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54be1f6c1c
* Add new dfs_cache.[ch] files * Add new /proc/fs/cifs/dfscache file - dump current cache when read - clear current cache when writing "0" to it * Add delayed_work to periodically refresh cache entries The new interface will be used for caching DFS referrals, as well as supporting client target failover. The DFS cache is a hashtable that maps UNC paths to cache entries. A cache entry contains: - the UNC path it is mapped on - how much the the UNC path the entry consumes - flags - a Time-To-Live after which the entry expires - a list of possible targets (linked lists of UNC paths) - a "hint target" pointing the last known working target or the first target if none were tried. This hint lets cifs.ko remember and try working targets first. * Looking for an entry in the cache is done with dfs_cache_find() - if no valid entries are found, a DFS query is made, stored in the cache and returned - the full target list can be copied and returned to avoid race conditions and looped on with the help with the dfs_cache_tgt_iterator * Updating the target hint to the next target is done with dfs_cache_update_tgthint() These functions have a dfs_cache_noreq_XXX() version that doesn't fetches referrals if no entries are found. These versions don't require the tcp/ses/tcon/cifs_sb parameters as a result. Expired entries cannot be used and since they have a pretty short TTL [1] in order for them to be useful for failover the DFS cache adds a delayed work called periodically to keep them fresh. Since we might not have available connections to issue the referral request when refreshing we need to store volume_info structs with credentials and other needed info to be able to connect to the right server. 1: Windows defaults: 5mn for domain-based referrals, 30mn for regular links Signed-off-by: Paulo Alcantara <palcantara@suse.de> Signed-off-by: Aurelien Aptel <aaptel@suse.com> Signed-off-by: Steve French <stfrench@microsoft.com>
25 lines
797 B
Makefile
25 lines
797 B
Makefile
# SPDX-License-Identifier: GPL-2.0
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#
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# Makefile for Linux CIFS/SMB2/SMB3 VFS client
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#
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ccflags-y += -I$(src) # needed for trace events
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obj-$(CONFIG_CIFS) += cifs.o
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cifs-y := trace.o cifsfs.o cifssmb.o cifs_debug.o connect.o dir.o file.o \
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inode.o link.o misc.o netmisc.o smbencrypt.o transport.o asn1.o \
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cifs_unicode.o nterr.o cifsencrypt.o \
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readdir.o ioctl.o sess.o export.o smb1ops.o winucase.o \
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smb2ops.o smb2maperror.o smb2transport.o \
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smb2misc.o smb2pdu.o smb2inode.o smb2file.o
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cifs-$(CONFIG_CIFS_XATTR) += xattr.o
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cifs-$(CONFIG_CIFS_ACL) += cifsacl.o
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cifs-$(CONFIG_CIFS_UPCALL) += cifs_spnego.o
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cifs-$(CONFIG_CIFS_DFS_UPCALL) += dns_resolve.o cifs_dfs_ref.o dfs_cache.o
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cifs-$(CONFIG_CIFS_FSCACHE) += fscache.o cache.o
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cifs-$(CONFIG_CIFS_SMB_DIRECT) += smbdirect.o
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