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parted.15765
libparted-Use-read-only-when-probing-devices-on...
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File libparted-Use-read-only-when-probing-devices-on-linu.patch of Package parted.15765
From: "Brian C. Lane" <bcl@redhat.com> Date: Thu, 6 Aug 2015 07:17:14 -0700 Subject: libparted: Use read only when probing devices on linux Patch-mainline: v3.3 Git-commit: 44d5ae0115c4ecfe3158748309e9912c5aede92d When a device is opened for RW closing it can trigger other actions, like udev scanning it for partition changes. Use read only for the init_* methods and RW for actual changes to the device. This adds _device_open which takes mode flags as an argument and turns linux_open into a wrapper for it with RW_MODE. _device_open_ro is added to open the device with RD_MODE and increment the open_counter. This is used in the init_* functions. _device_close is a wrapper around linux_close that decrements the open_counter and is used in the init_* functions. All of these changes are self-contained with no external API changes. The only visible change in behavior is that when a new PedDevice is created the device is opened in RO_MODE instead of RW_MODE. Resolves: rhbz#1245144 --- libparted/arch/linux.c | 62 ++++++++++++++++++++++++++++++++++--------------- 1 file changed, 44 insertions(+), 18 deletions(-) Index: parted-3.2/libparted/arch/linux.c =================================================================== --- parted-3.2.orig/libparted/arch/linux.c +++ parted-3.2/libparted/arch/linux.c @@ -292,7 +292,9 @@ struct blkdev_ioctl_param { static char* _device_get_part_path (PedDevice const *dev, int num); static int _partition_is_mounted_by_path (const char* path); static unsigned int _device_get_partition_range(PedDevice const* dev); - +static int _device_open (PedDevice* dev, int flags); +static int _device_open_ro (PedDevice* dev); +static int _device_close (PedDevice* dev); static int _read_fd (int fd, char **buf) @@ -911,7 +913,7 @@ init_ide (PedDevice* dev) if (!_device_stat (dev, &dev_stat)) goto error; - if (!ped_device_open (dev)) + if (!_device_open_ro (dev)) goto error; if (ioctl (arch_specific->fd, HDIO_GET_IDENTITY, &hdi)) { @@ -980,11 +982,11 @@ init_ide (PedDevice* dev) if (!_device_probe_geometry (dev)) goto error_close_dev; - ped_device_close (dev); + _device_close (dev); return 1; error_close_dev: - ped_device_close (dev); + _device_close (dev); error: return 0; } @@ -1117,7 +1119,7 @@ init_scsi (PedDevice* dev) char* vendor; char* product; - if (!ped_device_open (dev)) + if (!_device_open_ro (dev)) goto error; if (ioctl (arch_specific->fd, SCSI_IOCTL_GET_IDLUN, &idlun) < 0) { @@ -1131,7 +1133,7 @@ init_scsi (PedDevice* dev) goto error_close_dev; if (!_device_probe_geometry (dev)) goto error_close_dev; - ped_device_close (dev); + _device_close (dev); return 1; } @@ -1153,11 +1155,11 @@ init_scsi (PedDevice* dev) if (!_device_probe_geometry (dev)) goto error_close_dev; - ped_device_close (dev); + _device_close (dev); return 1; error_close_dev: - ped_device_close (dev); + _device_close (dev); error: return 0; } @@ -1169,7 +1171,7 @@ init_file (PedDevice* dev) if (!_device_stat (dev, &dev_stat)) goto error; - if (!ped_device_open (dev)) + if (!_device_open_ro (dev)) goto error; dev->sector_size = PED_SECTOR_SIZE_DEFAULT; @@ -1196,7 +1198,7 @@ init_file (PedDevice* dev) goto error_close_dev; } - ped_device_close (dev); + _device_close (dev); dev->bios_geom.cylinders = dev->length / 4 / 32; dev->bios_geom.heads = 4; @@ -1207,7 +1209,7 @@ init_file (PedDevice* dev) return 1; error_close_dev: - ped_device_close (dev); + _device_close (dev); error: return 0; } @@ -1223,7 +1225,7 @@ init_dasd (PedDevice* dev, const char* m if (!_device_stat (dev, &dev_stat)) goto error; - if (!ped_device_open (dev)) + if (!_device_open_ro (dev)) goto error; LinuxSpecific* arch_specific = LINUX_SPECIFIC (dev); @@ -1263,11 +1265,11 @@ init_dasd (PedDevice* dev, const char* m dev->model = strdup (model_name); - ped_device_close (dev); + _device_close (dev); return 1; error_close_dev: - ped_device_close (dev); + _device_close (dev); error: return 0; } @@ -1282,7 +1284,7 @@ init_generic (PedDevice* dev, const char if (!_device_stat (dev, &dev_stat)) goto error; - if (!ped_device_open (dev)) + if (!_device_open_ro (dev)) goto error; ped_exception_fetch_all (); @@ -1330,11 +1332,11 @@ init_generic (PedDevice* dev, const char dev->model = strdup (model_name); - ped_device_close (dev); + _device_close (dev); return 1; error_close_dev: - ped_device_close (dev); + _device_close (dev); error: return 0; } @@ -1621,12 +1623,27 @@ retry: } static int +_device_open_ro (PedDevice* dev) +{ + int rc = _device_open (dev, RD_MODE); + if (rc) + dev->open_count++; + return rc; +} + +static int linux_open (PedDevice* dev) { + return _device_open (dev, RW_MODE); +} + +static int +_device_open (PedDevice* dev, int flags) +{ LinuxSpecific* arch_specific = LINUX_SPECIFIC (dev); retry: - arch_specific->fd = open (dev->path, RW_MODE); + arch_specific->fd = open (dev->path, flags); if (arch_specific->fd == -1) { char* rw_error_msg = strerror (errno); @@ -1695,6 +1712,15 @@ linux_refresh_close (PedDevice* dev) return 1; } +static int +_device_close (PedDevice* dev) +{ + int rc = linux_close (dev); + if (dev->open_count > 0) + dev->open_count--; + return rc; +} + #if SIZEOF_OFF_T < 8 static _syscall5(int,_llseek,
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