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c33db74b53
freebsd-dev/lib/libc/sys
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Stefan Eßer c33db74b53 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
2023-03-29 08:46:01 +02:00
..
__error.c
__vdso_gettimeofday.c libc binuptime(): use the right function to get the most significant bit index 2022-02-08 21:44:23 +02:00
_exit.2
_umtx_op.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
abort2.2
accept4.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
accept.2
accept.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
access.2 Add AT_EMPTY_PATH for several *at(2) syscalls 2021-04-15 12:48:11 +03:00
acct.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
adjtime.2 Remove references to timed(8) 2021-05-13 09:53:08 +02:00
aio_cancel.2
aio_error.2 Add aio_writev and aio_readv 2021-01-02 19:57:58 -07:00
aio_fsync.2 aio_fsync(2): Support O_DSYNC. 2021-01-08 13:15:56 +13:00
aio_mlock.2
aio_read.2 Add aio_writev and aio_readv 2021-01-02 19:57:58 -07:00
aio_return.2 lio_listio: validate aio_lio_opcode 2021-01-11 19:53:01 -07:00
aio_suspend.2 aio_suspend.2: properly canonicalize .Dd 2020-12-11 00:28:28 +00:00
aio_suspend.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
aio_waitcomplete.2
aio_write.2 Add aio_writev and aio_readv 2021-01-02 19:57:58 -07:00
bind.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
bindat.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
brk.2
brk.c
cap_enter.2 cap_*(2): Document ENOSYS behavior. 2023-03-09 18:10:50 -08:00
cap_fcntls_limit.2 cap_*(2): Document ENOSYS behavior. 2023-03-09 18:10:50 -08:00
cap_ioctls_limit.2 cap_*(2): Document ENOSYS behavior. 2023-03-09 18:10:50 -08:00
cap_rights_limit.2 cap_*(2): Document ENOSYS behavior. 2023-03-09 18:10:50 -08:00
chdir.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
chflags.2 Add AT_EMPTY_PATH for several *at(2) syscalls 2021-04-15 12:48:11 +03:00
chmod.2 Add AT_EMPTY_PATH for several *at(2) syscalls 2021-04-15 12:48:11 +03:00
chown.2 Add AT_EMPTY_PATH for several *at(2) syscalls 2021-04-15 12:48:11 +03:00
chroot.2 chroot.2: Correct grammar errors. 2022-03-31 13:05:49 +11:00
clock_gettime.2 clock_gettime.2: Clarify CLOCK_* 2022-07-08 21:57:24 +02:00
clock_gettime.c
clock_nanosleep.c
close.2
close.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
closefrom.2 fd: add close_range(..., CLOSE_RANGE_CLOEXEC) 2022-03-03 17:21:58 +00:00
closefrom.c closefrom: clamp lowfd to >= 0; close_range's parameters are unsigned. 2020-04-14 23:24:24 +00:00
compat-ino64.h
compat-stub.c
connect.2
connect.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
connectat.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
copy_file_range.2 copy_file_range(2): add recommendation to use large "len" 2021-01-02 17:21:21 -08:00
cpuset_getaffinity.2 Use Linux semantics for the thread affinity syscalls. 2022-05-11 10:36:01 +03:00
cpuset_getdomain.2 cpuset{,_getaffinity,_getdomain}.2: fix SEE ALSO 2020-12-11 01:52:27 +00:00
cpuset.2 cpuset: Fix sched_[g|s]etaffinity() for better compatibility with Linux. 2023-01-29 16:17:33 +03:00
dup.2
eventfd.2 copyright: chase my name and email change 2023-01-06 15:28:42 -05:00
execve.2 execve: disallow argc == 0 2022-01-26 13:40:27 -06:00
extattr_get_file.2 O_PATH: allow vfs_extattr syscalls 2021-10-11 20:09:49 +03:00
fcntl.2 fcntl(2): be more precise about third arg type 2021-12-07 01:27:38 +02:00
fcntl.c libc: drop "All rights reserved" from Foundation copyrights 2022-08-04 16:57:50 -04:00
fdatasync.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
ffclock.2
fhlink.2 [skip ci] document first appearance of fhlink et al 2022-11-30 14:57:56 -07:00
fhopen.2
fhreadlink.2 [skip ci] document first appearance of fhlink et al 2022-11-30 14:57:56 -07:00
flock.2
fork.2 fork(2): comment about doubtful use of stdio and exit(3) in example 2021-08-08 22:38:59 +03:00
fork.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
fspacectl.2 fspacectl(2): Changes on rmsr.r_offset's minimum value returned 2021-08-26 00:03:37 +08:00
fstat.c
fstatat.c
fstatfs.c
fsync.2 libc: drop "All rights reserved" from Foundation copyrights 2022-08-04 16:57:50 -04:00
fsync.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
getdents.c
getdirentries.2 Bump Dd in getdirentries.2 after c6487446. 2022-04-20 17:55:32 +03:00
getdirentries.c
getdtablesize.2
getfh.2 [skip ci] document first appearance of fhlink et al 2022-11-30 14:57:56 -07:00
