointer for this..
*/
int filp_close(struct file *filp, fl_owner_t id)
static int filp_flush(struct file *filp, fl_owner_t id)
{
int retval = 0;
@ -1520,10 +1520,18 @@ int filp_close(struct file *filp, fl_owner_t id)
dnotify_flush(filp, id);
locks_remove_posix(filp, id);
}
fput(filp);
return retval;
}
int filp_close(struct file *filp, fl_owner_t id)
{
int retval;
retval = filp_flush(filp, id);
fput(filp);
return retval;
}
EXPORT_SYMBOL(filp_close);
/*
@ -1533,7 +1541,20 @@ EXPORT_SYMBOL(filp_close);
*/
SYSCALL_DEFINE1(close, unsigned int, fd)
{
int retval = close_fd(fd);
int retval;
struct file *file;
file = close_fd_get_file(fd);
if (!file)
return -EBADF;
retval = filp_flush(file, current->files);
/*
* We're returning to user space. Don't bother
* with any delayed fput() cases.
*/
__fput_sync(file);
/* can't restart close syscall because file table entry was cleared */
if (unlikely(retval == -ERESTARTSYS ||
@ -1546,7 +1567,7 @@ SYSCALL_DEFINE1(close, unsigned int, fd)
}
/**
* close_range() - Close all file descriptors in a given range.
* sys_close_range() - Close all file descriptors in a given range.
*
* @fd: starting file descriptor to close
* @max_fd: last file descriptor to close

10
fs/overlayfs/file.c
View File

@ -293,10 +293,7 @@ static void ovl_aio_cleanup_handler(struct ovl_aio_req *aio_req)
if (iocb->ki_flags & IOCB_WRITE) {
struct inode *inode = file_inode(orig_iocb->ki_filp);
/* Actually acquired in ovl_write_iter() */
__sb_writers_acquired(file_inode(iocb->ki_filp)->i_sb,
SB_FREEZE_WRITE);
file_end_write(iocb->ki_filp);
kiocb_end_write(iocb);
ovl_copyattr(inode);
}
@ -412,10 +409,6 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
if (!aio_req)
goto out;
file_start_write(real.file);
/* Pacify lockdep, same trick as done in aio_write() */
__sb_writers_release(file_inode(real.file)->i_sb,
SB_FREEZE_WRITE);
aio_req->fd = real;
real.flags = 0;
aio_req->orig_iocb = iocb;
@ -423,6 +416,7 @@ static ssize_t ovl_write_iter(struct kiocb *iocb, struct iov_iter *iter)
aio_req->iocb.ki_flags = ifl;
aio_req->iocb.ki_complete = ovl_aio_rw_complete;
refcount_set(&aio_req->ref, 2);
kiocb_start_write(&aio_req->iocb);
ret = vfs_iocb_iter_write(real.file, &aio_req->iocb, iter);
ovl_aio_put(aio_req);
if (ret != -EIOCBQUEUED)

8
fs/pipe.c
View File

@ -489,7 +489,7 @@ pipe_write(struct kiocb *iocb, struct iov_iter *from)
head = pipe->head;
if (!pipe_full(head, pipe->tail, pipe->max_usage)) {
unsigned int mask = pipe->ring_size - 1;
struct pipe_buffer *buf = &pipe->bufs[head & mask];
struct pipe_buffer *buf;
struct page *page = pipe->tmp_page;
int copied;
@ -1236,7 +1236,7 @@ const struct file_operations pipefifo_fops = {
* Currently we rely on the pipe array holding a power-of-2 number
* of pages. Returns 0 on error.
*/
unsigned int round_pipe_size(unsigned long size)
unsigned int round_pipe_size(unsigned int size)
{
if (size > (1U << 31))
return 0;
@ -1319,7 +1319,7 @@ int pipe_resize_ring(struct pipe_inode_info *pipe, unsigned int nr_slots)
* Allocate a new array of pipe buffers and copy the info over. Returns the
* pipe size if successful, or return -ERROR on error.
*/
static long pipe_set_size(struct pipe_inode_info *pipe, unsigned long arg)
static long pipe_set_size(struct pipe_inode_info *pipe, unsigned int arg)
{
unsigned long user_bufs;
unsigned int nr_slots, size;
@ -1387,7 +1387,7 @@ struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice)
return pipe;
}
long pipe_fcntl(struct file *file, unsigned int cmd, unsigned long arg)
long pipe_fcntl(struct file *file, unsigned int cmd, unsigned int arg)
{
struct pipe_inode_info *pipe;
long ret;

