Quelle fileattr.h Sprache: C

/* SPDX-License-Identifier: GPL-2.0 */

#ifndef _LINUX_FILEATTR_H
#define _LINUX_FILEATTR_H

/* Flags shared betwen flags/xflags */
#define FS_COMMON_FL \
(FS_SYNC_FL | FS_IMMUTABLE_FL | FS_APPEND_FL | \
  FS_NODUMP_FL | FS_NOATIME_FL | FS_DAX_FL | \
  FS_PROJINHERIT_FL)

#define FS_XFLAG_COMMON \
(FS_XFLAG_SYNC | FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND | \
  FS_XFLAG_NODUMP | FS_XFLAG_NOATIME | FS_XFLAG_DAX | \
  FS_XFLAG_PROJINHERIT)

/* Read-only inode flags */
#define FS_XFLAG_RDONLY_MASK \
(FS_XFLAG_PREALLOC | FS_XFLAG_HASATTR)

/* Flags to indicate valid value of fsx_ fields */
#define FS_XFLAG_VALUES_MASK \
(FS_XFLAG_EXTSIZE | FS_XFLAG_COWEXTSIZE)

/* Flags for directories */
#define FS_XFLAG_DIRONLY_MASK \
(FS_XFLAG_RTINHERIT | FS_XFLAG_NOSYMLINKS | FS_XFLAG_EXTSZINHERIT)

/* Misc settable flags */
#define FS_XFLAG_MISC_MASK \
(FS_XFLAG_REALTIME | FS_XFLAG_NODEFRAG | FS_XFLAG_FILESTREAM)

#define FS_XFLAGS_MASK \
(FS_XFLAG_COMMON | FS_XFLAG_RDONLY_MASK | FS_XFLAG_VALUES_MASK | \
  FS_XFLAG_DIRONLY_MASK | FS_XFLAG_MISC_MASK)

/*
* Merged interface for miscellaneous file attributes.  'flags' originates from
* ext* and 'fsx_flags' from xfs.  There's some overlap between the two, which
* is handled by the VFS helpers, so filesystems are free to implement just one
* or both of these sub-interfaces.
*/
struct file_kattr {
u32 flags;  /* flags (FS_IOC_GETFLAGS/FS_IOC_SETFLAGS) */
/* struct fsxattr: */
u32 fsx_xflags; /* xflags field value (get/set) */
u32 fsx_extsize; /* extsize field value (get/set)*/
u32 fsx_nextents; /* nextents field value (get) */
u32 fsx_projid; /* project identifier (get/set) */
u32 fsx_cowextsize; /* CoW extsize field value (get/set)*/
/* selectors: */
bool flags_valid:1;
bool fsx_valid:1;
};

int copy_fsxattr_to_user(const struct file_kattr *fa, struct fsxattr __user *ufa);

void fileattr_fill_xflags(struct file_kattr *fa, u32 xflags);
void fileattr_fill_flags(struct file_kattr *fa, u32 flags);

/**
* fileattr_has_fsx - check for extended flags/attributes
* @fa: fileattr pointer
*
* Return: true if any attributes are present that are not represented in
* ->flags.
*/
static inline bool fileattr_has_fsx(const struct file_kattr *fa)
{
return fa->fsx_valid &&
  ((fa->fsx_xflags & ~FS_XFLAG_COMMON) || fa->fsx_extsize != 0 ||
   fa->fsx_projid != 0 || fa->fsx_cowextsize != 0);
}

int vfs_fileattr_get(struct dentry *dentry, struct file_kattr *fa);
int vfs_fileattr_set(struct mnt_idmap *idmap, struct dentry *dentry,
       struct file_kattr *fa);
int ioctl_getflags(struct file *file, unsigned int __user *argp);
int ioctl_setflags(struct file *file, unsigned int __user *argp);
int ioctl_fsgetxattr(struct file *file, void __user *argp);
int ioctl_fssetxattr(struct file *file, void __user *argp);

#endif /* _LINUX_FILEATTR_H */

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