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Diffstat (limited to 'fs')
-rw-r--r--fs/aio.c8
-rw-r--r--fs/anon_inodes.c3
-rw-r--r--fs/binfmt_misc.c2
-rw-r--r--fs/file_table.c46
-rw-r--r--fs/hugetlbfs/inode.c3
-rw-r--r--fs/internal.h6
-rw-r--r--fs/namei.c45
-rw-r--r--fs/open.c92
-rw-r--r--fs/overlayfs/readdir.c19
-rw-r--r--fs/pipe.c15
-rw-r--r--fs/proc/generic.c11
11 files changed, 116 insertions, 134 deletions
diff --git a/fs/aio.c b/fs/aio.c
index e1d20124ec0e..9eea53887d6c 100644
--- a/fs/aio.c
+++ b/fs/aio.c
@@ -234,13 +234,9 @@ static struct file *aio_private_file(struct kioctx *ctx, loff_t nr_pages)
path.mnt = mntget(aio_mnt);
d_instantiate(path.dentry, inode);
- file = alloc_file(&path, FMODE_READ | FMODE_WRITE, &aio_ring_fops);
- if (IS_ERR(file)) {
+ file = alloc_file(&path, O_RDWR, &aio_ring_fops);
+ if (IS_ERR(file))
path_put(&path);
- return file;
- }
-
- file->f_flags = O_RDWR;
return file;
}
diff --git a/fs/anon_inodes.c b/fs/anon_inodes.c
index 3168ee4e77f4..6b235ab1df6c 100644
--- a/fs/anon_inodes.c
+++ b/fs/anon_inodes.c
@@ -102,12 +102,11 @@ struct file *anon_inode_getfile(const char *name,
d_instantiate(path.dentry, anon_inode_inode);
- file = alloc_file(&path, OPEN_FMODE(flags), fops);
+ file = alloc_file(&path, flags & (O_ACCMODE | O_NONBLOCK), fops);
if (IS_ERR(file))
goto err_dput;
file->f_mapping = anon_inode_inode->i_mapping;
- file->f_flags = flags & (O_ACCMODE | O_NONBLOCK);
file->private_data = priv;
return file;
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c
index 4b5fff31ef27..aa4a7a23ff99 100644
--- a/fs/binfmt_misc.c
+++ b/fs/binfmt_misc.c
@@ -205,7 +205,7 @@ static int load_misc_binary(struct linux_binprm *bprm)
goto error;
if (fmt->flags & MISC_FMT_OPEN_FILE) {
- interp_file = filp_clone_open(fmt->interp_file);
+ interp_file = file_clone_open(fmt->interp_file);
if (!IS_ERR(interp_file))
deny_write_access(interp_file);
} else {
diff --git a/fs/file_table.c b/fs/file_table.c
index 7ec0b3e5f05d..9b70ed2bbc4e 100644
--- a/fs/file_table.c
+++ b/fs/file_table.c
@@ -51,6 +51,7 @@ static void file_free_rcu(struct rcu_head *head)
static inline void file_free(struct file *f)
{
+ security_file_free(f);
percpu_counter_dec(&nr_files);
call_rcu(&f->f_u.fu_rcuhead, file_free_rcu);
}
@@ -100,9 +101,8 @@ int proc_nr_files(struct ctl_table *table, int write,
* done, you will imbalance int the mount's writer count
* and a warning at __fput() time.