2
fs/read_write.c
View File

@ -71,7 +71,7 @@ EXPORT_SYMBOL(vfs_setpos);
* @file: file structure to seek on
* @offset: file offset to seek to
* @whence: type of seek
* @size: max size of this file in file system
* @maxsize: max size of this file in file system
* @eof: offset used for SEEK_END position
*
* This is a variant of generic_file_llseek that allows passing in a custom

4
fs/reiserfs/journal.c
View File

@ -2326,7 +2326,7 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev,
int i, j;
bh = __getblk(dev, block, bufsize);
if (buffer_uptodate(bh))
if (!bh || buffer_uptodate(bh))
return (bh);
if (block + BUFNR > max_block) {
@ -2336,6 +2336,8 @@ static struct buffer_head *reiserfs_breada(struct block_device *dev,
j = 1;
for (i = 1; i < blocks; i++) {
bh = __getblk(dev, block + i, bufsize);
if (!bh)
break;
if (buffer_uptodate(bh)) {
brelse(bh);
break;

2
fs/smb/client/cifsfs.c
View File

@ -1077,7 +1077,7 @@ static loff_t cifs_llseek(struct file *file, loff_t offset, int whence)
}
static int
cifs_setlease(struct file *file, long arg, struct file_lock **lease, void **priv)
cifs_setlease(struct file *file, int arg, struct file_lock **lease, void **priv)
{
/*
* Note that this is called by vfs setlease with i_lock held to

66
fs/splice.c
View File

@ -120,17 +120,17 @@ static void page_cache_pipe_buf_release(struct pipe_inode_info *pipe,
static int page_cache_pipe_buf_confirm(struct pipe_inode_info *pipe,
struct pipe_buffer *buf)
{
struct page *page = buf->page;
struct folio *folio = page_folio(buf->page);
int err;
if (!PageUptodate(page)) {
lock_page(page);
if (!folio_test_uptodate(folio)) {
folio_lock(folio);
/*
* Page got truncated/unhashed. This will cause a 0-byte
* Folio got truncated/unhashed. This will cause a 0-byte
* splice, if this is the first page.
*/
if (!page->mapping) {
if (!folio->mapping) {
err = -ENODATA;
goto error;
}
@ -138,20 +138,18 @@ static int page_cache_pipe_buf_confirm(struct pipe_inode_info *pipe,
/*
* Uh oh, read-error from disk.
*/
if (!PageUptodate(page)) {
if (!folio_test_uptodate(folio)) {
err = -EIO;
goto error;
}
/*
* Page is ok afterall, we are done.
*/
unlock_page(page);
/* Folio is ok after all, we are done */
folio_unlock(folio);
}
return 0;
error:
unlock_page(page);
folio_unlock(folio);
return err;
}
@ -1269,10 +1267,8 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
if ((in->f_flags | out->f_flags) & O_NONBLOCK)
flags |= SPLICE_F_NONBLOCK;
return splice_pipe_to_pipe(ipipe, opipe, len, flags);
}
if (ipipe) {
ret = splice_pipe_to_pipe(ipipe, opipe, len, flags);
} else if (ipipe) {
if (off_in)
return -ESPIPE;
if (off_out) {
@ -1297,18 +1293,11 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
ret = do_splice_from(ipipe, out, &offset, len, flags);
file_end_write(out);
if (ret > 0)
fsnotify_modify(out);
if (!off_out)
out->f_pos = offset;
else
*off_out = offset;
return ret;
}
if (opipe) {
} else if (opipe) {
if (off_out)
return -ESPIPE;
if (off_in) {
@ -1324,18 +1313,25 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
ret = splice_file_to_pipe(in, opipe, &offset, len, flags);
if (ret > 0)
fsnotify_access(in);
if (!off_in)
in->f_pos = offset;
else
*off_in = offset;
return ret;
} else {
ret = -EINVAL;
}
return -EINVAL;
if (ret > 0) {
/*
* Generate modify out before access in:
* do_splice_from() may've already sent modify out,
* and this ensures the events get merged.
*/
fsnotify_modify(out);
fsnotify_access(in);
}
return ret;
}
static long __do_splice(struct file *in, loff_t __user *off_in,
@ -1464,6 +1460,9 @@ static long vmsplice_to_user(struct file *file, struct iov_iter *iter,
pipe_unlock(pipe);
}
if (ret > 0)
fsnotify_access(file);
return ret;
}
@ -1493,8 +1492,10 @@ static long vmsplice_to_pipe(struct file *file, struct iov_iter *iter,
if (!ret)
ret = iter_to_pipe(iter, pipe, buf_flag);
pipe_unlock(pipe);
if (ret > 0)
if (ret > 0) {
wakeup_pipe_readers(pipe);
fsnotify_modify(file);
}
return ret;
}
@ -1928,6 +1929,11 @@ long do_tee(struct file *in, struct file *out, size_t len, unsigned int flags)
}
}
if (ret > 0) {
fsnotify_access(in);
fsnotify_modify(out);
}
return ret;
}

