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When the last translator box contains a port to a died translator, we do
not want to consider this as a whole failure.
* libfshelp/translator-list.c (fshelp_get_active_translators): On
mach_port_mod_refs failure, reset err to 0.
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Previously, we used the fs protocol to traverse the translator
hierarchies. This, however, is conceptually flawed, because
translators are bound to nodes, and a node can have zero or more links
in the file system. Therefore, the previous method of returning a
list of paths to the client and expecting them to be able to follow
these to reach the child translators was always unreliable.
Fix this by using the fsys protocol to traverse the hierarchy, and
returning the control ports of all children. This is more robust, and
also conceptually cleaner, because the fsys protocol is about
translator linkage, hence this is the point to implement traversal.
Also move the get source routine over. A per-node source really
does not fit the reality of most translators, while a per-translator
source makes sense in many cases.
* hurd/fs.defs (file_get_children): Drop routine.
(file_get_source): Likewise.
* hurd/fsys.defs (fsys_get_children): New routine.
(fsys_get_source): Likewise.
* libdiskfs/Makefile (FSYSSRCS): Remove files, add files.
* libdiskfs/file-get-children.c: Remove file.
* libdiskfs/fsys-get-children.c: New file.
* libdiskfs/file-get-source.c: Remove file.
* libdiskfs/fsys-get-source.c: New file.
* libfshelp/fshelp.h (fshelp_filter): Remove type.
(fshelp_get_active_translators): Remove filter and prefix argument,
return list of control ports.
* libfshelp/translator-list.c (fshelp_get_active_translators):
Likewise.
* libnetfs/Makefile (FSSRCS): Move 'get-source.c' too OTHERSRCS.
(FSYSSRCS): Remove files, add files.
* libnetfs/file-get-children.c: Remove file.
* libnetfs/fsys-get-children.c: New file.
* libnetfs/file-get-source.c: Remove file.
* libnetfs/fsys-get-source.c: New file.
* libtrivfs/Makefile: Move 'get-source.c' too OTHERSRCS.
(FSYSSRCS): Remove files, add files.
* libtrivfs/file-get-children.c: Remove file.
* libtrivfs/fsys-get-children.c: New file.
* libtrivfs/file-get-source.c: Remove file.
* libtrivfs/fsys-get-source.c: Add file.
* trans/Makefile (mtab): Build client stubs until the libc has caught
on.
* trans/mtab.c (target_control): New variable.
(insecure): Drop variable.
(all_translators): Likewise.
(MAX_DEPTH): New macro.
(max_depth): New variable.
(options): Remove '--insecure' and '--all-translators', add '--depth'.
(parse_opt): Adapt accordingly.
(trivsfs_append_args): Likewise.
(main): Get the control port of the target translator, then drop
privileges.
(is_filesystem_translator): Remove function.
(mtab_mark_as_seen): Simplify. Just check if the control port is
known.
(mtab_populate): Limit depth of recursion, adapt to traversing over
the control ports, simplify.
(open_hook): Remove scary comment, it is not applicable anymore
because we no longer dir_lookup child translators.
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Previously, libfshelp used the name of an translator as key in the
hash table. This however is flawed, because a translator is bound to
a node, and a node can have zero or more links in the file system.
Use the nodes address (or rather, the address of the transbox embedded
in the node) as key instead.
* libfshelp/fshelp.h (fshelp_set_active_translator): Instead of the
control port, hand the whole transbox to the function.
* libfshelp/translator-list.c (struct translator): New field 'locp'.
(hash): Hash pointer.
(compare): Compare pointer.
(translator_ihash): Use an location pointer.
(fshelp_set_active_translator): Use the address of the transbox as key.
(fshelp_remove_active_translator): Remove using the location pointer.
* libdiskfs/dir-lookup.c (diskfs_S_dir_lookup): Fix callsite.
* libdiskfs/file-set-trans.c (diskfs_S_file_set_translator): Likewise.
* libnetfs/dir-lookup.c (netfs_S_dir_lookup): Likewise.
* libnetfs/file-set-translator.c (netfs_S_file_set_translator):
Likewise.
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* libfshelp/translator-list.c (fshelp_set_active_translator): Avoid
updating the entry if the control port is still the same.
