linux.git/fs/proc/inode.c, branch v6.6

procfs: convert to ctime accessor functions

2023-07-24T08:30:03+00:00

In later patches, we're going to change how the inode's ctime field is
used. Switch to using accessor functions instead of raw accesses of
inode->i_ctime.

Acked-by: Luis Chamberlain 
Signed-off-by: Jeff Layton 
Reviewed-by: Jan Kara 
Message-Id: <20230705190309.579783-65-jlayton@kernel.org>
Signed-off-by: Christian Brauner

tty, proc, kernfs, random: Use copy_splice_read()

2023-05-24T14:42:16+00:00

Use copy_splice_read() for tty, procfs, kernfs and random files rather
than going through generic_file_splice_read() as they just copy the file
into the output buffer and don't splice pages.  This avoids the need for
them to have a ->read_folio() to satisfy filemap_splice_read().

Signed-off-by: David Howells 
Acked-by: Greg Kroah-Hartman 
cc: Christoph Hellwig 
cc: Jens Axboe 
cc: Al Viro 
cc: John Hubbard 
cc: David Hildenbrand 
cc: Matthew Wilcox 
cc: Miklos Szeredi 
cc: Arnd Bergmann 
cc: linux-block@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
Link: https://lore.kernel.org/r/20230522135018.2742245-13-dhowells@redhat.com
Signed-off-by: Jens Axboe

take care to handle NULL ->proc_lseek()

2022-08-14T19:16:18+00:00

Easily done now, just by clearing FMODE_LSEEK in ->f_mode
during proc_reg_open() for such entries.

Fixes: 868941b14441 "fs: remove no_llseek"
Signed-off-by: Al Viro

proc: add some (hopefully) insightful comments

2022-07-30T01:12:35+00:00

* /proc/${pid}/net status
* removing PDE vs last close stuff (again!)
* random small stuff

Link: https://lkml.kernel.org/r/YtwrM6sDC0OQ53YB@localhost.localdomain
Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton

proc: delete unused includes

2022-07-18T00:31:39+00:00

Those aren't necessary after seq files won.

Link: https://lkml.kernel.org/r/YqnA3mS7KBt8Z4If@localhost.localdomain
Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton

fs: allocate inode by using alloc_inode_sb()

2022-03-22T22:57:03+00:00

The inode allocation is supposed to use alloc_inode_sb(), so convert
kmem_cache_alloc() of all filesystems to alloc_inode_sb().

Link: https://lkml.kernel.org/r/20220228122126.37293-5-songmuchun@bytedance.com
Signed-off-by: Muchun Song 
Acked-by: Theodore Ts'o 		[ext4]
Acked-by: Roman Gushchin 
Cc: Alex Shi 
Cc: Anna Schumaker 
Cc: Chao Yu 
Cc: Dave Chinner 
Cc: Fam Zheng 
Cc: Jaegeuk Kim 
Cc: Johannes Weiner 
Cc: Kari Argillander 
Cc: Matthew Wilcox (Oracle) 
Cc: Michal Hocko 
Cc: Qi Zheng 
Cc: Shakeel Butt 
Cc: Trond Myklebust 
Cc: Vladimir Davydov 
Cc: Vlastimil Babka 
Cc: Wei Yang 
Cc: Xiongchun Duan 
Cc: Yang Shi 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

fs: proc: store PDE()->data into inode->i_private

2022-01-22T06:33:37+00:00

PDE_DATA(inode) is introduced to get user private data and hide the
layout of struct proc_dir_entry.  The inode->i_private is used to do the
same thing as well.  Save a copy of user private data to inode->
i_private when proc inode is allocated.  This means the user also can
get their private data by inode->i_private.

Introduce pde_data() to wrap inode->i_private so that we can remove
PDE_DATA() from fs/proc/generic.c and make PTE_DATE() as a wrapper of
pde_data().  It will be easier if we decide to remove PDE_DATE() in the
future.

Link: https://lkml.kernel.org/r/20211124081956.87711-1-songmuchun@bytedance.com
Signed-off-by: Muchun Song 
Acked-by: Christian Brauner 
Cc: Alexey Dobriyan 
Cc: Alexey Gladkov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: delete redundant subset=pid check

2021-05-07T02:24:11+00:00

Two checks in lookup and readdir code should be enough to not have third
check in open code.

Can't open what can't be looked up?

Link: https://lkml.kernel.org/r/YFYYwIBIkytqnkxP@localhost.localdomain
Signed-off-by: Alexey Dobriyan 
Acked-by: Alexey Gladkov 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: mandate ->proc_lseek in "struct proc_ops"

2021-05-07T02:24:11+00:00

Now that proc_ops are separate from file_operations and other operations
it easy to check all instances to have ->proc_lseek hook and remove check
in main code.

Note:
nonseekable_open() files naturally don't require ->proc_lseek.

Garbage collect pde_lseek() function.

[adobriyan@gmail.com: smoke test lseek()]
  Link: https://lkml.kernel.org/r/YG4OIhChOrVTPgdN@localhost.localdomain

Link: https://lkml.kernel.org/r/YFYX0Bzwxlc7aBa/@localhost.localdomain
Signed-off-by: Alexey Dobriyan 
Signed-off-by: Andrew Morton 
Signed-off-by: Linus Torvalds

proc: wire up generic_file_splice_read for iter ops

2020-11-06T18:05:18+00:00

Wire up generic_file_splice_read for the iter based proxy ops, so
that splice reads from them work.

Signed-off-by: Christoph Hellwig 
Tested-by: Greg Kroah-Hartman 
Signed-off-by: Linus Torvalds