4
include/linux/dnotify.h
View File

@ -30,7 +30,7 @@ struct dnotify_struct {
FS_MOVED_FROM | FS_MOVED_TO)
extern void dnotify_flush(struct file *, fl_owner_t);
extern int fcntl_dirnotify(int, struct file *, unsigned long);
extern int fcntl_dirnotify(int, struct file *, unsigned int);
#else
@ -38,7 +38,7 @@ static inline void dnotify_flush(struct file *filp, fl_owner_t id)
{
}
static inline int fcntl_dirnotify(int fd, struct file *filp, unsigned long arg)
static inline int fcntl_dirnotify(int fd, struct file *filp, unsigned int arg)
{
return -EINVAL;
}

12
include/linux/filelock.h
View File

@ -144,7 +144,7 @@ int fcntl_setlk64(unsigned int, struct file *, unsigned int,
struct flock64 *);
#endif
int fcntl_setlease(unsigned int fd, struct file *filp, long arg);
int fcntl_setlease(unsigned int fd, struct file *filp, int arg);
int fcntl_getlease(struct file *filp);
/* fs/locks.c */
@ -167,8 +167,8 @@ bool vfs_inode_has_locks(struct inode *inode);
int locks_lock_inode_wait(struct inode *inode, struct file_lock *fl);
int __break_lease(struct inode *inode, unsigned int flags, unsigned int type);
void lease_get_mtime(struct inode *, struct timespec64 *time);
int generic_setlease(struct file *, long, struct file_lock **, void **priv);
int vfs_setlease(struct file *, long, struct file_lock **, void **);
int generic_setlease(struct file *, int, struct file_lock **, void **priv);
int vfs_setlease(struct file *, int, struct file_lock **, void **);
int lease_modify(struct file_lock *, int, struct list_head *);
struct notifier_block;
@ -213,7 +213,7 @@ static inline int fcntl_setlk64(unsigned int fd, struct file *file,
return -EACCES;
}
#endif
static inline int fcntl_setlease(unsigned int fd, struct file *filp, long arg)
static inline int fcntl_setlease(unsigned int fd, struct file *filp, int arg)
{
return -EINVAL;
}
@ -306,13 +306,13 @@ static inline void lease_get_mtime(struct inode *inode,
return;
}
static inline int generic_setlease(struct file *filp, long arg,
static inline int generic_setlease(struct file *filp, int arg,
struct file_lock **flp, void **priv)
{
return -EINVAL;
}
static inline int vfs_setlease(struct file *filp, long arg,
static inline int vfs_setlease(struct file *filp, int arg,
struct file_lock **lease, void **priv)
{
return -EINVAL;

