mirror of
https://github.com/FEX-Emu/linux.git
synced 2025-01-10 11:30:49 +00:00
docs: filesystems: vfs: Convert spaces to tabs
There are bunch of places with 8 spaces, in preparation for correctly indenting all code snippets (during conversion to RST) change these to use tabspaces. This patch is whitespace only. Convert instances of 8 consecutive spaces to a single tabspace. Signed-off-by: Tobin C. Harding <tobin@kernel.org> Signed-off-by: Jonathan Corbet <corbet@lwn.net>
This commit is contained in:
Tobin C. Harding
Jonathan Corbet
parent
e66b045715
commit
1b44ae63de
@ -111,12 +111,12 @@ members are defined:
|
||||
struct file_system_type {
|
||||
const char *name;
|
||||
int fs_flags;
|
||||
struct dentry *(*mount) (struct file_system_type *, int,
|
||||
const char *, void *);
|
||||
void (*kill_sb) (struct super_block *);
|
||||
struct module *owner;
|
||||
struct file_system_type * next;
|
||||
struct list_head fs_supers;
|
||||
struct dentry *(*mount) (struct file_system_type *, int,
|
||||
const char *, void *);
|
||||
void (*kill_sb) (struct super_block *);
|
||||
struct module *owner;
|
||||
struct file_system_type * next;
|
||||
struct list_head fs_supers;
|
||||
struct lock_class_key s_lock_key;
|
||||
struct lock_class_key s_umount_key;
|
||||
};
|
||||
@ -205,26 +205,26 @@ This describes how the VFS can manipulate the superblock of your
|
||||
filesystem. As of kernel 2.6.22, the following members are defined:
|
||||
|
||||
struct super_operations {
|
||||
struct inode *(*alloc_inode)(struct super_block *sb);
|
||||
void (*destroy_inode)(struct inode *);
|
||||
struct inode *(*alloc_inode)(struct super_block *sb);
|
||||
void (*destroy_inode)(struct inode *);
|
||||
|
||||
void (*dirty_inode) (struct inode *, int flags);
|
||||
int (*write_inode) (struct inode *, int);
|
||||
void (*drop_inode) (struct inode *);
|
||||
void (*delete_inode) (struct inode *);
|
||||
void (*put_super) (struct super_block *);
|
||||
int (*sync_fs)(struct super_block *sb, int wait);
|
||||
int (*freeze_fs) (struct super_block *);
|
||||
int (*unfreeze_fs) (struct super_block *);
|
||||
int (*statfs) (struct dentry *, struct kstatfs *);
|
||||
int (*remount_fs) (struct super_block *, int *, char *);
|
||||
void (*clear_inode) (struct inode *);
|
||||
void (*umount_begin) (struct super_block *);
|
||||
void (*dirty_inode) (struct inode *, int flags);
|
||||
int (*write_inode) (struct inode *, int);
|
||||
void (*drop_inode) (struct inode *);
|
||||
void (*delete_inode) (struct inode *);
|
||||
void (*put_super) (struct super_block *);
|
||||
int (*sync_fs)(struct super_block *sb, int wait);
|
||||
int (*freeze_fs) (struct super_block *);
|
||||
int (*unfreeze_fs) (struct super_block *);
|
||||
int (*statfs) (struct dentry *, struct kstatfs *);
|
||||
int (*remount_fs) (struct super_block *, int *, char *);
|
||||
void (*clear_inode) (struct inode *);
|
||||
void (*umount_begin) (struct super_block *);
|
||||
|
||||
int (*show_options)(struct seq_file *, struct dentry *);
|
||||
int (*show_options)(struct seq_file *, struct dentry *);
|
||||
|
||||
ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
|
||||
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
|
||||
ssize_t (*quota_read)(struct super_block *, int, char *, size_t, loff_t);
|
||||
ssize_t (*quota_write)(struct super_block *, int, const char *, size_t, loff_t);
|
||||
int (*nr_cached_objects)(struct super_block *);
|
||||
void (*free_cached_objects)(struct super_block *, int);
|
||||
};
|
||||
@ -479,7 +479,7 @@ otherwise noted.
|
||||
filesystem.
|
||||
|
||||
May be called in rcu-walk mode (mask & MAY_NOT_BLOCK). If in rcu-walk
|
||||
mode, the filesystem must check the permission without blocking or
|
||||
mode, the filesystem must check the permission without blocking or
|
||||
storing to the inode.
|
||||
|
||||
If a situation is encountered that rcu-walk cannot handle, return
|
||||
@ -698,12 +698,12 @@ struct address_space_operations {
|
||||
tagged as DIRTY and will pass them to ->writepage.
|
||||
|
||||
set_page_dirty: called by the VM to set a page dirty.
|
||||
This is particularly needed if an address space attaches
|
||||
private data to a page, and that data needs to be updated when
|
||||
a page is dirtied. This is called, for example, when a memory
|
||||
This is particularly needed if an address space attaches
|
||||
private data to a page, and that data needs to be updated when
|
||||
a page is dirtied. This is called, for example, when a memory
|
||||
mapped page gets modified.
|
||||
If defined, it should set the PageDirty flag, and the
|
||||
PAGECACHE_TAG_DIRTY tag in the radix tree.
|
||||
PAGECACHE_TAG_DIRTY tag in the radix tree.
|
||||
|
||||
readpages: called by the VM to read pages associated with the address_space
|
||||
object. This is essentially just a vector version of
|
||||
@ -721,7 +721,7 @@ struct address_space_operations {
|
||||
storage, then those blocks should be pre-read (if they haven't been
|
||||
read already) so that the updated blocks can be written out properly.
|
||||
|
||||
The filesystem must return the locked pagecache page for the specified
|
||||
The filesystem must return the locked pagecache page for the specified
|
||||
offset, in *pagep, for the caller to write into.
