Can a filesystem ever be specified by its mount point?
Clash Royale CLAN TAG#URR8PPP
Is it correct that for an umounted filesystem, the only way to specify it is to specify its underlying partition?
For a mounted filesystem, can we specify it by either specifying its underlying partition or specifying its mount point? In particular, can a filesystem ever be specified by its mount point?
Thanks.
filesystems
asked Feb 21 at 19:34
TimTim
27.8k78269486
|
show 3 more comments
Is it correct that for an umounted filesystem, the only way to specify it is to specify its underlying partition?
For a mounted filesystem, can we specify it by either specifying its underlying partition or specifying its mount point? In particular, can a filesystem ever be specified by its mount point?
Thanks.
filesystems
asked Feb 21 at 19:34
TimTim
27.8k78269486
What Unix are you referring to? Linux only?
– Kusalananda
Feb 21 at 19:56
I have never used Unix. I am not sure if it is different in Unix.
– Tim
Feb 21 at 20:01
@Tim Gnu/Linux (e.g. Debian, Ubuntu, Centos, Suse, …) is Unix. However it is not UNIX. The title for site is miss-leading. (Also Linux is a kernel, not an OS, it can be part of a Unix OS e.g. Gnu/Linux, or a not Unix OS. Gnu is a Unix OS and has many kernels: Linux, Hurd, BSD, cygwin (A MS-Windows dll), LSW (another MS-Windows thing).
– ctrl-alt-delor
Feb 21 at 21:22
It is unclear what context you are asking. What you are saying about mount-point or partition-device is true of theumountcommand, but will not be true of all commands.
– ctrl-alt-delor
Feb 21 at 21:23
@ctrl Can you be specific about "What you are saying about mount-point or partition-device is true of the umount command, but will not be true of all commands"? Maybe in a reply?
– Tim
Feb 21 at 21:25
|
show 3 more comments
Is it correct that for an umounted filesystem, the only way to specify it is to specify its underlying partition?
For a mounted filesystem, can we specify it by either specifying its underlying partition or specifying its mount point? In particular, can a filesystem ever be specified by its mount point?
Thanks.
filesystems
asked Feb 21 at 19:34
TimTim
27.8k78269486
Is it correct that for an umounted filesystem, the only way to specify it is to specify its underlying partition?
For a mounted filesystem, can we specify it by either specifying its underlying partition or specifying its mount point? In particular, can a filesystem ever be specified by its mount point?
Thanks.
filesystems
filesystems
asked Feb 21 at 19:34
TimTim
27.8k78269486
asked Feb 21 at 19:34
TimTim
27.8k78269486
asked Feb 21 at 19:34
TimTim
27.8k78269486
asked Feb 21 at 19:34
TimTim
27.8k78269486
asked Feb 21 at 19:34
TimTim
27.8k78269486
27.8k78269486
What Unix are you referring to? Linux only?
– Kusalananda
Feb 21 at 19:56
I have never used Unix. I am not sure if it is different in Unix.
– Tim
Feb 21 at 20:01
@Tim Gnu/Linux (e.g. Debian, Ubuntu, Centos, Suse, …) is Unix. However it is not UNIX. The title for site is miss-leading. (Also Linux is a kernel, not an OS, it can be part of a Unix OS e.g. Gnu/Linux, or a not Unix OS. Gnu is a Unix OS and has many kernels: Linux, Hurd, BSD, cygwin (A MS-Windows dll), LSW (another MS-Windows thing).
– ctrl-alt-delor
Feb 21 at 21:22
It is unclear what context you are asking. What you are saying about mount-point or partition-device is true of theumountcommand, but will not be true of all commands.
– ctrl-alt-delor
Feb 21 at 21:23
@ctrl Can you be specific about "What you are saying about mount-point or partition-device is true of the umount command, but will not be true of all commands"? Maybe in a reply?
– Tim
Feb 21 at 21:25
|
show 3 more comments
What Unix are you referring to? Linux only?
– Kusalananda
Feb 21 at 19:56
I have never used Unix. I am not sure if it is different in Unix.
– Tim
Feb 21 at 20:01
@Tim Gnu/Linux (e.g. Debian, Ubuntu, Centos, Suse, …) is Unix. However it is not UNIX. The title for site is miss-leading. (Also Linux is a kernel, not an OS, it can be part of a Unix OS e.g. Gnu/Linux, or a not Unix OS. Gnu is a Unix OS and has many kernels: Linux, Hurd, BSD, cygwin (A MS-Windows dll), LSW (another MS-Windows thing).
– ctrl-alt-delor
Feb 21 at 21:22
It is unclear what context you are asking. What you are saying about mount-point or partition-device is true of theumountcommand, but will not be true of all commands.