60
include/linux/fs.h
View File

@ -1069,7 +1069,7 @@ extern void fasync_free(struct fasync_struct *);
extern void kill_fasync(struct fasync_struct **, int, int);
extern void __f_setown(struct file *filp, struct pid *, enum pid_type, int force);
extern int f_setown(struct file *filp, unsigned long arg, int force);
extern int f_setown(struct file *filp, int who, int force);
extern void f_delown(struct file *filp);
extern pid_t f_getown(struct file *filp);
extern int send_sigurg(struct fown_struct *fown);
@ -1871,7 +1871,7 @@ struct file_operations {
ssize_t (*splice_write)(struct pipe_inode_info *, struct file *, loff_t *, size_t, unsigned int);
ssize_t (*splice_read)(struct file *, loff_t *, struct pipe_inode_info *, size_t, unsigned int);
void (*splice_eof)(struct file *file);
int (*setlease)(struct file *, long, struct file_lock **, void **);
int (*setlease)(struct file *, int, struct file_lock **, void **);
long (*fallocate)(struct file *file, int mode, loff_t offset,
loff_t len);
void (*show_fdinfo)(struct seq_file *m, struct file *f);
@ -2632,6 +2632,13 @@ static inline bool inode_wrong_type(const struct inode *inode, umode_t mode)
return (inode->i_mode ^ mode) & S_IFMT;
}
/**
* file_start_write - get write access to a superblock for regular file io
* @file: the file we want to write to
*
* This is a variant of sb_start_write() which is a noop on non-regualr file.
* Should be matched with a call to file_end_write().
*/
static inline void file_start_write(struct file *file)
{
if (!S_ISREG(file_inode(file)->i_mode))
@ -2646,11 +2653,53 @@ static inline bool file_start_write_trylock(struct file *file)
return sb_start_write_trylock(file_inode(file)->i_sb);
}
/**
* file_end_write - drop write access to a superblock of a regular file
* @file: the file we wrote to
*
* Should be matched with a call to file_start_write().
*/
static inline void file_end_write(struct file *file)
{
if (!S_ISREG(file_inode(file)->i_mode))
return;
__sb_end_write(file_inode(file)->i_sb, SB_FREEZE_WRITE);
sb_end_write(file_inode(file)->i_sb);
}
/**
* kiocb_start_write - get write access to a superblock for async file io
* @iocb: the io context we want to submit the write with
*
* This is a variant of sb_start_write() for async io submission.
* Should be matched with a call to kiocb_end_write().
*/
static inline void kiocb_start_write(struct kiocb *iocb)
{
struct inode *inode = file_inode(iocb->ki_filp);
sb_start_write(inode->i_sb);
/*
* Fool lockdep by telling it the lock got released so that it
* doesn't complain about the held lock when we return to userspace.
*/
__sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);
}
/**
* kiocb_end_write - drop write access to a superblock after async file io
* @iocb: the io context we sumbitted the write with
*
* Should be matched with a call to kiocb_start_write().
*/
static inline void kiocb_end_write(struct kiocb *iocb)
{
struct inode *inode = file_inode(iocb->ki_filp);
/*
* Tell lockdep we inherited freeze protection from submission thread.
*/
__sb_writers_acquired(inode->i_sb, SB_FREEZE_WRITE);
sb_end_write(inode->i_sb);
}
/*
@ -2700,8 +2749,7 @@ static inline bool inode_is_open_for_write(const struct inode *inode)
#if defined(CONFIG_IMA) || defined(CONFIG_FILE_LOCKING)
static inline void i_readcount_dec(struct inode *inode)
{
BUG_ON(!atomic_read(&inode->i_readcount));
atomic_dec(&inode->i_readcount);
BUG_ON(atomic_dec_return(&inode->i_readcount) < 0);
}
static inline void i_readcount_inc(struct inode *inode)
{
@ -3046,7 +3094,7 @@ extern int simple_write_begin(struct file *file, struct address_space *mapping,
extern const struct address_space_operations ram_aops;
extern int always_delete_dentry(const struct dentry *);
extern struct inode *alloc_anon_inode(struct super_block *);
extern int simple_nosetlease(struct file *, long, struct file_lock **, void **);
extern int simple_nosetlease(struct file *, int, struct file_lock **, void **);
extern const struct dentry_operations simple_dentry_operations;
extern struct dentry *simple_lookup(struct inode *, struct dentry *, unsigned int flags);

