![]() Why?: There are occasions where userspace would like to access sysfs attributes for a device but it may not know how sysfs has named the device or the path. For example what is the sysfs path for /dev/disk/by-id/ata-ST3160827AS_5MT004CK? With this change a call to stat(2) returns the major:minor then userspace can see that /sys/dev/block/8:32 links to /sys/block/sdc. What are the alternatives?: 1/ Add an ioctl to return the path: Doable, but sysfs is meant to reduce the need to proliferate ioctl interfaces into the kernel, so this seems counter productive. 2/ Use udev to create these symlinks: Also doable, but it adds a udev dependency to utilities that might be running in a limited environment like an initramfs. 3/ Do a full-tree search of sysfs. [kay.sievers@vrfy.org: fix duplicate registrations] [kay.sievers@vrfy.org: cleanup suggestions] Cc: Neil Brown <neilb@suse.de> Cc: Tejun Heo <htejun@gmail.com> Acked-by: Kay Sievers <kay.sievers@vrfy.org> Reviewed-by: SL Baur <steve@xemacs.org> Acked-by: Kay Sievers <kay.sievers@vrfy.org> Acked-by: Mark Lord <lkml@rtr.ca> Acked-by: H. Peter Anvin <hpa@zytor.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de> |
||
---|---|---|
.. | ||
configfs | ||
00-INDEX | ||
9p.txt | ||
Exporting | ||
Locking | ||
adfs.txt | ||
affs.txt | ||
afs.txt | ||
automount-support.txt | ||
befs.txt | ||
bfs.txt | ||
cifs.txt | ||
coda.txt | ||
cramfs.txt | ||
dentry-locking.txt | ||
directory-locking | ||
dlmfs.txt | ||
dnotify.txt | ||
ecryptfs.txt | ||
ext2.txt | ||
ext3.txt | ||
ext4.txt | ||
files.txt | ||
fuse.txt | ||
gfs2-glocks.txt | ||
gfs2.txt | ||
hfs.txt | ||
hfsplus.txt | ||
hpfs.txt | ||
inotify.txt | ||
isofs.txt | ||
jfs.txt | ||
locks.txt | ||
mandatory-locking.txt | ||
ncpfs.txt | ||
nfs-rdma.txt | ||
nfsroot.txt | ||
ntfs.txt | ||
ocfs2.txt | ||
porting | ||
proc.txt | ||
quota.txt | ||
ramfs-rootfs-initramfs.txt | ||
relay.txt | ||
romfs.txt | ||
rpc-cache.txt | ||
seq_file.txt | ||
sharedsubtree.txt | ||
smbfs.txt | ||
spufs.txt | ||
sysfs-pci.txt | ||
sysfs.txt | ||
sysv-fs.txt | ||
tmpfs.txt | ||
ubifs.txt | ||
udf.txt | ||
ufs.txt | ||
vfat.txt | ||
vfs.txt | ||
xfs.txt | ||
xip.txt |