df(1): Fix grammar

Event: Advance UNIX programming course (Fall'23) at NTHU
Pull Request: https://github.com/freebsd/freebsd-src/pull/1027

df(1): fix a typo

On the manpage of df(1), "according" is mistyped into "acccording"

Event: Advanced UNIX Programming Course (Fall'23) at NTHU.
Signed-off-by: Pin-Yi Kuo <kuokuoyiyi@gapp.nthu.edu.t

df(1): fix a typo

On the manpage of df(1), "according" is mistyped into "acccording"

Event: Advanced UNIX Programming Course (Fall'23) at NTHU.
Signed-off-by: Pin-Yi Kuo <kuokuoyiyi@gapp.nthu.edu.tw>
Reviewed by: imp, zlei, Mina Galić
Pull Request: https://github.com/freebsd/freebsd-src/pull/944

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bin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl s

bin: Remove ancient SCCS tags.

Remove ancient SCCS tags from the tree, automated scripting, with two
minor fixup to keep things compiling. All the common forms in the tree
were removed with a perl script.

Sponsored by: Netflix

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Remove $FreeBSD$: one-line nroff pattern

Remove /^\.\\"\s*\$FreeBSD\$$\n/

fs/msdosfs: add tracking of free root directory entries

This update implements tallying of free directory entries during
create, delete, or rename operations on FAT12 and FAT16 file systems.

Prior

fs/msdosfs: add tracking of free root directory entries

This update implements tallying of free directory entries during
create, delete, or rename operations on FAT12 and FAT16 file systems.

Prior to this change, the total number of root directory entries
was reported as number of inodes, but 0 as the number of free
inodes, causing system health monitoring software to warn about
a suspected disk full issue.

The FAT12 and FAT16 file systems provide a limited number of
root directory entries, e.g. 512 on typical hard disk formats.
The valid range of values is 1 to 65535, but the msdosfs code
will effectively round up "odd" values to the next multiple of 16
(e.g. 513 would allow for 528 root directory entries).

This update implements tracking of directory entries during create,
delete, or rename operations, with initial values determined by
scanning the directory when the file system is mounted.

Total and free directory entries are reported in the f_files and
f_ffree elements of struct statfs, despite differences in semantics
of these values:

- There is no limit on the number of files and directories that can
be created on a FAT file system. Only the root directory of FAT12
and FAT16 file systems is limited, any number of files can still be
created in sub-directories, even when 0 free "inodes" are reported.

- A single file can require 1 to 21 directory entries, depending on
the character set, structure, and length of the name. The DOS 8.3
style file name takes up 1 entry, and if the name does not comply
with the syntax of a DOS 8.3 file name, 1 additional entry is used
for each 13 characters of the file name. Since all these entries
have to be contiguous, it is possible that a file or directory with
a long name can not be created, despite a sufficient total number of
free directory entries.

- Renaming a file can require more directory entries than currently
allocated to store its long name, which may prevent an in-place
update of the name if more entries are needed. This may cause a
rename operation to fail if no contiguous range of free entries for
the new name can be found.

- The volume label is stored in a directory entry. An empty FAT file
system with a volume label will therefore show 1 used "inode" in
df.

- The perceentage of free inodes shown in df or monitoring tools does
only represent the state of the root directory of a FAT12 or FAT16
file system. Neither does a reported value of 0% free inodes does
prevent files from being created in sub-directories, nor does a
value of 50% free inodes guarantee that even a single file with
a "long" name can be created in the root directory (if every other
directory entry is occupied and there are no 2 contiguous entries).

The statfs(2) and df(1) man pages have been updated with a notice
regarding the possibly different semantics of values reported as
total and free inodes for non-Unix file systems.

PR: 270053
Reported by: Ben Woods <woodsb02@freebsd.org>
Approved by: mckusick
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D38987

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df: do not report a 100% full inode usage on fs without inodes

Before:
devfs 2 2 0 100% 0 0 100% /dev

After:
devfs 2 2 0 100% 0

df: do not report a 100% full inode usage on fs without inodes

Before:
devfs 2 2 0 100% 0 0 100% /dev

After:
devfs 2 2 0 100% 0 0 - /dev

The previous behaviour was confusing for end users and many monitoring tools

Note the linux df tools is also using the same syntax '-' for such filesystem

MFC After: 2 weeks
Reviewed by: manu, emaste, imp
Differential Revision: https://reviews.freebsd.org/D34515

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bin/df: allow -t option to be used together with -l

The df command provides a -l option to exclude all non-local file
systems and a -t option with a (positive or negative) list of file
system types

bin/df: allow -t option to be used together with -l

The df command provides a -l option to exclude all non-local file
systems and a -t option with a (positive or negative) list of file
system types to display.

This commit adds support for a combination of -l and -t. If both are
specified, the parameter list of the -t option is applied on top of
the selection of öocal file systems (independently of the order of
the -l and -t options).

E.g., "df -t noprocfs,sysfs -l" will select all local file systems
except those of type procfs and sysfs.

PR: 260921
Approved by: imp
Relnotes: yes
MFC after: 1 month
Differential Revision: https://reviews.freebsd.org/D33748

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Remove the unnecessary space before the colon

MFC after: 3 days

df: Remove support for mounting devices

This was marked deprecated in r329092, over two and a half years ago.
This functionality is also buggy per PR 237368.

PR: 237368
Reviewed by: brooks, cem, e

df: Remove support for mounting devices

This was marked deprecated in r329092, over two and a half years ago.
This functionality is also buggy per PR 237368.

PR: 237368
Reviewed by: brooks, cem, emaste, imp
Differential Revision: https://reviews.freebsd.org/D27197

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df(1): Add EXAMPLES section to man page

* Add EXAMPLES section with four simple examples.
* Simplify -H flag description. This makes easy to see the difference between
this flag and -h
* While her

df(1): Add EXAMPLES section to man page

* Add EXAMPLES section with four simple examples.
* Simplify -H flag description. This makes easy to see the difference between
this flag and -h
* While here, fix .Tn deprecated macro.

Approved by: manpages (bcr@)
Differential Revision: https://reviews.freebsd.org/D26662

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MFhead@r322451

Merge ^/head r321383 through r322397.

df(1): Add --si as an alias for -H

Reviewed by: cem (earlier version), emaste
Approved by: emaste (mentor)
Differential Revision: https://reviews.freebsd.org/D11749

Merge ^/head r314420 through r314481.

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is

Renumber copyright clause 4

Renumber cluase 4 to 3, per what everybody else did when BSD granted
them permission to remove clause 3. My insistance on keeping the same
numbering for legal reasons is too pedantic, so give up on that point.

Submitted by: Jan Schaumann <jschauma@stevens.edu>
Pull Request: https://github.com/freebsd/freebsd/pull/96

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MFH r289384-r293170

Sponsored by: The FreeBSD Foundation

Catch up with head.

Add more text to explain --libxo flag.

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Merge from head@274682

Sync to HEAD@r274297.

Document that df(1) supports libxo(3).

MFC @ r266724

An SVM update will follow this.

Merge head