1
include/linux/lsm_hook_defs.h
View File

@ -54,6 +54,7 @@ LSM_HOOK(int, 0, bprm_creds_from_file, struct linux_binprm *bprm, struct file *f
LSM_HOOK(int, 0, bprm_check_security, struct linux_binprm *bprm)
LSM_HOOK(void, LSM_RET_VOID, bprm_committing_creds, struct linux_binprm *bprm)
LSM_HOOK(void, LSM_RET_VOID, bprm_committed_creds, struct linux_binprm *bprm)
LSM_HOOK(int, 0, fs_context_submount, struct fs_context *fc, struct super_block *reference)
LSM_HOOK(int, 0, fs_context_dup, struct fs_context *fc,
struct fs_context *src_sc)
LSM_HOOK(int, -ENOPARAM, fs_context_parse_param, struct fs_context *fc,

4
include/linux/pipe_fs_i.h
View File

@ -269,10 +269,10 @@ bool pipe_is_unprivileged_user(void);
/* for F_SETPIPE_SZ and F_GETPIPE_SZ */
int pipe_resize_ring(struct pipe_inode_info *pipe, unsigned int nr_slots);
long pipe_fcntl(struct file *, unsigned int, unsigned long arg);
long pipe_fcntl(struct file *, unsigned int, unsigned int arg);
struct pipe_inode_info *get_pipe_info(struct file *file, bool for_splice);
int create_pipe_files(struct file **, int);
unsigned int round_pipe_size(unsigned long size);
unsigned int round_pipe_size(unsigned int size);
#endif

6
include/linux/security.h
View File

@ -293,6 +293,7 @@ int security_bprm_creds_from_file(struct linux_binprm *bprm, struct file *file);
int security_bprm_check(struct linux_binprm *bprm);
void security_bprm_committing_creds(struct linux_binprm *bprm);
void security_bprm_committed_creds(struct linux_binprm *bprm);
int security_fs_context_submount(struct fs_context *fc, struct super_block *reference);
int security_fs_context_dup(struct fs_context *fc, struct fs_context *src_fc);
int security_fs_context_parse_param(struct fs_context *fc, struct fs_parameter *param);
int security_sb_alloc(struct super_block *sb);
@ -629,6 +630,11 @@ static inline void security_bprm_committed_creds(struct linux_binprm *bprm)
{
}
static inline int security_fs_context_submount(struct fs_context *fc,
struct super_block *reference)
{
return 0;
}
static inline int security_fs_context_dup(struct fs_context *fc,
struct fs_context *src_fc)
{

38
init/do_mounts.c
View File

@ -18,6 +18,7 @@
#include <linux/slab.h>
#include <linux/ramfs.h>
#include <linux/shmem_fs.h>
#include <linux/ktime.h>
#include <linux/nfs_fs.h>
#include <linux/nfs_fs_sb.h>
@ -71,12 +72,37 @@ static int __init rootwait_setup(char *str)
{
if (*str)
return 0;
root_wait = 1;
root_wait = -1;
return 1;
}
__setup("rootwait", rootwait_setup);
static int __init rootwait_timeout_setup(char *str)
{
int sec;
if (kstrtoint(str, 0, &sec) || sec < 0) {
pr_warn("ignoring invalid rootwait value\n");
goto ignore;
}
if (check_mul_overflow(sec, MSEC_PER_SEC, &root_wait)) {
pr_warn("ignoring excessive rootwait value\n");
goto ignore;
}
return 1;
ignore:
/* Fallback to indefinite wait */
root_wait = -1;
return 1;
}
__setup("rootwait=", rootwait_timeout_setup);
static char * __initdata root_mount_data;
static int __init root_data_setup(char *str)
{
@ -384,14 +410,22 @@ void __init mount_root(char *root_device_name)
/* wait for any asynchronous scanning to complete */
static void __init wait_for_root(char *root_device_name)
{
ktime_t end;
if (ROOT_DEV != 0)
return;
pr_info("Waiting for root device %s...\n", root_device_name);
end = ktime_add_ms(ktime_get_raw(), root_wait);
while (!driver_probe_done() ||
early_lookup_bdev(root_device_name, &ROOT_DEV) < 0)
early_lookup_bdev(root_device_name, &ROOT_DEV) < 0) {
msleep(5);
if (root_wait > 0 && ktime_after(ktime_get_raw(), end))
break;
}
async_synchronize_full();
}

