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Previously, peropen objects were created with a reference count of
zero. Therefore, if diskfs_create_protid fails, passing such an
object to diskfs_release_peropen would lead to a reference count
underflow.
* libdiskfs/peropen-make.c (diskfs_peropen_make): Initialize reference
count to one.
* libdiskfs/protid-make.c (diskfs_start_protid): And consume this
reference on success. Update comment.
(diskfs_create_protid): Update comment.
* libdiskfs/diskfs.h: Update comments.
* libdiskfs/io-duplicate.c (diskfs_S_io_duplicate): Adjust reference
counting accordingly.
* libdiskfs/io-reauthenticate.c (diskfs_S_io_reauthenticate): Likewise.
* libdiskfs/io-restrict-auth.c (diskfs_S_io_restrict_auth): Likewise.
* doc/hurd.texi (Diskfs Internals): Update accordingly.
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* libdiskfs/diskfs.h (struct peropen): Use refcount_t for field refcnt.
* libdiskfs/peropen-make.c (diskfs_make_peropen): Initialize refcnt.
* libdiskfs/peropen-rele.c (diskfs_release_peropen): Adjust accordingly.
* libdiskfs/protid-make.c (diskfs_start_protid): Likewise. Also, the
node must no longer be locked, adjust comment accordingly.
(diskfs_create_protid): Likewise.
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* libdiskfs/peropen-make.c (diskfs_make_peropen): Move `strdup` before port
reference modifications, to fix abortion.
* libnetfs/make-peropen.c (netfs_make_peropen): Check for `malloc` failure.
Move `strdup` before port reference modifications, to fix abortion.
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Track the relative path used to obtain a file handle in the
struct peropen.
* libdiskfs/diskfs.h (struct peropen): New field path.
* libdiskfs/peropen-make.c (diskfs_make_peropen): Initialize path.
* libdiskfs/peropen-rele.c (diskfs_release_peropen): Free path.
* libdiskfs/fsys-getroot.c (diskfs_S_fsys_getroot): Initialize path.
* libdiskfs/dir-lookup.c (diskfs_S_dir_lookup): Preserve the path.
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* peropen-make.c (diskfs_make_peropen): Instead of returning the
peropen, return as error_t and return the peropen in the new
parameter *PPO.
* diskfs.h (diskfs_make_peropen): Change declaration to reflect
new semantics.
* boot-start.c (diskfs_start_bootstrap): Check the return value of
diskfs_make_peropen using the new semantics.
(diskfs_S_exec_startup_get_info): Likewise.
(diskfs_execboot_fsys_startup): Likewise.
(diskfs_S_fsys_init): Likewise.
* dir-lookup.c (diskfs_S_dir_lookup): Likewise.
* dir-mkfile.c (diskfs_S_dir_mkfile): Likewise.
* file-exec.c (diskfs_S_file_exec): Likewise.
* file-reparent.c (diskfs_S_file_reparent): Likewise.
* fsys-getfile.c (diskfs_S_fsys_getfile): Likewise.
* fsys-getroot.c (diskfs_S_fsys_getroot): Likewise.
* trans-callback.c (_diskfs_translator_callback2_fn): Likewise.
* init-startup.c (diskfs_startup_diskfs): Likewise.
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* dir-chg.c (diskfs_S_dir_notice_changes): Check what malloc
returns.
* peropen-make.c (diskfs_make_peropen): Likewise.
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* peropen-make.c (diskfs_make_peropen): If there is no existing
context, then set the shadow_root iff we are a chrooted virtual
root filesystem.
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Initialize the ROOT_PARENT, SHADOW_ROOT, and SHADOW_ROOT_PARENT fields.
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Add & use CONTEXT param.
Remove DOTDOT & DEPTH params.
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Add & use DEPTH argument.
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