*/
-struct file *get_empty_filp(void)
+struct file *alloc_empty_file(int flags, const struct cred *cred)
{
- const struct cred *cred = current_cred();
static long old_max;
struct file *f;
int error;
@@ -123,11 +123,10 @@ struct file *get_empty_filp(void)
if (unlikely(!f))
return ERR_PTR(-ENOMEM);
- percpu_counter_inc(&nr_files);
f->f_cred = get_cred(cred);
error = security_file_alloc(f);
if (unlikely(error)) {
- file_free(f);
+ file_free_rcu(&f->f_u.fu_rcuhead);
return ERR_PTR(error);
}
@@ -136,7 +135,10 @@ struct file *get_empty_filp(void)
spin_lock_init(&f->f_lock);
mutex_init(&f->f_pos_lock);
eventpoll_init_file(f);
+ f->f_flags = flags;
+ f->f_mode = OPEN_FMODE(flags);
/* f->f_version: 0 */
+ percpu_counter_inc(&nr_files);
return f;
over:
@@ -152,15 +154,15 @@ over:
* alloc_file - allocate and initialize a 'struct file'
*
* @path: the (dentry, vfsmount) pair for the new file
- * @mode: the mode with which the new file will be opened
+ * @flags: O_... flags with which the new file will be opened
* @fop: the 'struct file_operations' for the new file
*/
-struct file *alloc_file(const struct path *path, fmode_t mode,
+struct file *alloc_file(const struct path *path, int flags,
const struct file_operations *fop)
{
struct file *file;
- file = get_empty_filp();
+ file = alloc_empty_file(flags, current_cred());
if (IS_ERR(file))
return file;
@@ -168,15 +170,15 @@ struct file *alloc_file(const struct path *path, fmode_t mode,
file->f_inode = path->dentry->d_inode;
file->f_mapping = path->dentry->d_inode->i_mapping;
file->f_wb_err = filemap_sample_wb_err(file->f_mapping);
- if ((mode & FMODE_READ) &&
+ if ((file->f_mode & FMODE_READ) &&
likely(fop->read || fop->read_iter))
- mode |= FMODE_CAN_READ;
- if ((mode & FMODE_WRITE) &&
+ file->f_mode |= FMODE_CAN_READ;
+ if ((file->f_mode & FMODE_WRITE) &&
likely(fop->write || fop->write_iter))
- mode |= FMODE_CAN_WRITE;
- file->f_mode = mode;
+ file->f_mode |= FMODE_CAN_WRITE;
+ file->f_mode |= FMODE_OPENED;
file->f_op = fop;
- if ((mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
+ if ((file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_inc(path->dentry->d_inode);
return file;
}
@@ -190,6 +192,9 @@ static void __fput(struct file *file)
struct vfsmount *mnt = file->f_path.mnt;
struct inode *inode = file->f_inode;
+ if (unlikely(!(file->f_mode & FMODE_OPENED)))
+ goto out;
+
might_sleep();
fsnotify_close(file);
@@ -207,7 +212,6 @@ static void __fput(struct file *file)
}
if (file->f_op->release)
file->f_op->release(inode, file);
- security_file_free(file);
if (unlikely(S_ISCHR(inode->i_mode) && inode->i_cdev != NULL &&
!(file->f_mode & FMODE_PATH))) {
cdev_put(inode->i_cdev);
@@ -220,12 +224,10 @@ static void __fput(struct file *file)
put_write_access(inode);
__mnt_drop_write(mnt);
}
- file->f_path.dentry = NULL;
- file->f_path.mnt = NULL;
- file->f_inode = NULL;
- file_free(file);
dput(dentry);
mntput(mnt);
+out:
+ file_free(file);
}
static LLIST_HEAD(delayed_fput_list);
@@ -300,14 +302,6 @@ void __fput_sync(struct file *file)
EXPORT_SYMBOL(fput);
-void put_filp(struct file *file)
-{
- if (atomic_long_dec_and_test(&file->f_count)) {
- security_file_free(file);
- file_free(file);
- }
-}
-
void __init files_init(void)
{
filp_cachep = kmem_cache_create("filp", sizeof(struct file), 0,
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index d508c7844681..71aed47422e2 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1375,8 +1375,7 @@ struct file *hugetlb_file_setup(const char *name, size_t size,
inode->i_size = size;
clear_nlink(inode);
- file = alloc_file(&path, FMODE_WRITE | FMODE_READ,
- &hugetlbfs_file_operations);
+ file = alloc_file(&path, O_RDWR, &hugetlbfs_file_operations);
if (IS_ERR(file))
goto out_dentry; /* inode is already attached */
diff --git a/fs/internal.h b/fs/internal.h
index 980d005b21b4..52a346903748 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -93,7 +93,7 @@ extern void chroot_fs_refs(const struct path *, const struct path *);
/*
* file_table.c
*/
-extern struct file *get_empty_filp(void);
+extern struct file *alloc_empty_file(int, const struct cred *);
/*
* super.c
@@ -125,9 +125,7 @@ int do_fchmodat(int dfd, const char __user *filename, umode_t mode);
int do_fchownat(int dfd, const char __user *filename, uid_t user, gid_t group,
