xfs_iops.c | Explore in Territory

// SPDX-License-Identifier: GPL-2.0
/*
 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
 * All Rights Reserved.
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_inode.h"
#include "xfs_acl.h"
#include "xfs_quota.h"
#include "xfs_da_format.h"
#include "xfs_da_btree.h"
#include "xfs_attr.h"
#include "xfs_trans.h"
#include "xfs_trans_space.h"
#include "xfs_bmap_btree.h"
#include "xfs_trace.h"
#include "xfs_icache.h"
#include "xfs_symlink.h"
#include "xfs_dir2.h"
#include "xfs_iomap.h"
#include "xfs_error.h"
#include "xfs_ioctl.h"
#include "xfs_xattr.h"
#include "xfs_file.h"
#include "xfs_bmap.h"

#include <linux/posix_acl.h>
#include <linux/security.h>
#include <linux/iversion.h>
#include <linux/fiemap.h>

/*
 * Directories have different lock order w.r.t. mmap_lock compared to regular
 * files. This is due to readdir potentially triggering page faults on a user
 * buffer inside filldir(), and this happens with the ilock on the directory
 * held. For regular files, the lock order is the other way around - the
 * mmap_lock is taken during the page fault, and then we lock the ilock to do
 * block mapping. Hence we need a different class for the directory ilock so
 * that lockdep can tell them apart.
 */
static struct lock_class_key xfs_nondir_ilock_class;
static struct lock_class_key xfs_dir_ilock_class;

static int
xfs_initxattrs(
	struct inode		*inode,
	const struct xattr	*xattr_array,
	void			*fs_info)
{ … }

/*
 * Hook in SELinux.  This is not quite correct yet, what we really need
 * here (as we do for default ACLs) is a mechanism by which creation of
 * these attrs can be journalled at inode creation time (along with the
 * inode, of course, such that log replay can't cause these to be lost).
 */
int
xfs_inode_init_security(
	struct inode	*inode,
	struct inode	*dir,
	const struct qstr *qstr)
{ … }

static void
xfs_dentry_to_name(
	struct xfs_name	*namep,
	struct dentry	*dentry)
{ … }

static int
xfs_dentry_mode_to_name(
	struct xfs_name	*namep,
	struct dentry	*dentry,
	int		mode)
{ … }

STATIC void
xfs_cleanup_inode(
	struct inode	*dir,
	struct inode	*inode,
	struct dentry	*dentry)
{ … }

/*
 * Check to see if we are likely to need an extended attribute to be added to
 * the inode we are about to allocate. This allows the attribute fork to be
 * created during the inode allocation, reducing the number of transactions we
 * need to do in this fast path.
 *
 * The security checks are optimistic, but not guaranteed. The two LSMs that
 * require xattrs to be added here (selinux and smack) are also the only two
 * LSMs that add a sb->s_security structure to the superblock. Hence if security
 * is enabled and sb->s_security is set, we have a pretty good idea that we are
 * going to be asked to add a security xattr immediately after allocating the
 * xfs inode and instantiating the VFS inode.
 */
static inline bool
xfs_create_need_xattr(
	struct inode	*dir,
	struct posix_acl *default_acl,
	struct posix_acl *acl)
{ … }


STATIC int
xfs_generic_create(
	struct mnt_idmap	*idmap,
	struct inode		*dir,
	struct dentry		*dentry,
	umode_t			mode,
	dev_t			rdev,
	struct file		*tmpfile)	/* unnamed file */
{ … }

STATIC int
xfs_vn_mknod(
	struct mnt_idmap	*idmap,
	struct inode		*dir,
	struct dentry		*dentry,
	umode_t			mode,
	dev_t			rdev)
{ … }

STATIC int
xfs_vn_create(
	struct mnt_idmap	*idmap,
	struct inode		*dir,
	struct dentry		*dentry,
	umode_t			mode,
	bool			flags)
{ … }

STATIC int
xfs_vn_mkdir(
	struct mnt_idmap	*idmap,
	struct inode		*dir,
	struct dentry		*dentry,
	umode_t			mode)
{ … }

STATIC struct dentry *
xfs_vn_lookup(
	struct inode	*dir,
	struct dentry	*dentry,
	unsigned int flags)
{ … }

