linux.git/fs/d_path.c, branch v6.18.21

fold fs_struct->{lock,seq} into a seqlock

2025-07-08T08:25:19+00:00

	The combination of spinlock_t lock and seqcount_spinlock_t seq
in struct fs_struct is an open-coded seqlock_t (see linux/seqlock_types.h).
	Combine and switch to equivalent seqlock_t primitives.  AFAICS,
that does end up with the same sequence of underlying operations in all
cases.
	While we are at it, get_fs_pwd() is open-coded verbatim in
get_path_from_fd(); rather than applying conversion to it, replace with
the call of get_fs_pwd() there.  Not worth splitting the commit for that,
IMO...

	A bit of historical background - conversion of seqlock_t to
use of seqcount_spinlock_t happened several months after the same
had been done to struct fs_struct; switching fs_struct to seqlock_t
could've been done immediately after that, but it looks like nobody
had gotten around to that until now.

Signed-off-by: Al Viro 
Link: https://lore.kernel.org/20250702053437.GC1880847@ZenIV
Acked-by: Ahmed S. Darwish 
Acked-by: Peter Zijlstra (Intel) 
Reviewed-by: Christian Brauner 
Signed-off-by: Christian Brauner

fs: d_path: include internal.h

2023-05-17T07:16:59+00:00

make W=1 warns about a missing prototype that is defined but
not visible at point where simple_dname() is defined:

fs/d_path.c:317:7: error: no previous prototype for 'simple_dname' [-Werror=missing-prototypes]

Signed-off-by: Arnd Bergmann 
Message-Id: <20230516195444.551461-1-arnd@kernel.org>
Signed-off-by: Christian Brauner

d_path.c: typo fix...

2022-08-20T15:34:33+00:00

Signed-off-by: Al Viro

dynamic_dname(): drop unused dentry argument

2022-08-20T15:34:04+00:00

Signed-off-by: Al Viro

d_path: fix Kernel doc validator complaining

2021-11-06T20:30:32+00:00

Kernel doc validator complains:
  Function parameter or member 'p' not described in 'prepend_name'
  Excess function parameter 'buffer' description in 'prepend_name'

Link: https://lkml.kernel.org/r/20211011005614.26189-1-justin.he@arm.com
Fixes: ad08ae586586 ("d_path: introduce struct prepend_buffer")
Signed-off-by: Jia He 
Reviewed-by: Andy Shevchenko 
Acked-by: Randy Dunlap 
Cc: Al Viro 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

d_path: make 'prepend()' fill up the buffer exactly on overflow

2021-09-02T17:07:29+00:00

Instead of just marking the buffer as having overflowed, fill it up as
much as we can.  That will allow the overflow case to then return
whatever truncated result if it wants to.

Cc: Al Viro 
Signed-off-by: Linus Torvalds

getcwd(2): clean up error handling

2021-05-19T00:15:58+00:00

Signed-off-by: Al Viro

d_path: prepend_path() is unlikely to return non-zero

2021-05-19T00:15:58+00:00

Signed-off-by: Al Viro

d_path: prepend_path(): lift the inner loop into a new helper

2021-05-19T00:15:57+00:00

... and leave the rename_lock/mount_lock handling in prepend_path()
itself

Signed-off-by: Al Viro

d_path: prepend_path(): lift resetting b in case when we'd return 3 out of loop

2021-05-19T00:15:56+00:00

preparation to extracting the loop into helper (next commit)

Signed-off-by: Al Viro