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Initial implementation of statfs reply, just returning the filesystem type and its id.
* netfs.c: Include <sys/statvfs.h> and <unistd.h>.
(netfs_attempt_statfs): Implement.
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* dircat.c, dircat.h, main.c, main.h, netfs.c, process.c, process.h,
procfs.c, procfs.h, procfs_dir.c, procfs_dir.h, proclist.c,
proclist.h, rootdir.c, rootdir.h: Add copyright notices.
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This is necessary for top, for instance, which keeps some files open and
re-reads them regularly. As an extra bonus we can drop the refresh hack.
* procfs.c, procfs.h: Remove the refresh hack.
(procfs_refresh): New function, invalidates the cached contents.
* netfs.c (netfs_attempt_read, netfs_get_dirents): Call
procfs_refresh when the read is from offset 0.
* proclist.c (proclist_make_node): Remove the refresh hack.
* dircat.c (dircat_make_node): Likewise.
(dircat_get_contents): Use procfs_refresh to avoid keeping old data
from the component nodes.
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* procfs.h: Make CONTENTS_LEN an ssize_t rather than a size_t,
and document the change.
* procfs.c (procfs_get_contents): Initialize CONTENTS_LEN to a
negative value, and fail with ENOMEM if it's still negative after the
callback returns. (everywhere): Update to ssize_t.
* dircat.c, netfs.c, process.c,
procfs_dir.c, proclist.c, rootdir.c: Update to
ssize_t and the new GET_CONTENTS semantics.
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* procfs.h (procfs_cleanup_contents_with_free,
procfs_cleanup_contents_with_vm_deallocate, procfs_get_contents,
struct procfs_ops): Change CONTENTS from a void pointer to a char one.
* dircat.c, netfs.c, process.c, procfs.c,
procfs_dir.c, proclist.c, rootdir.c: Update.
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* netfs.c (netfs_validate_stat): For symlinks, fetch the contents
and propagate their length into the nn_stat.st_size field.
(netfs_attempt_readlink): Implement using procfs_get_contents.
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* netfs.c (netfs_node_norefs): Handle the reference counters
spinlock so as to avoid deadlocking on reentry.
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* procfs.c (procfs_lookup): Keep track of the parent directory,
implement the lookup of the dot-directories. (procfs_cleanup):
Release the reference to the parent node, if applicable.
* procfs.h: Add a comment about the parent reference.
* netfs.c (netfs_attempt_lookup): Lock the looked up node after
the directory has been unlocked, in case they are the same.
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* procfs.h: New file; basic interfaces for procfs nodes.
* procfs.c: New file; implement the basic infrastructure.
* netfs.c: New file; bridge libnetfs and the procfs interfaces.
* main.c: New file; mostly a "Hello, World!" for now.
* Makefile: New file; standalone for now.
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