diff options
Diffstat (limited to 'fs/open.c')
-rw-r--r-- | fs/open.c | 82 |
1 files changed, 60 insertions, 22 deletions
diff --git a/fs/open.c b/fs/open.c index d54301219d04..1540632d8387 100644 --- a/fs/open.c +++ b/fs/open.c @@ -397,10 +397,10 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd) { struct file *file; struct inode *inode; - int error; + int error, fput_needed; error = -EBADF; - file = fget(fd); + file = fget_raw_light(fd, &fput_needed); if (!file) goto out; @@ -414,7 +414,7 @@ SYSCALL_DEFINE1(fchdir, unsigned int, fd) if (!error) set_fs_pwd(current->fs, &file->f_path); out_putf: - fput(file); + fput_light(file, fput_needed); out: return error; } @@ -654,10 +654,23 @@ static inline int __get_file_write_access(struct inode *inode, return error; } -static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt, - struct file *f, - int (*open)(struct inode *, struct file *), - const struct cred *cred) +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) && + (!f->f_mapping->a_ops->get_xip_mem))) { + return -EINVAL; + } + } + return 0; +} + +static struct file *do_dentry_open(struct dentry *dentry, struct vfsmount *mnt, + struct file *f, + int (*open)(struct inode *, struct file *), + const struct cred *cred) { static const struct file_operations empty_fops = {}; struct inode *inode; @@ -713,16 +726,6 @@ static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt, 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) && - (!f->f_mapping->a_ops->get_xip_mem))) { - fput(f); - f = ERR_PTR(-EINVAL); - } - } - return f; cleanup_all: @@ -744,12 +747,29 @@ cleanup_all: f->f_path.dentry = NULL; f->f_path.mnt = NULL; cleanup_file: - put_filp(f); dput(dentry); mntput(mnt); return ERR_PTR(error); } +static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt, + struct file *f, + int (*open)(struct inode *, struct file *), + const struct cred *cred) +{ + struct file *res = do_dentry_open(dentry, mnt, f, open, cred); + if (!IS_ERR(res)) { + int error = open_check_o_direct(f); + if (error) { + fput(res); + res = ERR_PTR(error); + } + } else { + put_filp(f); + } + return res; +} + /** * lookup_instantiate_filp - instantiates the open intent filp * @nd: pointer to nameidata @@ -804,13 +824,31 @@ struct file *nameidata_to_filp(struct nameidata *nd) /* Pick up the filp from the open intent */ filp = nd->intent.open.file; - nd->intent.open.file = NULL; /* Has the filesystem initialised the file for us? */ - if (filp->f_path.dentry == NULL) { + if (filp->f_path.dentry != NULL) { + nd->intent.open.file = NULL; + } else { + struct file *res; + path_get(&nd->path); - filp = __dentry_open(nd->path.dentry, nd->path.mnt, filp, - NULL, cred); + res = do_dentry_open(nd->path.dentry, nd->path.mnt, + filp, NULL, cred); + if (!IS_ERR(res)) { + int error; + + nd->intent.open.file = NULL; + BUG_ON(res != filp); + + error = open_check_o_direct(filp); + if (error) { + fput(filp); + filp = ERR_PTR(error); + } + } else { + /* Allow nd->intent.open.file to be recycled */ + filp = res; + } } return filp; } |