Re: did vfs_read or something related to it get broken?
Answer: No nothing got broken except the driver itself. On Fri, Jun 30, 2017 at 4:10 PM, David F.wrote: > Hi, > > I have a driver that reads data from a file that has worked from > kernel 3.x up to 4.9.13. I haven't tried all the other 4.9's or 4.10, > or 4.11.6 or earlier, but in 4.11.7 it's now broken and an error is > returned. It's based on > http://krishnamohanlinux.blogspot.com/2013/12/how-to-write-to-file-from-kernel-module.html > > Is there a new requirement of some sort or did it get broken? > > int driver_file_read(struct file *file, unsigned char *data, unsigned int > size) > { > int ret; > mm_segment_t oldfs; > > // get file pointer > loff_t pos = file->f_pos; > > oldfs = get_fs(); > set_fs(get_ds()); > > ret=vfs_read(file, data, size, ); > > set_fs(oldfs); > > // update file pointer > file->f_pos=pos; > >return (ret); > } > > > struct file *driver_file_open(const char *path, int flags, int mode, int *err) > { > int ec=0; > struct file *filp = NULL; > filp=filp_open(path, flags, mode); > if (IS_ERR(filp)) { > ec=PTR_ERR(filp); > filp=NULL; > } > // update callers error code > if (err) { > *err=ec; > } > // return pointer to file > return (filp); > }
Re: did vfs_read or something related to it get broken?
Answer: No nothing got broken except the driver itself. On Fri, Jun 30, 2017 at 4:10 PM, David F. wrote: > Hi, > > I have a driver that reads data from a file that has worked from > kernel 3.x up to 4.9.13. I haven't tried all the other 4.9's or 4.10, > or 4.11.6 or earlier, but in 4.11.7 it's now broken and an error is > returned. It's based on > http://krishnamohanlinux.blogspot.com/2013/12/how-to-write-to-file-from-kernel-module.html > > Is there a new requirement of some sort or did it get broken? > > int driver_file_read(struct file *file, unsigned char *data, unsigned int > size) > { > int ret; > mm_segment_t oldfs; > > // get file pointer > loff_t pos = file->f_pos; > > oldfs = get_fs(); > set_fs(get_ds()); > > ret=vfs_read(file, data, size, ); > > set_fs(oldfs); > > // update file pointer > file->f_pos=pos; > >return (ret); > } > > > struct file *driver_file_open(const char *path, int flags, int mode, int *err) > { > int ec=0; > struct file *filp = NULL; > filp=filp_open(path, flags, mode); > if (IS_ERR(filp)) { > ec=PTR_ERR(filp); > filp=NULL; > } > // update callers error code > if (err) { > *err=ec; > } > // return pointer to file > return (filp); > }
did vfs_read or something related to it get broken?
Hi, I have a driver that reads data from a file that has worked from kernel 3.x up to 4.9.13. I haven't tried all the other 4.9's or 4.10, or 4.11.6 or earlier, but in 4.11.7 it's now broken and an error is returned. It's based on http://krishnamohanlinux.blogspot.com/2013/12/how-to-write-to-file-from-kernel-module.html Is there a new requirement of some sort or did it get broken? int driver_file_read(struct file *file, unsigned char *data, unsigned int size) { int ret; mm_segment_t oldfs; // get file pointer loff_t pos = file->f_pos; oldfs = get_fs(); set_fs(get_ds()); ret=vfs_read(file, data, size, ); set_fs(oldfs); // update file pointer file->f_pos=pos; return (ret); } struct file *driver_file_open(const char *path, int flags, int mode, int *err) { int ec=0; struct file *filp = NULL; filp=filp_open(path, flags, mode); if (IS_ERR(filp)) { ec=PTR_ERR(filp); filp=NULL; } // update callers error code if (err) { *err=ec; } // return pointer to file return (filp); }
did vfs_read or something related to it get broken?
Hi, I have a driver that reads data from a file that has worked from kernel 3.x up to 4.9.13. I haven't tried all the other 4.9's or 4.10, or 4.11.6 or earlier, but in 4.11.7 it's now broken and an error is returned. It's based on http://krishnamohanlinux.blogspot.com/2013/12/how-to-write-to-file-from-kernel-module.html Is there a new requirement of some sort or did it get broken? int driver_file_read(struct file *file, unsigned char *data, unsigned int size) { int ret; mm_segment_t oldfs; // get file pointer loff_t pos = file->f_pos; oldfs = get_fs(); set_fs(get_ds()); ret=vfs_read(file, data, size, ); set_fs(oldfs); // update file pointer file->f_pos=pos; return (ret); } struct file *driver_file_open(const char *path, int flags, int mode, int *err) { int ec=0; struct file *filp = NULL; filp=filp_open(path, flags, mode); if (IS_ERR(filp)) { ec=PTR_ERR(filp); filp=NULL; } // update callers error code if (err) { *err=ec; } // return pointer to file return (filp); }