int flag);
-extern int open_check_o_direct(struct file *f);
-extern int vfs_open(const struct path *, struct file *, const struct cred *);
-extern struct file *filp_clone_open(struct file *);
+extern int vfs_open(const struct path *, struct file *);
/*
* inode.c
diff --git a/fs/namei.c b/fs/namei.c
index 734cef54fdf8..d152cc05fdc3 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3396,19 +3396,15 @@ finish_open_created:
if (error)
goto out;
BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
- error = vfs_open(&nd->path, file, current_cred());
+ error = vfs_open(&nd->path, file);
if (error)
goto out;
*opened |= FILE_OPENED;
opened:
- error = open_check_o_direct(file);
- if (!error)
- error = ima_file_check(file, op->acc_mode, *opened);
+ error = ima_file_check(file, op->acc_mode, *opened);
if (!error && will_truncate)
error = handle_truncate(file);
out:
- if (unlikely(error) && (*opened & FILE_OPENED))
- fput(file);
if (unlikely(error > 0)) {
WARN_ON(1);
error = -EINVAL;
@@ -3481,11 +3477,6 @@ static int do_tmpfile(struct nameidata *nd, unsigned flags,
goto out2;
file->f_path.mnt = path.mnt;
error = finish_open(file, child, NULL, opened);
- if (error)
- goto out2;
- error = open_check_o_direct(file);
- if (error)
- fput(file);
out2:
mnt_drop_write(path.mnt);
out:
@@ -3499,7 +3490,7 @@ static int do_o_path(struct nameidata *nd, unsigned flags, struct file *file)
int error = path_lookupat(nd, flags, &path);
if (!error) {
audit_inode(nd->name, path.dentry, 0);
- error = vfs_open(&path, file, current_cred());
+ error = vfs_open(&path, file);
path_put(&path);
}
return error;
@@ -3513,12 +3504,10 @@ static struct file *path_openat(struct nameidata *nd,
int opened = 0;
int error;
- file = get_empty_filp();
+ file = alloc_empty_file(op->open_flag, current_cred());
if (IS_ERR(file))
return file;
- file->f_flags = op->open_flag;
-
if (unlikely(file->f_flags & __O_TMPFILE)) {
error = do_tmpfile(nd, flags, op, file, &opened);
goto out2;
@@ -3533,7 +3522,7 @@ static struct file *path_openat(struct nameidata *nd,
s = path_init(nd, flags);
if (IS_ERR(s)) {
- put_filp(file);
+ fput(file);
return ERR_CAST(s);
}
while (!(error = link_path_walk(s, nd)) &&
@@ -3547,20 +3536,20 @@ static struct file *path_openat(struct nameidata *nd,
}
terminate_walk(nd);
out2:
- if (!(opened & FILE_OPENED)) {
- BUG_ON(!error);
- put_filp(file);
+ if (likely(!error)) {
+ if (likely(opened & FILE_OPENED))
+ return file;
+ WARN_ON(1);
+ error = -EINVAL;
}
- if (unlikely(error)) {
- if (error == -EOPENSTALE) {
- if (flags & LOOKUP_RCU)
- error = -ECHILD;
- else
- error = -ESTALE;
- }
- file = ERR_PTR(error);
+ fput(file);
+ if (error == -EOPENSTALE) {
+ if (flags & LOOKUP_RCU)
+ error = -ECHILD;
+ else
+ error = -ESTALE;
}
- return file;
+ return ERR_PTR(error);
}
struct file *do_filp_open(int dfd, struct filename *pathname,
diff --git a/fs/open.c b/fs/open.c
index d0e955b558ad..dd15711eb658 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -724,27 +724,13 @@ SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
return ksys_fchown(fd, user, group);
}
-int open_check_o_direct(struct file *f)
-{
- /* NB: we're sure to have correct a_ops only after f_op->open */
- if (f->f_flags & O_DIRECT) {
- if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO)
- return -EINVAL;
- }
- return 0;
-}
-
static int do_dentry_open(struct file *f,
struct inode *inode,
- int (*open)(struct inode *, struct file *),
- const struct cred *cred)
+ int (*open)(struct inode *, struct file *))
{
static const struct file_operations empty_fops = {};
int error;
- f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
- FMODE_PREAD | FMODE_PWRITE;
-
path_get(&f->f_path);
f->f_inode = inode;
f->f_mapping = inode->i_mapping;
@@ -753,7 +739,7 @@ static int do_dentry_open(struct file *f,
f->f_wb_err = filemap_sample_wb_err(f->f_mapping);
if (unlikely(f->f_flags & O_PATH)) {
- f->f_mode = FMODE_PATH;
+ f->f_mode = FMODE_PATH | FMODE_OPENED;
f->f_op = &empty_fops;
return 0;
}
@@ -780,7 +766,7 @@ static int do_dentry_open(struct file *f,
goto cleanup_all;
}
- error = security_file_open(f, cred);
+ error = security_file_open(f);
if (error)
goto cleanup_all;
@@ -788,6 +774,8 @@ static int do_dentry_open(struct file *f,
if (error)
goto cleanup_all;