|
||||
|
||||
It must be able to cope with short writes (where the length passed to
|
||||
@ -730,21 +730,21 @@ struct address_space_operations {
|
||||
flags is a field for AOP_FLAG_xxx flags, described in
|
||||
include/linux/fs.h.
|
||||
|
||||
A void * may be returned in fsdata, which then gets passed into
|
||||
write_end.
|
||||
A void * may be returned in fsdata, which then gets passed into
|
||||
write_end.
|
||||
|
||||
Returns 0 on success; < 0 on failure (which is the error code), in
|
||||
Returns 0 on success; < 0 on failure (which is the error code), in
|
||||
which case write_end is not called.
|
||||
|
||||
write_end: After a successful write_begin, and data copy, write_end must
|
||||
be called. len is the original len passed to write_begin, and copied
|
||||
is the amount that was able to be copied.
|
||||
be called. len is the original len passed to write_begin, and copied
|
||||
is the amount that was able to be copied.
|
||||
|
||||
The filesystem must take care of unlocking the page and releasing it
|
||||
refcount, and updating i_size.
|
||||
The filesystem must take care of unlocking the page and releasing it
|
||||
refcount, and updating i_size.
|
||||
|
||||
Returns < 0 on failure, otherwise the number of bytes (<= 'copied')
|
||||
that were able to be copied into pagecache.
|
||||
Returns < 0 on failure, otherwise the number of bytes (<= 'copied')
|
||||
that were able to be copied into pagecache.
|
||||
|
||||
bmap: called by the VFS to map a logical block offset within object to
|
||||
physical block number. This method is used by the FIBMAP
|
||||
@ -755,7 +755,7 @@ struct address_space_operations {
|
||||
are and uses those addresses directly.
|
||||
|
||||
invalidatepage: If a page has PagePrivate set, then invalidatepage
|
||||
will be called when part or all of the page is to be removed
|
||||
will be called when part or all of the page is to be removed
|
||||
from the address space. This generally corresponds to either a
|
||||
truncation, punch hole or a complete invalidation of the address
|
||||
space (in the latter case 'offset' will always be 0 and 'length'
|
||||
@ -767,47 +767,47 @@ struct address_space_operations {
|
||||
release MUST succeed.
|
||||
|
||||
releasepage: releasepage is called on PagePrivate pages to indicate
|
||||
that the page should be freed if possible. ->releasepage
|
||||
should remove any private data from the page and clear the
|
||||
PagePrivate flag. If releasepage() fails for some reason, it must
|
||||
that the page should be freed if possible. ->releasepage
|
||||
should remove any private data from the page and clear the
|
||||
PagePrivate flag. If releasepage() fails for some reason, it must
|
||||
indicate failure with a 0 return value.
|
||||
releasepage() is used in two distinct though related cases. The
|
||||
first is when the VM finds a clean page with no active users and
|
||||
wants to make it a free page. If ->releasepage succeeds, the
|
||||
page will be removed from the address_space and become free.
|
||||
wants to make it a free page. If ->releasepage succeeds, the
|
||||
page will be removed from the address_space and become free.
|
||||
|
||||
The second case is when a request has been made to invalidate
|
||||
some or all pages in an address_space. This can happen
|
||||
through the fadvise(POSIX_FADV_DONTNEED) system call or by the
|
||||
filesystem explicitly requesting it as nfs and 9fs do (when
|
||||
they believe the cache may be out of date with storage) by
|
||||
calling invalidate_inode_pages2().
|
||||
some or all pages in an address_space. This can happen
|
||||
through the fadvise(POSIX_FADV_DONTNEED) system call or by the
|
||||
filesystem explicitly requesting it as nfs and 9fs do (when
|
||||
they believe the cache may be out of date with storage) by
|
||||
calling invalidate_inode_pages2().
|
||||
If the filesystem makes such a call, and needs to be certain
|
||||
that all pages are invalidated, then its releasepage will
|
||||
need to ensure this. Possibly it can clear the PageUptodate
|
||||
bit if it cannot free private data yet.
|
||||
that all pages are invalidated, then its releasepage will
|
||||
need to ensure this. Possibly it can clear the PageUptodate
|
||||
bit if it cannot free private data yet.
|
||||
|
||||
freepage: freepage is called once the page is no longer visible in
|
||||
the page cache in order to allow the cleanup of any private
|
||||
the page cache in order to allow the cleanup of any private
|
||||
data. Since it may be called by the memory reclaimer, it
|
||||
should not assume that the original address_space mapping still
|
||||
exists, and it should not block.
|
||||
|
||||
direct_IO: called by the generic read/write routines to perform
|
||||
direct_IO - that is IO requests which bypass the page cache
|
||||
and transfer data directly between the storage and the
|
||||
application's address space.
|
||||
direct_IO - that is IO requests which bypass the page cache
|
||||
and transfer data directly between the storage and the
|
||||
application's address space.
|
||||
|
||||
isolate_page: Called by the VM when isolating a movable non-lru page.
|
||||
If page is successfully isolated, VM marks the page as PG_isolated
|
||||
via __SetPageIsolated.
|
||||
|
||||
migrate_page: This is used to compact the physical memory usage.
|
||||
If the VM wants to relocate a page (maybe off a memory card
|
||||
that is signalling imminent failure) it will pass a new page
|
||||
If the VM wants to relocate a page (maybe off a memory card
|
||||
that is signalling imminent failure) it will pass a new page
|
||||
and an old page to this function. migrate_page should
|
||||
transfer any private data across and update any references
|
||||
that it has to the page.
|
||||
that it has to the page.
|
||||
|
||||
putback_page: Called by the VM when isolated page's migration fails.
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user