ANDROID: sdcardfs: Add sdcardfs filesystem

Bug: 11118565
Bug: 27915347
Bug: 27992761
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Bug: 78262592
Bug: 111641492
Bug: 111642636
Bug: 111860541
Bug: 120446149
Change-Id: Ic1e01e602ce335d97342be54f3da0c5c65c087cc
Signed-off-by: Daniel Rosenberg <drosen@google.com>
[astrachan: Folded the following changes into this patch:
            903cea7ab0b2 ("ANDROID: Included sdcardfs source code for kernel 3.0")
            612a725e3d97 ("ANDROID: Port of sdcardfs to 4.4")
            e4187c55208b ("ANDROID: Changed type-casting in packagelist management")
            cf76072a5cd8 ("ANDROID: sdcardfs: Bring up to date with Android M permissions:")
            a43aa502c608 ("ANDROID: sdcardfs: Add support for d_canonical_path")
            d8fefbf85af2 ("ANDROID: sdcardfs: remove effectless config option")
            416677409336 ("ANDROID: sdcardfs: Remove unused code")
            8e49a570d351 ("ANDROID: sdcardfs: remove unneeded __init and __exit")
            40ee0e93f1d7 ("ANDROID: sdcardfs: Truncate packages_gid.list on overflow")
            b1d9602aa3fe ("ANDROID: sdcardfs: fix itnull.cocci warnings")
            60a177f5a167 ("ANDROID: sdcardfs: override umask on mkdir and create")
            efb3d2695203 ("ANDROID: sdcardfs: Check for other cases on path lookup")
            0da87f63666f ("ANDROID: sdcardfs: Fix locking for permission fix up")
            75b93060655e ("ANDROID: sdcardfs: Switch package list to RCU")
            657b0a00f497 ("ANDROID: sdcardfs: Added top to sdcardfs_inode_info")
            5008d91cba25 ("ANDROID: sdcardfs: fix external storage exporting incorrect uid")
            e06c452d0d07 ("ANDROID: sdcardfs: Move directory unlock before touch")
            72e5443a2816 ("ANDROID: sdcardfs: User new permission2 functions")
            ae8be7da556d ("ANDROID: sdcardfs: Add gid and mask to private mount data")
            151a3efe57a6 ("ANDROID: sdcardfs: Use per mount permissions")
            cff865a370f3 ("ANDROID: sdcardfs: Switch ->d_inode to d_inode()")
            065ac66804bf ("ANDROID: sdcardfs: Fix locking issue with permision fix up")
            31ea603eb3c4 ("ANDROID: sdcardfs: use wrappers to access i_mutex")
            c25c2f5018a2 ("ANDROID: sdcardfs: add parent pointer into dentry name hash")
            58616bb4ec68 ("ANDROID: sdcardfs: get rid of 'parent' argument of ->d_compare()")
            1654d7ffdd20 ("ANDROID: sdcardfs: Propagate dentry down to inode_change_ok()")
            39335cac1d2f ("ANDROID: sdcardfs: make it use new .rename i_op")
            7622bb3fcc79 ("ANDROID: sdcardfs: eliminate the offset argument to ->direct_IO")
            843bd7295ee0 ("ANDROID: sdcardfs: Allow non-owners to touch")
            e3d74804d174 ("ANDROID: sdcardfs: Refactor configfs interface")
            5833eda87a72 ("ANDROID: sdcardfs: add support for user permission isolation")
            d83fb1f41dd4 ("ANDROID: sdcardfs: Remove redundant operation")
            8767af17c0e5 ("ANDROID: sdcardfs: Add GID Derivation to sdcardfs")
            7119d96ad3ee ("ANDROID: sdcardfs: switch to full_name_hash and qstr")
            778e02a54859 ("ANDROID: sdcardfs: Switch strcasecmp for internal call")
            cd4965d04404 ("ANDROID: sdcardfs: Fix incorrect hash")
            40a2ee053505 ("ANDROID: sdcardfs: Add missing path_put")
            da5342bac57a ("ANDROID: sdcardfs: Don't bother deleting freelist")
            c91857b01e05 ("ANDROID: sdcardfs: implement vm_ops->page_mkwrite")
            f62b3906044b ("ANDROID: sdcardfs: support direct-IO (DIO) operations")
            c2e216d36d63 ("ANDROID: sdcardfs: Fix case insensitive lookup")
            57b92ab6f774 ("ANDROID: sdcardfs: rate limit warning print")
            8534cee39a81 ("ANDROID: sdcardfs: Replace get/put with d_lock")
            156085b2fccf ("ANDROID: sdcardfs: Use spin_lock_nested")
            8a260cabac4e ("ANDROID: sdcardfs: Switch to internal case insensitive compare")
            a8d51569573c ("ANDROID: sdcardfs: Use d_invalidate instead of drop_recurisve")
            932a6071de63 ("ANDROID: sdcardfs: Get the blocksize from the lower fs")
            0ad4c0f87527 ("ANDROID: sdcardfs: declare MODULE_ALIAS_FS")
            b97c83b5b683 ("ANDROID: sdcardfs: Use case insensitive hash function")
            9920dfb08265 ("ANDROID: sdcardfs: move path_put outside of spinlock")
            f9a25348b233 ("ANDROID: sdcardfs: Remove uninformative prints")
            720d9030bea1 ("ANDROID: sdcardfs: Fix gid issue")
            4cbb7fa6e66c ("ANDROID: sdcardfs: correct order of descriptors")
