9a423bb6e3
Support RENAME_NOREPLACE and RENAME_EXCHANGE flags on hostfs if the underlying filesystem supports it. Since renameat2(2) is not yet in any libc, use syscall(2) to invoke the renameat2 syscall. Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Cc: Richard Weinberger <richard@nod.at> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
98 lines
3.3 KiB
C
98 lines
3.3 KiB
C
#ifndef __UM_FS_HOSTFS
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#define __UM_FS_HOSTFS
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#include <os.h>
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/*
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* These are exactly the same definitions as in fs.h, but the names are
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* changed so that this file can be included in both kernel and user files.
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*/
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#define HOSTFS_ATTR_MODE 1
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#define HOSTFS_ATTR_UID 2
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#define HOSTFS_ATTR_GID 4
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#define HOSTFS_ATTR_SIZE 8
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#define HOSTFS_ATTR_ATIME 16
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#define HOSTFS_ATTR_MTIME 32
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#define HOSTFS_ATTR_CTIME 64
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#define HOSTFS_ATTR_ATIME_SET 128
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#define HOSTFS_ATTR_MTIME_SET 256
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/* These two are unused by hostfs. */
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#define HOSTFS_ATTR_FORCE 512 /* Not a change, but a change it */
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#define HOSTFS_ATTR_ATTR_FLAG 1024
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/*
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* If you are very careful, you'll notice that these two are missing:
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*
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* #define ATTR_KILL_SUID 2048
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* #define ATTR_KILL_SGID 4096
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*
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* and this is because they were added in 2.5 development.
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* Actually, they are not needed by most ->setattr() methods - they are set by
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* callers of notify_change() to notify that the setuid/setgid bits must be
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* dropped.
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* notify_change() will delete those flags, make sure attr->ia_valid & ATTR_MODE
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* is on, and remove the appropriate bits from attr->ia_mode (attr is a
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* "struct iattr *"). -BlaisorBlade
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*/
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struct hostfs_iattr {
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unsigned int ia_valid;
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unsigned short ia_mode;
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uid_t ia_uid;
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gid_t ia_gid;
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loff_t ia_size;
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struct timespec ia_atime;
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struct timespec ia_mtime;
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struct timespec ia_ctime;
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};
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struct hostfs_stat {
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unsigned long long ino;
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unsigned int mode;
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unsigned int nlink;
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unsigned int uid;
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unsigned int gid;
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unsigned long long size;
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struct timespec atime, mtime, ctime;
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unsigned int blksize;
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unsigned long long blocks;
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unsigned int maj;
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unsigned int min;
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};
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extern int stat_file(const char *path, struct hostfs_stat *p, int fd);
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extern int access_file(char *path, int r, int w, int x);
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extern int open_file(char *path, int r, int w, int append);
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extern void *open_dir(char *path, int *err_out);
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extern char *read_dir(void *stream, unsigned long long *pos,
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unsigned long long *ino_out, int *len_out,
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unsigned int *type_out);
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extern void close_file(void *stream);
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extern int replace_file(int oldfd, int fd);
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extern void close_dir(void *stream);
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extern int read_file(int fd, unsigned long long *offset, char *buf, int len);
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extern int write_file(int fd, unsigned long long *offset, const char *buf,
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int len);
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extern int lseek_file(int fd, long long offset, int whence);
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extern int fsync_file(int fd, int datasync);
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extern int file_create(char *name, int ur, int uw, int ux, int gr,
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int gw, int gx, int or, int ow, int ox);
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extern int set_attr(const char *file, struct hostfs_iattr *attrs, int fd);
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extern int make_symlink(const char *from, const char *to);
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extern int unlink_file(const char *file);
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extern int do_mkdir(const char *file, int mode);
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extern int do_rmdir(const char *file);
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extern int do_mknod(const char *file, int mode, unsigned int major,
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unsigned int minor);
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extern int link_file(const char *from, const char *to);
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extern int hostfs_do_readlink(char *file, char *buf, int size);
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extern int rename_file(char *from, char *to);
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extern int rename2_file(char *from, char *to, unsigned int flags);
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extern int do_statfs(char *root, long *bsize_out, long long *blocks_out,
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long long *bfree_out, long long *bavail_out,
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long long *files_out, long long *ffree_out,
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void *fsid_out, int fsid_size, long *namelen_out);
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#endif
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