[patch 3/3] vfs: make d_path() consistent across mount operations
The path that __d_path() computes can become slightly inconsistent when it races with mount operations: it grabs the vfsmount_lock when traversing mount points but immediately drops it again, only to re-grab it when it reaches the next mount point. The result is that the filename computed is not always consisent, and the file may never have had that name. (This is unlikely, but still possible.) Fix this by grabbing the vfsmount_lock for the whole duration of __d_path(). Signed-off-by: Andreas Gruenbacher <agruen@suse.de> Signed-off-by: John Johansen <jjohansen@suse.de> Signed-off-by: Miklos Szeredi <mszeredi@suse.cz> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
parent
f9f48ec72b
commit
be285c712b
12
fs/dcache.c
12
fs/dcache.c
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@ -1782,6 +1782,7 @@ char *__d_path(const struct path *path, struct path *root,
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char * end = buffer+buflen;
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char * retval;
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spin_lock(&vfsmount_lock);
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prepend(&end, &buflen, "\0", 1);
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if (!IS_ROOT(dentry) && d_unhashed(dentry) &&
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(prepend(&end, &buflen, " (deleted)", 10) != 0))
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@ -1800,14 +1801,11 @@ char *__d_path(const struct path *path, struct path *root,
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break;
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if (dentry == vfsmnt->mnt_root || IS_ROOT(dentry)) {
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/* Global root? */
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spin_lock(&vfsmount_lock);
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if (vfsmnt->mnt_parent == vfsmnt) {
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spin_unlock(&vfsmount_lock);
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goto global_root;
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}
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dentry = vfsmnt->mnt_mountpoint;
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vfsmnt = vfsmnt->mnt_parent;
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spin_unlock(&vfsmount_lock);
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continue;
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}
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parent = dentry->d_parent;
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@ -1820,6 +1818,8 @@ char *__d_path(const struct path *path, struct path *root,
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dentry = parent;
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}
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out:
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spin_unlock(&vfsmount_lock);
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return retval;
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global_root:
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@ -1829,9 +1829,11 @@ global_root:
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goto Elong;
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root->mnt = vfsmnt;
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root->dentry = dentry;
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return retval;
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goto out;
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Elong:
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return ERR_PTR(-ENAMETOOLONG);
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retval = ERR_PTR(-ENAMETOOLONG);
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goto out;
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}
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/**
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