+ /* normally all 3 are set; ->open() can clear them if needed */
+ f->f_mode |= FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE;
if (!open)
open = f->f_op->open;
if (open) {
@@ -795,6 +783,7 @@ static int do_dentry_open(struct file *f,
if (error)
goto cleanup_all;
}
+ f->f_mode |= FMODE_OPENED;
if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
i_readcount_inc(inode);
if ((f->f_mode & FMODE_READ) &&
@@ -809,9 +798,16 @@ static int do_dentry_open(struct file *f,
file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
+ /* NB: we're sure to have correct a_ops only after f_op->open */
+ if (f->f_flags & O_DIRECT) {
+ if (!f->f_mapping->a_ops || !f->f_mapping->a_ops->direct_IO)
+ return -EINVAL;
+ }
return 0;
cleanup_all:
+ if (WARN_ON_ONCE(error > 0))
+ error = -EINVAL;
fops_put(f->f_op);
if (f->f_mode & FMODE_WRITER) {
put_write_access(inode);
@@ -854,8 +850,7 @@ int finish_open(struct file *file, struct dentry *dentry,
BUG_ON(*opened & FILE_OPENED); /* once it's opened, it's opened */
file->f_path.dentry = dentry;
- error = do_dentry_open(file, d_backing_inode(dentry), open,
- current_cred());
+ error = do_dentry_open(file, d_backing_inode(dentry), open);
if (!error)
*opened |= FILE_OPENED;
@@ -896,8 +891,7 @@ EXPORT_SYMBOL(file_path);
* @file: newly allocated file with f_flag initialized
* @cred: credentials to use
*/
-int vfs_open(const struct path *path, struct file *file,
- const struct cred *cred)
+int vfs_open(const struct path *path, struct file *file)
{
struct dentry *dentry = d_real(path->dentry, NULL, file->f_flags, 0);
@@ -905,7 +899,7 @@ int vfs_open(const struct path *path, struct file *file,
return PTR_ERR(dentry);
file->f_path = *path;
- return do_dentry_open(file, d_backing_inode(dentry), NULL, cred);
+ return do_dentry_open(file, d_backing_inode(dentry), NULL);
}
struct file *dentry_open(const struct path *path, int flags,
@@ -919,19 +913,11 @@ struct file *dentry_open(const struct path *path, int flags,
/* We must always pass in a valid mount pointer. */
BUG_ON(!path->mnt);
- f = get_empty_filp();
+ f = alloc_empty_file(flags, cred);
if (!IS_ERR(f)) {
- f->f_flags = flags;
- error = vfs_open(path, f, cred);
- if (!error) {
- /* from now on we need fput() to dispose of f */
- error = open_check_o_direct(f);
- if (error) {
- fput(f);
- f = ERR_PTR(error);
- }
- } else {
- put_filp(f);
+ error = vfs_open(path, f);
+ if (error) {
+ fput(f);
f = ERR_PTR(error);
}
}
@@ -939,6 +925,24 @@ struct file *dentry_open(const struct path *path, int flags,
}
EXPORT_SYMBOL(dentry_open);
+struct file *open_with_fake_path(const struct path *path, int flags,
+ struct inode *inode, const struct cred *cred)
+{
+ struct file *f = alloc_empty_file(flags, cred);
+ if (!IS_ERR(f)) {
+ int error;
+
+ f->f_path = *path;
+ error = do_dentry_open(f, inode, NULL);
+ if (error) {
+ fput(f);
+ f = ERR_PTR(error);
+ }
+ }
+ return f;
+}
+EXPORT_SYMBOL(open_with_fake_path);
+
static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op)
{
int lookup_flags = 0;
@@ -1063,26 +1067,6 @@ struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
}
EXPORT_SYMBOL(file_open_root);
-struct file *filp_clone_open(struct file *oldfile)
-{
- struct file *file;
- int retval;
-
- file = get_empty_filp();
- if (IS_ERR(file))
- return file;
-
- file->f_flags = oldfile->f_flags;
- retval = vfs_open(&oldfile->f_path, file, oldfile->f_cred);
- if (retval) {
- put_filp(file);
- return ERR_PTR(retval);
- }
-
- return file;
-}
-EXPORT_SYMBOL(filp_clone_open);
-
long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)
{
struct open_flags op;
diff --git a/fs/overlayfs/readdir.c b/fs/overlayfs/readdir.c
index ef1fe42ff7bb..cc8303a806b4 100644
--- a/fs/overlayfs/readdir.c
+++ b/fs/overlayfs/readdir.c
@@ -668,6 +668,21 @@ static int ovl_fill_real(struct dir_context *ctx, const char *name,
return orig_ctx->actor(orig_ctx, name, namelen, offset, ino, d_type);
}
+static bool ovl_is_impure_dir(struct file *file)
+{
+ struct ovl_dir_file *od = file->private_data;
+ struct inode *dir = d_inode(file->f_path.dentry);
+
+ /*
+ * Only upper dir can be impure, but if we are in the middle of
+ * iterating a lower real dir, dir could be copied up and marked
+ * impure. We only want the impure cache if we started iterating
+ * a real upper dir to begin with.
