Loading fs/file.c +106 −0 Original line number Diff line number Diff line Loading @@ -625,3 +625,109 @@ void fd_install(unsigned int fd, struct file *file) } EXPORT_SYMBOL(fd_install); struct file *fget(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (file->f_mode & FMODE_PATH || !atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget); struct file *fget_raw(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (!atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget_raw); /* * Lightweight file lookup - no refcnt increment if fd table isn't shared. * * You can use this instead of fget if you satisfy all of the following * conditions: * 1) You must call fput_light before exiting the syscall and returning control * to userspace (i.e. you cannot remember the returned struct file * after * returning to userspace). * 2) You must not call filp_close on the returned struct file * in between * calls to fget_light and fput_light. * 3) You must not clone the current task in between the calls to fget_light * and fput_light. * * The fput_needed flag returned by fget_light should be passed to the * corresponding fput_light. */ struct file *fget_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); if (file && (file->f_mode & FMODE_PATH)) file = NULL; } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (!(file->f_mode & FMODE_PATH) && atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; } struct file *fget_raw_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; } fs/file_table.c +0 −106 Original line number Diff line number Diff line Loading @@ -339,112 +339,6 @@ void __fput_sync(struct file *file) EXPORT_SYMBOL(fput); struct file *fget(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (file->f_mode & FMODE_PATH || !atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget); struct file *fget_raw(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (!atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget_raw); /* * Lightweight file lookup - no refcnt increment if fd table isn't shared. * * You can use this instead of fget if you satisfy all of the following * conditions: * 1) You must call fput_light before exiting the syscall and returning control * to userspace (i.e. you cannot remember the returned struct file * after * returning to userspace). * 2) You must not call filp_close on the returned struct file * in between * calls to fget_light and fput_light. * 3) You must not clone the current task in between the calls to fget_light * and fput_light. * * The fput_needed flag returned by fget_light should be passed to the * corresponding fput_light. */ struct file *fget_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); if (file && (file->f_mode & FMODE_PATH)) file = NULL; } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (!(file->f_mode & FMODE_PATH) && atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; } struct file *fget_raw_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; } void put_filp(struct file *file) { if (atomic_long_dec_and_test(&file->f_count)) { Loading Loading
fs/file.c +106 −0 Original line number Diff line number Diff line Loading @@ -625,3 +625,109 @@ void fd_install(unsigned int fd, struct file *file) } EXPORT_SYMBOL(fd_install); struct file *fget(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (file->f_mode & FMODE_PATH || !atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget); struct file *fget_raw(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (!atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget_raw); /* * Lightweight file lookup - no refcnt increment if fd table isn't shared. * * You can use this instead of fget if you satisfy all of the following * conditions: * 1) You must call fput_light before exiting the syscall and returning control * to userspace (i.e. you cannot remember the returned struct file * after * returning to userspace). * 2) You must not call filp_close on the returned struct file * in between * calls to fget_light and fput_light. * 3) You must not clone the current task in between the calls to fget_light * and fput_light. * * The fput_needed flag returned by fget_light should be passed to the * corresponding fput_light. */ struct file *fget_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); if (file && (file->f_mode & FMODE_PATH)) file = NULL; } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (!(file->f_mode & FMODE_PATH) && atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; } struct file *fget_raw_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; }
fs/file_table.c +0 −106 Original line number Diff line number Diff line Loading @@ -339,112 +339,6 @@ void __fput_sync(struct file *file) EXPORT_SYMBOL(fput); struct file *fget(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (file->f_mode & FMODE_PATH || !atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget); struct file *fget_raw(unsigned int fd) { struct file *file; struct files_struct *files = current->files; rcu_read_lock(); file = fcheck_files(files, fd); if (file) { /* File object ref couldn't be taken */ if (!atomic_long_inc_not_zero(&file->f_count)) file = NULL; } rcu_read_unlock(); return file; } EXPORT_SYMBOL(fget_raw); /* * Lightweight file lookup - no refcnt increment if fd table isn't shared. * * You can use this instead of fget if you satisfy all of the following * conditions: * 1) You must call fput_light before exiting the syscall and returning control * to userspace (i.e. you cannot remember the returned struct file * after * returning to userspace). * 2) You must not call filp_close on the returned struct file * in between * calls to fget_light and fput_light. * 3) You must not clone the current task in between the calls to fget_light * and fput_light. * * The fput_needed flag returned by fget_light should be passed to the * corresponding fput_light. */ struct file *fget_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); if (file && (file->f_mode & FMODE_PATH)) file = NULL; } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (!(file->f_mode & FMODE_PATH) && atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; } struct file *fget_raw_light(unsigned int fd, int *fput_needed) { struct file *file; struct files_struct *files = current->files; *fput_needed = 0; if (atomic_read(&files->count) == 1) { file = fcheck_files(files, fd); } else { rcu_read_lock(); file = fcheck_files(files, fd); if (file) { if (atomic_long_inc_not_zero(&file->f_count)) *fput_needed = 1; else /* Didn't get the reference, someone's freed */ file = NULL; } rcu_read_unlock(); } return file; } void put_filp(struct file *file) { if (atomic_long_dec_and_test(&file->f_count)) { Loading
Al Viro <viro@zeniv.linux.org.uk>Al Viro <viro@zeniv.linux.org.uk>