5822b7faca
This patch allows hostfs_setattr() to work on unlinked open files by calling set_attr() (the userspace part) with the inode's fd. Without this, applications that depend on doing attribute changes to unlinked open files will fail. It works by using the fd versions instead of the path ones (for example fchmod() instead of chmod(), fchown() instead of chown()) when an fd is available. Signed-off-by: Alberto Bertogli <albertito@gmail.com> Signed-off-by: Jeff Dike <jdike@linux.intel.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
101 lines
3.8 KiB
C
101 lines
3.8 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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/* 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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/* 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 in this patch:
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*
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* http://linux.bkbits.net:8080/linux-2.5/
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* cset@3caf4a12k4XgDzK7wyK-TGpSZ9u2Ww?nav=index.html
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* |src/.|src/include|src/include/linux|related/include/linux/fs.h
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*
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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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mode_t 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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extern int stat_file(const char *path, unsigned long long *inode_out,
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int *mode_out, int *nlink_out, int *uid_out, int *gid_out,
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unsigned long long *size_out, struct timespec *atime_out,
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struct timespec *mtime_out, struct timespec *ctime_out,
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int *blksize_out, unsigned long long *blocks_out, 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 int file_type(const char *path, int *maj, int *min);
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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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extern void close_file(void *stream);
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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, unsigned int minor);
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extern int link_file(const char *from, const char *to);
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extern int 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 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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long *spare_out);
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#endif
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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