From: Tobin C. Harding Date: Wed, 15 May 2019 00:29:12 +0000 (+1000) Subject: docs: filesystems: vfs: Convert spaces to tabs X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=1b44ae63deae020e172866871bd14a76376e0f8b;p=openwrt%2Fstaging%2Fblogic.git 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 Signed-off-by: Jonathan Corbet --- diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt index 9ed5c8d6e656..4f4f4931bfa0 100644 --- a/Documentation/filesystems/vfs.txt +++ b/Documentation/filesystems/vfs.txt @@ -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 *); - - 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 *); - - 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); + 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 *); + + 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); 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.