+ */
+ return od->is_upper && ovl_test_flag(OVL_IMPURE, dir);
+
+}
+
static int ovl_iterate_real(struct file *file, struct dir_context *ctx)
{
int err;
@@ -696,7 +711,7 @@ static int ovl_iterate_real(struct file *file, struct dir_context *ctx)
rdt.parent_ino = stat.ino;
}
- if (ovl_test_flag(OVL_IMPURE, d_inode(dir))) {
+ if (ovl_is_impure_dir(file)) {
rdt.cache = ovl_cache_get_impure(&file->f_path);
if (IS_ERR(rdt.cache))
return PTR_ERR(rdt.cache);
@@ -727,7 +742,7 @@ static int ovl_iterate(struct file *file, struct dir_context *ctx)
*/
if (ovl_xino_bits(dentry->d_sb) ||
(ovl_same_sb(dentry->d_sb) &&
- (ovl_test_flag(OVL_IMPURE, d_inode(dentry)) ||
+ (ovl_is_impure_dir(file) ||
OVL_TYPE_MERGE(ovl_path_type(dentry->d_parent))))) {
return ovl_iterate_real(file, ctx);
}
diff --git a/fs/pipe.c b/fs/pipe.c
index bb0840e234f3..1909422e5a78 100644
--- a/fs/pipe.c
+++ b/fs/pipe.c
@@ -760,29 +760,28 @@ int create_pipe_files(struct file **res, int flags)
d_instantiate(path.dentry, inode);
- f = alloc_file(&path, FMODE_WRITE, &pipefifo_fops);
+ f = alloc_file(&path, O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT)),
+ &pipefifo_fops);
if (IS_ERR(f)) {
err = PTR_ERR(f);
goto err_dentry;
}
- f->f_flags = O_WRONLY | (flags & (O_NONBLOCK | O_DIRECT));
f->private_data = inode->i_pipe;
- res[0] = alloc_file(&path, FMODE_READ, &pipefifo_fops);
+ res[0] = alloc_file(&path, O_RDONLY | (flags & O_NONBLOCK),
+ &pipefifo_fops);
if (IS_ERR(res[0])) {
- err = PTR_ERR(res[0]);
- goto err_file;
+ put_pipe_info(inode, inode->i_pipe);
+ fput(f);
+ return PTR_ERR(res[0]);
}
path_get(&path);
res[0]->private_data = inode->i_pipe;
- res[0]->f_flags = O_RDONLY | (flags & O_NONBLOCK);
res[1] = f;
return 0;
-err_file:
- put_filp(f);
err_dentry:
free_pipe_info(inode->i_pipe);
path_put(&path);
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index 6ac1c92997ea..bb1c1625b158 100644
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -564,11 +564,20 @@ static int proc_seq_open(struct inode *inode, struct file *file)
return seq_open(file, de->seq_ops);
}
+static int proc_seq_release(struct inode *inode, struct file *file)
+{
+ struct proc_dir_entry *de = PDE(inode);
+
+ if (de->state_size)
+ return seq_release_private(inode, file);
+ return seq_release(inode, file);
+}
+
static const struct file_operations proc_seq_fops = {
.open = proc_seq_open,
.read = seq_read,
.llseek = seq_lseek,
- .release = seq_release,
+ .release = proc_seq_release,
};
struct proc_dir_entry *proc_create_seq_private(const char *name, umode_t mode,
generated by cgit v1.2.3 (git 2.39.0) at 2024-07-08 16:49:59 +0300