STATIC struct dentry *
xfs_vn_ci_lookup(
	struct inode	*dir,
	struct dentry	*dentry,
	unsigned int flags)
{ … }

STATIC int
xfs_vn_link(
	struct dentry	*old_dentry,
	struct inode	*dir,
	struct dentry	*dentry)
{ … }

STATIC int
xfs_vn_unlink(
	struct inode	*dir,
	struct dentry	*dentry)
{ … }

STATIC int
xfs_vn_symlink(
	struct mnt_idmap	*idmap,
	struct inode		*dir,
	struct dentry		*dentry,
	const char		*symname)
{ … }

STATIC int
xfs_vn_rename(
	struct mnt_idmap	*idmap,
	struct inode		*odir,
	struct dentry		*odentry,
	struct inode		*ndir,
	struct dentry		*ndentry,
	unsigned int		flags)
{ … }

/*
 * careful here - this function can get called recursively, so
 * we need to be very careful about how much stack we use.
 * uio is kmalloced for this reason...
 */
STATIC const char *
xfs_vn_get_link(
	struct dentry		*dentry,
	struct inode		*inode,
	struct delayed_call	*done)
{ … }

static uint32_t
xfs_stat_blksize(
	struct xfs_inode	*ip)
{ … }

STATIC int
xfs_vn_getattr(
	struct mnt_idmap	*idmap,
	const struct path	*path,
	struct kstat		*stat,
	u32			request_mask,
	unsigned int		query_flags)
{ … }

static int
xfs_vn_change_ok(
	struct mnt_idmap	*idmap,
	struct dentry		*dentry,
	struct iattr		*iattr)
{ … }

/*
 * Set non-size attributes of an inode.
 *
 * Caution: The caller of this function is responsible for calling
 * setattr_prepare() or otherwise verifying the change is fine.
 */
static int
xfs_setattr_nonsize(
	struct mnt_idmap	*idmap,
	struct dentry		*dentry,
	struct xfs_inode	*ip,
	struct iattr		*iattr)
{ … }

/*
 * Truncate file.  Must have write permission and not be a directory.
 *
 * Caution: The caller of this function is responsible for calling
 * setattr_prepare() or otherwise verifying the change is fine.
 */
STATIC int
xfs_setattr_size(
	struct mnt_idmap	*idmap,
	struct dentry		*dentry,
	struct xfs_inode	*ip,
	struct iattr		*iattr)
{ … }

int
xfs_vn_setattr_size(
	struct mnt_idmap	*idmap,
	struct dentry		*dentry,
	struct iattr		*iattr)
{ … }

STATIC int
xfs_vn_setattr(
	struct mnt_idmap	*idmap,
	struct dentry		*dentry,
	struct iattr		*iattr)
{ … }

STATIC int
xfs_vn_update_time(
	struct inode		*inode,
	int			flags)
{ … }

STATIC int
xfs_vn_fiemap(
	struct inode		*inode,
	struct fiemap_extent_info *fieinfo,
	u64			start,
	u64			length)
{ … }

STATIC int
xfs_vn_tmpfile(
	struct mnt_idmap	*idmap,
	struct inode		*dir,
	struct file		*file,
	umode_t			mode)
{ … }

static const struct inode_operations xfs_inode_operations = …;

static const struct inode_operations xfs_dir_inode_operations = …;

static const struct inode_operations xfs_dir_ci_inode_operations = …;

static const struct inode_operations xfs_symlink_inode_operations = …;

/* Figure out if this file actually supports DAX. */
static bool
xfs_inode_supports_dax(
	struct xfs_inode	*ip)
{ … }

static bool
xfs_inode_should_enable_dax(
	struct xfs_inode *ip)
{ … }

void
xfs_diflags_to_iflags(
	struct xfs_inode	*ip,
	bool init)
{ … }

/*
 * Initialize the Linux inode.
 *
 * When reading existing inodes from disk this is called directly from xfs_iget,
 * when creating a new inode it is called from xfs_init_new_inode after setting
 * up the inode. These callers have different criteria for clearing XFS_INEW, so
 * leave it up to the caller to deal with unlocking the inode appropriately.
 */
void
xfs_setup_inode(
	struct xfs_inode	*ip)
{ … }

void
xfs_setup_iops(
	struct xfs_inode	*ip)
{ … }
linux/fs/xfs/xfs_iops.c