33
io_uring/rw.c
View File

@ -220,17 +220,12 @@ static bool io_rw_should_reissue(struct io_kiocb *req)
}
#endif
static void kiocb_end_write(struct io_kiocb *req)
static void io_req_end_write(struct io_kiocb *req)
{
/*
* Tell lockdep we inherited freeze protection from submission
* thread.
*/
if (req->flags & REQ_F_ISREG) {
struct super_block *sb = file_inode(req->file)->i_sb;
struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw);
__sb_writers_acquired(sb, SB_FREEZE_WRITE);
sb_end_write(sb);
kiocb_end_write(&rw->kiocb);
}
}
@ -243,7 +238,7 @@ static void io_req_io_end(struct io_kiocb *req)
struct io_rw *rw = io_kiocb_to_cmd(req, struct io_rw);
if (rw->kiocb.ki_flags & IOCB_WRITE) {
kiocb_end_write(req);
io_req_end_write(req);
fsnotify_modify(req->file);
} else {
fsnotify_access(req->file);
@ -313,7 +308,7 @@ static void io_complete_rw_iopoll(struct kiocb *kiocb, long res)
struct io_kiocb *req = cmd_to_io_kiocb(rw);
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
io_req_end_write(req);
if (unlikely(res != req->cqe.res)) {
if (res == -EAGAIN && io_rw_should_reissue(req)) {
req->flags |= REQ_F_REISSUE | REQ_F_PARTIAL_IO;
@ -902,18 +897,8 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
return ret;
}
/*
* Open-code file_start_write here to grab freeze protection,
* which will be released by another thread in
* io_complete_rw(). Fool lockdep by telling it the lock got
* released so that it doesn't complain about the held lock when
* we return to userspace.
*/
if (req->flags & REQ_F_ISREG) {
sb_start_write(file_inode(req->file)->i_sb);
__sb_writers_release(file_inode(req->file)->i_sb,
SB_FREEZE_WRITE);
}
if (req->flags & REQ_F_ISREG)
kiocb_start_write(kiocb);
kiocb->ki_flags |= IOCB_WRITE;
if (likely(req->file->f_op->write_iter))
@ -961,7 +946,7 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
io->bytes_done += ret2;
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
io_req_end_write(req);
return ret ? ret : -EAGAIN;
}
done:
@ -972,7 +957,7 @@ copy_iov:
ret = io_setup_async_rw(req, iovec, s, false);
if (!ret) {
if (kiocb->ki_flags & IOCB_WRITE)
kiocb_end_write(req);
io_req_end_write(req);
return -EAGAIN;
}
return ret;

14
security/security.c
View File

@ -1138,6 +1138,20 @@ void security_bprm_committed_creds(struct linux_binprm *bprm)
call_void_hook(bprm_committed_creds, bprm);
}
/**
* security_fs_context_submount() - Initialise fc->security
* @fc: new filesystem context
* @reference: dentry reference for submount/remount
*
* Fill out the ->security field for a new fs_context.
*
* Return: Returns 0 on success or negative error code on failure.
*/
int security_fs_context_submount(struct fs_context *fc, struct super_block *reference)
{
return call_int_hook(fs_context_submount, 0, fc, reference);
}
/**
* security_fs_context_dup() - Duplicate a fs_context LSM blob
* @fc: destination filesystem context