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* libfshelp/translator-list.c (fshelp_set_active_translator): Free
resources. Assert that an entry is removed.
(fshelp_remove_active_translator): Assert that an entry is removed.
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* libdiskfs/file-syncfs.c (diskfs_S_file_syncfs): Use the new function.
* libdiskfs/fsys-options.c (diskfs_S_fsys_set_options): Likewise.
* libdiskfs/fsys-syncfs.c (diskfs_S_fsys_syncfs): Likewise.
* libdiskfs/shutdown.c (diskfs_shutdown): Likewise.
* libfshelp/fshelp.h (fshelp_map_active_translators): New declaration.
* libfshelp/translator-list.c (fshelp_map_active_translators): New
function.
* libnetfs/file-syncfs.c (netfs_S_file_syncfs): Use the new function.
* libnetfs/fsys-set-options.c (netfs_S_fsys_set_options): Likewise.
* libnetfs/fsys-syncfs.c (netfs_S_fsys_syncfs): Likewise.
* libnetfs/shutdown.c (netfs_shutdown): Likewise.
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* libfshelp/translator-list.c (fshelp_set_active_translator): Always
register dead-name notifications.
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* libfshelp/translator-list.c (fshelp_set_active_translator): Avoid
allocating an entry unless a valid control port is given.
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Use the path names of active translators as keys in the hash table.
* libfshelp/translator-list.c (hash, compare): New functions.
(translator_ihash): Use generalized key interface.
(fshelp_set_active_translator): Update accordingly.
(fshelp_remove_active_translator): Likewise.
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* libfshelp/translator-list.c (translator_ihash_cleanup): Release reference.
(fshelp_set_active_translator): Acquire reference
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* libfshelp/translator-list.c (fshelp_set_active_translator): Use common
out path to unlock translator_ihash_lock before exitting on error.
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When first introduced as fsys_get_children, it made sense to return
the list of children using paths relative to the root of the
filesystem that was queried. Making the get_children method part of
the fsys protocol was a mistake that has since been corrected in
9366d6b2.
Instead of returning paths relative to the root of the translator,
return paths relative to the path of the receiving node.
This fixes a problem with the mtab translator. Previously, the mtab
translator invoked on a target that was not the root directory of a
translator would compute invalid paths, e.g.:
/hurd/mtab: /any/path/servers/socket/26 No such file or directory
* hurd/fs.defs (file_get_children): Update comment.
* libfshelp/translator-list.c (fshelp_get_active_translators): Add
argument PREFIX. Filter entries not beginning with PREFIX if
non-NULL, and omit PREFIX from the returned paths.
* libfshelp/fshelp.h (fshelp_get_active_translators): Update comment
accordingly. Also clarify that both FILTER and PREFIX can be NULL.
* libdiskfs/file-get-children.c (diskfs_S_file_get_children): Update
comment, pass prefix to fshelp_get_active_translators.
* libnetfs/file-get-children.c (netfs_S_file_get_children): Likewise.
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To detect if an active translator goes away, we need to register for
dead name notifications. Those notifications have to be sent to a port
known to the ports library, as the ports library handles the dead name
notifications. The most straight forward way is to use the port to the
underlying node for that. To that end, a reference to the port_info
struct is handed in and kept in the list of active translators.
This commit also moves the registration of dead name notifications to
libfshelp.
* libfshelp/fshelp.h (fshelp_set_active_translator): Add port_info argument.
* libfshelp/translator-list.c (struct translator): Add port_info pointer.
(translator_ihash_cleanup): Dereference port_info object.
(fshelp_set_active_translator): Register dead name notifications.
* libdiskfs/file-set-trans.c (diskfs_S_file_set_translator): Update
accordingly.
* libnetfs/file-set-translator.c (netfs_S_file_set_translator): Likewise.
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Previously the dynamically allocated field name leaks. Fix this by
properly freeing the objects of type struct translator.
* libfshelp/translator-list.c (translator_ihash_cleanup): Fix memory leak.
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* libfshelp/translator-list.c: Include <libgen.h> to get `dirname' prototype.
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Add functions that maintain a list of active translators.
* libfshelp/translator-list.c: New file.
* libfshelp/fshelp.h: Add function declarations.
* libfshelp/Makefile: Add translator-list.c, link against libihash.
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