– ctrl-alt-delor
Feb 21 at 21:23
@ctrl Can you be specific about "What you are saying about mount-point or partition-device is true of the umount command, but will not be true of all commands"? Maybe in a reply?
– Tim
Feb 21 at 21:25
What Unix are you referring to? Linux only?
– Kusalananda
Feb 21 at 19:56
What Unix are you referring to? Linux only?
– Kusalananda
Feb 21 at 19:56
I have never used Unix. I am not sure if it is different in Unix.
– Tim
Feb 21 at 20:01
I have never used Unix. I am not sure if it is different in Unix.
– Tim
Feb 21 at 20:01
@Tim Gnu/Linux (e.g. Debian, Ubuntu, Centos, Suse, …) is Unix. However it is not UNIX. The title for site is miss-leading. (Also Linux is a kernel, not an OS, it can be part of a Unix OS e.g. Gnu/Linux, or a not Unix OS. Gnu is a Unix OS and has many kernels: Linux, Hurd, BSD, cygwin (A MS-Windows dll), LSW (another MS-Windows thing).
– ctrl-alt-delor
Feb 21 at 21:22
@Tim Gnu/Linux (e.g. Debian, Ubuntu, Centos, Suse, …) is Unix. However it is not UNIX. The title for site is miss-leading. (Also Linux is a kernel, not an OS, it can be part of a Unix OS e.g. Gnu/Linux, or a not Unix OS. Gnu is a Unix OS and has many kernels: Linux, Hurd, BSD, cygwin (A MS-Windows dll), LSW (another MS-Windows thing).
– ctrl-alt-delor
Feb 21 at 21:22
It is unclear what context you are asking. What you are saying about mount-point or partition-device is true of the
umount command, but will not be true of all commands.– ctrl-alt-delor
Feb 21 at 21:23
It is unclear what context you are asking. What you are saying about mount-point or partition-device is true of the
umount command, but will not be true of all commands.– ctrl-alt-delor
Feb 21 at 21:23
@ctrl Can you be specific about "What you are saying about mount-point or partition-device is true of the umount command, but will not be true of all commands"? Maybe in a reply?
– Tim
Feb 21 at 21:25
@ctrl Can you be specific about "What you are saying about mount-point or partition-device is true of the umount command, but will not be true of all commands"? Maybe in a reply?
– Tim
Feb 21 at 21:25
|
show 3 more comments
2 Answers
2
active
oldest
votes
You may also specify an unmounted filesystem by its label or by its UUID. You may have entries like “LABEL=foobar” or “UUID=00000000-0000-0000-0000-000000000000” in your /etc/fstab.
As far as I know, that is handled by udev: when it discovers a partition, it reads its UUID and LABEL, and add links to the partition in /dev/disk/by-uuid and /dev/disk/by-label.
The label might contain the mount point, so you can reference the partition by its mount point.
answered Feb 21 at 19:42
user2233709user2233709
1,098412
add a comment |
Let's say it in another way.
How can you specify something? You have to uniquely describe it, at least not causing any confusing. A pathname, without context, you can't actually know what is it refering to, could be simply path ,or the device with its device number, or the device node file or the filesystem stored in the device with its device number.
resize2fs gets a string from you and interpret it as a pathname of a device file and think you want to resize the filesystem lives on the corresponding device.
While other tools or APIs might not use the same assumption. chmod also gets a string from you and interpret it as a pathname of a file, but just change the permission of that inode instead of touching the corresponding device or even the filesystem lives on it. chmod doesn't even care about wether it's a device node or not.
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
add a comment |
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2 Answers
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2 Answers
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You may also specify an unmounted filesystem by its label or by its UUID. You may have entries like “LABEL=foobar” or “UUID=00000000-0000-0000-0000-000000000000” in your /etc/fstab.
As far as I know, that is handled by udev: when it discovers a partition, it reads its UUID and LABEL, and add links to the partition in /dev/disk/by-uuid and /dev/disk/by-label.
The label might contain the mount point, so you can reference the partition by its mount point.
answered Feb 21 at 19:42
user2233709user2233709
1,098412
add a comment |
You may also specify an unmounted filesystem by its label or by its UUID. You may have entries like “LABEL=foobar” or “UUID=00000000-0000-0000-0000-000000000000” in your /etc/fstab.
As far as I know, that is handled by udev: when it discovers a partition, it reads its UUID and LABEL, and add links to the partition in /dev/disk/by-uuid and /dev/disk/by-label.
The label might contain the mount point, so you can reference the partition by its mount point.
answered Feb 21 at 19:42
user2233709user2233709
1,098412
add a comment |
You may also specify an unmounted filesystem by its label or by its UUID. You may have entries like “LABEL=foobar” or “UUID=00000000-0000-0000-0000-000000000000” in your /etc/fstab.
