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highmem: Rename put_and_unmap_page() to unmap_and_put_page()

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With commit 849ad04cf5 ("new helper: put_and_unmap_page()"), Al Viro
introduced the put_and_unmap_page() to use in those many places where we
have a common pattern consisting of calls to kunmap_local() +
put_page().

Obviously, first we unmap and then we put pages. Instead, the original
name of this helper seems to imply that we first put and then unmap.

Therefore, rename the helper and change the only known upstreamed user
(i.e., fs/sysv) before this helper enters common use and might become
difficult to find all call sites and instead easy to break the builds.

Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Fabio M. De Francesco <fmdefrancesco@gmail.com>
Reviewed-by: Eric Biggers <ebiggers@google.com>
Message-Id: <20230602103307.5637-1-fmdefrancesco@gmail.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Fabio M. De Francesco 2023-06-02 12:33:07 +02:00 committed by Christian Brauner
parent 79aa284946
commit d0e135408e
3 changed files with 16 additions and 16 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

22
fs/sysv/dir.c
View File

@ -52,7 +52,7 @@ static int sysv_handle_dirsync(struct inode *dir)
}
/*
* Calls to dir_get_page()/put_and_unmap_page() must be nested according to the
* Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
* rules documented in mm/highmem.rst.
*
* NOTE: sysv_find_entry() and sysv_dotdot() act as calls to dir_get_page()
@ -103,11 +103,11 @@ static int sysv_readdir(struct file *file, struct dir_context *ctx)
if (!dir_emit(ctx, name, strnlen(name,SYSV_NAMELEN),
fs16_to_cpu(SYSV_SB(sb), de->inode),
DT_UNKNOWN)) {
put_and_unmap_page(page, kaddr);
unmap_and_put_page(page, kaddr);
return 0;
}
}
put_and_unmap_page(page, kaddr);
unmap_and_put_page(page, kaddr);
}
return 0;
}
@ -131,7 +131,7 @@ static inline int namecompare(int len, int maxlen,
* itself (as a parameter - res_dir). It does NOT read the inode of the
* entry - you'll have to do that yourself if you want to.
*
* On Success put_and_unmap_page() should be called on *res_page.
* On Success unmap_and_put_page() should be called on *res_page.
*
* sysv_find_entry() acts as a call to dir_get_page() and must be treated
* accordingly for nesting purposes.
@ -166,7 +166,7 @@ struct sysv_dir_entry *sysv_find_entry(struct dentry *dentry, struct page **res_
name, de->name))
goto found;
}
put_and_unmap_page(page, kaddr);
unmap_and_put_page(page, kaddr);
}
if (++n >= npages)
@ -209,7 +209,7 @@ int sysv_add_link(struct dentry *dentry, struct inode *inode)
goto out_page;
de++;
}
put_and_unmap_page(page, kaddr);
unmap_and_put_page(page, kaddr);
}
BUG();
return -EINVAL;
@ -228,7 +228,7 @@ got_it:
mark_inode_dirty(dir);
err = sysv_handle_dirsync(dir);
out_page:
put_and_unmap_page(page, kaddr);
unmap_and_put_page(page, kaddr);
return err;
out_unlock:
unlock_page(page);
@ -321,12 +321,12 @@ int sysv_empty_dir(struct inode * inode)
if (de->name[1] != '.' || de->name[2])
goto not_empty;
}
put_and_unmap_page(page, kaddr);
unmap_and_put_page(page, kaddr);
}
return 1;
not_empty:
put_and_unmap_page(page, kaddr);
unmap_and_put_page(page, kaddr);
return 0;
}
@ -352,7 +352,7 @@ int sysv_set_link(struct sysv_dir_entry *de, struct page *page,
}
/*
* Calls to dir_get_page()/put_and_unmap_page() must be nested according to the
* Calls to dir_get_page()/unmap_and_put_page() must be nested according to the
* rules documented in mm/highmem.rst.
*
* sysv_dotdot() acts as a call to dir_get_page() and must be treated
@ -376,7 +376,7 @@ ino_t sysv_inode_by_name(struct dentry *dentry)
if (de) {
res = fs16_to_cpu(SYSV_SB(dentry->d_sb), de->inode);
put_and_unmap_page(page, de);
unmap_and_put_page(page, de);
}
return res;
}

8
fs/sysv/namei.c
View File

@ -164,7 +164,7 @@ static int sysv_unlink(struct inode * dir, struct dentry * dentry)
inode->i_ctime = dir->i_ctime;
inode_dec_link_count(inode);
}
put_and_unmap_page(page, de);
unmap_and_put_page(page, de);
return err;
}
@ -227,7 +227,7 @@ static int sysv_rename(struct mnt_idmap *idmap, struct inode *old_dir,
if (!new_de)
goto out_dir;
err = sysv_set_link(new_de, new_page, old_inode);
put_and_unmap_page(new_page, new_de);
unmap_and_put_page(new_page, new_de);
if (err)
goto out_dir;
new_inode->i_ctime = current_time(new_inode);
@ -256,9 +256,9 @@ static int sysv_rename(struct mnt_idmap *idmap, struct inode *old_dir,
out_dir:
if (dir_de)
put_and_unmap_page(dir_page, dir_de);
unmap_and_put_page(dir_page, dir_de);
out_old:
put_and_unmap_page(old_page, old_de);
unmap_and_put_page(old_page, old_de);
out:
return err;
}

2
include/linux/highmem.h
View File

@ -507,7 +507,7 @@ static inline void folio_zero_range(struct folio *folio,
zero_user_segments(&folio->page, start, start + length, 0, 0);
}
static inline void put_and_unmap_page(struct page *page, void *addr)
static inline void unmap_and_put_page(struct page *page, void *addr)
{
kunmap_local(addr);
put_page(page);