22
security/selinux/hooks.c
View File

@ -2745,6 +2745,27 @@ static int selinux_umount(struct vfsmount *mnt, int flags)
FILESYSTEM__UNMOUNT, NULL);
}
static int selinux_fs_context_submount(struct fs_context *fc,
struct super_block *reference)
{
const struct superblock_security_struct *sbsec;
struct selinux_mnt_opts *opts;
opts = kzalloc(sizeof(*opts), GFP_KERNEL);
if (!opts)
return -ENOMEM;
sbsec = selinux_superblock(reference);
if (sbsec->flags & FSCONTEXT_MNT)
opts->fscontext_sid = sbsec->sid;
if (sbsec->flags & CONTEXT_MNT)
opts->context_sid = sbsec->mntpoint_sid;
if (sbsec->flags & DEFCONTEXT_MNT)
opts->defcontext_sid = sbsec->def_sid;
fc->security = opts;
return 0;
}
static int selinux_fs_context_dup(struct fs_context *fc,
struct fs_context *src_fc)
{
@ -7182,6 +7203,7 @@ static struct security_hook_list selinux_hooks[] __ro_after_init = {
/*
* PUT "CLONING" (ACCESSING + ALLOCATING) HOOKS HERE
*/
LSM_HOOK_INIT(fs_context_submount, selinux_fs_context_submount),
LSM_HOOK_INIT(fs_context_dup, selinux_fs_context_dup),
LSM_HOOK_INIT(fs_context_parse_param, selinux_fs_context_parse_param),
LSM_HOOK_INIT(sb_eat_lsm_opts, selinux_sb_eat_lsm_opts),

51
security/smack/smack_lsm.c
View File

@ -614,6 +614,56 @@ out_opt_err:
return -EINVAL;
}
/**
* smack_fs_context_submount - Initialise security data for a filesystem context
* @fc: The filesystem context.
* @reference: reference superblock
*
* Returns 0 on success or -ENOMEM on error.
*/
static int smack_fs_context_submount(struct fs_context *fc,
struct super_block *reference)
{
struct superblock_smack *sbsp;
struct smack_mnt_opts *ctx;
struct inode_smack *isp;
ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
fc->security = ctx;
sbsp = smack_superblock(reference);
isp = smack_inode(reference->s_root->d_inode);
if (sbsp->smk_default) {
ctx->fsdefault = kstrdup(sbsp->smk_default->smk_known, GFP_KERNEL);
if (!ctx->fsdefault)
return -ENOMEM;
}
if (sbsp->smk_floor) {
ctx->fsfloor = kstrdup(sbsp->smk_floor->smk_known, GFP_KERNEL);
if (!ctx->fsfloor)
return -ENOMEM;
}
if (sbsp->smk_hat) {
ctx->fshat = kstrdup(sbsp->smk_hat->smk_known, GFP_KERNEL);
if (!ctx->fshat)
return -ENOMEM;
}
if (isp->smk_flags & SMK_INODE_TRANSMUTE) {
if (sbsp->smk_root) {
ctx->fstransmute = kstrdup(sbsp->smk_root->smk_known, GFP_KERNEL);
if (!ctx->fstransmute)
return -ENOMEM;
}
}
return 0;
}
/**
* smack_fs_context_dup - Duplicate the security data on fs_context duplication
* @fc: The new filesystem context.
@ -4876,6 +4926,7 @@ static struct security_hook_list smack_hooks[] __ro_after_init = {
LSM_HOOK_INIT(ptrace_traceme, smack_ptrace_traceme),
LSM_HOOK_INIT(syslog, smack_syslog),
LSM_HOOK_INIT(fs_context_submount, smack_fs_context_submount),
LSM_HOOK_INIT(fs_context_dup, smack_fs_context_dup),
LSM_HOOK_INIT(fs_context_parse_param, smack_fs_context_parse_param),