getfsstat.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
getfsstat.c
getgid.2 libc manpages: various improvements from NetBSD 2020-06-14 05:59:30 +00:00
getgroups.2
getitimer.2 Fix a few mandoc issues 2020-10-09 19:12:44 +00:00
getlogin.2 getlogin_r: fix the type of len 2020-09-09 18:07:13 +00:00
getloginclass.2 Drop "All rights reserved" from all my stuff. This includes 2020-10-28 13:46:11 +00:00
getpeername.2
getpgrp.2
getpid.2
getpriority.2
getrandom.2
getrlimit.2
getrusage.2
getsid.2
getsockname.2
getsockopt.2 getsockopt.2: Clarify the SO_REUSEPORT_LB text a bit 2022-11-02 13:46:24 -04:00
gettimeofday.2 Remove references to timed(8) 2021-05-13 09:53:08 +02:00
gettimeofday.c
getuid.2
interposing_table.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
intro.2 Clarify the description of the EINTEGRITY error in intro(2). 2021-12-28 16:39:46 -08:00
ioctl.2
issetugid.2
jail.2 jail: Change both root and working directories in jail_attach(2) 2021-02-19 14:13:35 -08:00
kenv.2 kenv: allow listing of static kernel environments 2021-07-18 23:06:19 -05:00
kevent.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
kill.2
kldfind.2
kldfirstmod.2
kldload.2
kldnext.2
kldstat.2
kldsym.2
kldunload.2
kqueue.2 kqueue1(2): document 2023-03-28 02:39:26 +03:00
ktrace.2 ktrace.2: Document KTRFAC_STRUCT_ARRAY. 2022-11-02 10:35:26 -07:00
link.2 Fix mistakes in link(2) and shm_open(2) 2021-10-06 06:38:26 +03:00
lio_listio.2 lio_listio(2): Allow LIO_READV and LIO_WRITEV. 2021-08-22 23:00:42 +12:00
listen.2 Revert "listen(): improve POSIX compliance" 2022-10-12 04:33:00 +02:00
lseek.2 lseek(2): Document the seek behavior better and update the POSIX compliance 2020-07-13 15:52:57 +00:00
lstat.c
madvise.2
Makefile.inc kqueue1(2): document 2023-03-28 02:39:26 +03:00
mincore.2 Include the psind in data returned by mincore(2). 2020-09-02 18:16:43 +00:00
minherit.2
mkdir.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
mkfifo.2 Trim some duplicate EIO descriptions. 2020-03-30 21:48:47 +00:00
mknod.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
mknod.c
mlock.2
mlockall.2
mmap.2 mmap(2): Update .Dd missed in the last commit 2020-12-24 14:14:56 +00:00
modfind.2
modnext.2
modstat.2
mount.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
mprotect.2 mprotect.2: Improve the description of prot 2021-09-07 17:28:50 +01:00
mq_close.2
mq_getattr.2
mq_notify.2
mq_open.2 mq_open(2): Fix xref to mq_unlink(2) 2021-03-04 13:32:42 +01:00
mq_receive.2
mq_send.2
mq_setattr.2
mq_unlink.2 mq_unlink(3): Add manual page 2021-02-18 18:56:52 +01:00
msgctl.2 Avoid copying out kernel pointers from msgctl(IPC_STAT). 2020-07-09 17:26:49 +00:00
msgget.2
msgrcv.2
msgsnd.2
msync.2
msync.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
munmap.2
nanosleep.2 libc: Add HISTORY sections to the manual pages 2022-05-05 18:46:32 +02:00
nanosleep.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
nfssvc.2
ntp_adjtime.2
open.2 open.2: describe O_RESOLVE_BENEATH errors correctly 2023-03-02 15:58:00 -05:00
open.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
openat.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
pathconf.2 Fix pathconf.2 documentation error 2021-08-07 07:09:57 +08:00
pdfork.2 libc: Fix most issues reported by mandoc 2020-12-19 14:54:28 +00:00
pdfork.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
pipe.2
pipe.c
poll.2 poll(2): Add POLLRDHUP. 2021-04-28 23:00:31 +12:00
poll.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
POSIX2x_Fork.c libc: drop "All rights reserved" from Foundation copyrights 2022-08-04 16:57:50 -04:00
posix_fadvise.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
posix_fallocate.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
posix_openpt.2
ppoll.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
procctl.2 procctl: actually require debug privileges over target 2021-10-19 23:04:34 +03:00
profil.2 profil(2): profil(II) was in the v3 sources 2023-02-15 12:44:32 -07:00
pselect.2 pselect(2): Document what a null pointer for the signalmask means 2022-07-02 13:41:46 -06:00
pselect.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
ptrace.2 ptrace(2): document PT_SC_REMOTE 2022-12-22 23:11:42 +02:00
ptrace.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
quotactl.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
rctl_add_rule.2
read.2 Revert "Add extra EINVAL information about wrong block size to read(2)/write(2)" 2022-10-08 10:23:51 +00:00