            6cff6cc301ed ("ANDROID: sdcardfs: Fix formatting")
            ac2a40412e26 ("ANDROID: sdcardfs: Fix style issues with comments")
            2212bb8ec064 ("ANDROID: sdcardfs: remove unneeded null check")
            4c1a0add8d21 ("ANDROID: sdcardfs: Use pr_[...] instead of printk")
            74535fe211ac ("ANDROID: sdcardfs: Use to kstrout")
            e6cf8dffd014 ("ANDROID: sdcardfs: Use seq_puts over seq_printf")
            2b1ac93a90b6 ("ANDROID: sdcardfs: Fix style issues in macros")
            bab6d117426f ("ANDROID: sdcardfs: remove unnecessary call to do_munmap")
            1c0bf09f19b6 ("ANDROID: sdcardfs: copy lower inode attributes in ->ioctl")
            42f3db55942b ("ANDROID: sdcardfs: fix ->llseek to update upper and lower offset")
            97ad6205055e ("ANDROID: sdcardfs: add read_iter/write_iter opeations")
            be9abc81332b ("ANDROID: sdcardfs: use d_splice_alias")
            4e90114cb1b4 ("ANDROID: sdcardfs: update module info")
            0e1f7ab14924 ("ANDROID: sdcardfs: Directly pass lower file for mmap")
            28be4beb43f9 ("ANDROID: sdcardfs: Change cache GID value")
            9fc2c452aefe ("ANDROID: sdcardfs: ->iget fixes")
            9bb72cf15cbc ("ANDROID: sdcardfs: Don't do d_add for lower fs")
            1bc21a04c11b ("ANDROID: sdcardfs: Don't complain in fixup_lower_ownership")
            0fb5b10b28a9 ("ANDROID: sdcardfs: Use filesystem specific hash")
            30e2f0aadce2 ("ANDROID: sdcardfs: Copy meta-data from lower inode")
            f748c7053194 ("ANDROID: sdcardfs: Avoid setting GIDs outside of valid ranges")
            3d38f08bacdb ("ANDROID: sdcardfs: Call lower fs's revalidate")
            2d1f1c203978 ("ANDROID: sdcardfs: Don't iput if we didn't igrab")
            857fc5e717fc ("ANDROID: sdcardfs: fix sdcardfs_destroy_inode for the inode RCU approach")
            4fceeccf1d23 ("ANDROID: sdcardfs: Move top to its own struct")
            f51470044a15 ("ANDROID: sdcardfs: Check for NULL in revalidate")
            8c7f6c97ac81 ("ANDROID: sdcardfs: d_splice_alias can return error values")
            17da01b37d61 ("ANDROID: sdcardfs: remove dead function open_flags_to_access_mode()")
            16662dd604be ("ANDROID: sdcardfs: use mount_nodev and fix a issue in sdcardfs_kill_sb")
            43c0dca6039a ("ANDROID: sdcardfs: Remove unnecessary lock")
            48960c25cdc1 ("ANDROID: sdcardfs: override credential for ioctl to lower fs")
            5d6410b9a88d ("ANDROID: Sdcardfs: Move gid derivation under flag")
            c7dd98431f83 ("ANDROID: sdcardfs: Add default_normal option")
            db9bf31a5d86 ("ANDROID: sdcardfs: port to 4.14")
            c70c9d1e82d2 ("ANDROID: sdcardfs: Use lower getattr times/size")
            04e961477d62 ("ANDROID: sdcardfs: Protect set_top")
            1ed04b79d281 ("ANDROID: sdcardfs: Hold i_mutex for i_size_write")
            77f52fc10982 ("ANDROID: sdcardfs: Set num in extension_details during make_item")
            d71596efa247 ("ANDROID: sdcardfs: fix lock issue on 32 bit/SMP architectures")
            ee6b07fced4a ("ANDROID: sdcardfs: Fix sdcardfs to stop creating cases-sensitive duplicate entries.")
            ce12807d5b75 ("ANDROID: sdcardfs: Check for private data earlier")
            c080450304cd ("ANDROID: sdcardfs: d_make_root calls iput")
            900e77796781 ("ANDROID: sdcardfs: Set s_root to NULL after putting")
            49092e89ffa4 ("ANDROID: sdcardfs: Don't d_drop in d_revalidate")
            e1f978bc9b9c ("ANDROID: sdcardfs: fix potential crash when reserved_mb is not zero")
            faa148eaf8ed ("ANDROID: sdcardfs: Check stacked filesystem depth")
            6edd721e972c ("ANDROID: sdcardfs: Don't use OVERRIDE_CRED macro")
            11ca578b4336 ("ANDROID: sdcardfs: Change current->fs under lock")
            83dea6ba6ea7 ("ANDROID: sdcardfs: Use inode iversion helpers")
            12064f3a794e ("ANDROID: sdcardfs: Add option to drop unused dentries")
            d9fe221bbf84 ("ANDROID: sdcardfs: Add sandbox")
            f544ad0b1547 ("ANDROID: sdcardfs: Add option to not link obb")]
Signed-off-by: Alistair Strachan <astrachan@google.com>
diff --git a/fs/Makefile b/fs/Makefile
index 293733f..110241a 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -84,6 +84,7 @@
 obj-$(CONFIG_HFSPLUS_FS)	+= hfsplus/ # Before hfs to find wrapped HFS+
 obj-$(CONFIG_HFS_FS)		+= hfs/
 obj-$(CONFIG_ECRYPT_FS)		+= ecryptfs/
+obj-$(CONFIG_SDCARD_FS)		+= sdcardfs/
 obj-$(CONFIG_VXFS_FS)		+= freevxfs/
 obj-$(CONFIG_NFS_FS)		+= nfs/
 obj-$(CONFIG_EXPORTFS)		+= exportfs/