As far as I know, that is handled by udev: when it discovers a partition, it reads its UUID and LABEL, and add links to the partition in /dev/disk/by-uuid and /dev/disk/by-label.
The label might contain the mount point, so you can reference the partition by its mount point.
answered Feb 21 at 19:42
user2233709user2233709
1,098412
You may also specify an unmounted filesystem by its label or by its UUID. You may have entries like “LABEL=foobar” or “UUID=00000000-0000-0000-0000-000000000000” in your /etc/fstab.
As far as I know, that is handled by udev: when it discovers a partition, it reads its UUID and LABEL, and add links to the partition in /dev/disk/by-uuid and /dev/disk/by-label.
The label might contain the mount point, so you can reference the partition by its mount point.
answered Feb 21 at 19:42
user2233709user2233709
1,098412
answered Feb 21 at 19:42
user2233709user2233709
1,098412
answered Feb 21 at 19:42
user2233709user2233709
1,098412
answered Feb 21 at 19:42
user2233709user2233709
1,098412
1,098412
add a comment |
add a comment |
Let's say it in another way.
How can you specify something? You have to uniquely describe it, at least not causing any confusing. A pathname, without context, you can't actually know what is it refering to, could be simply path ,or the device with its device number, or the device node file or the filesystem stored in the device with its device number.
resize2fs gets a string from you and interpret it as a pathname of a device file and think you want to resize the filesystem lives on the corresponding device.
While other tools or APIs might not use the same assumption. chmod also gets a string from you and interpret it as a pathname of a file, but just change the permission of that inode instead of touching the corresponding device or even the filesystem lives on it. chmod doesn't even care about wether it's a device node or not.
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
add a comment |
Let's say it in another way.
How can you specify something? You have to uniquely describe it, at least not causing any confusing. A pathname, without context, you can't actually know what is it refering to, could be simply path ,or the device with its device number, or the device node file or the filesystem stored in the device with its device number.
resize2fs gets a string from you and interpret it as a pathname of a device file and think you want to resize the filesystem lives on the corresponding device.
While other tools or APIs might not use the same assumption. chmod also gets a string from you and interpret it as a pathname of a file, but just change the permission of that inode instead of touching the corresponding device or even the filesystem lives on it. chmod doesn't even care about wether it's a device node or not.
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
add a comment |
Let's say it in another way.
How can you specify something? You have to uniquely describe it, at least not causing any confusing. A pathname, without context, you can't actually know what is it refering to, could be simply path ,or the device with its device number, or the device node file or the filesystem stored in the device with its device number.
resize2fs gets a string from you and interpret it as a pathname of a device file and think you want to resize the filesystem lives on the corresponding device.
While other tools or APIs might not use the same assumption. chmod also gets a string from you and interpret it as a pathname of a file, but just change the permission of that inode instead of touching the corresponding device or even the filesystem lives on it. chmod doesn't even care about wether it's a device node or not.
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
Let's say it in another way.
How can you specify something? You have to uniquely describe it, at least not causing any confusing. A pathname, without context, you can't actually know what is it refering to, could be simply path ,or the device with its device number, or the device node file or the filesystem stored in the device with its device number.
resize2fs gets a string from you and interpret it as a pathname of a device file and think you want to resize the filesystem lives on the corresponding device.
While other tools or APIs might not use the same assumption. chmod also gets a string from you and interpret it as a pathname of a file, but just change the permission of that inode instead of touching the corresponding device or even the filesystem lives on it. chmod doesn't even care about wether it's a device node or not.
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
answered Feb 22 at 5:42
炸鱼薯条德里克炸鱼薯条德里克
5811316
5811316
add a comment |
add a comment |
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What Unix are you referring to? Linux only?
– Kusalananda
Feb 21 at 19:56
I have never used Unix. I am not sure if it is different in Unix.
– Tim
Feb 21 at 20:01
@Tim Gnu/Linux (e.g. Debian, Ubuntu, Centos, Suse, …) is Unix. However it is not UNIX. The title for site is miss-leading. (Also Linux is a kernel, not an OS, it can be part of a Unix OS e.g. Gnu/Linux, or a not Unix OS. Gnu is a Unix OS and has many kernels: Linux, Hurd, BSD, cygwin (A MS-Windows dll), LSW (another MS-Windows thing).
– ctrl-alt-delor
Feb 21 at 21:22
It is unclear what context you are asking. What you are saying about mount-point or partition-device is true of the
umountcommand, but will not be true of all commands.– ctrl-alt-delor
Feb 21 at 21:23
@ctrl Can you be specific about "What you are saying about mount-point or partition-device is true of the umount command, but will not be true of all commands"? Maybe in a reply?
– Tim
Feb 21 at 21:25