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21cb47be6f
The inode_owner_or_capable() helper determines whether the caller is the owner of the inode or is capable with respect to that inode. Allow it to handle idmapped mounts. If the inode is accessed through an idmapped mount it according to the mount's user namespace. Afterwards the checks are identical to non-idmapped mounts. If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Similarly, allow the inode_init_owner() helper to handle idmapped mounts. It initializes a new inode on idmapped mounts by mapping the fsuid and fsgid of the caller from the mount's user namespace. If the initial user namespace is passed nothing changes so non-idmapped mounts will see identical behavior as before. Link: https://lore.kernel.org/r/20210121131959.646623-7-christian.brauner@ubuntu.com Cc: Christoph Hellwig <hch@lst.de> Cc: David Howells <dhowells@redhat.com> Cc: Al Viro <viro@zeniv.linux.org.uk> Cc: linux-fsdevel@vger.kernel.org Reviewed-by: Christoph Hellwig <hch@lst.de> Reviewed-by: James Morris <jamorris@linux.microsoft.com> Signed-off-by: Christian Brauner <christian.brauner@ubuntu.com>
140 lines
3.5 KiB
C
140 lines
3.5 KiB
C
/*
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* ialloc.c
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*
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* PURPOSE
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* Inode allocation handling routines for the OSTA-UDF(tm) filesystem.
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*
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* COPYRIGHT
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* This file is distributed under the terms of the GNU General Public
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* License (GPL). Copies of the GPL can be obtained from:
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* ftp://prep.ai.mit.edu/pub/gnu/GPL
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* Each contributing author retains all rights to their own work.
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*
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* (C) 1998-2001 Ben Fennema
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*
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* HISTORY
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*
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* 02/24/99 blf Created.
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*
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*/
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#include "udfdecl.h"
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#include <linux/fs.h>
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#include <linux/sched.h>
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#include <linux/slab.h>
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#include "udf_i.h"
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#include "udf_sb.h"
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void udf_free_inode(struct inode *inode)
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{
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struct super_block *sb = inode->i_sb;
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struct udf_sb_info *sbi = UDF_SB(sb);
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struct logicalVolIntegrityDescImpUse *lvidiu = udf_sb_lvidiu(sb);
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if (lvidiu) {
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mutex_lock(&sbi->s_alloc_mutex);
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if (S_ISDIR(inode->i_mode))
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le32_add_cpu(&lvidiu->numDirs, -1);
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else
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le32_add_cpu(&lvidiu->numFiles, -1);
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udf_updated_lvid(sb);
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mutex_unlock(&sbi->s_alloc_mutex);
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}
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udf_free_blocks(sb, NULL, &UDF_I(inode)->i_location, 0, 1);
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}
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struct inode *udf_new_inode(struct inode *dir, umode_t mode)
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{
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struct super_block *sb = dir->i_sb;
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struct udf_sb_info *sbi = UDF_SB(sb);
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struct inode *inode;
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udf_pblk_t block;
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uint32_t start = UDF_I(dir)->i_location.logicalBlockNum;
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struct udf_inode_info *iinfo;
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struct udf_inode_info *dinfo = UDF_I(dir);
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struct logicalVolIntegrityDescImpUse *lvidiu;
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int err;
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inode = new_inode(sb);
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if (!inode)
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return ERR_PTR(-ENOMEM);
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iinfo = UDF_I(inode);
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if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_EXTENDED_FE)) {
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iinfo->i_efe = 1;
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if (UDF_VERS_USE_EXTENDED_FE > sbi->s_udfrev)
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sbi->s_udfrev = UDF_VERS_USE_EXTENDED_FE;
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iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
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sizeof(struct extendedFileEntry),
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GFP_KERNEL);
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} else {
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iinfo->i_efe = 0;
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iinfo->i_data = kzalloc(inode->i_sb->s_blocksize -
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sizeof(struct fileEntry),
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GFP_KERNEL);
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}
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if (!iinfo->i_data) {
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iput(inode);
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return ERR_PTR(-ENOMEM);
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}
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err = -ENOSPC;
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block = udf_new_block(dir->i_sb, NULL,
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dinfo->i_location.partitionReferenceNum,
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start, &err);
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if (err) {
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iput(inode);
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return ERR_PTR(err);
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}
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lvidiu = udf_sb_lvidiu(sb);
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if (lvidiu) {
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iinfo->i_unique = lvid_get_unique_id(sb);
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inode->i_generation = iinfo->i_unique;
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mutex_lock(&sbi->s_alloc_mutex);
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if (S_ISDIR(mode))
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le32_add_cpu(&lvidiu->numDirs, 1);
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else
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le32_add_cpu(&lvidiu->numFiles, 1);
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udf_updated_lvid(sb);
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mutex_unlock(&sbi->s_alloc_mutex);
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}
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inode_init_owner(&init_user_ns, inode, dir, mode);
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET))
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inode->i_uid = sbi->s_uid;
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if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET))
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inode->i_gid = sbi->s_gid;
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iinfo->i_location.logicalBlockNum = block;
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iinfo->i_location.partitionReferenceNum =
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dinfo->i_location.partitionReferenceNum;
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inode->i_ino = udf_get_lb_pblock(sb, &iinfo->i_location, 0);
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inode->i_blocks = 0;
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iinfo->i_lenEAttr = 0;
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iinfo->i_lenAlloc = 0;
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iinfo->i_use = 0;
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iinfo->i_checkpoint = 1;
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iinfo->i_extraPerms = FE_PERM_U_CHATTR;
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udf_update_extra_perms(inode, mode);
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if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_AD_IN_ICB))
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iinfo->i_alloc_type = ICBTAG_FLAG_AD_IN_ICB;
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else if (UDF_QUERY_FLAG(inode->i_sb, UDF_FLAG_USE_SHORT_AD))
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iinfo->i_alloc_type = ICBTAG_FLAG_AD_SHORT;
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else
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iinfo->i_alloc_type = ICBTAG_FLAG_AD_LONG;
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inode->i_mtime = inode->i_atime = inode->i_ctime = current_time(inode);
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iinfo->i_crtime = inode->i_mtime;
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if (unlikely(insert_inode_locked(inode) < 0)) {
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make_bad_inode(inode);
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iput(inode);
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return ERR_PTR(-EIO);
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}
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mark_inode_dirty(inode);
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return inode;
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}
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