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| author | Amir Goldstein <amir73il@gmail.com> | 2018-03-16 09:39:37 +0100 |
|---|---|---|
| committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-04-12 12:04:50 +0200 |
| commit | 12574a9f4c9cc9d8d6fd9078cbb8ec7d3e9ed46b (patch) | |
| tree | b402f00c36a27b8ce52059adea6925de10929c35 /fs/overlayfs/inode.c | |
| parent | ovl: constant st_ino for non-samefs with xino (diff) | |
| download | linux-12574a9f4c9cc9d8d6fd9078cbb8ec7d3e9ed46b.tar.xz linux-12574a9f4c9cc9d8d6fd9078cbb8ec7d3e9ed46b.zip | |
ovl: consistent i_ino for non-samefs with xino
When overlay layers are not all on the same fs, but all inode numbers
of underlying fs do not use the high 'xino' bits, overlay st_ino values
are constant and persistent.
In that case, set i_ino value to the same value as st_ino for nfsd
readdirplus validator.
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/overlayfs/inode.c')
| -rw-r--r-- | fs/overlayfs/inode.c | 27 |
1 files changed, 18 insertions, 9 deletions
diff --git a/fs/overlayfs/inode.c b/fs/overlayfs/inode.c index 51d780898d89..6e3815fb006b 100644 --- a/fs/overlayfs/inode.c +++ b/fs/overlayfs/inode.c @@ -489,19 +489,26 @@ static inline void ovl_lockdep_annotate_inode_mutex_key(struct inode *inode) } static void ovl_fill_inode(struct inode *inode, umode_t mode, dev_t rdev, - unsigned long ino) + unsigned long ino, int fsid) { + int xinobits = ovl_xino_bits(inode->i_sb); + /* * When NFS export is enabled and d_ino is consistent with st_ino - * (samefs), set the same value to i_ino, because nfsd readdirplus - * compares d_ino values to i_ino values of child entries. When called - * from ovl_new_inode(), ino arg is 0, so i_ino will be updated to real + * (samefs or i_ino has enough bits to encode layer), set the same + * value used for d_ino to i_ino, because nfsd readdirplus compares + * d_ino values to i_ino values of child entries. When called from + * ovl_new_inode(), ino arg is 0, so i_ino will be updated to real * upper inode i_ino on ovl_inode_init() or ovl_inode_update(). */ - if (inode->i_sb->s_export_op && ovl_same_sb(inode->i_sb)) + if (inode->i_sb->s_export_op && + (ovl_same_sb(inode->i_sb) || xinobits)) { inode->i_ino = ino; - else + if (xinobits && fsid && !(ino >> (64 - xinobits))) + inode->i_ino |= (unsigned long)fsid << (64 - xinobits); + } else { inode->i_ino = get_next_ino(); + } inode->i_mode = mode; inode->i_flags |= S_NOCMTIME; #ifdef CONFIG_FS_POSIX_ACL @@ -637,7 +644,7 @@ struct inode *ovl_new_inode(struct super_block *sb, umode_t mode, dev_t rdev) inode = new_inode(sb); if (inode) - ovl_fill_inode(inode, mode, rdev, 0); + ovl_fill_inode(inode, mode, rdev, 0, 0); return inode; } @@ -743,12 +750,14 @@ static bool ovl_hash_bylower(struct super_block *sb, struct dentry *upper, } struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry, - struct dentry *lowerdentry, struct dentry *index, + struct ovl_path *lowerpath, struct dentry *index, unsigned int numlower) { struct inode *realinode = upperdentry ? d_inode(upperdentry) : NULL; struct inode *inode; + struct dentry *lowerdentry = lowerpath ? lowerpath->dentry : NULL; bool bylower = ovl_hash_bylower(sb, upperdentry, lowerdentry, index); + int fsid = bylower ? lowerpath->layer->fsid : 0; bool is_dir; unsigned long ino = 0; @@ -796,7 +805,7 @@ struct inode *ovl_get_inode(struct super_block *sb, struct dentry *upperdentry, if (!inode) goto out_nomem; } - ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino); + ovl_fill_inode(inode, realinode->i_mode, realinode->i_rdev, ino, fsid); ovl_inode_init(inode, upperdentry, lowerdentry); if (upperdentry && ovl_is_impuredir(upperdentry)) |