ext2fs: add read-write support for Extended Attributes.

Extended attributes and their particular implementation in linux are
different from FreeBSD so in this case we have started diverging from
the

ext2fs: add read-write support for Extended Attributes.

Extended attributes and their particular implementation in linux are
different from FreeBSD so in this case we have started diverging from
the UFS EA implementation, which would be the natural reference.

Depending on future progress implementing ACLs this approach may change
but for now bring to the tree an implementation that is consistent and
can be tested.

Submitted by: Fedor Uporov

Differential Revision: https://reviews.freebsd.org/D10460

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Merge ^/head r313644 through r313895.

prefix UFS symbols with UFS_ to reduce namespace pollution

Specifically:
ROOTINO -> UFS_ROOTINO
WINO -> UFS_WINO
NXADDR -> UFS_NXADDR
NDADDR -> UFS_NDADDR
NIADDR -> UFS_NIADDR
MAXSYMLINK

prefix UFS symbols with UFS_ to reduce namespace pollution

Specifically:
ROOTINO -> UFS_ROOTINO
WINO -> UFS_WINO
NXADDR -> UFS_NXADDR
NDADDR -> UFS_NDADDR
NIADDR -> UFS_NIADDR
MAXSYMLINKLEN_UFS[12] -> UFS[12]_MAXSYMLINKLEN (for consistency)

Also prefix ext2's and nandfs's NDADDR and NIADDR with EXT2_ and NANDFS_

Reviewed by: kib, mckusick
Obtained from: NetBSD
MFC after: 1 month
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D9536

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style(9) cleanups.

Just to reduce some of the issues found with indent(1).

MFC after: 1 week

Merge ^/head r309263 through r309518.

ext2fs: renumber the license clauses to avoid skipping #3.

This is to keep consistency with other files, and help license-checking
utilities determine the number of clauses that apply.

No functiona

ext2fs: renumber the license clauses to avoid skipping #3.

This is to keep consistency with other files, and help license-checking
utilities determine the number of clauses that apply.

No functional change.

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fs/ext2fs: spelling fixes on comment.

No functional change.

Merge sync of head

Merge ^/head r277327 through r277718.

MFhead @ r277403

Reintegrate head: r274132-r277384

Sponsored by: The FreeBSD Foundation

Fix the build when INVARIANTS is defined by restoring `bo`'s definition in
ext2_truncate(..) and by putting it under INVARIANTS ifdefs

X-MFC with: r277354
MFC after: 2 weeks

ext2: Garbage-collect some unused variables

Reported by: clang static analysis
MFC after: 2 weeks

Reintegrate head revisions r273096-r277147

Sponsored by: The FreeBSD Foundation

Merge ^/head r274961 through r275684.

MFhead @ r275663

ext2fs: Fix old out-of-bounds access.

Overrunning buffer pointed to by (caddr_t)&oip->i_db[0] of 48 bytes by
passing it to a function which accesses it at byte offset 59 using
argument 60UL.

The is

ext2fs: Fix old out-of-bounds access.

Overrunning buffer pointed to by (caddr_t)&oip->i_db[0] of 48 bytes by
passing it to a function which accesses it at byte offset 59 using
argument 60UL.

The issue was inherited from an older FFS implementation and
fixed there with by merging UFS2 in r98542. We follow the
FFS fix.

Discussed with: bde
CID: 1007665
MFC after: 3 days

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MFC @ r266724

An SVM update will follow this.

Merge head

IFC @264767

Merge head up to r263906.

ext2fs: use of tab vs spaces.

Consistently use a single tab after a #define as mentioned in style(9).
Use tabs instead of space for indenting.
Fix a typo: "hash_vesion".

No functional change.

MFC

ext2fs: use of tab vs spaces.

Consistently use a single tab after a #define as mentioned in style(9).
Use tabs instead of space for indenting.
Fix a typo: "hash_vesion".

No functional change.

MFC after: 3 days

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Merge head r233826 through r256722.

IFC @256277

Approved by: ken (mentor)

IFC @ r255692

Comment out IA32_MISC_ENABLE MSR access - this doesn't exist on AMD.
Need to sort out how arch-specific MSRs will be handled.