read.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
readlink.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
readv.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
reboot.2 kern_reboot(9): some updates 2023-03-20 17:12:12 -03:00
recv.2 recv: bump manpage date after be1f485d7d. 2022-08-02 13:24:14 +00:00
recvfrom.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
recvmsg.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
rename.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
revoke.2 libc: Fix most issues reported by mandoc 2020-12-19 14:54:28 +00:00
rfork.2
rmdir.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
rtprio.2 Add idle priority scheduling privilege group to MAC/priority 2021-12-10 04:54:48 +02:00
sched_get_priority_max.2
sched_setparam.2
sched_setscheduler.2
sched_yield.2
sctp_generic_recvmsg.2
sctp_generic_sendmsg.2
sctp_peeloff.2
select.2 man page of select(2) should mention pselect(2) 2020-06-25 12:31:05 +00:00
select.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
semctl.2 Apply the logic from r363051 to semctl(2) and __sem_base field. 2020-07-09 18:34:54 +00:00
semget.2
semop.2
send.2 Document handling of connection-mode sockets by sendto(2). 2020-04-27 16:12:32 +00:00
sendfile.2 libc: Fix most issues reported by mandoc 2020-12-19 14:54:28 +00:00
sendmsg.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
sendto.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
setcontext.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
setfib.2
setgroups.2
setpgid.2
setregid.2
setresuid.2
setreuid.2
setsid.2
setuid.2
shm_open.2 shm: Document shm_create_largepage() 2023-02-03 11:48:25 -05:00
shm_open.c Fix error checking in shm_create_largepage(). 2020-09-18 12:30:15 +00:00
shmat.2
shmctl.2
shmget.2
shutdown.2
sigaction.2 [skip ci] document close_range(2) as async-signal-safe 2020-07-21 16:46:40 +00:00
sigaction.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
sigaltstack.2
sigfastblock.2
sigpending.2
sigprocmask.2
sigprocmask.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
sigqueue.2
sigreturn.2
sigstack.2
sigsuspend.2
sigsuspend.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
sigtimedwait.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
sigwait.2
sigwait.c
sigwaitinfo.2 Fix sigtimedwait manpage. 2022-04-21 10:52:29 +03:00
sigwaitinfo.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
socket.2 man: add Netlink reference to socket(2) 2023-01-15 11:27:43 +00:00
socketpair.2
stat.2 Add AT_EMPTY_PATH for several *at(2) syscalls 2021-04-15 12:48:11 +03:00
stat.c
statfs.2 fs/msdosfs: add tracking of free root directory entries 2023-03-29 08:46:01 +02:00
statfs.c
swapcontext.c libc: partially revert r326576 2020-04-25 14:24:54 +00:00
swapon.2 Document new variant of swapoff(2) 2021-12-09 02:48:53 +02:00
Symbol.map kqueue1(2): export the symbol from libc 2023-03-28 02:39:26 +03:00
symlink.2 Trim some duplicate EIO descriptions. 2020-03-30 21:48:47 +00:00
sync.2
sysarch.2
syscall.2
thr_exit.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
thr_kill.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
thr_new.2 Change sysctl section to 3 as suggested by Benjamin Kaduk. 2022-09-17 09:35:49 +02:00
thr_self.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
thr_set_name.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
thr_suspend.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
thr_wake.2 Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
timer_create.2
timer_delete.2
timer_settime.2
trivial-vdso_tc.c
truncate.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
umask.2
undelete.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
unlink.2 open(2): Remove O_BENEATH and AT_BENEATH 2021-03-02 20:16:55 +02:00
utimensat.2 utimensat(2): Remove description of compatibility code 2022-06-12 22:57:31 +02:00
utimes.2 Document EINTEGRITY errors for many system calls. 2020-03-30 21:44:00 +00:00
utrace.2
uuidgen.2
vadvise.c
vfork.2
wait4.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
wait6.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
wait.2 wait.2: Remove sys/types.h from the list of required headers 2022-06-30 10:31:26 -04:00
write.2 Revert "Add extra EINVAL information about wrong block size to read(2)/write(2)" 2022-10-08 10:23:51 +00:00
write.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00
writev.c Remove "All Rights Reserved" from FreeBSD Foundation libc copyrights 2022-07-21 09:53:31 -04:00